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J.R.
J.R., Small Engine Technician
Category: Small Engine
Satisfied Customers: 7445
Experience:  Owner of outdoor power equipment business, repairing all makes and models.
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i have a 17.5 hp kohler scott riding mower the engine has no

Customer Question

i have a 17.5 hp kohler scott riding mower the engine has no compression but if i slightly loosen the valves i have over 100 psi but the rocker arms slide off the valves
Submitted: 4 years ago.
Category: Small Engine
Expert:  Vince O. replied 4 years ago.

Vince O. :

Hello,do you have a service manual to help set the valves?

Vince O. :

Page 134 has some info on cyl head and rockers

Customer:

it has hydralic lifters

Vince O. :

I know

Vince O. :

Look over the service manual to see if it helps. It's a free download so you'll have it no matter what.It covers your engine and several others.

Customer:

it a model cv491s how do i download the manuel

Vince O. :

Click on the blue link above: CV

Vince O. :

Then save it to your pc.

Customer:

the manuel was of no help

Vince O. :

Ok,let me opt out so someone else can help you.

Expert:  J.R. replied 4 years ago.
The model CV491S should have hydraulic lifters. The lifter may not be bleeding off any and causing the valve clearance to be lost. I would pull the lifters out and clean them out good and let them drain out completely and see if that helps.
J.R., Small Engine Technician
Category: Small Engine
Satisfied Customers: 7445
Experience: Owner of outdoor power equipment business, repairing all makes and models.
J.R. and other Small Engine Specialists are ready to help you
Customer: replied 4 years ago.
would it be better to replace them if your suggestion works
Expert:  J.R. replied 4 years ago.
I would replace them if once you drain and clean them if the engine runs good. The problem may reoccur if you do not replace them.