Hard to find oil leak -GMC 2.8L - need help

#11

The problem with the distributor shaft seal was also a problem on the newer
2.8s and 3.1s

"shiden_kai" <v-l-m (AT) hotmail (DOT) com> wrote

Quote:

CNB wrote:
Mike,

The leak that I see (or have felt) is definately coming from the top
rear of the motor, and runs down onto the front of the transmission,
and onto the hot exhaust pipes below, where it sizzles and smokes
like all get-out. It actually pools up in various pockets behind the
manifold area. I can wipe it clean, but after a few minutes of
running, it's pooled up again. This has caused a huge oil slick down
the back of the motor and onto the transmission and oil pan.

You may have an intake gasket leak, but it was/is very common
for these engines to leak from the distributor shaft o-ring seal.
The o-ring seal sits right above an oil gallery and is exposed to
full line pressure. You might want to start by removing the
distributor and checked the seal. If it hasn't been changed for
a while, you will probably find something that is hard and
cracks apart when you remove it. You can get the new updated
seal from GM, it is a brown/tan color. This new one does not
seem to deteriorate like the old seals did.

Ian

#12

"CNB" <cbrown_nospam_ (AT) bulloch (DOT) net> wrote

Quote:

I just called a local machine shop where I was quoted $375 for a manifold
gasket R&R job. That actually sounds a little low to me, since I have paid
almost double that just to replace the VC gaskets (before doing it myself
a
second time).

Heh, if I'd paid $700+ for a valve cover gasket replacement, I certainly
wouldn't admit it publicly. Sheesh........

#13

Hairy,

I looked back at my receipt and it wasn't nearly as bad as I'd thought. The
$700 included many other things including a compression check ($90)
replacement of both front brake rotors ($70) and replacement of many vaccum
hoses, not to mention the cost of all the parts.

The actual labor charged for the valve cover replacement was $240.

Now the proposed $375 for the manifold gasket replacement seems to fall
right in line where it should.

Casey

Quote:

Heh, if I'd paid $700+ for a valve cover gasket replacement, I certainly
wouldn't admit it publicly. Sheesh........

#14

Thanks for the tip. I did see the place where the shaft goes in the block
and all appeared dry in that area, but if and when they do the manifold
gasket I'll get them to change out the distributor seal as well.

Casey

"shiden_kai" <v-l-m (AT) hotmail (DOT) com> wrote

Quote:

CNB wrote:
Mike,

The leak that I see (or have felt) is definately coming from the top
rear of the motor, and runs down onto the front of the transmission,
and onto the hot exhaust pipes below, where it sizzles and smokes
like all get-out. It actually pools up in various pockets behind the
manifold area. I can wipe it clean, but after a few minutes of
running, it's pooled up again. This has caused a huge oil slick down
the back of the motor and onto the transmission and oil pan.

You may have an intake gasket leak, but it was/is very common
for these engines to leak from the distributor shaft o-ring seal.
The o-ring seal sits right above an oil gallery and is exposed to
full line pressure. You might want to start by removing the
distributor and checked the seal. If it hasn't been changed for
a while, you will probably find something that is hard and
cracks apart when you remove it. You can get the new updated
seal from GM, it is a brown/tan color. This new one does not
seem to deteriorate like the old seals did.

Ian

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Hard to find oil leak -GMC 2.8L - need help

General Motors Discussions About General Motors vehicles (alt.autos.gm)

Re: Hard to find oil leak -GMC 2.8L - need help - 12-31-2005 , 10:53 AM

Re: Hard to find oil leak -GMC 2.8L - need help - 12-31-2005 , 12:40 PM

Re: Hard to find oil leak -GMC 2.8L - need help - 12-31-2005 , 06:57 PM

Re: Hard to find oil leak -GMC 2.8L - need help - 12-31-2005 , 07:07 PM