Jd 60 misses at idle follow up

62050

Member
I removed the intake and exhaust manifolds and did see anything wrong there, filling one intake passage at a time with gas and checking for leeks not finding any I pressureized the intake to be sure. Should be ok. I took some pictures of the head after it was off.
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I am curious why you pulled the head.

Can you show us pictures of the mating surface of the intake and head?
 
Me too but it does show evidence of compression leaking between the cylinders and maybe some at the one edge. Wonder how the valve seats look ?
Are those pits in the cylinder ? or is that a reflection of the piston ?
 

It just my eyes or is there a nasty crack in a bore ?
Darn, I was 99.9% sure there would have been a leak in the intake manifold , between the manifold and head or across the valve/seat.
Valve spring pressure ?
Do you have a degree wheel and a dial indicator to measure cam lift ?
 
Intake gasgets looked fine, matings serface looked fine. exhaust mating is a little pitted but ok. the next step was to remove the head. Took it into a machine shop to get checked out. Yes there is some pitting on cylinder 2 and looked like some leakage between the two cylinders. Time to clean some parts and wait for the news on the head.
 
The block has been sleeved and I'm betting the rings are done . The valve seats could be loose and leaking ,the head gasket shows signs of leaking between the cyl's. and looks like the head gasket has slipped some on no.1 side . The no.1 side looks to have been blowing into the water jacket . Looks like she's burning oil and/or been eating a lot of dirt, or pre. ign. Also wonder if the sleeve has been leaking water. Also had a 60 that wanted to run on one cyl at idle and finally found the throttle disk for that side was cocked and not letting that side get any gas at idle to run. Enough said but you asked .
 
The block has sleeves because its a power block.

That being said, you are probably correct on the rings being done. Most power block pistons I have seen (whether from A/B/G/60/70) have the top ring groove slopped out to some degree. When my 60 had a power block in it, the top ring grooves on both pistons had probably .030-.040 slop in them, and the top rings were broken. Smoked like crazy out blow by tube, but not at all out exhaust pipe.
 
Just a follow up to let everybody know that the problem was in the head, had to replace it.. Along with the cracked flywheel. So thank you to everyone.
 

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