L78 Oil Drain Plug Gasket

[James W.]

In the current NCRS TGJM the verbage regarding the oil drain plugs for the base 300, 350 and 365 HP engines states that a white nylon gasket is used between the drain plug and the oil pan. The desciption of the L78 drain plug mentions nothing about a gasket of any type.

Is the same white nylon gasket, a different type of gasket or nothing at all used between the drain plug and the pan? if there is a gasket I would assume it would be painted engine color as it would have been installed? prior to the engine being painted at Tonowanda... correct?


Thanks,

James West

[Gene M.]

Re: L78 Oil Drain Plug Gasket

James,
Typical that the orange paint does not adhere well to the plastic (nylon or delrin material) seal washer. Most are typical white. I have seen replacements in black.

[James W.]

Re: L78 Oil Drain Plug Gasket

James,
Typical that the orange paint does not adhere well to the plastic (nylon or delrin material) seal washer. Most are typical white. I have seen replacements in black.

Gene,

Thanks for the reply. So the same nylon seal washer is used for the L78... this is what I thought but since the TGJM does not mention it specifically for the L78 I thought it may have been different. This would be another item to be corrected for the upcoming sixth edition of the 2014 1965 TGJM.


Best Regards,

James West

[Joe L.]

Re: L78 Oil Drain Plug Gasket

Gene,

Thanks for the reply. So the same nylon seal washer is used for the L78... this is what I thought but since the TGJM does not mention it specifically for the L78 I thought it may have been different. This would be another item to be corrected for the upcoming sixth edition of the 2014 1965 TGJM.


Best Regards,

James West

James------


That off-white, nylon gasket was used for many years on ALL Chevrolet engines. In fact, from 1956 to 1986. How well did it work? Not very well; drips were common.

[David L.]

Re: L78 Oil Drain Plug Gasket

My 1965 Chev. Parts Catalog (May 1965) lists GM # 513975 in Gr. 1.456 for the oil pan drain bolt gasket for All models including the Corvette and describes it as "nylon - 1/2 I.D.".

GM # 513975 was replaced with GM # 3921989 in December 1968.

GM # 3921989 is described as "nylon 1/2 I.D. x 9/16 O.D." in my 1969 Chev. Parts Catalog.

Dave

[Carl N.]

Re: L78 Oil Drain Plug Gasket

Plug and gasket should be painted - gasket only on part exposed may have little or no paint showing