Latest Lost Cause Project: 1979 Z28

[bluex]

If its already had a helicoil installed its oversize an cant be rethreaded to the stock size anyway. Probably why no one wants to touch it.

In this day an age with the modern consumer, you take on a problem you didn't create, you now own it regardless. That makes alot of people/business weary of stuff like that imo...

 

[bucket]

If its already had a helicoil installed its oversize an cant be rethreaded to the stock size anyway. Probably why no one wants to touch it.

In this day an age with the modern consumer, you take on a problem you didn't create, you now own it regardless. That makes alot of people/business weary of stuff like that imo...

I believe timeserts are available in larger diameters for cases such as this?

 

[Ricko1966]

I can fix that,you can fix that.That is NBD. Busy right now write more later.

I believe timeserts are available in larger diameters for cases such as this?

Yep time sert big sert will fix it. Probably remove the helicoil maybe tap deeper install a regular time sert deep and judge depth maybe have to go studs and one deep stud. We also used to make inserts commonly on crap people have already buggered up.If it's too buggered for a time sert or a big sert. Pic a bolt big enough to fill the hole,tap the hole. Drill a pilot hole dead center of the bolt,then a bigger pilot hole. If you don't have access to a lathe,I know how to do it with a drill press,just ask. Lock tight your bolt and screw it in snug plus a little. Let your lock tight dry. Now you can hold the head of the bolt to drill and tap the bolt. Use a bigger bit to drill the head off and leave a chamfer.. Beauty of this method,you can go as big and as deep as you want. I'd stud it when I was done.

 

[Midnightmoon]

If its already had a helicoil installed its oversize an cant be rethreaded to the stock size anyway. Probably why no one wants to touch it.

In this day an age with the modern consumer, you take on a problem you didn't create, you now own it regardless. That makes alot of people/business weary of stuff like that imo...

And we are down to literally 2 legit machine shops in our area. And one of the two is years behind on customer builds. They are't going to waste time on a high labor low profit repair like this.

 

[Midnightmoon]

I can fix that,you can fix that.That is NBD. Busy right now write more later.
Yep time sert big sert will fix it. Probably remove the helicoil maybe tap deeper install a regular time sert and judge depth maybe have to go studs and one deep stud. We also used to make inserts commonly on crap people have already buggered up.If it's too buggered for a time sert or a big sert. Pic a bolt big enough to fill the hole,tap the hole. Drill a pilot hole dead center of the bolt,then a bigger pilot hole. If you don't have access to a lathe,I know how to do it with a drill press,just ask. Lock tight your bolt and screw it in snug plus a little. Let your lock tight dry. Now you can hold the head of the bolt to drill and tap the bolt. Use a bigger bit to drill the head off and leave a chamfer.. Beauty of this method,you can go as big and as deep as you want. I'd stud it when I was done.

I like this idea. Going to do some reading on the time serts. Thank you!

 

[Midnightmoon]

I believe timeserts are available in larger diameters for cases such as this?

Excellent. Thanks!

 

[Ricko1966]

I'd look at these inserts compare them to the helicoil. These are 1 inch deep and I believe the same thread as a standard helicoil. See what the threads look like,see how deep they are. If a shade over 1 inch and 3/4 good threads I think I'd use these inserts and make an instalation tool. If I question a fastener will hold torque on assembly I over torque it in advance,before assembly,if I can over torque it,I know I can pull factory torque. Thing about helicoils you can pull just a couple of coils. Timeserts are 1 piece.

 

[77Dmax]

Two things

Do not flap wheel it. You'll create a low spot in the deck which will cause all sorts of other problems.

I wouldn't condemn the helicoil just yet. Pull it out and if the threads look good I'd install a new one. After that stud that hole and go racing.

 

[Midnightmoon]

Just to confirm, these are the correct helicoils if I would start by trying to extract and reinstall one?

Heli-Coil HE5521-7 Heli-Coil Thread Inserts | Summit Racing

Free Shipping - Heli-Coil Thread Inserts with qualifying orders of $109. Shop Heli-Coil Repair Kits at Summit Racing.

www.summitracing.com

 

[Turbo4whl]

Lot of good info posted here by the members. Some common mistakes people make installing Heli-coils, coil is too long, your issue. The other issue, coil is set too deep in the re-thread, making the bottom of the insert too small for the bolt to clamp tight.

You can remove the insert by grabbing the top ring with pliers and just pull it straight out. The coil will stretch and come out. If it was installed with Loctite, warm it until you smell the Loctite.

I worked many years in the machine shop. Fixing poorly installed re-thread kits, clearly a specialty. Where are you in Pennsylvania?

 

[Midnightmoon]

Lot of good info posted here by the members. Some common mistakes people make installing Heli-coils, coil is too long, your issue. The other issue, coil is set too deep in the re-thread, making the bottom of the insert too small for the bolt to clamp tight.

You can remove the insert by grabbing the top ring with pliers and just pull it straight out. The coil will stretch and come out. If it was installed with Loctite, warm it until you smell the Loctite.

I worked many years in the machine shop. Fixing poorly installed re-thread kits, clearly a specialty. Where are you in Pennsylvania?

Southwestern corner of PA. Thanks for the advice.

 

[Midnightmoon]

Today's update. Going to pull the engine tomorrow morning. Have everything ready for it to be yanked.

Head has a heavy score around the suspect bolt hole. Block deck has the similar damage. I'm not going to trust it unless I take it out and have it gone over at a machine shop.

Been scratching my head all weekend as to what scored that nearly perfect circle in both the head and block. Didn't realize until this morning that the coil must have broke off and got stuck on the gasket between the surfaces. Whoever assembled this thing has to have known that there was an issue. But in the limited run time, the damage was done.

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[Midnightmoon]

Looks kinda lonely there all torn apart....lol

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[Midnightmoon]

Picture heavy day today. So, the Junkyard 350 idea to keep moving forward on the project turned out to be a 5 hour round trip to State College PA to pick up a used engine from Marketplace. Came with a bunch of stuff that I don't need but wasn't going to turn down........ headers, AC Compressor, fan, billet pullies, alternator, etc. It's a GM reman and was in. 69 C10.

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[Midnightmoon]

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