Oil filler gasket- 318/360

[Bud719]

Does anyone know where to get gaskets for these filler caps? I have tried to make them out of cork and paper, and they always leak!
Thanks!

[Knotty]

Either too much pressure on it, check the pvc or did you try to double gasket?

[Busia]

There should be little or no pressure on the cap and no liquid, just fumes. I would get an old inner tube and a pair of scissors and make a gasket.

[Fastjeff]

How about using a fat O-ring?

Jeff

[Bud719]

Interesting - There doesn't seem to be pressure in the valve covers, but there seems to be oil on the gasket all the time. I'll try rubber.
Thanks!

[TinLizzy]

There isn't any pressure, but the amount of oil thrown around under the cap that some weeps by if there isn't a good seal. I had the same problem on a previous engine, never fixed it.

[GB49]

If I recall I have 2 flat gaskets under my breathers and you may also be able to bend up the wings to make it fit a bit tighter. The oil fill caps only have a single gasket, I think.....They seem to fit more snug than the breathers.

[barefoot99]

Gaskets can be bought at most auto parts stores, for a truck engine , same year as the boat. They still leak, even doubled up. The fix is a grommet with a new breather for the grommet. Bending the wings is helpful also. Look at Mancini racing for the grommet style. They are a bit pricey - there other options , once you pick one out you like.

[Bud719]

Thanks for the info! I’m glad I am not alone in having this issue.

Why wouldn’t the system have the breather coming off the center of the valve cover (like the PVC valve side does) and have a normal cap at the oil fill?

[Bud719]

What do you think of replacing the combination oil filler with the 2 piece as shown, one on the oil filler, and the other in the top of the valve cover across from the PVC Valve on my Chrysler 360s?

I picked these up at my local Junk yard (degreased then cleaned them with my Apple cider rust remover/ Baking soda - the best) for less than $10?