How To Replace Subaru Leaking Headgaskets SOHC EJ25
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- เผยแพร่เมื่อ 22 ก.พ. 2018
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In this how to video we cover off how to remove your Subaru 2.5L EJ25 SOHC Impreza Forester Legacy Outback cylinder heads and replace the leaking headgaskets and make sure the timing is correct.
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Replacing the head stud bolts is a very debated topic but according to Subaru's service information, it does not specify new head bolts as part of a head gasket repair job. But it does state that the final tightening of these bolts must not exceed the specified number of degrees for each step. Doing so could cause one of these bolts to reach its yield point, possibly permanently stretching and damaging it.
There is more information here: mdhmotors.com/what-are-torque-to-yield-head-bolts/
Really you should always inspect your bolts and holes and use your discretion. If there's any doubt, replace the bolts.
Speed Academy n
Depending on the manufacturer and application, torquing to yield could mean just dipping into elastic deformation, or going straight into plastic deformation territory, on one-time-use applications. I believe Subaru has a length specification for the head bolts; if stretched beyond that distance, it's been stretched to the point of plastic deformation and absolutely must be replaced. Personally, I always replace any TTY bolts that are this much work to get to, just to be on the safe side, unless I have a length spec from the manufacturer and can verify they're still short enough with my micrometer. In any case, I would be very hesitant to reuse head bolts more than two or maybe three times on an engine that's prone to blowing head gaskets.
Speed Academy Could you help me out with something. My 2010 outback doesn't show the typical signs of a bad head gasket, no white steam out of the exhaust, no bubbles in coolant. It acts like a bad thermostat, won't circulate the coolant, cold lower rad hose, hot upper hose, blow coolant everywhere once it heats up, I replaced the thermostat, the water pump and the radiator, no luck. I'm trying not to except that the head gaskets are bad, in your expert opinion on subys, are my head gaskets bad? Thanks guy's
I never replace them. Never had a problem.
There not torqued to yield
This guy would make an excellent instructor because of his level of clarity of instruction. And he's got a mellow tone which makes this easy to follow without watching.
Agree. He communicates in an unhurried, yet concise, detailed manner. I wish more instructors had this quality.
Clear, comprehensive vids like this make me want to go to the junkyard, pull some abandoned motor, and wrench it back to good running condition. Guys like Nam make it look easy.
thats how u stay poor
@@eksine what would you do
That's exactly that though, he makes it LOOK easy :D
Makes me want to NEVER buy a Subaru.
Yeah i find it interesting..i wouldnt mind stripping / rebuilding an engine like this one day.
one of the best videos i’ve seen in a long time. logical, technical, no bullshit rambling on or stupid music. thank you
For real. The content across this entire channel is top-notch quality, and I'm immensely grateful for it.
Yea this is a great watch. Great job. Thanks.
Dang yes. Best I've seen no joke.
Yes, indeed. I need technical INFO...not "Techno-hippity-pop"....thanks...but no thanks!
How anyone could put a thumbs down on this is beyond me.....This guy has probably done hundreds of these..nice job
Seriously. He looks like he can do this in his sleep 😂
Because their hating morons thats why.
Because most people aren't able to pull their motor out and sit in on an engine stand to do the head gaskets
It's a thumbs down because he used the wrong headgasket for a undecked block
@@TheArtOfDetailingOC are you using an old type composite HG Or new style MLS HG ?
That is the most convoluted head bolt torquing procedure I've ever seen. But Nam did an excellent job of explaining everything!
omg so much work just torquing the head down
That head bolt sequence is to spec, torque to yield is needed. If you don't, you might as well well just keep running the car till it dies lol.
what is torque to yield? and why is it important?
Click if the bolts were torque to yield I doubt he would have been reusing them.
He seems as if he has done a lot of these.
check? click?
From one mechanic to another this video was awesome. Very informative and taking the time to explain everything. 👊
Nam is super knowledgeable when it comes to Subaru's engines. Knows his engines, torque specs, dude is complete beast.
Got a '98 Forester w/ 2.5 DOHC. Had a classic failure of the "fire ring" of head gasket ( i.e.- Exhaust gases into cooling system). Had a shop do it cause I didn't want to mess with it. Failed 4500 mi. later. They claimed it was a defective gasket. They did it again for a big discount in price. Failed AGAIN after 5200 mi. Finally I said enough, I'll do it myself.
