G1000 engine knock

S J P · Jun 15, 2013

Had the G on the grain auger cleaning out a bin. Came out of the bin and the LPG engine was knocking pretty bad. Oil and coolant all good. Starting the engine up cold it sounds OK but in 5 minutes it is really clattering again. Any ideas out there? Thanks

Moline_guy · Jun 16, 2013

We had a G705 diesel that would get a stuck valve if it idled around too much, made a knocking noise. If i remember right we were able to tell which set it was coming from and took that valve cover off and sprayed up the valve with wd40 and tapped on it with a hammer and it would loosen up.

We also had a few diesel G1000's that broke the top third of the piston and they would knock, but usually if that was the case it would be a severe knock.

cleddy · Jun 16, 2013

My knock on the M-602 did not turn out to good. I was hoping for a stuck valve-broken spring or anything but it was the back rod bearing. I had good oil presure and level and while antifreeze was leaking in oil it still looked like pretty thick oil and should have worked but I guess I pushed it to the limit as all the bearings were showing thier wear. Note - Noise always seem like it was from the top of the engine and when I got the piston out it was smashed clean on top around valve opening so you can't go by what you can't see.
Made a second mistake of running it more after knock was noticed and ruined the crankshaft which could have maybe been avoided with a simple tow back home.

A M-602 has a access hole where the Oil filter goes which I could reach in and feel the play at a certain place in rotation. Pulling the oil pan is not all that difficult.

I sure would not run it to much trying to figure it out. I found a good used Crank shaft but things are adding up pretty quick on the repair. The bigger the engine the more expensive parts are. Cleddy

G1000 engine knock

S J P

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Moline_guy

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cleddy

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