Stripped Bolt Front Cover - Vintage Mustang Forums
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post #1 of 16 (permalink) Old 09-13-2019, 03:47 PM Thread Starter
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Stripped Bolt Front Cover

Rats

One of the short bolts that hold the water pump to the front cover stripped while reinstalling the water pump.

I have no idea how this happened. All bolts were clean, holes were clean, I had anti-seize on the bolt.

I was torquing the bolts to 18 lbs and this one just kept spinning.

Can I drill and tap it to 3/8?


If not what are my options. This bolt only goes into the cover, not the block.


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post #2 of 16 (permalink) Old 09-13-2019, 03:51 PM
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Helicoil. They come in a kit, the hole is drilled to a specific Helicoil size, then tapped with the Helicoil tap then the thread insert is installed. Uses the original size bolt.
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post #3 of 16 (permalink) Old 09-13-2019, 03:59 PM
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I second the Helicoil recommendation. It is super easy to do. Just make sure to put some lock tight on the insert before you install it.
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post #4 of 16 (permalink) Old 09-13-2019, 04:19 PM Thread Starter
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The hole the bolt goes in is 2 in deep, the water pump is 1 in thick. The bolt itself is 1 1/2 in long.

Im going to run a tap into the hole and see what I get. Nothing to lose.

I may be able to use a 2 in long bolt and grab enough threads to make it work.


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post #5 of 16 (permalink) Old 09-13-2019, 04:21 PM
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There is no way better than the Helicoil for the average motorist. You can pick them up on Amazon or your local auto parts store. Another advantage for later on is that you're using the same/correct wrench for removal and installation.

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post #6 of 16 (permalink) Old 09-13-2019, 05:12 PM Thread Starter
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Im going to buy a heli coil kit, have to go pick up a couple more WP gaskets anyway.

I ran a tap through the cover. Any chance I can get away with installing a stud?

Ive got a bunch of 5/16 carb studs, if I can find them.

There seems to be enough good threads to go that route.


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post #7 of 16 (permalink) Old 09-13-2019, 08:31 PM Thread Starter
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Im looking for the best long term solution.

I tapped the bolt hole and reinstalled the WP.

I torqued the bolt to 15 lbs and it held, But I dont trust it.

I already destroyed one set of WP gaskets, so I need to do the repair right.

If I install a 5/16 helicoil I have to drill a 21/64 hole.

If I drill and tap the hole to 3/8, I have to drill a 20/64 hole. I also have to open that WP hole to 3/8.

Whats the best long term solution?


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post #8 of 16 (permalink) Old 09-13-2019, 08:44 PM
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Last 351W I had, I had a similar issue. Drilled and tapped the hole for 3/8 and used a 3/8 bolt. If you're going concourse, this is not recommended. You'll get called on it. If you just want it to stay together, this works just fine. My 9/16 wrench isn't far away from my 1/2"... just sayin'.

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post #9 of 16 (permalink) Old 09-14-2019, 08:56 AM
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New timing covers aren't that expensive.
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post #10 of 16 (permalink) Old 09-14-2019, 09:42 AM
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Best is repair it so it uses factory size fasteners. Then you are not leaving a mess that will get you cursed by the next owner.

Everybody has to start some place
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post #11 of 16 (permalink) Old 09-14-2019, 01:55 PM Thread Starter
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Ha, the next owner is welcome to come to the cemetery and curse me all day long.
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post #12 of 16 (permalink) Old 09-14-2019, 02:25 PM
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Quote:
Originally Posted by bmcgc View Post
Im looking for the best long term solution.


Whats the best long term solution?

Heli Coil! I have done 3 over the past 2 months (1 on starter to bell housing and both my water neck holes on the alum manifold.

I know I may be weird, but I actually enjoy putting in Heli coils. It is easy and rewarding to fix a stripped out hole. I used red loctite on all of them (coil to tapped hole) and let it set-up overnight.
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post #13 of 16 (permalink) Old 09-14-2019, 03:15 PM
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Quote:
Originally Posted by Tallguy View Post

I know I may be weird, but I actually enjoy putting in Heli coils. It is easy and rewarding to fix a stripped out hole. I used red loctite on all of them (coil to tapped hole) and let it set-up overnight.
I usually keep my cars for 7-10 years and don't want to tear apart the motor and then question "what was the location where I need to take it easy".

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post #14 of 16 (permalink) Old 09-14-2019, 09:49 PM
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I have been using Time-Serts more then Heli-Coils the last couple years. What I like about them is it's a threaded bushing insert vs a coil of thread.

Something to consider anyway.
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post #15 of 16 (permalink) Old 09-15-2019, 06:27 AM Thread Starter
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Helicoils at the box stores $32 a set for 5/16.

Amazon Prime $16.

Everything is on hold until Monday.


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