Ordered the Gates belt / pump kit, a new Subaru thermostat, Subaru "3 bond" sealant, after market Viton "O" rings, Viton cam & crank seals, associated gaskets and ARP head bolts.
Instead of Subaru, Felpro, etc. head gaskets, I used "6 star" brand as they ARE the solution. I'm lucky enough to live in an area that has some great machine shops and I had the block and heads trued and then put on a lapping machine to bring the surfaces to 25 - 30 RA. This is a finer finish than what "6 star" recommends (50 RA). (RA is roughness average measured in microns). A standard Greenblat grinder at automotive machine shops can only go to 118 RA.
I reassembled all per factory manual specs. That was back in 2007. I've put on 125,000+ since then with no issues. "6 Star" all the way, it's what all the rally engine builders use for their 500Hp+ engines. I'd NEVER use anything else on a Subie now!
How much did that cost though?
probably over $500, maybe more. Although it beats having Subaru redoing it over and over again. He shouldn't have to repay for a faulty gasket in my opinion. I would have taken Subaru to court on that one. The reason is because your expectation of failure of gasket should be in and around 50,000 miles or so. Maybe more depending upon the vehicle and how you use it.
sorry just see this post, in new zealand to replace head gaskets + labor and parts, 3 to 5K...so we just brought another engine for 2k and plonked it in. it was the EJ20 non turb.
I talked to a couple Subaru techs and they were doing so many that they were literally just using a 'wizzy wheel' roloc bristle head to clean the head and block deck surfaces -- very unprofessional preparation.
I just don't understand why more people wouldnt buy Toyota.
The more I learn from these videos, the more I find it hard to imagine why anyone would continue to buy and/or lease new cars over a lifetime. With the same money, you could build your own shop with a hydraulic lift, and keep a bunch of really nice used cars running.
Super competent and professional. Thumbs up to Mr. Nam!
the best subaru mechanic
Nam killed this tutorial. Love how well informed the boys at NV are and super impressed at how clearly he can present that info!
This was very clear and to the point. And all done in 20 mins. There are other videos showing the same thing but stretched out over 2 hours. Thanks so much.
Must I say...Nam, thank you so much for so much info & patience you give during the walk through on this job! There isn't many people like you. & I'm not that type to comment/review. But you & your camera guy deserve a double thumbs up!!👍🏽👍🏽I'll be keeping an eye on your guy's videos & supporting you guy's from now on. Keep up that hard work, & as always...✌🏽
This video saved me $2000. Ship wanted $2700 and I’m doing it myself for 730 in parts. Thanks guys!
Interesting to watch. My wife and I are having this same work being done on our Outback. I do maintenance on our car but this is something I am happy to leave this to someone else.
Love this vid, shows the real use of TH-cam, well done guys
wow, this has to be the best motor/car/ anything tutorial video I've seen on youtube. Great job guys!!
Hands down one of the best head gasket rebuild vids for a Subaru. Now I know why most shop mechanic are behind a desk in their 50s? The repetitive overhand motion cranking on those head bolts all day everyday will totally jack your shoulders.
I don't understand most of the words you just used, but this makes me feel like I know what my mechanic will be doing now when I take it in to get this job done. Bravo!!! Gained a subscriber.
Best Engine Tutorial I've ever seen, Well done!
Wow...After watching 4 min of this vid has definitely changed my mind about owning a Subaru...Thumbs up to the guys who have to do this job.
is there like an award for the most caring and precise mechanic in the world cause it should go to him
Well my wife’s car had a belt tensioner failure which made my timing belt snap and bend all my valves, the block and pistons were not damaged at all just the heads and I paid 1500 bucks to get new motor and get it installed. Wtf, time to go back and get me old motor and put new heads on it. This dude pretty much did the work for you. One of the best videos I have seen on TH-cam that shows you step by step. Now I have more confidence knowing that this guy is here to show us how simple it is.
Great video. Probably the best of any kind I have seen. The techs at my dealership told me that if you replace the head gasket with turbo gaskets they will never fail again. My 10' outback has 160K miles on it and so far no issues. (knock wood). Thanks for the great video.
