Tractor Update

[oldmanriver]

Got the head off the 5000 and valves look good . there is no scaring on the cyclinder walls I think the rings must be stuck there is a little play in 2 of the pistons and if you move the they don't spring back in place . Does this sound right ? Still have to pull the oil pan off to get the piston out , What would cause the piston rings to stick ? The problem was blowing oil out the muffler .

[oneokie]

Stuck piston rings are most often caused by carbon build up. Are you sure it was oil blowing out of the muffler and not unburned diesel?

Has the tractor been run for long periods of time at idle or low load? Either will cause unburned diesel to be blown out of the muffler.

[oldmanriver]

Originally Posted by oneokie

Stuck piston rings are most often caused by carbon build up. Are you sure it was oil blowing out of the muffler and not unburned diesel?

Has the tractor been run for long periods of time at idle or low load? Either will cause unburned diesel to be blown out of the muffler.

it set for a few years before i got it was used once a year t o bush hog about 7 acres started to blow oil last year when i hook it to the round bailer has got worse this year . removed the exhaust manifold and the oil was coming out of 2 of the cyclinder .

[Old Vet]

Sounds like a cheap repair. Pull all the pistions and clean them and put in new rings and bushings.

[agmantoo]

Blowing oil out the exhaust is caused by the exhaust valve stems leaking oil into the exhaust gas. Valve guide seals are shot. Oil getting past rings will get burned. Would this tractor start easily when cold before the teardown?

[oldmanriver]

Originally Posted by agmantoo

Blowing oil out the exhaust is caused by the exhaust valve stems leaking oil into the exhaust gas. Valve guide seals are shot. Oil getting past rings will get burned. Would this tractor start easily when cold before the teardown?

yes it would start easily but It had a valve job last year and that didn't help . also getting a lot of blow back at the oil filler cap ??

[indianheadranch]

Originally Posted by oldmanriver

yes it would start easily but It had a valve job last year and that didn't help . also getting a lot of blow back at the oil filler cap ??

If the pistons are moving inside the cylinder, i would say the rings are stuck it will also cause the blow back thru the oil cap, if it was me and going that far i think i myself would do an inframe on the engine sleeve it and ring it depending on the conditions of the pistons, what i mean by that is that a ring was stuck or wore deep enough into the piston to rub the cylinder wall, the problem your mentioning could also be the reason it was parked for sometime. Good luck on your endeavors but short changing an engine want help in the future,

[agmantoo]

Blow by is another issue! It is too late now buy a compression test would have told you a lot. How many hours are on the engine? Did the oil pressure rise and fall as the engine went from idle to PTO speed? It does appear that an inframe overhaul is in order.

[oldmanriver]

Will get the pistons out today I hope Money is tight right now so may have to make do with just a ring job The rings priced at 42 dollars a hole plus needs the head and pan gaskets . Cyclinder walls look good top of piston look good the tractor only has 3500 hours on it .

[agmantoo]

With those hours the engine must have run hot to create a problem. I would have expected the engine to give good service for at least 8000 hours. If you reuse the sleeves remember you need to hone them.