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Old June 30th, 2019, 20:36   #1
yahjnby
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Default Stripped harmonic balancer bolt

Trying to work on my engine and I stripped two of the Allen bolts on my harmonic balancer. I have not bothered trying the other two yet.
Anyone have experience dealing with these things when they strip. I have begun to hate Allen bolts on VW‘s with a white hot passion.
Fortunately I’m not in a rush. I’m hoping somebody here has been successful with something. I do have something that I used on stripped Valve cover bolts, but I don’t think the little screw on caps are going to fit in the space of the harmonic balancer, let alone allow me to stabilize it while I crank on it.
1998 new beetle TDI

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Old June 30th, 2019, 20:49   #2
mr.loops
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Ya you wonít be able to get a bolt extractor in there - too tight

I would grab a torx bit ( find one that is a good tight fit) and hammer it into the offending hole.


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Old June 30th, 2019, 20:58   #3
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I'd tack weld the bit you used on there if you can't get extractor in there.

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Old July 1st, 2019, 04:19   #4
Tdijarhead
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Use a hammer and a piece of rod on them. I always give each bolt two or three solid wacks with this method. So far I’ve never had one strip out.

As far as the already stripped ones , tack weld as mentioned, hammering a torx or next size Allen into the hole, or hammering a socket over the head. Before trying any of those methods hit those stripped bolts a I described above, it helps to break them loose.

Of course you will want to replace all 4 with new bolts.
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Old July 1st, 2019, 05:41   #5
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12mm 12 point socket driven on with a hammer will get those out. Before trying to loosen the 2 you haven't yet, place the 6mm allen socket in the head and tap several times with a hammer, then use an air or electric impact to remove them.

You can also drill off the head of the stripped ones, they are pretty soft and drill easily. The 12mm 12 point socket is the cheapest and easiest way.
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Old July 1st, 2019, 12:31   #6
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The one good thing with the socket head screws, they're easy to drill off cause they're pre-centered. They make a lot of different extraction solutions, in the mean time hit them with PB Blaster (or better) followed by hard raps as jarhead suggests, repeat.
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Old July 1st, 2019, 14:01   #7
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I like the Irwin bit that goes around the head. They always work for these bolts. Well, they've always worked for me. There's a first time for everything...

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Old July 1st, 2019, 14:36   #8
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Yeah I’ve done the socket and drilling the head off. Both work great, once you drill the head off and dampener removed the screws pretty much come out with your hand.
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Old July 1st, 2019, 18:22   #9
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I've had success with using an air hammer with a punch point in the center of the bolt. Just put on a small vice grip onto the head and they turn out quite easy while hammering with the air chisel.
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Old July 2nd, 2019, 08:09   #10
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Quote:
Originally Posted by Powder Hound View Post
I like the Irwin bit that goes around the head. They always work for these bolts. Well, they've always worked for me. There's a first time for everything...

Cheers,

PH
I agree with this. I have used Irwin's for this kind of purpose for many years. There is enough room.

I use a hammer to tap the extractor bit into the soft bolt head, then remove with the 3/8" socket and extension.
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Old July 2nd, 2019, 08:12   #11
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Quote:
Originally Posted by dogdots View Post
12mm 12 point socket driven on with a hammer will get those out. Before trying to loosen the 2 you haven't yet, place the 6mm allen socket in the head and tap several times with a hammer, then use an air or electric impact to remove them.

You can also drill off the head of the stripped ones, they are pretty soft and drill easily. The 12mm 12 point socket is the cheapest and easiest way.

I second the 12mm socket method. Works REALLY well and doesn’t damage anything.
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Old July 3rd, 2019, 04:18   #12
yahjnby
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Thanks all. I’m getting back to it this weekend, and PB blasting in the meantime. I’ll let you know what I end up trying and how it works out.
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Old July 3rd, 2019, 11:42   #13
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My question is how did you strip them out? Were you using the correct size metric hex key or the closest SAE size that would fit?
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Old July 3rd, 2019, 11:44   #14
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Quote:
Originally Posted by yahjnby View Post
Thanks all. Iím getting back to it this weekend, and PB blasting in the meantime. Iíll let you know what I end up trying and how it works out.

When you install them don't overtorque them. It's only 18 ft lbs.
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Old July 3rd, 2019, 11:51   #15
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For the ALH it is actually 10Nm (~7.5 ft-lb) + 1/4 turn. And they should be replaced.

Quote:
Originally Posted by jokila View Post
When you install them don't overtorque them. It's only 18 ft lbs.
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