Very awesome step by step tutorial greatly appreciate the time and effort you invested to put this video together and share it with the interested audience. Well done job man, once again big thank you
Honestly one of the best walkthrough videos on youtube. Thank you!
Best tutorial for HG replacement for Subaru NA on YT. Great job guys.
Why am I here. I don’t own a Subaru.
Think twice if you ever think of owning... I dread when I have to deal with this..or pay the labor ..
Got 2 B Dirt
I’ve never owned one but I’ve helped a friend remove a motor and it wasn’t that bad. If your mechanically inclined you can handle this in a couple weekends and save lots of money
Toyota same engine😅
How long it last 😅
You could
I have done this a few times and this engine builder knows his stuff! Good work!
Did you also forget to have the machine shop resurface the block along with the heads and decide to use sandpaper and brake cleaner like a shade tree?
That 'thunk' sound when Nam pops the newly machined head on the block is so satisfying.
I wish every dealership had a mechanic like this around, so well explained and so passionate about his job my local Subaru dealership is a joke and I will never go back.
Nam knows his Subaru engines! Now you should do a video with the engine in the car.
Perfect tutorials don't exi..... wait what!!!!
This isn't perfect.
Its great when you own one of these cars and are just learning 🖖
Questchaun better then some teen in there half lit garage
The care and attention to detail of this guy make me want him to work on my Subaru. Wish he was local to me! Awesome video team NV AUTO
Top notch technician and video. Looks complicated at first glance but like everything its actually simple. One step at a time following the correct method.
Still waiting on that engine removal video
🤣🤣
Step one. Unplug everything. Step two, unbolt everything. Step three, yank the engine.
A1 auto has a really good one
Even the oil change one is missing. ;)
I can do one
Thanks so much. Your instruction was very clear & detailed. I'm contemplating doing this job on my 2002 Forester with leaking head gaskets. Thanks again!!!
Me to let me know how it went for you
Well? Did you guys do your own head gasket replacement? How did it go? I’m going to put another reply in the top of the list but I was curious, the only thing Nam Did not mention is the cost of the resurfacing at a machine shop. Do they also do valve work at the same time? Thanks
Watching this 3 years after doing it myself. 99 Legacy GT. Pulled engine for ease of access and was replacing clutch. Had machine shop polish crank and hone cylinders. Heads surfaced and valves were good. New valve seals, new rings and bearings. I used FelPro gaskets. New head bolts. No issues thus far. Timing belt installation is more finicky on a dual overhead cam engine. Get both sprockets on one head aligned and the slightest movement when doing the other head results in valve spring tension spinning previous sprocket(s) out of sync.
Today I just officially finished this exact project ! It turned out great with new head gaskets , spark plugs , hoses , pcv , and timing , motor mounts , it runs alot better !! Thanks to this video, and others !
Can you share more details on how long it took and how much it cost? Also how much would it have cost for a shop to do the whole thing?
347K views in one year. This is a very well made video. I like watching these mechanical videos for information. But I'm blown away by the amount of views. Don't think I would ever want to own a Subaru
I sold my subaru XT when it reached 170K Kms. my mechanic said sell it before head gasket failed. It will cost me AUD $7K. the job not only replace head gasket but piston, ring, etc.
@@MichaelSmith-xk2bs :ď-x/F
Bet you Nam worked at Subaru dealership at one time in his career. This job is not for fair of heart, quite a few tricks involved. Would have been interesting to hear it run before and after, maybe no difference but still nice to hear a job completed and running.
I love these step by step walkthroughs! SO informative. More like this please!
Best Subaru gasket walkthrough on the internet. Thanks for this!
Amazing video. Nam makes me think I could do this myself...even though there is no way on this Earth I would ever try to do this myself.
I own a 2012 Subaru Impreza that just had recall work done for the valve springs. I think they had to do nearly everything described in this video as part of the work. Gives me a real appreciation for the work, and I REALLY hope they did it as well as Nam did.
Thank You a million times over!
You are heroes.
Good job. I dont have subaru engine but I watched to the end. I love the way you explain everything. The way u speak kept me to the screen. Thanks a lot for teaching us new skills daily. Cheers
I love the fact that you guys completed everything with complete information thank you so much ❤
Did anyone notice that the sequence that he tightened the bolts didn't match the sequence in the service manual he showed? Either way great video and I am halfway through putting my motor back together and couldn't have done it without Nam and this video. Thanks a million!
