kohler command pro vtwin noise

davbell22602

davbell22602

Lawn Addict
I have a kohler command pro vtwin 23hp on craftsman gt3000 50in. I'm thinking head gasket. Compression is 90 n 120psi. Replaced both plugs and coils have spark too.
 
Pull your valve covers off and make sure you don't have a bent push rod. That engine tens to have valve guide problems.
 
Cheap and nasty test which is not 100% reliable is to pull off the oil filler and dip stick after shutting down.
If it sends out smoke signals they are telling you to replace the head gasket.
 
the cylinder with 90 has a serious problem and the one with 120 isn't much better. the good thing about the command twin is there is no compression release on that engine. According to Kohler the minimum compression on that engine is 160.
 
ILENGINE said:
the cylinder with 90 has a serious problem and the one with 120 isn't much better. the good thing about the command twin is there is no compression release on that engine. According to Kohler the minimum compression on that engine is 160.
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Oh. I read in kohler shop manual that it's not recommended doing a compression test and cylinder leakdown test was better.
 
davbell22602 said:
Oh. I read in kohler shop manual that it's not recommended doing a compression test and cylinder leakdown test was better.
Click to expand...

except on the command twin. With the proper 160 psi compression a leakdown test won't operate properly because you use 90-120 psi for the test, and the compression in normal range will exceed that. So with 160+ leakdown will show in the green range.
 
Here's what I found when pulling the valve cover on the side that has 90psi compression. Plus broke off a valve cover bolt.

ForumRunner_20160525_120444.png
 
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