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Garden Tractors Discussion Forum

Kohler small engine

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Jay Fraiser

07-15-2012 10:08:16

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Hi all -
I have a Kohler 25 HP (CV724S) in a Craftsman GT 3000 and yesterday while mowing, I stopped to empty the grass from the hopper and it would not restart. When the ignition is engaged, the starter slams into the fly wheel as it should but only rotates a fraction of a degree. There is a new battery, fresh gas, the unit was operating perfectly at the point I shut it down. Removed starter and it tests OK. With plugs removed, the engine can be turned over with a 1/2" socket and drive by the main bolt on top. While it does turn and can eventually br turned 360 degrees, it seems tight, even with the plugs out. Any idea what could be going on here? Thanks in advance.


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07-16-2012 15:43:18

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 Re: Kohler small engine in reply to Jay Fraiser, 07-15-2012 10:08:16  
These are famous for the valves seizing. Take off the vavle covers and watch the valve to make sure they are free. Check push rods for straightness. I lot of them get so loose they fall out of the rocker. I have known these engines to push the valve guide out enough to keep the valve from closing and the push rod fall out.

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07-15-2012 16:13:10

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 Re: Kohler small engine in reply to Jay Fraiser, 07-15-2012 10:08:16  
Some Kohler 25's have a bad rep, for seizing. If It were mine, I would try to see what is causing the lock up. Easiest place to start, and from what I've heard, the most common failure point of failure was valve related. Pull the valve covers, and see if a valve is hung up, or off it's proper train. If it's not that, covers are easy to put back on.

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El Toro

07-15-2012 12:55:46

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 Re: Kohler small engine in reply to Jay Fraiser, 07-15-2012 10:08:16  
See if you can borrow a borescope light. Remove the plugs and take a look inside the cylinders to see if they're scored. You may also be able to rent one. Hal

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07-15-2012 10:19:45

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 Voltage drop test. in reply to Jay Fraiser, 07-15-2012 10:08:16  
There should be some resistance from the valve springs when turning the crankshaft with the sparkplugs. More from compression with the sparkplugs installed.

If gas leaks thru the carb into the cylinder, it will cause a hydrolock and the starter will jam. You would see gas squirting out the emprty sparkplug holes tho.

Push rod being out of place or valves not being adjusted properly would cause a engine lock too.

Are any of the safety switches bypassed? This sounds like when trying to start when the blade is engaged. Make sure nothing is jamming the belts under the engine.

With the sparkplug removed, is the starter able to turn the crankshaft?

Search Youtube for voltage drop test instructions. You will need a multimeter. Basically, you test voltage drop at every connection point in the wiring. Very simple test. You might be getting some volts to the starter but not 12 volts. Possible cause is faulty soldenoid.

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Tom Arnold

07-15-2012 10:18:12

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 Re: Kohler small engine in reply to Jay Fraiser, 07-15-2012 10:08:16  
How good have you been at keeping the oil level in the engine at the FULL mark at all times?

It certainly sounds like an oil starvation issue to me.

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