Compression and Leak Down Testing an Engine with Suspected Internal Mechanical Issues
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- เผยแพร่เมื่อ 26 ส.ค. 2016
- In this video I show you the basics and idea behind doing a compression test and a cylinder leak down test on an engine with suspected internal mechanical issues causing a loss of compression in one or more cylinders. These tests help in finding the most likely cause of loss of compression like a bad head gasket, warped cylinder head, cracked cylinder head or cracked block. The leak down test can more accurately tell you how much compression you are loosing and whether you have leaking or damaged exhaust or intake valves.
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Due to factors beyond the control of Ratchetsand Wrenches, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. Ratchetsand Wrenches assumes no liability for any property or personal damage that may arise from doing a repair on your vehicle after watching any of my repair video's. Due to factors beyond the control of Ratchetsand Wrenches, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Again Any injury, damage or loss that may result from improper use of tools, equipment, or the information contained in this video is the sole responsibility of the user and not Ratchetsand Wrenches. - ยานยนต์และพาหนะ
A very methodical and thorough explanation - thank you for taking the time to share this!
Thanks for the vid! I have a combustion gas tester that works well for testing head gasket leaks. Just changes the color of a liquid when combustion gases are present in coolant reservoir. i'm sure you've seen that too. Also, your advice on the iac valve was spot on. Replaced it and that was the fix.
Nice, glad you got that fixed. Thanks for the update.
Exactly what I was looking for! Now to decide if I want to buy these specialized tools and put myself in the position to potentially replace a head gasket. Thanks!!
I love how you show that you don't need a leak down tester to do a leak down test you can use a simple hose from a compression tester. Amazing! Wish you would come back to TH-cam and do some more videos your explanations are always one of the best!
Will be back very soon, just finishing up building a garage :)
thank you for sharing your time and information..
9:07 -- This is why I love your videos (and your videos are very help too).
Lol. "attach our air hose... Got-dammit!"
You are the best youtube mechanic, period.
Great Video on checking for blown head gasket. I had same problem on my olds but was the head,due to idot lights that failed to come on.Know I-have Head temp gauge in my car to keep close eye on engine temp.But hey In that Video lets try Camera in the Cyl to see what's going on may save lot time and maybe see the problem also. Thanks From Donald
Excellent video! Appreciate it and of great help as I tackle a ‘67 VW bug.
great video you did a good job of showing how to use the tools
Thanks for uploading this! Useful!
np, glad you liked it. cheers
Very Good Video. Best I've Seen Anywhere.
Another excellent review.
Absolutely superb sir.thanku.this has helped me loads.stephen from the uk.
Keep up the brilliant work sir
Recently subscribed and gotta say I love the videos! To everyone saying that he lost a subscriber, know that this stuff isn't easy, and that he doesn't have to do it if he didn't want to; but this takes time and money and patreon helps him put these videos out. I'm bummed as well that there are patreon exclusive videos, but I'm still glad there's other videos that he releases to the general public!
Thanks for all of your hard work. You have gained another subscriber :)
Welcome aboard utbemo, there's only 4 of them. The dumbb ones that don't get what you described. Glad you like the channel. cheers
Pro-tip: Don't call people that unsubscribed dumb. Shows general disposition towards the rest of your audience.
Only "dumbb" people, don't know that free videos are used just as exposure for Patreon. If you have another idea for a platform in which to *direct* people to your patreon account, *other* than generating initial free videos, I'll retract my statement. ;)
Great video. Subscribed.
Absolutely fantastic video
Thanks a lot for making this video. I've done this at school. You explain it very well than what our instructor did🤣
Which school
@@tariqalmaashani877 Mohawk College, Hamilton. Ontario, Canada.
always interesting, thanks ...
..Very, Very Good information!! my son poured 10 gallons of water in an old beater Ford Ranger he had once and asked me what could it be?? Yep, blew the head gasket & warped the head. He scraped it & bought a 95' Honda, it's still running after 10 years...
lol, good thing it was a beater. 95 Honda's and Toyota's are the longest lasting cars ever made.
Thank you, well done.
