Oil filler gasket- 318/360

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Bud719
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Oil filler gasket- 318/360

Post by 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!
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Bud
1990 Marinette 32 Sedan “Mostly Harmless”
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Knotty
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Re: Oil filler gasket- 318/360

Post by Knotty »

Either too much pressure on it, check the pvc or did you try to double gasket?
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Busia
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Re: Oil filler gasket- 318/360

Post by 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.
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Fastjeff
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Re: Oil filler gasket- 318/360

Post by Fastjeff »

How about using a fat O-ring?

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Bud719
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Re: Oil filler gasket- 318/360

Post by 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!
Bud
1990 Marinette 32 Sedan “Mostly Harmless”
Twin Chrysler 360s RWC
Westerbeke 6.5 KW
Beard’s Creek, South River,
Chesapeake Bay, Maryland
TinLizzy
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Re: Oil filler gasket- 318/360

Post by 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.
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GB49
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Re: Oil filler gasket- 318/360

Post by 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.
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barefoot99
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Re: Oil filler gasket- 318/360

Post by 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.
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Bud719
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Re: Oil filler gasket- 318/360

Post by 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?
Bud
1990 Marinette 32 Sedan “Mostly Harmless”
Twin Chrysler 360s RWC
Westerbeke 6.5 KW
Beard’s Creek, South River,
Chesapeake Bay, Maryland
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