....
Can you tell which thing is not like the others
By the time I finish my song?


Sesame Street flashback...


Anyway, this is what I pulled out of the "rebuilt 5k ago" motor from the 914.

At first I was confused, how could one spark plug be bigger? But then the ol' gears started turning...

Helicoil or something I guess, but now what do I do? Can I buy another one to replace this so I can get the plug back in? This one can't go back in because it's split, which has to be where my "loudness" is coming from.

FLAPS? a size 3/8ths helicoil

Your helicoil came out. That sucks.
What kinda motor you got there I might have a head you can get from me.
Pm me.

have it welded up and re-taped with the original thread size ....

Andy

Have it welded up and retaped for a SMALLER then orignial size plug. Then it won't develop a crack between the plug hole and the valve.

It's NOT a helicoil, and it's NOT 3/8ths. It's a FLAPSD style insert, and a new one ain't gonna fix the problem. You need a head repair by a REAL machine shop, welding up the crack and replacing the seats. The Cap'n

Not a helicoil, it is a spark plug insert. For now, just go buy a new insert, and new plug. use some antiseeze on the plug threads (not the insert) but do not use it on the external insert threads. This is typical to happen, the insert comes out with the plug. I have driven many many years with inserts, but more often than not must replace teh insert with each plug change. sooner or later you'll wont a "proper" repair and have the heads removed, welded up, and re-drilled/tapped for the original plug size, in the mean time keep some spare inserts handy. Beware that that the threads int eh head holding the insert might be weak (not tapped correctly, heat damaged aluminum, etc...) so don't remove that plug anymore than needed, as you might find that the remaining threads in the head will strip, leaving you with no other option other than the "correct" repair.

good luck

Use Jake's trick- Milk of magnesia on the new plug threads..

Plugs will come out much easier.

Ken