Good video in showing the compression and leak-down methods. Just wanted to point out a small error. On a four cylinder engine, you would turn the crank 180 degrees between each cylinder, not 90. It's easy to tell how many degrees to turn. For a four stroke engine, it takes two complete turns, (720 degrees) of the crank for all cylinders to fire, doesn't matter how many cylinders. So you would divide 720 degrees by the number of cylinders. In your case, that would be 720/4 = 180 degrees of the crank to bring each cylinder up to TDC. And for one example on an eight cylinder engine, it would be 720/8 = 90 degrees. Keep up the good work!
stuzman Hey man, just wanna say thanks for clearing that up. I have an exam on compression and leakage tests tomorrow and was a bit confused about the timing marks for each cylinder but you made it clear. Therefore I need to make sure that cylinder number one is at TDC by aligning the timing mark of the crank pulley where it is indicated on the engine. From there, I rotate the crank pulley 180 degrees to bring its companion cylinder which is number four to TDC. Then do the same for 3 & 2. Though respecting the firing order which is 1, 3, 4, 2
Iman (the Ratchets And Wrenches guy) is talking about turning the camshaft by 90 deg to get the next cylinder in the firing order at TDC. You talk about the crankshaft. You might be right if the crankshaft sprocket is half the camshaft sprocket diameter.
You would turn the cam 90 degrees.
The crank 180 degrees.
Very Nice Brother , Thanks very very much
very informative, thanks!
np, glad you liked it.
Had the same problem with my '06 HHR, turned out to be the block. Can't complain after 200,000 miles. Thanks for sharing.
Was it warped?
*poured water in the water jackets...
wow thats crazy I'll have to keep an eye out for that.
This is pure gold.. no blabbing
LOL----this video is not car specific yet this is the exact engine I'm going to do this test on. That tells me head gasket issues are probably pretty common on this piece of junk. Great video!
Thanks for the awesome video. I wish I had the money to spare to watch the head gasket job get done on this car. I'll figure something out.
And being a GM engine, I am not at all surprised the head gasket or intake gaskets have failed. Seems to be a running problem with their engines.
np, there are a lot of head gasket video's out there on youtube world. Change one on a four cylinder you can probably change them all.
True. I was just interested to see what other damage was done to this engine.
Good info to share
Glad you like the video, thanks for commenting.
Ratchets And Wrenches I agree with the comment above mine just I wish you would have shown the readings with the gauge. good stuff I enjoy your vids.
Excellent vide.subscribed
You are great teacher
U are the best ,thanks
Great Video!
Thanks for watching and commenting, cheers.
Hey Ratchets, with a wet test increase in pressure by only 5-10psi would the piston rings need replacing? (Also the spark plugs have white build-up)... Thanks for the great vids!
Thanks 🙏
Great steps for checking compression and leak down. I'm currently employed but when I retire I think I'd like "flip" cars. I have most of the tools and a nice shop but I'm not sure what I'd be getting into. I'm guessing a lot of check engine lights and overheated engines are in my future. :)
There's more money in fixing car's than flipping cars these days. I would be much better off financially fixing cars than flipping them but I don't like running a shop :-)
Thank you for your input. That's one reason I thought about flipping cars...no one hanging over you waiting for there car to be repaired.
Have a po302 on my 2006 Subaru sti. Currently troubleshooting
Thanks boss
Thanks. Glad I subscribed.
np, welcome aboard.
Actually, I subscribed some time ago. I used to do more of my own work but now am reduced to oil changes, brake jobs, etc. Nonetheless, I enjoy learning new things and appreciate your effort in educating us.
Hi, wow, wonderful , I'm looking to buy a compression gauge , what brand would advice me which is accurate and true reading ?
Coolant temp sensor appears to be fine as far as my obd2 shows as well as o2 sensors
Great vid. I bought a fuel pressure tester that looked good but broke quick. Any good suggestions on a quality fuel pressure tester?
OTC makes good ones IMO I used to have one, gave it to a friend and never got it back...lol now I have a cheap harbor freight one. Havent used it much but it worked the few times I have.
Will a blown head gasket cause more water through exhaust pipe than usual? I literally can put my can n it throws water
Leakage detected thru crankcase. Tech suggested new engine. Any idea what the problem is??
