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Stripped out cam cover hole  Rating:  Rating
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 Posted: 08-02-2014 04:14 am
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srq2002
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Was just cleaning out the bolt holes prior to fitting the JHPS cam cover gaskets, and I find the the bottom center hole for the exhaust cover is stripped out. Argh.

What's the best fix? Tap it out to the next size? Helicoil?

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 Posted: 08-02-2014 05:32 pm
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gmgiltd
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I would suggest that you helicoil rather than use oversize studs and it maybe an idea to do them all when you are at it as some of the others could be damaged if not stripped. I believe the torque recommended for these was only 4lb which is very low and easily exceeded which often leads to splayed cam covers and oil leaks. I ended up buying a 0-20 Britool torque wrench - possibly ott but accurate for this kind of thing.
Gordon

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 Posted: 08-04-2014 04:40 pm
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Jensen Healey
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I agree with you, Gordon. Once the cam cover has been over-torqued and splayed, most of them, it will never seal at 4lb torque.

I've had good luck with the JHPS gaskets installed dry after careful cleaning with acetone, and torqued by feel. probably 8 to 10lbs.

Kurt

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 Posted: 08-04-2014 04:55 pm
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srq2002
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In fact a second one let go at about 4 ft-lbs, so all on them it is. The question is whether the back two on the exhaust side can be done with the cam tower in place...

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 Posted: 08-04-2014 07:17 pm
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gmgiltd
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Can't comment on that - UK spec is tight because of the battery tray. Would also recommend the JHPS gaskets - I got a set not because I had any leaks but because it seemed to be a good update and they work well. I would imagine that if the cam cover threads are stripped then it is more than likely that they have seen considerably more than 4lb and the covers are probably splayed - the JHPS gaskets could provide a solution.
Gordon

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 Posted: 08-05-2014 11:06 am
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Primordious
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Just a thought, it might be worth your time to pick up a 1/4" or 3/8" drive in/lb torque wrench if you don't have one already to deal with small fasteners in soft metals like aluminum. Speaking from personal experience, trying to achieve a 48 in/lb torque with the smaller scale torque wrench than 4 ft/lb on a large beam type wrench is easier for me.

Last edited on 08-05-2014 11:07 am by Primordious

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 Posted: 08-06-2014 01:18 pm
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srq2002
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I started down the helicoil road to fix the holes, to discover that you can't do it while the cam towers are on the car.

From a JH factory trained tech from back in the day:
1) The holes in the cam towers were originally drilled and tapped from the back side. This is why you will see 8 or 10 turns of thread outside of the hole on the sides of the front end ones.
2) Because of this, a drill from the top would be pushed toward the outside, resulting in a misalignment with the cam cover.
3) The helicoil insertion tool can not be put flush against a hole from the top.
4) People who try wind up with a kludged mess that still leaks.

So, I will pull the cam towers and do all 12 holes from the back.

Last edited on 08-06-2014 01:19 pm by srq2002

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