Helicoil Help

[jsalz]

Hello all, stripped out one of my spark plugs while doing a decarbonize. Anyway, decided I will have a helicoil installed. One shop told me it will be 150 bucks out the door. Talked to another shop that will do it for 40 if I pull the head. Here is where I am unsure. I will replace the head gasket when I put it back on but there is another gasket between the cylinder head cover and the head. I don't think I should have to replace it but not sure? Also, I have the torque spec for the head bolts but I am unsure of the order. The manual says alternate but gives no diagram.

 

[tashasdaddy]

Re: Helicoil Help

help to know what year and motor. also the $150 shop is covering the butts, incase they break a head bolt.

 

[jsalz]

Re: Helicoil Help

Whoops, sorry. Its a 1974 Johnson 50hp. 50ESL74M

 

[ezeke]

Re: Helicoil Help

You could most likely find a good cylinder head at a salvage yard. If you want to shop it, try these:

sea-way.com

outboard-parts.com
laingsoutboards.com

tcoutboard.com

fairwindsmarina.com

salvagemarine.com

marinepartsoutlet.com

 

[Joe Reeves]

Re: Helicoil Help

What kind of guns did those fellows have, and were both of them named Jesse?

There are two different lengths pertaining to the 14mm heli coils. Measure the depth of the threads on your particular head to determine which length you need. The Heli Coil set can be purchased at any automotive parts type store, and usually any reliable hardware store for $10 or $15 which includes a drill, the installation tool, and a number of the heli coils..... and it doesn't require rocket science mentality to install one.

If you should be in the Tampa Bay, Florida area, I'd install one for a flat $15.00.

Also...... It's not necessary to remove the cylinder head to install one of those heli coils. The shavings would be very small particles of aluminum (Not Steel). Simply have the piston raised high enough to cover the intake port holes, then after installing the heli coil, simply blow the particles out with compressed air. Even if the particles are left in the clyinder, they would blow out the exhaust on the first combustion explosion.

 

[JB]

Re: Helicoil Help

I really prefer Time-Serts to Helicoils because they are aluminum alloy.

JohnnyRudes (like most 2 strokes) are sensitive to plug temp. Steel helicoils conduct heat slower than alloy Time-Serts, thus your plugs are operating hotter than stock. With the Time-Serts plugs run at normal temps.

That is the theory, anyway. In practice I know of no problems known to be caused by Helicoils properly installed in 2 stroke alloy heads. I did get severe detonation from using Helicoils in one of my Corvair engines. When I replaced the head with one that had Time-Serts in it I got normal operation.