Rear main seal leak? *DUW*

[BlackVert]

Is this evidence of a rear main seal leak?

 

[1TallMF]

Thats a deffinate YES. That sucks dude

 

[JJ95GTID]

It may not be. When I pulled the intake off last time I found the gaskets I used split in half and leaked oil out the back. I thought for the longest time I had a rear main seal leak. When I reinstalled the intake I used a thick bead of silicon instead of the supplied gaskets and the leak went away. All that nasty oil around the flywheel pan cleaned up after a couple months.

 

[1TallMF]

Good point. He'd have to have a look at the top of the bellhousing to see if its full of oil there, but it looks to me that its coming from a spot exactly the size of the RMS, and it doesn't look like its running down the sides of the bellhousing.

 

[BlackVert]

ok more pics coming ...

 

[BlackVert]

now i'm thinking it might be from cylinder #8 ... i just got the header off

 

[blksn955.o]

damn, I would almost say the whole pan gasket. But I would almost say like 90% rear main, and the rest other stuff from the looks.

What was the oil pres.?

Mine has a slight rear main leak (just alittle haze right at the bottom not enough to drip or leave a spot) but also has 65-70psi cold startup and 55-60psi warm with 70-75psi at anything 2,000-2,500rpm warm on a STD. volume pump . With that kind of numbers I would hope something had a slight leak from all that pres.

 

[newmuscle]

Yea had the same looking leak it was coming from those cylinders

 

[BlackVert]

welcome newmuscle :SNSign: what did you do about it?

doesn't it look like it was coming out of the spark plug hole ... ?

would that indicate a blown/broken ring?

I'm pulling the heads next ...

 

[SWYZ721]

Our rear mains always seem to ooze at least a little bit.

 

[8950HO]

Check your PCV system,especially the metal screen under the PCV valve rubber grommet.

If it`s plugged up and restricted,crankcase pressure builds up forcing oil past seals.

 

[tjh566]

yeah, the rear-mains leak alot on our cars, mines leaking a little, its comes with the miles and the years, its minimal so I'm leaving it alone until I can afford a new motor

 

[BlackVert]

here is the head ... #8 looks bad

 

[BlackVert]

so ...

- the compression test said 165 for #8, the others were around 150

- there is evidence of oil leaking from the #8 spark plug hole

- the #8 compression chamber looks like it looks.

What does it mean? i'm thinking rings (again)

 

[iwashmycar]

looks that way.... thats a bummer tho

mines been leakin some also, but still runnin like 48-54 on the oil press gauge

 

[diablostang]

To me, it says screw it, and get a 418 stroker

 

[BlackVert]

heh ... don't give me any ideas. i might be refinancing my mortgage anyway and getting like $150,000 cash out ...

 

[S/CBlack95GT]

My rear main leaks a bit, but it never drips so I dont worry about it. You could take the engine apart and replace all the seals/gaskets if you are bored. If it doesn't drip I wouldn't be concerned though.

 

[BlackVert]

well let me put it this way, i lose a quart every tank, about 200 miles. it's going somewhere

 

[blkcobra50]

The oil in #8 could also be from the valve seals letting oil get into the combustion chamber. Looks a little excessive with oil chasing spark plug threads. The higher compression makes me lean more in the way of valve seals because if the oil was getting past the rings i would think the compression would be a bit lower.

Also looks like a combo of rear main and oil pan gasket leaks. my rear main leak was not as bad as yours looks but that is what pushed me to build motor!!