1948 rear head leak

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doc308
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1948 rear head leak

#1

Post by doc308 »

I just noticed a leak on the rear area of the rear head on my '48 pan. It's coming from what seems to be plug in the head (refer to pictures).

Q's--What is that plug there for? What could happen if this were to continue--e.g, damage to the head, etc? Is there agood way to plug it up without removing the head--such aswith JB Weld Stick?
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Cotten
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Re: '48 rear head leak

#2

Post by Cotten »

Doc!

The plug is a "welch plug" installed at the factory to seal an oil gallery drilled from that end.

Although replacement is not complicated, I suggest trying to seal it from the outside if you can.
I am not familiar with "JBWeld stick', but strenuous de-greasing and wicking-grade Loctite may do it.

Myself, I use an isocyanate urethane watertower paint that sticks through oil with amazing success.

....Cotten
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