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Fruita CO | The 8650 engine had a lot of upgrades, notably the crank-driven oil pump, also more meat between cylinders, to stop the head gasket blowing out between cyl. That was the fatal flaw in the 8630...early 619 was a bored out 531, & the liner flanges almost touched each other. The later 619, like in a 5830 chopper, wasn't that bad an engine, removed from the stress of being a frame member.
Local guy was using an 8630 plowing snow in the oil field, head gasket let go, & JD put him in a new 8650 engine...10 hr. later, in 4-5 ft. of snow, at 9000 ft., the oil filter popped open, seized the new engine...JD ate that too, since the filter came with the new motor...he decided not to push his luck any farther, & sold it.
Edited by ronm 6/11/2009 15:51
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JD 8650 vs.8640-8630
