Engine Oil Leakage - Zero or How Much

[Juho]

We have a Yanmar 38hp, model 3JH2E, 19 years old. No leaks. Does not consume oil.

[jpendoley]

Perkins 4-108 leaks through rear seal at a horrible rate-pint every 8 hours of running. Am told it's incurable-even with new seals. Would love to learn otherwise and would love to repair. Otherwise love the engine

[Cadence]

Originally Posted by kelbylinn

We have twin 453 Detroit Diesels that were both rebuilt about 500 hours ago. After rebuilding, we had spot leaks in pan on my drip pads. We replaced the valve cover gaskets, and they are now dry. I've heard that is almost a first for old Detroit Diesels to be dripless...

Old GMs and Harleys are supposed to leak. I would like to know that it isn't a main bearing seal anything else should be a simple fix or put a wick and a drip cup there if your lazy.

[ramblinrod]

Originally Posted by jpendoley

Perkins 4-108 leaks through rear seal at a horrible rate-pint every 8 hours of running. Am told it's incurable-even with new seals. Would love to learn otherwise and would love to repair. Otherwise love the engine

Loving a leaky engine is kinda like loving a cat that craps on the carpet every day. I know some do, but it's not for me. ;-)

[wunderluster]

If you think you can't live with a leaky engine just get a Perkins 4-108. You'll either learn to live with it or go insane, your choice!

I know people who have changed the rear seal just to have the same leak within 6 months. Two mechanics told me they can fix mine but it won't last. So, I live with it. The engine runs great.

[four winds]

Originally Posted by jpendoley

Perkins 4-108 leaks through rear seal at a horrible rate-pint every 8 hours of running. Am told it's incurable-even with new seals. Would love to learn otherwise and would love to repair. Otherwise love the engine

It's my understanding that when the pan gaskets and seal are replaced that folks mistakenly cut off two small tabs of material that are supposed to be tucked in and remain. Which ensures a proper install and no leaks.

Some posts here support the fact that it can be done properly.

The "it's supposed to leak" idea must be promoted by those that do it wrong.

Also, over tightened pans bolts are a common mistake for some engines. Don't know squat about a Perkins beyond what I've read. But possibly when removed the pan flange should be carefully checked and trued.

[brianlara 3]

Originally Posted by jpendoley

Perkins 4-108 leaks through rear seal at a horrible rate-pint every 8 hours of running. Am told it's incurable-even with new seals. Would love to learn otherwise and would love to repair. Otherwise love the engine

As an ex-professional can I suggest that you possibly have a plocked PCV system.
Even 4.108 rear mains aren't usually as bad as yours.
Up to you !!!!
Check that your crankcase is breathing efficiently.

[dneve]

Owned a Hatteras 58 with 8-71s which leaked a lot like most older Detroits but these engines never failed to get me home. Now I have a Perkins 4-108 with 2500 hours built in 1986 with no rear main seal leaks but numerous very small leaks which are easy to wipe down and keep absorbant cloths under the engine. The Perkins runs great so I accept the leaks in exchange for reliability.