core plugs behind exhaust manifold 3.8

Talk about the E-Type Series 1

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Arnoldhar
Posts: 8
Joined: Sat Sep 07, 2024 9:34 am
Great Britain

#1 core plugs behind exhaust manifold 3.8

Post by Arnoldhar » Mon Oct 06, 2025 1:30 pm

Guys just went to change the exhaust manifolds on my 3.8 and found the smallest of drips behind the gasket covering the coreplug, its very small, are these core plugs troublesome to change and seal? or am i better off with a wipe of JB weld over it, had no idea of any leak until I dropped off the manifold

cheers

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rfs1957
Posts: 1541
Joined: Sat Jan 15, 2011 2:52 pm
Location: Languedoc - France
France

#2 Re: core plugs behind exhaust manifold 3.8

Post by rfs1957 » Mon Oct 06, 2025 8:08 pm

No amount of anything smeared on a core plug will solve your leak.

A can of Bar’sLeak might, and Jaguar used two in every new car at one point, people here will tell you.

Personally if I had this issue I would get the plug out, meticulously clean the seating area, and bang a new one in - an art in itself, have some spares to hand - with a bead of some gasket compound set in the rebate beforehand.
Rory
3.8 OTS S1 Opalescent Silver Grey - built May 28th 1962

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