Firstgenfanatic

Ok, I am planning to do a valve adjustment on my 93' next week. I have new Cummins brand valve cover gaskets and the appropriate tools to get the job done. I did some reading on here and discovered that there are 0-rings that seal the valve cover bolts. Here are my questions:

What do these o-rings seal exactly?
How many o-rings are required for the valve covers?
What are the o-rings made of (special materials for oil/heat exposure)?
Does any have a part number or price for a set of them?

Thanks!

jdwest

I just did the same thing a few days ago. I got my gaskets at NAPA and the o-rings came with the valve cover gaskets. As far as I can tell they're just run of the mill o-rings to keep the oil from spewing out the top of the valve cover. You only need one o-ring per valve cover bolt. You'll see how they sit when you pull the valve cover bolts...that is if the o-ring hasn't rotted away. Mine were. Are you sure they didn't come with your valve cover gaskets?

DLittle

I got my o-rings at the local dodge dealer.

Firstgenfanatic

Nah,

the valve cover gaskets I recieved are true CUMMINS brand ones and did not come with the o-rings. I'm guessing this is an item I can get locally at the dealer or diesel shop? I just want to make sure I get the right ones.

99globalwarmer

i used some old i think 3/8 fuel line around the bolt and just tightened the bolt no worries, cheap and easy

G1625S

Yeah, mine are all but rotted and gone. Unless you have absurd blow-by, the o-ring won't leak

wannadiesel

A hardware store o-ring will work.

Firstgenfanatic

I assume that this O-ring is nothing special. In that case I have access to generic black o-rings that I can use.

BC847

Crap! Geno's Garage sent me six rubber noise isolators (the rubber thing that holds the beauty plate above the valve covers) instead of the O-ring.

99globalwarmer

rubber hose smashed between the bolt head and the valve cover works pretty good, cut it thin and tighten down the bolts,no oil for about 500 miles cheap and quick.

jdwest

I know, I know....I should have used the genuine article . It was kinda a last minute thing to run the valves and change the valve cover gaskets. Minus 20 horsepower for me!