Helicoil issues

[Funhaver]

I have an 73 evinrude 115 that I bought with a helicoil in cylinder 1 spark plug hole. In marine helicoils are they supposed to stay in the head like a car? Or are they supposed to thread out with the spark plug?
Mine was threading out with the spark plug and the last time I put it in I guess that was it's last leg, it no longer gets tight in the spark plug hole, does anyone know a way to get it tight for the meantime while I try to locate a head?

 

[Crosbyman]

Mine came with a punch tool to lock them in place.... tried RED LOCKTITE ?

 

[racerone]

Your location ?

 

[Funhaver]

I'm in Florida, the helicoil was already installed prior to me buying the motor, but there isn't any loctite on the threads

 

[jakedaawg]

Just take it.to a competent machine shop. I realize that can be tricky to find in Florida. Your not looking for the least expensive machine shop.

As far as a used head goes...I am going to send you a pm, private message.

 

[Funhaver]

I work on cars as a profession and I have worked with most machine shops in my area and haven't found one I'd be willing to go back to. A good machine shop is hard to find in these parts

 

[Sea Rider]

If the helicoil is being removed along with the spark plug, once fully out add some drops of red loctite at both sides of the cylinder head threads and the helicoil's external ones, should hold well in place. But for a better fit I would install a new helicoil in along the red loctite drops.

Happy Boating​

 

[dingbat]

Helicoils in aluminum are a "quick fix" at best.........will fail sooner than later if the fastener is removed repetitively.

The best long term solution is to replace the head.

 

[racerone]

Helicoils are OK---But if someone is taking the plugs out twice a week for some reason then the bets are off.

 

[Sea Rider]

A better fix will be the Timeserts, don't know if will be possible to install same size ones in same drilled orifice for an Helicoil one ? For a correct fit need to use the precise tools, probably that one was installed with a non Helicoil kit tool ?

Happy Boating​

 

[dingbat]

A better fix will be the Timeserts, don't know if will be possible to install same size ones in same drilled orifice for an Helicoil one ? For a correct fit need to use the precise tools, probably that one was installed with a non Helicoil kit tool ?

Happy Boating​

Timeserts are an adaptation of interference fit (SS) inserts used to "harden" threads in aluminum. We used them for years in our products.

They work very well but typically require specialty tooling to insert them correctly.

 

[Sea Rider]

Timeserts are an adaptation of interference fit (SS) inserts used to "harden" threads in aluminum. We used them for years in our products.

They work very well but typically require specialty tooling to insert them correctly.

Yep need to fix a near stripped thread in a powerhead, I'm elucidating whether to install an M8 x 1.25 Helicoil or Timesert, the cost is $ 85 bucks for the Timesert kit versus the $ 15.00 for the Helicoil kit both with their own insertion tooling + shipping....

Happy Boating​