How to De-carbon & Replace Head Gaskets On A Onan or Many Small Engines. DO BEFORE ADJUSTING VALVES
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- เผยแพร่เมื่อ 11 ม.ค. 2022
- Here we will show the process we use to de carbon heads, valves, pistons and combustion chambers without full engine dismantling. Then we will show you how to install new head gaskets. This ALWAYS should be done before any valve adjustment. This is a REGULAR maintenance item you should be doing EVERY 250 to 500 hours according to the manual! It may just save you a blown engine!! The process is very similar for any in block valve L style flathead engine. Be sure to watch our video on the proper way to adjust Valves on Onans. We also have videos on how to adjust valves on Briggs and Stratton and other overhead valve engines as well as decarboning and adjusting valves on flat head Kohlers and others.
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Thank you for sharing this video, very informative.
Glad it was helpful! Thanks for watching and the comment!
Thanks for taking the time to do this video. I need to do it on my 318 and 420
You are most welcome, thanks for watching and taking the time to comment!
Nice video. Appreciate it!! Saved your website as I have jd 318 with an onan I just pulled motor to do exactly what this video is about. And yesterday I just bought a case 380 LL little landscaper . Seems like a good running tractor. Just worried parts might be hard to come bye.
Thanks for watching and the comment and thanks for the sub6. Glad it's was helpful. 380 is a handy little machine. And 318 one of the best Green ones lol.
Well explained. Easy to understand.
Thanks for the comment and watching!
UPDATE a couple of years ago we sourced good quality head gaskets we offer for sale on our website caseingersolltractors.com
But do prefer OEM if in the budget but have usrd hundreds of the aftermarket gaskets with no issues as well as same amount of OEM with out issues.
Great video well explained thank you…
Hi Thanks! You are welcome thanks for watching and the comment!
Great vid, thx!
You are welcome thanks for watching and the comment
Very informative video . Thanks for sharing . Is it the same concept on a case 646 cck ? I purchased one and it's very dirty on the outside so I'm assuming it needs to be gone through
Hi and thank you! Yes it would be very similar on a CCK be sure to watch the valve adjustment video as well it will be out soon! But most CCK valves we set at .008 intake and .017 exhaust. Good luck and let us know if you have any more questions.
@@caseingersolltractorsnortheast ok I appreciate it . Thanks
You have more guts then me. I pass on loosening head bolts with an impact. First smack them with a hammer. I’ve had to fix to many broken off head bolts.
Its on lower setting, you can feel right away what ones are going to fight lol. Only had 2 ever break because of the impact and was My fault I Knew I should have not kept going lol. Any other head bolts I have had break broke after trying with the ratchet after knowing they were a issue with the impact. We find most times its the top center 80 percent of the time or more. Is that the one you see most often?
@@caseingersolltractorsnortheast I put a little pressure on the bolts as if I was tightening them,they loosen right up after that
I began decarbonizing my JD 420.. The carbon wasn't too bad, but what I did see was oil on the bottom of the cylinder. The piston didn't move much. How serious is the oil condition? I wasn't really planning on pulling the engine and doing a ring job. I just bought the tractor and have not used it at yet.
Run it and see. It's not uncommon especially with the hours these machines have on them. If the carbon was not bad then it's probably not burning much. Run 20 50 oil and see what you find. Thanks for watching and the comment. Report back if you don't mind.
Run it. If the carbon was not bad it's probably not burning much. With the amount of hours on them by this point a little oil is normal. Run 20 50 oil in it. Report back if you would. Thanks for watching and the comment. Let us know if you need parts for a Onan or anything. Caseingersolltractors.com
I'm performing this job in a p220 on my bench. I've heard suggestions to put oil on the threads of head bolts before installation. Your opinion, yes or no?
Hi the torque specs are dry, adding oil will change that. Also if too much oil you can damage the block. We spray both the block and bolts with brake cleaner and let it dry to clean. If you want you could do a light coating of something like wd40 or liquid wrench and let the bolts sit a few min to drip excess. Also you could clean the holes with brake clean and just install new bolts too. But like we say it's not a race car or rocketship so don't over think it as that can get you into trouble too lol. Good luck!
It's getting gas spark I check the engine timing but it will not start please can you help me or give me a advise please
Hi, without seeing it, it is hard to say if you say it's getting gas, spark, timing is good and compression is good.
I do the same thing to my engine it's running a generator and I try to start it and it will not start can you give me an little advice please
Sorry without seeing it its hard to say.
Should I anti seize exhaust bolts? Or does it just get burnt off when engine gets hot. Have had problems with steel bolts and aluminum engines, carbs ect. Good info on video, spank you.
Hi you can use never seize if you want. Thanks for watching and the comment.