Explained very well👍
It can't get any more professional than this. Excellent video. Personally I was in a time crunch and on a budget so during a weekend I did my head gaskets (2009 Impreza 2.5 SOHC) with engine in the car and only cleaned surfaces with the 3m roloc so far it's been 2 years little over 20k miles no oil leaks or compression leaking into coolant system like it was no crazy oil or coolant consumption. I used the Fel-pro MLS and replaced most cooling components. If you have the time and money definitely follow this video instead.
One of the best service video's I have seen. Big Thumbs UP
Probably the best rebuild instructional I've seen.
We're STI manifold gaskets used?
Yes the STI gaskets were used I myself would have used an MLC copper gasket set.
Awesome video and very informative.
The heads looks great, but what about the block? I am under the impression that surface finish roughness is crucial to the sealing of MLS-type gaskets.
Best Teacher Ever , the tone and speed of his voice never change .
People complain about Subaru engines but in all honesty they're super easy to work on. I have a 99 legacy 2.5gt with the ej25d and it's got over 300k on it and still runs amazing even after being in flood water up to the door mirrors 4 years ago.
You know, as fun as this looks, I think I'll just pay my mechanic's trip to disney...
dbzsuperfan711 I’m currently doing it, you gotta have the passion for it 💯
It's also a good idea to use head gaskets for a turbo engine on the naturally aspirated engine of the same type. The turbo head gaskets are more durable and your engine probably won't blow a head gasket ever again. Make sure all the coolant holes line up and you should be good to go. I learned that from a Subaru technician. Their shop specializes in Subaru's only. He told me about a couple other tricks to make the bad head gasket problems on these engines better,but I can't exactly remember those ones and I don't want to spread bad info. If you're going to do this job yourself I'd do some research.
VEry good video and no awful music so very professional video . I have done many of these head gasket replacements over 26 years . I usually remove the intake manifold . When I put the belt on I use two small clamps to keep timing belt in place . I usually put the belt on and then the tensioner followed by the lower puley with the fence on it . Excellent video and straight forward with clear instructions good job Bill
Well done. Hats off to Nam he makes it look like a simple job. About to get mine done...AGAIN. Last HGs only lasted 60,000kms.
How come you guys didn't scotch Brite the pistons? Figured while the engine was apart you could clean up the carbon build up.
It's understood to be best practice up here in the north where everyone has a Subaru and we have Subaru experts to replace those head gaskets with a multi-layered metal version, not factory OEM or part store "Felpro" gaskets. The multi-layered metal gaskets last longer.
🤔 felpro makes the best MLS gasket for these cars.
Nice Nam. I put over 150,000km on my STi swap and still running great since you built it.
Best auto repair vid I've ever watched, thank you!
I love this guy, I've have been trying to complete my reinstall for so long, thanks for the step by step instructions, omg gosh, im so greatful #doityourselfmommy!
Made it look easy good job 👍😀
Love this guy. Used many of his previous vids especially for the timing belt/cooling system on WRX
Nice to see good work being done and effectively communicated. Refreshing.
18:26 Did the left cam sprocket get damaged from the machine shop? It wasn't cracked on the top right corner before.
Mine got cracked at the machine shop the same way and I replaced it cause I didn't want to risk chewing the belt
Definitely did 3:12
@@lipreader411 Very Good eye!
That was a very good clear and concise video. Nam it's great in front of the camera. Quite calming in fact!!! My sister's Suby drips oil so bad!! I'll show her this video and say ... Fix it. Easy!!
Very informative and well done. I do not have a Subaru, or work on any but I enjoy watching and learning this sort of thing.Hopefully I don't ever need to know this procedure but if I do I know I could do it from everything you have shown.
10:05 LOL, that was NOT cleaned with a scotchbrite pad, unless they stuck one to an air tool.
You can get scotchbrite rolloc attachments...
I was about to comment this too lmfao
I was thinking the same thing.
it was definitely buzzed with a scotchbrite pad on an airtool, stuff doing that by hand!
