Oliver OC 3 Engine Work

Carsten S · Dec 5, 2023

I just picked up a OC-3. It is in decent condition, but it is a smoker! It uses a quart of oil pretty quickly (1-2hrs) and isn t leaking it.
This is my first time getting into fixing tractors, but have done a lot of motor work, mostly motorcycles.

My question is, where would an experienced person start? I figured it is either needs new rings or valve work. It seems to run pretty well, starts right up, but smokes after using a couple hours I lost a cylinder, likely to a fouled plug (but have yet to check)

Would worn valve guides cause the smoke? I cant seem to find any valve seals like I do in a bike.

Ericp351 · Dec 6, 2023

Basics- Determine how much you are pressuring crankcase when running- clean breather. Then Compression test- you know what cyl. to start with.

oliver90owner · Dec 6, 2023

Double posted.

This post was edited by oliver90owner on 12/06/2023 at 09:48 am.

oliver90owner · Dec 6, 2023

They would start by checking plugs, engine breathing. Compression check would likely confirm suspicions, if necessary.

J. Schwiebert · Dec 6, 2023

Valve seals would not be your problem as the engine is an L-head engine and the engine would have to pull the oil up into the combustion chamber. More questions?

Carsten S · Dec 6, 2023

Thanks Everyone, I will check the compression first and go from there.

Carsten S · Dec 29, 2023

Update: Compression tested 100-120 psi. 1/4” of sludge in the oil pan. I decided to go for it and pulled the head and the pistons out. The pistons and rings all look quite good actually. It appears to have been burning oil for some time based on the build up. When looking at the valves it appears to me that the intake valves for 1, 2, and 3 look dirtier than the rest. Would this indicate worn valve guides as a cause for it smoking?

millercodave · Dec 30, 2023

Carsten S said:
Update: Compression tested 100-120 psi. 1/4” of sludge in the oil pan. I decided to go for it and pulled the head and the pistons out. The pistons and rings all look quite good actually. It appears to have been burning oil for some time based on the build up. When looking at the valves it appears to me that the intake valves for 1, 2, and 3 look dirtier than the rest. Would this indicate worn valve guides as a cause for it smoking? View attachment 355

zoomed in the oil rings, they show that the expanders are rubbing on the cylinder wall. Oil ring rails are worn out. Pistons also show wear.

Oliver OC 3 Engine Work

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