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Caterpillar 3208 Solutions This sub-forum is hosted by Mike Hohnstein who has been at this kind of thing for 50+ years now, guess I'm addicted. The saga has been all about progressively larger shop space since then. Honestly, never wanted to get into the CAT 3208's that were originally considered to be a throwaway engine but that's all that works in a FC in my world. Same thing with my Ford toter, that came with a NA, too much effort to hang in a 6, so been at it with the CAT V-8 for 20 years now. In reality you can get excellent life out of a CAT 3208 if it's built correctly. Post your questions about the CAT 3208 engines here and Mike will try to help you out.

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  #1  
Old 06-03-2022
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AvianMan AvianMan is offline
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Default Top side oil leak

My 86 3208T has an oil leak that I can’t track down.
The oil pools in the trough between the cylinder head under the manifold.

I took off the turbo yesterday, cleaned the top of the engine, replaced the ORings on the turbo while I had it out, then ran the engine. There was no oil on top, so I thought that may have been the issue. I took it for a drive and within a 1/2 mile or so the trough had a 1/4 inch of oil in it again. Even with it clean, I can’t see where it is coming from.

It could be from the turbo, but before I remove that again, is there something else that will leak oil into the center like that? It isn’t coming from the valve covers, and it doesn’t look like it is coming from the air compressor. Is there an oil feed line to the injector pump?

I am open to ideas - I have been trying to find this out for over a year.
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Old 06-03-2022
Mr. Bill Mr. Bill is offline
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the rear of the injector assembly has 2 o-rings on the bottom between 2 bolts that hold the governor assembly housing to the valley....look there.
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Old 06-03-2022
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No oil @ the o-rings, there is a plug under the pump in the oil galley, but unlikely that would be leaking. Probably the O-ring where the pump fits into the front of the engine block. Requires removing the pump to service, or the flex oil line that feeds the air pump.
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Old 06-03-2022
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remove the injection pump and send it to Mike H.
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Old 06-03-2022
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If it is an Oring between the pump and the block, I’m sure I won’t need to send it to anyone.
Getting it off is probably the most difficult part.

I am going to see if I can isolate the direction the oil is coming from.
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Old 06-03-2022
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How about the oil pressure line going to the air compressor?
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Old 06-03-2022
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or the flex oil line that feeds the air pump. Post 3
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Old 06-04-2022
Ssmarinediesel Ssmarinediesel is offline
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Camshaft retaining bolt washer.
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Old 06-04-2022
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Quote:
Originally Posted by Mike Hohnstein View Post
or the flex oil line that feeds the air pump. Post 3
Sorry,i missed that in your post,but would be the first place i look.
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Old 06-04-2022
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When my pump was leaking from various spots.....when looking down in the valley ...I would see a liquid that was a little thick (like oil) in the valley. Turns out it was diesel fuel,which when heated gets thicker....

Most of the leak was from the fuel inlet at the front of the of the injection pump. there is a o-ring under the lock nut that holds the inbound fuel elbow in position. I had a throttle shaft seal also....but because of the electric lift pump and the leak being at the very front and running down the front of the pump...it was hard to find. I don't know if your engine has a lift pump in the rear...(Mike H. would know) but if it does ...just turn the ignition on with out the engine running and start looking.
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Last edited by Mr. Bill; 06-04-2022 at 04:58 PM.
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