Yeah looks like wire brush to me
My hands became itchy from watching this great video. Ive done of of boxer engines before and it wasn't that hard. Now I have to look for a Subaru on Craigslist to satisfy my itch.
super vid guys, thanks so much i am just getting into this same job on an o6 and this sure was good to see, and bookmark!
I sure appreciate the time it took for you guys to make this for us guys that need to do our own, due to costs, you sure do a great job with that engine.
Damn Nam...you DA Man!
Love watching people that known their stuff.
Yay to subaru content!!!!
Ok th-cam.com/video/-jDrkEEK99E/w-d-xo.html
Are reusing head bolts part of the install procedure?
I thought it was common knowledge to use new head bolts/studs on all engines, because the torquing procedure stretches the threads, and redoing the procedure weakens them. Head bolts/studs are the only fasteners that's soul job is to contain explosions.
depends on the motor.. most head bolts are reusable..
Subaru says you CAN reuse them. I replaced them on my Engine.
Not any more, torque to yield is most definitely the standard for anything built in the last 10-15 years and they always recommend to use new bolts. I'm assuming these Subaru's are torque-to-yield based on the torquing procedure but they are certainly out of the ordinary saying you can reuse the bolts. Torque to yield permanently stretches the bolt by design so they really shouldn't be reused.
I suppose that depends on how long he's guaranteeing the work for.
The best video of engine repair. I spent a lot of money on my Subaru just to figure out that head gasket is damaged, since oil is getting empty every 1000km and coolant stations on oil filling hose. I am going to request a mechanic to do this. Thank you for the video.
This is one of the BEST how to videos I've seen. Dang... Thank you !
This video makes me never want to own a Subaru engine.
You are trollling. Watch an engine removal from ANY other motor and count how many vacuum lines(just one important item of note) ...remember that number, then watch a video about a Subaru engine removal. Then watch any other motor vid about the head gasket break down, then come back and watch this one...you'll then figure out that you just gave a VERY uninformed opinion.
@@heuster lol vacuum lines? Umm, most engines don't require you to pull the whole thing for a head gasket. a matter of hours.Vacuum lines.....
@@corwininadsm ...I will never own one of these for a project car.
My subaru friends were telling me this the other week as if it was some sort of benefit. "Oh just pull the motor for any maintenance it only takes an hour". What a fkn disaster you shouldnt have to remove an engine for basic maintenance. Poor engineering.
@@mcfoolskully
Seems "basic maintenance" is relative.
What is that bolt extractor you used on the rusty plastic cover bolts
Gabriel Wagner turbo socket
Bolt extractors are tapered slightly and have teeth that bite into the head of the bolt a bit, you have to tap them onto the bolt.
Irwin makes a reliable set , and you can buy in just about any hardware big box store..I keep it right in my cart for subaru engine jobs.
Very informative with great production quality...this is how, a how-to video should be done.
Make sure to change your oil a 2nd time pretty quickly after a head gasket change. You'll more than likely end up with high aluminum content in your oil. I sent it off to blackstone labs for testing that.
Some points to consider:
1. Go ahead and blow the other cam gear off, or don't be surprised when the head come back from the machine shop without it.
2. May want to drain that block before you tilt the engine and spill it all over yourself.
3. Clock the motor with pistons half way through their travel so as not to risk valves contacting pistons.
4. Remove the block dowels before cleaning the deck.
5. Check both the block decks and heads for warping and pitting.
6. Reusing stretch bolts? Spring for some new ones and double the longevity of the repair, ffs.
7. You're not showing how to hold the cam sprocket while torquing it. I like to use an old belt and some chain tool for plumbing; just don't use metal tools directly on the gear so as not to chip it. Same is true for the crank pulley.
8. No crank oil seal replacement while it's exposed?
Good points.
8. Definitely replace the crank seal *and* the cam seals. Doesn't make sense to do all that work, and not change the seals.
6. There's two schools of thought on re-using stretch bolts... the only argument against using new head bolts (only argument that is valid) is the added expense. If there was no cost differenc on the gear so as not to chip it. Same is true for the crank pulley.
8. No crank oil seal replacement while it's exposed?e, if new bolts were free, would any in the "re use" proponents still not use new ones?
9. Plus do valve clearance checks/adjustments while the rocker covers are off.
HAHA FFS! Always replace the head bolts. Better safe than sorry.
