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  #1  
Old 03-12-2014, 10:29 AM
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PEVO PEVO is offline
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Damn oil leak again!

About 2 years ago I had a couple of oil leaks on my kohler 28efi, so I pulled the motor & replaced the valve cover gaskets, main crank oil seal, case seal oil seal behind the oil filter cooler adapter that the oil filter goes on. Basically every seal, gasket, and o-ring that I could since I had the motor out. Now I have leak again at the case right behind the oil filter/oil cooler adapter plate is. Is this normal? Some of the case bolts were less than 100% tight but not loose by any means. I have only one to still check (right a top the oil drain(couldn't find a 10mm box end last nite). Its the closest to where the oil leaks out...but I suspect that tightening it up will do no good. It leaks about one drop about every 15-20 or so seconds after the engine gets hot...which is a lot. Is this par for a tired engine with 1400+ hours on it. It's a real PITA to pull the motor back off & replace the damn case seal again. Should I do the main crank again too. also do I need to maybe add a light coat of silicone seal to the paper gasket or just go with the spec gasket.??
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Old 03-12-2014, 12:25 PM
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Restrorob Restrorob is offline
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do I need to maybe add a light coat of silicone seal to the paper gasket or just go with the spec gasket.??

NO..... The gasket must maintain proper thickness for crankshaft end play, Go with Restro tip #56 and spray paint both sides of the gasket then install while still tacky. Once the engine runs up to temp that gasket will bond GOOD.

I never go into a engine without replacing the crank seal as well, On higher hour engines they get a new plastic governor gear too......
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Old 03-12-2014, 01:07 PM
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piston slapper piston slapper is offline
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Originally Posted by Restrorob View Post
NO..... The gasket must maintain proper thickness for crankshaft end play, Go with Restro tip #56 and spray paint both sides of the gasket then install while still tacky. Once the engine runs up to temp that gasket will bond GOOD.

I never go into a engine without replacing the crank seal as well, On higher hour engines they get a new plastic governor gear too......
Hmmm....The ole #56....Is there any spraypaint that worx better than others ?
Chevy orange....Ford blue...etc...?
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Old 03-12-2014, 02:43 PM
ricky86 ricky86 is offline
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There is an o-ring that seals an oil passage. It sits in a cavitiy in the block/sump. It seals pressure, so if it is hard, it will leak. You made no mention of it. It is in the same area of your leak. Maybe you missed it?
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Old 03-12-2014, 02:57 PM
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Hmmm....The ole #56....Is there any spraypaint that worx better than others ?
Chevy orange....Ford blue...etc...?
Personally I like the old High Tack from Permatex.
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Old 03-12-2014, 03:18 PM
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Originally Posted by ricky86 View Post
There is an o-ring that seals an oil passage. It sits in a cavitiy in the block/sump. It seals pressure, so if it is hard, it will leak. You made no mention of it. It is in the same area of your leak. Maybe you missed it?
Its leaking right at & just to the right of whats called the locating pin
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Old 03-12-2014, 05:51 PM
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Originally Posted by piston slapper View Post
Is there any spraypaint that worx better than others ?
Hot Pink !!!


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Originally Posted by Patriot Services View Post
Personally I like the old High Tack from Permatex.

That's fine, But if you ever have to remove a sump/pan that had the gasket painted you'll be

And...... Paint is alot cheaper......


Quote:
Originally Posted by PEVO View Post
Its leaking right at & just to the right of whats called the locating pin

For some reason that's the most common area where the gasket blows.......
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Old 03-13-2014, 03:08 PM
ricky86 ricky86 is offline
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Quote:
Originally Posted by PEVO View Post
Its leaking right at & just to the right of whats called the locating pin
The o-ring helps seal pressurized oil coming from the filter system. It is located right in that area. They get hard due to heat and then leak. That helps blow the gasket out. Did you replace it? 24 153 08-S is the part #.
I've never seen an engine, CH or CV that didn't use one.
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  #9  
Old 03-14-2014, 11:14 AM
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piston slapper piston slapper is offline
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Dont get me wrong...if it works ...its all good..

BUT...if Kohler wanted additional sealants on the gaskets...they would ask for it...
I put em' on dry..and let em' fly....BTW..if the sump isnt properly torqued..itll also cause it to leak ...
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Old 03-15-2014, 01:45 PM
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I'm always looking at better ways of sealing an engine. Hell if you follow the shop manual on engines with two piece rear crank seals they would leak from day one. Old cork type valve cover gaskets need a little sealant too. Having a true flat surface as well as even torquing is just as important too.
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