Hi there , even if our battery is new , by cranking the engine we will not drain the battery ?
So we have to distinguish between problem with the head cylinder and the Pistons ?
If the problem are the Piston rings then the engine is finished and cost lot of money to
repair the Pistons , Right ?
And what if the car is a Hummer H3 with 5 Cylinders , how do we find out the positions of
the Pistons either at exhaust or intake ? as you said the cylinders are acting like sisters
2 by 2 .... and how do you position the cylinders using the timing chain ! ? Your video did
not show how to do that .. .thanks a lot ..
Hello, R.A.W! Great video. I own a 2004 S40 Volvo (older model body, 1.9L, turbo). I understand that this car's timing is based on TIMING MARKS versus TDC which I thought was the same but interestingly it ISN'T. Question 1 (Q1)?: What have you heard on this?; Q2?: why do I get zero compression on all four cylinders when performing a compression test? Am I doing anything wrong? BACKGROUND: my serpentine built busted on me on my way home from work due to a small oil leak from my cap seal being cracked. I towed in home. Checked and discovered my timing belt was perfectly fine. I had to remove harmonic balancer and gear for timing build for purpose of cleaning debris from serpentine built wire getting wrapped in some stuff. I reinstalled everything and set it to timing marks and all it does is crank with NO START. What do you recommend? any help is greatly appreciated.
I was thought not to remove all the plugs before running the compression test. Can you kindly explain why you have to remove all the plugs before the test. Will the test results not be affected if all the plugs are removed before running the test on each cylinder?
Is there a way of knowing whether it is the gasket or the head is the problem? (besides from changing the gasket first)
Also are these kinds of rides worth fixing? or would it be more economical to swap out the engine? or send it all to the scrapyard?
You all probably dont care but does anyone know of a method to get back into an Instagram account..?
I was dumb lost the login password. I appreciate any tricks you can give me.
@August Jerry instablaster :)
@Danny Joseph thanks for your reply. I found the site thru google and im trying it out now.
Takes quite some time so I will get back to you later with my results.
@Danny Joseph it worked and I now got access to my account again. I am so happy!
Thank you so much you saved my ass!
@August Jerry Glad I could help xD
Anyone else able to find his patreon page? Not having any luck with your link
Awsome video, It should be $1 dollar per video, because you deserve it, and you would've made $39,593 dollars for this video.
are you in Otay
Passat 2.8 v6 running rough at idle better at higher rpm codes thrown po341,300,301,302,303: Missfiring on bank one. Ltft: running rich stfr: running rich. Maf cleaned/tested and works at 1.69v at idle 2.65 at 2500rpm. Cam sensor replaced, full ignition tune up done with no avail. Timing appears to be spot on. Question is where do I go next?
I'm about to test the vacuum system, then the fuel with a gauge, crank sensor test still have yet to be done. I'm lost if you could send me in the right direction is appreciate
Have you checked camshaft chain tensioner, its guide for excessive ware, chain itself and the timing for that bank?
What if the compression gauge goes down once you crank the engine over? I know that’s not normal
Hey can anyone help me. I replaced the head gasket on my 97 4runner started it up and still got plumes of white smoke. Doing a leak down test and all of my intake valves are leaking air really bad. Any ideas as to what I did wrong?
What happened if I don't remove the ignition fuse and I do the test , is that mean I rewind something?
What happens if you don't disable the ignition system and you run a compression test anyting
redbaron2448 well your car will just turn on and maybe it will throw off the test results. Not sure maybe it will just get your tester wet with raw fuel
My audi a4 1.8t
Cranks but doesn't start. Has fuel and spark
Could it be a head gasket?
Year, mileage? Any check engine light? It could be, but it could also be many other things. Could be the starter, could be compression, could be timing is off, could be your anti-theft system.... the list goes on...
here in our Country I have Air Compressors are measured with Litres and HP .. I do not know which cabability to chose : can you guide me : I want buy 125 PSI Compressor
What brand your compression tester and how much
Arnold Baclig Tou can rent compression testers and leak down testers from Advance Auto for free. I know this doesn’t answer your question but thought I’d offer this info anyway.
Are u the same guy with that speedkar channel ??
