Small Engines (Lawn Mowers, etc.)/kohler 25 hp engine
reddog wrote at 2014-06-18 14:05:00
This guy dont know what he is talking about. They are hydraulic lifters and there is no adjustment. The problem is the engine is hot and when you shut it off the valve is open and the valve seat drops out and when you go to start it up again the valve dont close all the way and pushrod falls out and hits rocker arm in another spot and bends. This has been a problem from way back when we switched to aluiminum blocks.
Fix = Remove head and make sure seat is reseated back in head,use center punch and go around set and peen it in at seat and aluminium part of head and then lap valves in to make sure you have a good even set or seal.Have done this to two engines and have not had a problem yet.