g741.org

It still looks like oil but has a very obvious gas smell and is much thinner.

Yes they still make several versions of spray on copper coatings for placing a light film on whichever side of the gasket the gasket manufacturer recommends. If you pull up your gasket maker's web site you will find all kinds of pertinent installation information.

The fuel pump is the most common culprit when you find thinned, gas smelling oil in the pan. In the winter long cranking periods associated with a lot gas pumping or priming will also allow a lot of raw gas to find it's way into the pan.

Coolant can get into the oil anyplace the block or gasket fails where oil under pressure is not there and access to the sump is.

Any thoughts on the "O" rings on page 1?
J.B.

They were probably added by someone who thought they would help seal the bolts better. I have seen them used on other cylinder head applications. No telling who's hands did what in a half century of use.

Ah yes, I didn't think of that. There is a low pressure side to the oil system also.
The engine was completely rebuilt a couple of years ago.
J.B.

Actually the crank case is the NO pressure side of the oil system. Unless of course you pull the fording valve knob then she'll rise to about a 2 PSI diff.

Lifer wrote:I don't remember what the stuff was called that we used to seal gaskets back when I was just a kid, but it was a brush-on product in a can with a red label and the words "gasket shellac" underneath a a black Indian head logo. It was pretty tacky stuff. My dad actually used some of it on a piece of a catalog page to make himself some fly paper one time.

It was probably some of this stuff Lifer I used to call it Indian Red Penny when I was younger...



Looks like Permatex owns the rights to the brand now... I've used all sorts of different gasket sealers including the spray on coppers that I really do like...

Typically when coolant is in the oil, it is from a cracked block. Usually the cracks can be found in the area around the top of the valve springs. It is a common problem.

Thanks, Oddjob! That's exactly what it was...minus the word "Permatex" on the label of course.

Oddjob wrote:

I remember that stuff from the late 70's early 80's.

I'm holding in my hand the NAPA/Permatex "High Temperature Thread Sealant."
Small tube, .20 FL. OZ.
NAPA item # 765-2648.
Forgot the price I paid but it was not exorbatant.
I assume one small tube will do all the head bolts.
It's been highly recommended before on this forum.

m37jarhead wrote:I'm holding in my hand the NAPA/Permatex "High Temperature Thread Sealant."
Small tube, .20 FL. OZ.
NAPA item # 765-2648.
Forgot the price I paid but it was not exorbatant.
I assume one small tube will do all the head bolts.
It's been highly recommended before on this forum.

Used as directed, it will do a great job on head bolt threads. We always buy the larger size tubes because we use so much, the 1 you have should do 21 head bolts no problem.