You didn't say how to regulate the shop air to 40/70/100 etc psi if using your schraderless compression tester hose. I'm assuming you used the regulator on your air compressor but not everyone will know that.
I'm still trying to diagnose my evap leak and egr codes. I cleared them and they haven't come back yet. I replaced the evap purge solenoid with a brand new ac delco part and the problem still exists the same as before. I'm trying to diagnose my evap canister vent solenoid but the book tells me to use a scan tool to command the solenoid on, but I don't have said multi-thousand dollar scan tool. I have an innova tool and as far as I can tell, there's no control of the solenoids.
Can I simply disconnect the connector and supply power to the solenoid with a power probe tool? How do I know if it's switched by power or ground?
I looked at the wiring diagram for the evap system and if I'm not mistaken, the main power relay supplies power to the evap vent solenoid whenever the ignition is on. The ecu supplies switched ground when it wants the solenoid energized.
The test said to hook up a hand vacuum pump to the canister side hose on the vent solenoid and see if it holds 15 inHg with the car off. It wouldn't build any vacuum. Next was to turn the ignition on and command the solenoid on with scan tool which I don't have. Instead I supplied power to the relay pin and ground to the ecu pin on the solenoid with the harness unplugged. Then I pumped the vacuum up to 15 inHg and it got up there but immediately begins slowly dropping to 0 once you stop pumping.
The last test was to pull the harness plug off and turn the ignition on and test for power on the relay pin and it does have power there so the book says to replace the evap vent solenoid.
Any reason my rudimentary method of testing could be wrong?
You did well, better than a scanner even. Looks like you have a leaking vent solenoid. Replace and confirm repair the same way. GL
+Ratchets And Wrenches thanks. Ordered a new acdelco part from rockauto.
Thanks, mate..crystal clear 17OCT2017
1:49 c'mon you can do it, lol
COME ON!!!
Very good info！！！ your Chinese viewer
Nice, RnW has gone global :)
România is also keeping an eye on your ☺
not 90º, but 180º turn on the crank
4 cyl engine makes a stroke each 180º ;)
🙂
At 9:48 it sounds like my morning guts after a night out finished off with taccobell. We all know what happens next....
you hit the shitter 😂
what would happen if you forgot to press the gas pedal
I gst try fzess
You should get a sponsor like #EricTheCarGuy did, or put a donate button.
Will need 500k plus subs for that. Should have that in about a year.
What about donate button?
They don't work, patreon page is a long term plan. The video's I will be putting up there will attract a huge following. It'll just take some time.
Ratchets And Wrenches I followed the link and it said the page didn't exist. Still got it up?
So pretty much the heads gotta come off when the compression test fails
sadly, I ve unsubscribed not because of the content (BTW I love the approach), but because of limited knowledge shared.
The leak down tester in this video doesn’t work properly. It’s the cheap one from Harbor Freight Tools. The company that makes it doesn’t know how a leak down tester should work. I know that sounds ridiculous but it’s true. Harbor Freight does sell a good leak down tester now under the name Maddox. A proper leak down tester has two identical gauges that go from 0-100 PSI. In this video he doesn’t actually use the leak down tester. You don’t need a leak down tester to check for leaks at the valves or head gasket. Any leakage at those points is not good so you don’t really need to know the exact percentage. You just need a spark plug hole air hose adapter. You can use the hose off a compression tester like he does in this video. The main purpose of the cylinder leak down tester is to measure the exact percentage of air leaking past the piston rings. Even an engine in great condition will have some leakage past the rings because they are not air tight. So you need a leak down tester to see if the amount of leakage is normal or if it’s too much. Also, if you have a piston at exact TDC it will stay there no matter how much pressure you put in the cylinder.
Yo good thing It was junk car. This man pulled the power tool to screw out the spark plugs
The low compression in cylinder 1 doesn't bother you?
hnkfsh81 He said that was pretty pitaful.
90° really? am I that drunk? 7m30
Don't condemn God, please he loves you.
Good vid .
he sounds Iranian. Not sure if the spark plugs need to be removed for compression test or not.
ChessGuru he is Hispanic but they have similar accents
Thanks much friend
You only bleeped one of you swears. . .
man I never seen way too many jump cuts
(not talking crap)