Oil leak... again...

[ufgators68]

I have what appears to be a main bearing seal leak but it doesn't leak all of the time. It seems to only leak when I go on long drives or pull my 4 wheeler/trailer to deer camp. It's not a horrible leak or anything, just a few drops here and there.

I just had the valve cover gaskets and oil pan gasket replaced. It was oil leak free for almost two weeks and then Sunday, I pulled my 4 wheeler to camp. Looked under the truck Monday afternoon and there was little bit of engine oil on the oil pan.

Would a new PCV valve fix this? It was just replaced about 10k miles ago.

 

[Big Jim M]

First things first!

I have what appears to be a main bearing seal leak but it doesn't leak all of the time. It seems to only leak when I go on long drives or pull my 4 wheeler/trailer to deer camp. It's not a horrible leak or anything, just a few drops here and there.

I just had the valve cover gaskets and oil pan gasket replaced. It was oil leak free for almost two weeks and then Sunday, I pulled my 4 wheeler to camp. Looked under the truck Monday afternoon and there was little bit of engine oil on the oil pan.

Would a new PCV valve fix this? It was just replaced about 10k miles ago.

Highly likely the leak is coming from one of the leaks you had repaired a few weeks ago. First thing to do is FIND the leak to make sure what needs to be repaired.
If it turns out to be the rear main seal then YES a new PROPER pcv might stop the leak.
I buy my pcv's from FORD to make sure I get the correct one.
Big JIm

 

[rusty70f100]

The other place these motors can leak is the back of the lower intake. It might be worth a look.

 

[ufgators68]

Highly likely the leak is coming from one of the leaks you had repaired a few weeks ago. First thing to do is FIND the leak to make sure what needs to be repaired.
If it turns out to be the rear main seal then YES a new PROPER pcv might stop the leak.
I buy my pcv's from FORD to make sure I get the correct one.
Big JIm

I had those done at a highly reputable shop. I trust that the work was done correctly.

There is no oil on the engine block or bell housing, except for right around the engine oil pan. At least nothing that can be seen from above and by looking at the oil pan, and surrounding area, by kneeling down beside the truck.

 

[ufgators68]

Ugh... Just had the upper oil pan gasket replaced. Seems like when one leak gets fixed, another one springs up and they're usually worse.

I followed the advice above and replaced the off brand PCV valve with a Motorcraft valve. The guy that did the work, tested the PCV system and said it tested fine.

Since the PCV system is fine, what else could cause a pressure build up?

 

[Big Jim M]

Not ENOUGH pcv could be your problem. I have heard guys say using the pcv from a Chevy 400 cu in engine will pull more vac on the system and help to ememinate blowby pressure. In the past I have used two pcv's on one vehicle to stop built up pressure.
Big Jim

 

[ufgators68]

Not ENOUGH pcv could be your problem. I have heard guys say using the pcv from a Chevy 400 cu in engine will pull more vac on the system and help to ememinate blowby pressure. In the past I have used two pcv's on one vehicle to stop built up pressure.
Big Jim

How did you use two PCV valves?

 

[Big Jim M]

Ok

How did you use two PCV valves?

The engine in question here was a six cylinder Wrangler. It had two holes in the valve cover, one was for an air intake and the other was for the pcv. I simply added another pcv to where the air intake was and routed the vac hose to a unused vac outlet. It made the rear main seal leak stop completely. Stayed thataway till I finally sold it.

If one wanted to do the same to almost any engine it shouldn't be much of a problem to drill another hole in a valve cover..
Big JIm

 

[ufgators68]

Been driving for a while, to see if it leaks again. No leak but the brake pedal seems to be a lot tighter than it was.

Could some kind of vacuum problem cause the leaks?

 

[Stxrangerbumper]

If one wanted to do the same to almost any engine it shouldn't be much of a problem to drill another hole in a valve cover..Big JIm

I already do on mazda protege and yes its simple just remove the valve cover and drill the hole the right size and an attachment point has the air intake where I took my vacuum





The Positive Crankcase Ventilation (PCV) System cycles crankcase gases back through the engine where they are burned. The PCV valve regulates the amount of ventilating air and blow-by gas to the intake manifold and prevents backfire from traveling into the crankcase. The PCV valve should be mounted in a vertical position. On some applications, the PCV system is connected to the evaporative emission system. located on the underside of the hood or on the radiator cooling fan shroud

Been driving for a while, to see if it leaks again. No leak but the brake pedal seems to be a lot tighter than it was.

Could some kind of vacuum problem cause the leaks?

seafoam guys put it in brake booster line and voila ...he'll put good pressure in the system by cleaning line

 

[ufgators68]

seafoam guys put it in brake booster line and voila ...he'll put good pressure in the system by cleaning line

I did the sea foam thing a few weeks ago... before all of the oil leaks.

I didn't put any in the oil though.

 

[Stxrangerbumper]

ha ok yut

 

[ufgators68]

ha ok yut

Say what? Is that some kind of Canadian code or something?