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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 07-01-2013, 08:36 AM   #1 (permalink)
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Valve cover bolts stripped

Damn!!
I was replacing the gasket and washers on my 2001 Bonneville valve cover as it has developed a leak after all these years. Anyway as I was torquing down the bolts to 10nm as stated in my Haynes manual, alternating R front, L back, L front, R back gradually getting tighter I felt L back strip.(insert expletives here)
What are my options from here?
Will it still be okay to ride with the other 3 bolts torqued down?
I have never applied a heli coil which is what I presume will be my best option, is it difficult? And will it be more or less reliable than the original useless threads?
Thanks in advance

Tom.


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Old 07-01-2013, 08:40 AM   #2 (permalink)
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The torque setting for the cam cover was changed to 14Nm. I would bet money that the cover is going to weep on you even with three torqued down and one on the loose side. Do you have an impact wrench you can use with a heat gun? Get it loose and you can always order a new set of cam cover bolts...is the head on the cam cover bolt that stripped or the thread going into the cam holder?
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Old 07-01-2013, 12:16 PM   #3 (permalink)
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Quote:
Originally Posted by Tomjukic View Post
I have never applied a heli coil which is what I presume will be my best option, is it difficult? And will it be more or less reliable than the original useless threads?
Helicoil repair is a very good way to fix the stripped thread in those caps. It will actually result in a stronger thread (when done properly) than the original thread.

It is not hard to do. Using a drill press is best to make sure that you get the new thread square. You have to lightly drill out the old thread. Then use the drill press to hold the tap for the repair, and turn the chuck by hand to start cutting the thread on the cap. Then you can take the tap out and finish by hand - this way the thread is square.
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Old 07-01-2013, 03:25 PM   #4 (permalink)
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Good Helicoil repair thread here:

http://www.triumphrat.net/twins-tech...p-threads.html
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Old 07-01-2013, 06:27 PM   #5 (permalink)
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Thanks, I went for a short ride to work this morning and so far no leak, but I would like to get it fixed properly. I will have to get me a helicoil kit.
Is there really no way to replace the cam holder bracket without replacing the whole cylinder head? Surely one of the CNC guru's could make something like that, or is there more to it?


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Old 07-01-2013, 06:51 PM   #6 (permalink)
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What do you mean by the cam holder bracket?
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Old 07-01-2013, 07:45 PM   #7 (permalink)
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I meant the cam cap, this thing;
Valve cover bolts stripped-imageuploadedbymo-free1372718601.725049.jpg
Couldn't think of the name


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Old 07-01-2013, 07:49 PM   #8 (permalink)
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Quote:
Originally Posted by P-twin View Post
is the head on the cam cover bolt that stripped or the thread going into the cam holder?
Unfortunately it's the cam holder thread.


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Old 07-01-2013, 08:10 PM   #9 (permalink)
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Quote:
Originally Posted by Tomjukic View Post
I meant the cam cap, this thing;
Attachment 70482
Couldn't think of the name


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On that holder there are three sets of threads...two on each side and the one in the middle. It is the one in the middle that stripped on you correct? If that is the case then I would definitely get it helicoiled...I think that is your best option. Keep in mind the center thread on that holder is for the cam cover bolt to thread into. You could even ride it into a garage if you are not comfortable doing the job yourself but I think you will be fine. Put in helicoil on youtube and you will get full blown demonstrations on how to do it.
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Old 07-01-2013, 09:34 PM   #10 (permalink)
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Quote:
Originally Posted by Tomjukic View Post
I meant the cam cap, this thing;

Couldn't think of the name
Ah, yes. Well those are machined while bolted to the cylinder head. So it would not be impossible to make a replacement one, but would be very difficult to get the camshaft journal accurate and matched - not impossible, but difficult.

But really, just helicoil the thread. The helicoil will actually be stronger than the original thread, it is a very good repair.
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