Are the brushes you use described on Amazon as "nylon abrasive" (Which sounds pretty harsh for use on aluminum) or did you use a non-abrasive brush?
Honestly don't remember what they were described as. But as far as being aggressive it's as much as the operator as the tool. I would think if they are nylon you should be fine just find the speed and pressure you are comfortable with and works well for you.
Where is your video on quality of OEM and non OEM gaskets can't find it
we have not released it yet its on the list lol
That answered my question too.@@caseingersolltractorsnortheast
Where do you get them nylon brushes for cleaning?
amazon and ebay.
Just a couple of questions. Do you or did you check for warpage on the gasket mating surfaces on the engine and head. Engine not as likely to warp like the head I suppose.
And do you leave some time between each 5 lb torque setting.
I do that on my kohler k series engines. I leave 15 minutes or so between each torquing. And same at the last torquing. I leave it 15 minutes or so, then recheck.
Every body has their methods. Just wondering what you do or think about that.
I have a Case 446 that I will have to do the same job to as you did. Thanks for the information.
Hi, no we don't leave any time in between. To be honest no real reason too, we torque everything cold. It's bad to torque a hot engine and that would really be the only thing that would effect the torque maybe. We do go back and re torque after we have ran the engine up to operating temp and let it cool back down. But as you have probably heard us say many times it's not a race car or air plane lol. As far as the heads if there was a head or head gasket issue we do check and go over them very well to see if they are true or why the failure. But when just doing maintenance we just check them over quick. Honestly we have not seen very many heads or decks un true on these engines unless it's a big failure and obvious head/block damage. Even when there has been basic gasket failures the surfaces remain true most of the time. Thanks for the questions.
Case Ingersoll Tractors Northeast thank you. Ya wouldn’t torque a hot engine. I do run them. Then check when cold after a few hours of running. Not a race car. For sure. Hehe.
@@noelstractors-firewood57 you are most welcome 😊
I run seafood in.mine
.it keeps it clean
Hi Seafoam is good stuff but these engines need decarboned in a normal schedule. Seafood may help some but won't stop carbon from building up in these small engines, may slow it down as the ones that use seafood constantly are a bit less Carboned up. But still build up and not taking a chance blowing a multi thousand dollar engine because of carbon build up. We really like seafood for keep carbs clean. Thanks for watching and the comment!
Seafoam,sorry.
Loll no worries knew just what you ment!
I have a JD 318 with no compression, what is your best guess to my issue? I haven’t torn it apart yet. I want to do the work my self but first of all i don’t know where to get parts. Local JD cant even get most of them anymore.
So you have no compression on both cylinders? How are you checking? We stock and can get Onan parts. Be prepaid though worth it they are not cheap.
@@caseingersolltractorsnortheast just by the way it would sound, it sounded as if only the starter was spinning, it sounded like it had no compression. Also im assuming thats why the fuel pump wont pump fuel….
Then I went and checked with a compression tester and determined i have none.
Hard to say could be hung up valves, less likely 2 rods broke or crank or cam broke. Can't say more without seeing. Pull the heads and you will know in 5 minutes
what is that spray you are using to soak the carbon before hitting it with the nylon pads?
It was a private label product no longer made. Thanks for watching and the comment.
@@caseingersolltractorsnortheast I spent around 2 hours on the 2 heads on my onan B48g engine yesterday scrubbing trying a variety of products. NOTHING was touching getting the black crud off the heads. Resorted to using a roloc disc using it just agressive enough to take it off...then used a buffing disc to remove any light scratches left.
@@mackendw Lots have had good luck with oven cleaner and some penetrating oils. Rollocks work as well just have to be careful and sounds like you were. We sue them some times too the less aggressive grit ones.
Wow that’s a filthy engine I try and take every shroud off to degrease and hose it down if I’m doing any sort of work to any engine not just onans
Yes we get them in much worse lol we are going to share some photos in a video soon of some of them, lol. But Ya thats why we addressed it in the start of the video. It was far worse lol. Our steam cleaner was down when this was filmed and it was winter so thats why we went only as far as we did. But it worked out fine. God news is we have a big ole USA top of the line steam cleaner now lol. Thanks for watching and the comment! Nice Big bud!
@@caseingersolltractorsnortheast ya lol I wish I had a big bud little rare and out of budget if you’ve ever watched welker farms they have a few of them steam cleaner would be nice to have I have a 6000 psi commercial grade gas pressure washer it seriously takes both hands and I have to install a 75 degree tip to avoid pint or decal loss
@@hunter7476 yes watched them recently. I been a fan of Big Bud for many years. Each very cool machines. When I farmed dreamed of having one even though more tractor than I needed lol. Ya we have a 4500 psi machine too but the steam works beat to take the grease off. 6500 psi that's pretty crazy no mud sticking with that lol.