Kohler CV730-0027 Locked up, motor won't turn.

gregpApril 29, 2008

Okay, before I start, I will say I have read the many posts regarding a factory problem with the head gasket on the #1 cylinder. Recently, my engine shut down after 10 minutes running. Since then, the engine will just spin over but will not start. I have gone through all of the troubleshooting materials I can find and the fuel and spark do not seem to be a problem so I decided to try a leak-down test. When I tried to line up the #1 cylinder up for the test I charged it with air (using the leakdown tester) but did not have it TDC, so I tried to turn the motor by hand to line it up but now it is completely locked up. I checked all 4 valve and they appear be okay, but I have no idea what has this motor locked up. I was on my way to troubleshooting a possible blown head gasket but now I seem to have another problem. HELP!!! :o(

Thanks for any help!

Greg

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tomplum

You didn't say what made you suspect the headgasket condition. Can you not turn the engine either direction? With both plugs pulled? Possible starter gear wedgied and locked? I have also seen the flywheel on these lose their magnets and lock into the stator. I'm hoping that you kept oil in it- as they will chuck a rod if they get run real low. Maybe you do have a rod gone bad and when you put pressure to that cylinder- you pushed the piston against the busted rod. How much more good news can you stand. . .

    Bookmark   April 29, 2008 at 6:03PM
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gregp

I forgot to mention... that when I try to turn the flywheel manually (it is not completely frozen) it does move back and forth about 2 in. / hope this helps???
Thanks,
Greg

    Bookmark   April 29, 2008 at 6:17PM
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gregp

Thanks for the reply, I'll try to give as much info as I can... I began to suspect the head gasket due to heavy smoke and a known problem with this particular model; I definitely believe the lockup is related to when I charged the #1 cylinder with air (I could turn the flywheel manually prior to that; the flywheel now will only turn about 2 inches back and forth; and yes, there is oil in the engine... hope this helps & Thanks!

    Bookmark   April 29, 2008 at 10:30PM
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tomplum

It is good that there is oil in the engine. Pulling the shroud to confirm the starter, possibly the flywheel to confirm the things from the last post is your next step. Seizing after air pressure makes me think issues are internal- but confirm external things first.

    Bookmark   April 29, 2008 at 11:54PM
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dewaynep

My guess is that you threw a rod. Most likely, when you charged the cylinder with the leakdown tester, you pushed the piston down the bore and it is now in the way of the broken rod, hence you can only turn the engine a couple of inches either way. It was free to turn before because the piston was at or near the top of the bore and the broken rod didn't get in the way.

    Bookmark   April 30, 2008 at 12:12PM
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gregp

Today I checked the engine with both plugs removed... still the same... the flywheel turns back and forth about 2 inches and seems to stop abruptly (metal to metal stop)... having said that it looks like Dewayne is on the right track... I will probably be pulling this thing apart next week... I have downloaded the kohler service manual (never been inside a Kohler before) anything particular I should watch for???

    Bookmark   April 30, 2008 at 7:23PM
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tomplum

"anything particular I should watch for???"

A lucky rabbit's foot?

    Bookmark   April 30, 2008 at 7:31PM
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tomplum

Actually, the last one of these I had that blew had cracked the block. It's worth a look over before you tear it down.

    Bookmark   April 30, 2008 at 7:40PM
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gregp

Thanks DewayneP...

I pulled the enging apart today and your guess was on the money! The engine threw a rod... the rod was then pulverized inside the engine causing catastrophic damage to the inside of the block. When I opened it I found a large handful of 1/2 inch size metal chunks strewn throughout. The oil pump was destroyed, the block at the base of the cylinder bore was missing a chuck of metal the size of a silver dollar... Nothing I can do with it... I now have to pony up $1000 for a new motor. If anyone has similar problems, I will be glad to help troubleshoot... My experience with this engine has grown ten-fold over the last couple of days. I don't wish this on anyone but will help where I can.

    Bookmark   May 2, 2008 at 2:19PM
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dewaynep

Glad I could help, not glad I was right. You may want to search to see if you can repower that with something else (tecumseh or Briggs) or even a used engine?

    Bookmark   May 2, 2008 at 3:24PM
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hawker1(C. FLA)

I wonder why people still refer to the Koehler as the preferred engine over a Briggs? I've had Briggs all my life and never recall any problems. Upgraded to a Koehler in my GT5000 and think it's really sub par performance and then the gasket blew. Not by choice my new Gravely has a Koehler also, but I don't like it.

    Bookmark   May 3, 2008 at 2:05AM
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bushleague(MA)

I don't understand the new Kohlers. The head bolts stretch, you lose the head gasket, and break a rod? I just picked up a mint Cub Cadet 1018LT off of Craigslist with a CV492S (18 hp Command) and a broken rod. I pulled the engine apart and the head gasket was intact, the bore and main journal are mint, however it trashed the camshaft. At 125.7 hrs on the Hobbs I sent Kohler an email who said that they might play if I have an authorized Kohler dealer look at it. Just a thought in your case. It sounded as if they weren't hard and fast on the two year warranty.

    Bookmark   May 6, 2008 at 9:06PM
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