2510 diesel engine problems

Ray IN

Member
So I took a chance and bought a "freshly rebuilt" 202 diesel and put it in my 2510. Ran good but I noticed some valve tapping noise. Thought it was due to break-in oil maybe. Anyway, after about 10 hours it starts running on 3 cylinders. Turns out it broke a valve. There is one slight valve-shaped impression on top of all the pistons. What are possible causes of piston hitting valves? Could the pistons still be usable? Should have just overhauled my old engine cause now I guess I get to do this one.
 
Welcome to the world of trusting others.

I would not want to reuse a piston that had a valve drop on it, and would really be careful of the rod also.

I do not know why the valve broke, it was probably just its time from fatigue, or someone nicked it during the rebuild.
 
I just realized you said all the pistons had marks.

Again, I would not reuse those pistons and be cautious of the rods.

The only way for interference is the valves are too far down or pistons too far up, or way out of time if it is interference engine.

Is there a recourse on the rebuilder?
 
I do not know much about the 202, but a guy I work with just had a similar issue on his race engine. It didn't make it 300ft before the valve broke. Turns out the pistons had excessive rock which allowed them to hit the valves. I wish you good luck on repairs.
 
Just a thought TX but could the timing be that far off and the tractor still run? I agree and would not use the pistons over. Someone may have done the valves wrong or maybe the block was planed and they took to much. I wonder if they replaced the wrist pin bushings in the rods when overhauled? It could be one big issue or maybe several smaller ones that add up. If you go with a different engine a 219 or 239 will really wake up a 2510. Ours has a 219 and I just bought a 2440 with a 239 replacement engine and it really runs good. Tom
 
(quoted from post at 12:42:38 07/24/16) Just a thought TX but could the timing be that far off and the tractor still run?

I think with timing being off it could still run BUT I could be wrong. I'd certainly advise checking timing on a purchased engine that pistons hit valves.
 
(quoted from post at 12:42:38 07/24/16) Just a thought TX but could the timing be that far off and the tractor still run? I agree and would not use the pistons over. Someone may have done the valves wrong or maybe the block was planed and they took to much. I wonder if they replaced the wrist pin bushings in the rods when overhauled? It could be one big issue or maybe several smaller ones that add up. If you go with a different engine a 219 or 239 will really wake up a 2510. Ours has a 219 and I just bought a 2440 with a 239 replacement engine and it really runs good. Tom

Let's go with a 276 , should be good for an easy 90HP at 2300rpm wihout smoke .
 
I would be FAR more worried about reusing the valves that tapped the pistons than I would be about the pistons, if there's just "one slight valve-shaped impression on top of all the pistons".

I've torn down lots of diesel engines over the years for overhauls and found lots pistons that were pretty beat up on top from a previous problem that continued to function 'til they otherwise wore out.

ONE example would be Ford 6.9 or 7.3 diesels, or GM 5.7, 6.2, and 6.5 diesels that had beat up piston tops from broken glowplug issues in the past. Some of those get pretty NASTY, and don't affect the life of the piston.
 
i did 7000 ford once got all together started it up sound bad took head off valve marks on all the pistons what happened was the key in cam shaft had sheared turned just enough to put it a slight bit out time
 
I'm always one to try and overhaul or repair and known good engine or starter etc. verses taking a chance on a reman ?
Did the place you got it from offer any sort of warranty ? Even if they did it now may be void from tearing it apart without prior authorization.
 
OK, there are a lot smarter guys on here that have already posted but what came to mind for me is did someone shave the head or block too far? That happened to a friend of mine on an IH engine. He had to shave the dome of the piston to get clearance. Paul
 
I bought it from a classified ad on this site. The owner said a john deere mechanic did the work in his spare time. I even talked to the mechanic, and they had receipts for many of the parts, pump bebuild, etc. But he came down on the price pretty quickly--I guess that should have told me something was wrong.
 
I agree, I would find a 239 and it would make it a completely different tractor. Our 2520 with a 239 would easily out run our cousins original 2510 going up hill with loaded silage wagons.
 

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