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Old 03-16-2013, 03:28 AM
mowermankevin mowermankevin is offline
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Join Date: Nov 2007
Location: Burleson,Texas 76028
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Kohler CH-25S Crankcase Pressure Build-up

Just took an engine down for valve-job,lifters, head gaskets,crankcase breather reed & gasket, put it back together and runs great except it's blowing oil from the crankcase breather hose into the air filter housing. The owner said it started doing this last summer & and it will flood the air filter with oil after an hour of run time. Pulled it back down to check for blocked oil passages, cylinder leak down, the usual culprits, any ideas ? This is a 3100 hour engine & Spec#PS68521. I told him back in 1996 if he got a couple years out of it.... Thanks all in advance
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Old 03-16-2013, 06:38 AM
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piston slapper piston slapper is offline
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If the reed valve was installed properly...
You have a ton of blowby on the piston rings..
A fresh set of heads would make weak rings blowby even worse..
Do a leakdown test...
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Old 03-16-2013, 09:10 AM
mowermankevin mowermankevin is offline
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Location: Burleson,Texas 76028
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P Slapper, thanks for the reply, we did leakdown last night & #1 cyl. intake valve is leaking, never had a bad valve job outta this machine shop for years until now. Put the engine in the truck to take back to the shop this A.M. to see what they have to say. Any more possibilities out there? Thanks Y'all
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Old 03-16-2013, 09:40 AM
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Landrus2 Landrus2 is offline
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Hey Kevin If your reed assembly is good.I agree You will need to replace your rings. A valve not sealing will not affect the blow by.
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