Spark plug thread gone :/

Big lumps of metals and spanners.

Moderators: Moderators, User administrators

Posts: 101
Joined: 09 Sep 2012, 14:41
80-90 Mem No: 14160

Spark plug thread gone :/

Post by JimmyT25 »

Today I decided to replace my spark plugs, upon replacing them I noticed one was a bit wobbly so I was careful when I did it up as I think at some point someone has cross threaded it and stripped some of the tread out.
I tried to start the van and a hissing noise was made when turning it over, I checked the plugs, removed and re tightened the dodgy one and the last of the remaining thread came out of the head :(

I'm now wondering whether to use a helicoil or time time sert to try and sort it? I'm also assuming these are options that can be done with the engine in situ? If anyone could advise on which option is best, what I need and how to do it that would be great. I have re tapped threads etc before but I haven't used either helicoil or time sert before.


User avatar
Posts: 2399
Joined: 27 Mar 2008, 13:50
80-90 Mem No: 5789
Location: West Kent

Re: Spark plug thread gone :/

Post by bigherb »

I generally prefer inserts for spark plug repairs it has been known for helicoils to wind into the combustion chamber when replacing spark plugs.
1982 Camper 1970 1500 Beetle Various Skoda's, Ariel Arrow