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JD40 engine troubles

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JD40C

05-12-2002 22:19:55

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John Deere 40C crawler, s/n 71079, 1955 model, 100.5 cu/in twin cylinder engine.

Was running the JD40c crawler around yesterday for a couple hours moving farm equipment and everything was running fine. I parked it for a couple hours, and when I was ready to head home, fired it back up again. I noticed an intermittant knocking sound coming from the engine area. Shut the crawler down and restarted it again. This time the knock didn't stop and matched the speed of the engine. Oil pressure has been in the green as has the water temperature. The engine still runs like both cylinders are firing well, and sounds healthy except for the knock. I haven't run it since the knock started (don't want to go and make it worse.)

Are we talking a broken rod bolt or something? Any ideas where to start looking?

I'm working on dropping the skidplate (what a chore!) with plans to drop the oil pan and have a look. Having never dealt with one of the JD vertical twin engines before, I was wondering if there are any specific areas I should look at. I did engage the PTO and spin the PTO shaft with a crescent wrench, but didn't notice anything amiss (major knocks or anything.)

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Clooney

05-13-2002 03:46:45

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Re: JD40 engine troubles in reply to JD40C, 05-12-2002 22:19:55

JD40C, diagnosing an engine knock without hearing it is kind of iffy at best.
~Just a couple of thoughts to start you off...Make sure the carb didn't leak fuel into the crankcase during shutdown [kind of difficult but not impossible on a 40]..Diluted engine oil can really make them hammer.
~Does the knock sound better after the engine sits for 8-10 hours +, & is run with cold oil in it? [if so suspect bearings]
~Can the noise be changed by pulling either sparkplug wire.
~Either use a long hose, long screwdriver, or buy a cheap mechanics stethoscope & probe around to see where the knock originates from..Maybe it is coming from a pump drive or clutch area...
~Let us know what you find or if you can pin point the origin a little closer let us know & we will try to help a little more..

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