bent push rods

mark goyings · Mar 23, 2012

i rebuilt a case 560 diesel engine it run good for about 100 hours then all sudden it started dending push rods.what is the problem?

Paul from MI · Mar 23, 2012

Is it only on one cylinder or on all of them? Might be a broken valve spring?

mark goyings · Mar 23, 2012

all of them

Paul from MI · Mar 23, 2012

I assume you've checked the valve adjustments each time before turning the engine over. Are any of them not staying tight? Do the valves still move freely in the head? Are the rocker arms getting oil? What head work was done in the overhaul, anything to cause valves to tighten up, maybe knurled guides or replaced guides and left them too tight? I have had exhaust valves that were too tight in the guides hang up.

WJD · Mar 23, 2012

Something is out of time. Pushrods are designed to be the "fuse" and bend first when something goes wrong.
Are you sure the engine has not been in an overspeed condition by a heavy load pushing the tractor down a hill?
Too much starting fluid can overspeed an engine too.
If overspeeding is not your problem I would remove the front (timing) cover and check for a sheered key on the crankshaft or cam gears.

showcrop · Mar 23, 2012

Go down to the Ford forum and post about it for Soundguy. he had it happen and did a lot of research into it.

504 · Mar 23, 2012

I would really look at an oiling problem. Make sure the rockers are oiling, could be a plugged oil line.

Tom-NorthCenTX · Mar 24, 2012

Please tell us exactly what head work you had done. Tom

Anonymous-0 · Mar 24, 2012

Overspeeding the engine will only bend the exh pushrods.
If all of them are bent something else went wrong.
Later Bob

bent push rods

mark goyings

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Paul from MI

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mark goyings

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Paul from MI

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WJD

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showcrop

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504

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Tom-NorthCenTX

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Anonymous-0

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