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Welch plug replacement- cylinder head.
No life (a.k.a. DattoMaster)
Joined:
2002/6/14 7:24
From Sydney
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Anyone ever ever successfully replaced the welch plug in the rear of the cylinder head, without removing the head? Itís oh so tight with limited space between head and firewall.

Iím keen to hear how you went about it. Worst case scenario, the head will have to come off.

cheers.

Posted on: 3/6 10:29

Edited by benny on 2021/3/6 11:50:17
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Re: Welch plug replacement- cylinder head.
Home away from home
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2004/2/29 11:00
From Sydney , NSW
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No good news for you I think Benny .... The old one will be painful to remove as it will most likely be lightly corroded in and the new one is an interference fit which has to be set straight as you can imagine. Head gasket is cheaper than the anger management therapy that will be required otherwise!

Posted on: 3/7 8:19
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Re: Welch plug replacement- cylinder head.
No life (a.k.a. DattoMaster)
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Only had to do it once; I too pulled the head, I left the intake & exhaust attached.

Posted on: 3/8 4:47
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Re: Welch plug replacement- cylinder head.
No life (a.k.a. DattoMaster)
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ive done it once but had the gearbox out which made it possible from underneath, still had to swear at it though

Posted on: 3/9 2:43
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Re: Welch plug replacement- cylinder head.
No life (a.k.a. DattoMaster)
Joined:
2002/6/14 7:24
From Sydney
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Registered Users
Posts: 2580
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Thanks for the replies, head came off. Probably best as upon inspection the valve stem seals were severely worn or missing. Good colour in the combustion chamber indicator good burn. Closer look at block under the headers, reveal the other Welch plugs were shot. It would have been a matter of time. Only one left to replace to the 50mm plug behind the flywheel.

Posted on: 3/10 7:44
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-----------------------------------------
1971 B110 Sedan GX Spec
1970 KB110 Coupe Track Car
1970 KB10 Coupe
-----------------------------------------
S13 caliper b...
Transfer the post to other applications Transfer






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