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Sportster Motorcycle Motor - Top End Discuss Sportster Motorcycle Top End issues. Rockerboxes, Valves, Cylinders, Pistons, Rings, Lift Rods, etc...

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  #1  
Old 29th January 2005
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Question Useing Cometic head gasket (torque question)

Looking at the Service manual, it has you torque the stock head gaskets to 15 ft lbs and then mark them and tighten them another 90 degrees. That completes the torqueing.

Well, the instructions Cometic and NRHS provides for the Cometic "multi-layer" gaskets is to torque them in many increments, ending in 42 ft lbs torque.

My problem is this; 3 of the 4 bolts on each head will tighten to 42 ft lbs (no problem) ... but, the rear bolt on the right side of each head (this is one of the long bolts) seems to just stretch ... On both heads, this same bolt never wants to get to 42 ft lbs torque.

I am afraid that if I keep tightening it, these 2 bolts may break.

My head bolts were lubed with engine oil prior to tightening as per the instructions.

Has anyone here used Cometic MLS head gaskets and had the same problem?

Thanks,
Ron
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Last edited by Turbota; 29th January 2005 at 17:06..
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Old 29th January 2005
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Sorry Ron. when I put my heads back on the first time with cometics I went with the standard HD torque settings. I had the 3 piece cometics which I think are the ones you are using.

Now you got me second guessing which way to go the next itme.
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Old 29th January 2005
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never come accross a problem with 'em
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Old 29th January 2005
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Here is a pic of the instructions provided by Cometic for the 3 piece MLS head gaskets: (NRHS basically says the same thing in the sheet they give you):

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Old 29th January 2005
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Wow, I only got the bare gaskets. I will follow these instructions when I put it back together this time. Thanks Ron
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Old 29th January 2005
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Here is a photo I just took of part of the NRHS fact sheet.

It also talkes about clearancing the rocker boxes:

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Old 29th January 2005
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Ok they say to check with clay...... same thing....... ya need ta check it
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Old 29th January 2005
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Well barry1967 don't feel alone, I went with the HD torque sequence too.

I didn't even think of doing it any other way or bother reading the, "instructions!"

On a positive note it doesn't seem to have hurt anything and after 7000 miles it still holding together and no leaks.
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Old 11th February 2005
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Quote:
Originally Posted by Gyahmers
Well barry1967 don't feel alone, I went with the HD torque sequence too.

I didn't even think of doing it any other way or bother reading the, "instructions!"

On a positive note it doesn't seem to have hurt anything and after 7000 miles it still holding together and no leaks.
I'm in the middle of the same thing with James gaskets...

Seems that when I get to 15 or so ft.lbs., they don't really WANT to tighten anymore...everythiung is lubed properly....I don't get it?!?! I don't want to break a stud....
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Old 11th February 2005
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And now I've found (after reading this thread) that not only does James recommend a finished torque of 38-42 ft lbs, but they also seem to have the exact opposite torquing order than my manual...

Got to 40 ft lbs easy this time in the James order, and just about 1/4 turn from the 14-15 ft lbs I stopped at torquing in the other direction following the manual...

I feel better now...

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