Head Bolt Hole Stripped, Need Help

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ctltmp
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Head Bolt Hole Stripped, Need Help

Postby ctltmp » Mon Aug 08, 2016 5:00 pm

Well, this ain't good. Went to torque down the head and one of the bolt holes didn't make it to 45 lbs.

I did run a tap in all the holes and chase all the head bolt threads before starting. Of course it's on the valve train side near a water jacket. If your looking at the torque sequence I believe it's #5.

Anyone have a solution? This is one thing I've never had to deal with before.

Thanks in advance!
WV Mike

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Re: Head Bolt Hole Stripped, Need Help

Postby raystractors » Mon Aug 08, 2016 5:09 pm

search the net about helicoil. These are the cheapest and easiest solution out there.

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Re: Head Bolt Hole Stripped, Need Help

Postby ctltmp » Mon Aug 08, 2016 5:16 pm

I've used helicoils before. My concern is if the bolt does go into a water jacket will it seal offor.

Also have the issue of taking the head back off. I had all the bolts torqued to 20 lbs. for a first pass and the gasket sprayed with copper. Am I also looking at a new head gasket now?
.
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Re: Head Bolt Hole Stripped, Need Help

Postby ScottyD'sdad » Mon Aug 08, 2016 5:28 pm

use a sealer on the helicoil, and also on the bolt threads. You can take a channce at re using the head gasket, since it wasn't torqued all the way. If it leaks, you can change it later.
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Re: Head Bolt Hole Stripped, Need Help

Postby Bill E Bob » Mon Aug 08, 2016 6:23 pm

As for the head gasket--I had one which was fully torqued twice--3rd time--still no drips/runs/errors.

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Re: Head Bolt Hole Stripped, Need Help

Postby staninlowerAL » Mon Aug 08, 2016 7:14 pm

A good friend rebuilt a FCub engine and had the same problem, threads would not make it to 45 lbs torque. He rethreaded all the head bolt holes to the next size.

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Re: Head Bolt Hole Stripped, Need Help

Postby ctltmp » Mon Aug 08, 2016 7:59 pm

This is a 49 F model. Another thought.......I measured the depth of the bolt hole and it's over an inch deeper than the length of the bolt. What if a fella got a bolt and inch longer or so and try to get into some good threads?
WV Mike

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Re: Head Bolt Hole Stripped, Need Help

Postby Bob McCarty » Mon Aug 08, 2016 8:07 pm

I would doubt that the hole is threaded that much past what was needed for the correct length bolt. IMO the helicoil is the easiest and best fix.

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Re: Head Bolt Hole Stripped, Need Help

Postby tst » Mon Aug 08, 2016 8:27 pm

Its a good practice to use new head bolts, old ones just do not make it some times

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Re: Head Bolt Hole Stripped, Need Help

Postby two4fan » Mon Aug 08, 2016 8:52 pm

Im not a big believer in helicoils. I use timeserts a lot to fix other peoples mishaps and they do make a kit for head bolts. good luck!

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Re: Head Bolt Hole Stripped, Need Help

Postby CraigKennedy » Thu Aug 25, 2016 7:40 pm

Heilcoil is the way to go, my lo-boy has 3.
Use copper spray gasket on the head gasket and spray the bolts with it before installig.
Probably a good idea to get another head gasket too.
And get grade 8 bolts

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Re: Head Bolt Hole Stripped, Need Help

Postby BigBill » Wed Mar 01, 2017 11:41 pm

When I was assembly the 155mm howitzers for the US ARMY everything was helicoiled. We used lacquer paint with a q tip in the threaded holes before we installed the heli coils. This seals and glues in the heli coil. I use hi tac sealer on the headgasket and permatex on the headbolt threads.
I'm technically misunderstood at times i guess its been this way my whole life so why should it change now.

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Re: Head Bolt Hole Stripped, Need Help

Postby inairam » Thu Mar 02, 2017 11:23 am

for head bolts you may do better with E-Z LOK Threaded Inserts than Helicoil. And use the permatex.

What you can get away in other parts on the cub is one thing. There is more going on with the head bolts. I would be conservative and do more not less in this repair
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Re: Head Bolt Hole Stripped, Need Help

Postby bofahs » Thu Mar 02, 2017 11:50 am

I'm not sure there's anything to lose in trying the longer bolt. Remember, three full threads of engagement will give the full strength of the bolt, so, maybe 1/2 inch longer? Unless the concern is for the female threads. Run a tap in first. I can't address interference issues, but seems unlikely. Cheap fix - if it doesn't work, I don't think you'd be any worse off.

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Re: Head Bolt Hole Stripped, Need Help

Postby John *.?-!.* cub owner » Thu Mar 02, 2017 11:53 am

I am not a professional mechanic, but in addition to maintaining my own stuff I also help friends and neighbors with their machinery when I am able. I have used Helicoils on several engines, both cubs and bigger engines. My preference is to use Permatex Aircraft Sealant on the outer threads of the Helicoil when in heads, then TFE paste sealer on the bolt threads. It isn't normally needed on heads, but in deeper holes with longer threaded areas Helicoils can be stacked. Do not forget to remove the tang when each one is installed, and any excess can be removed from the top with a cut off wheel in a Dremel.
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