Not double, it will never have to be done again. Unless you didnt use STi headgaskets and used another shitty graphite one, then it will fail no matter what you do as its cheap gaskets that Subaru used only on EJ25 SOHC.(incredibly dumb decisions seeing how it stained their reputation even if no other engine was affected)
Did you say "STI head gaskets" at 11:07? I'm having trouble understanding you right there.
1 year late but he said SK
UnafraidCookie caption says sti tho also my 2.5i has the sti gasket or wrx whatever I has (it’s an 2011) and now I take advantage of it because now it should be durable now so I floor it drive a bit hard since I ain’t afraid besides I got it done at my work so if it’s wrong it comes back to them and I got extended warranty so win win
Puggernaut TrillTraks use part number shown
Fox MacLeod use part number shown
Very clear and concise video, highlighted the right parts and fast forwarded the unnecessary bits. Saved for later ;)
Wow. This is a first-class video production, and Nam is a model of the ideal mechanic. (I hope the shop has an active air-trading circulation system to remove the carcinogenic fumes coming from the brake-clean, etc.)
Do not use abrasive Scotchbrite on the deck. You basically sanded the deck. Good chance of it leaking again. Use non abrasive pads and hard nylon brush. And CRC Gasket remover is your friend.
The turbo version gaskets fail as well.......ask how I know.
I suspect I know the answer, but I'll ask just to be sure. How do you know?
@@Toshikills it’s fantastic when someone says ask me how I know, so you ask how they know then don’t reply. Beautiful
Definitely I need him redo my 2008 Subaru exactly this is my problem now with 110000 miles on the engine . Worth every dollars I spend with this special service expert.
Nam is such a good mechanic and he's to thorough with his explanations
But its not leaking early like ford focus rs does.
Or late ... like BMW
Ford said they mistakingly used the incorrect head gasket for however many productions cars for the Focus RS. The problem is obviously fixed now.
Subaru from 1999 thru 2013 is a LONG run for this problem!! Shame Subaru...
This is why I'll never own a Subaru ever again. The dealer and Subaru denied anything was wrong with the gaskets lol. About $3k later and my POS is on the road again, these engines should all be recalled.
Most everyone knows its not if but when they will need replaced. i use Mobile 1 and I am at 160K miles so far with original gaskets. The turbos don't have this issue.
The engines are fine, if you get rid of the crappy gaskets.
Thankfully this happened when mine was still under warranty. If I had to pay for it myself I would be be driving a Honda again. With that said, Subaru replaced my block and head gasket for free when it failed the oil consumption test no questions asked. I also have an Outback now also with a CVT I'm hoping it last as long as I own it.
Robert NES816
You never take a car to the dealership for service!!!
@@chrisj197438 yea, $3000! Are you kidding me? I'm finding estimates all around town for $1500, ball park. Fuck the dealership. They're only good for warranties and recalls
I just picked up a 2001 Outback. I was afraid of having to do the head gasket, due to a clear oil leak issue on mine. Awesome vid, can’t wait to perform this repair on mine🖖🏽🍻
I’m not a mechanic but I love these kind of videos. Thanks
How the hell do people do this without removing the motor
Saw off the fenders?
Heh, not easily. Apparently you can jack up one side of the engine at a time to get enough access to clear the head bolts. But frankly, I don't think it's worth it. Maybe if you HAD to get it done & didn't have a garage or engine hoist.
Works fairly good. Just have to Pull the Head Bolts with the Head itself. If you dont put them Back in before you Put the Head on, you gonna have a Bad Time.
guys at my dealership do it day in day out like clockwork. takes a lot repetition and practice. i wouldnt recommend even trying it in the cad the first 10 times or so
Way easier to just pull the engine. Then you can see everything and clean it all up better too.
I had a brain aneurysm watching this. Great vid though.
Nam, you are very knowledgeable and explain at a great pace. Please don’t fall into the typical “uneducated TH-cam” explanation style of saying “thee” rather than the when appropriate. You’re NOT the typical DIY guide, don’t short yourself.
Got the first Subaru I have ever even ridden in today. It had been nearly perfectly maintained, but got in a crash and broke the grill and the radiator. Going to replace the belts and gaskets since I have to remove the radiator and stuff anyway. This is gonna be cool to learn