Pagoda SL Group

W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: baileysd46 on December 16, 2011, 11:10:56

Title: Helicoil Solution
Post by: baileysd46 on December 16, 2011, 11:10:56

Hello,
Could some update me about a heilicoil solution used with spark plugs?
Thanks
Scott

Title: Re: Helicoil Solution
Post by: Cees Klumper on December 16, 2011, 22:47:20

Have you tried the search function? I think you will find all the information you'll need.

Title: Re: Helicoil Solution
Post by: Jonny B on December 17, 2011, 17:47:39

I looked yesterday and was going to comment but the internet connection at the airport was not cooperating. I tried "helicoil" in the search function, with no other qualifiers and got a page of hits.

Title: Re: Helicoil Solution
Post by: Jack Jones on December 27, 2011, 02:01:17

Hi,

Helicoil's are a crude way to repair spark plug threads or any threads for that matter. The best system for thread repair is Time Sert and is easily found on Ebay etc. I have been using them for years and when installed correctly, they will never pull out with the spark plug, unlike heilcoil.

Title: Re: Helicoil Solution
Post by: stickandrudderman on December 28, 2011, 17:26:45

Ditto............

Title: Re: Helicoil Solution
Post by: Raymond on December 29, 2011, 23:09:22

A Helicoil is not a good solution for aspark plug.  I have used one on a ball stud adjuster and it works just fine, but that is not being pulled out every time I want to play with the engine.  The threadserts are a bit more durable solution. 

Title: Re: Helicoil Solution
Post by: stickandrudderman on December 30, 2011, 09:49:15

A strange digression: Aeroplane engineers are not allowed to use timecerts as they are not approved, so they're stuck with heli-coils!

Title: Re: Helicoil Solution
Post by: Jack Jones on December 31, 2011, 03:58:42

Old habits die hard.

Title: Re: Helicoil Solution
Post by: roadsterdude on December 31, 2011, 20:49:33

What size Time Sert for our spark plugs?  I have a helicoil that needs to be replaced.

Title: Re: Helicoil Solution
Post by: Jack Jones on January 02, 2012, 02:37:34

It is a 14mm spark plug but I do not know if you can use Time-Sert once a helicoil has been installed. I believe that once you cut the threads for the helicoil the hole is too large for a successful Time-Sert repair.

Nice to see a Mercedes person that is also into Datsun Roadsters. I am still heavily involved with a group of Datsun folks even after I sold my 69 2000 Roadster.

Title: Re: Helicoil Solution
Post by: stickandrudderman on January 02, 2012, 11:28:08

You certainly will be able to use a time cert. If the standard spark plug thread set cannot be used, there is a "bigcert" kit for just such occasions.
A big outlay for the home mechanic though.
I've had mine for about 10 years and only used it twice. The last time I used it was on a Gullwing so I had no problem in recovering my capital outlay........