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briggs33
04-16-2008, 08:47 PM
im having trouble wth a 25hp kohler command engine. one of the cylinders doesnt fire. i checked spark its perfect. not sure about the gas but on the plug it seems to have enough. i did compression check it and the bad cylinder had 110psi and the good had 120 but i but a liitle oil in the spark plug hole on the bad cylinder and it rose to 130psi so i think its the rings but not sure?model # CH15S SPEC # 68503 Family # SKH725U1G2RA any suggestion welcome!

Restrorob
04-16-2008, 10:36 PM
I'm going to guess the CH15S is a typo.....Remove the valve cover from the weak cylinder and check for backed off rockers or a bent push rod.

You can still get compression even though the valve(s) are not opening, 10#'s difference between the two is not enough to cause that one cylinder to be dead.

MowerMedic77
04-16-2008, 11:26 PM
Check for a bad intake gasket, spray carb spray around the manifold/head mating surface while its running and see if your cylinder picks back up. Have seen many units with spark and compression but running so lean on one cylinder as to give a dropped cylinder effect.

briggs33
04-18-2008, 05:00 PM
thats what it was it has two bent push rods along with the valve coming out.on the exhaust valve. i know a guy who is going to fix it so that taken care of but does anybody know the torque specs for this motor? i need the head the rocker arms side cover and what ever else that is torqued thanks

Restrorob
04-18-2008, 07:01 PM
Click on the below link, Enter your model number then download a complete service manual for your engine.


http://www.kohlerengines.com/service/manuals/index.jsp

caseymax
04-20-2008, 10:22 AM
Cylinder Head
Cylinder Head Fastener Torque
Hex Flange Nut - Torque in Two Stages ... first to (150 in. lb.)
finally to (300 in. lb.)



Head Bolt - Torque in Two Stages . first to (200 in. lb.)
finally to (370 in. lb.)