MK3 plug insert.

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MAK

MAK

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MK3 Spark plug insert.
Have recently purchased a 1978 MK3.
Removing the spark plug from the head the Time Sert plug insert also came out.
Can anyone recommend a product that can prevent this happening again.
I.E high temp. Loctite or any other product. Thanks
 
All I can recommend is a better machine shop, and copper slip…

A correctly fitted insert or helicoil just shouldn’t come out like that.

Especially if a dab of copper slip is used on the plug threads.
 
Fast Eddie said:
All I can recommend is a better machine shop, and copper slip…

A correctly fitted insert or helicoil just shouldn’t come out like that.

Especially if a dab of copper slip is used on the plug threads.
Click to expand...
The insert is supposed to de-form using the correct tool locking it into the head.
This hasn’t prevented it from coming out though.There’s evidence of glue! High temperature JB weld? I will never know.
Can someone recommend a product?
 
FYI
 

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Mak, if you bought it from a dealer, are you still within the timeframe whereby they should fix this issue ?
 
Fast Eddie said:
Mak, if you bought it from a dealer, are you still within the timeframe whereby they should fix this issue ?
Click to expand...
Bought it from a friend who had owned it from new.
I new what I was letting myself in for!
Sadly old age and a stroke ended his motorcycle career.
 
jaydee75 said:
A 78 Mk3 ???
l didn’t know there was such a thing.

Jaydee
Click to expand...
Probably means 1978 registered because, as we know, the last Mk3s were assembled during 1977.
 
Last edited:
Loc tite makes several products, I think Green is hi temp. Make sure both head and insert are clean. When reinstalling plug , use anti-seize in threads good luck
 
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