73 Shovelhead Torque - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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Old 06-17-2009, 06:22 PM   #1 (permalink)
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Question 73 Shovelhead Torque

New to Harley Davidson! I have a 73 Flh and need to do the top end, I bought a 9/16" torque adapter that is 2" center to center.

I was curious if anyone could tell me what impact on the torque for the headbolts would be?
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Old 06-17-2009, 07:54 PM   #2 (permalink)
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Maybe this is what you're looking for:
http://www.millwrightmasters.com/images/torque1.gif
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Old 06-17-2009, 08:26 PM   #3 (permalink)
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my suggestion is buy the service manuel for the bike, worth its weight in gold, if not dave will know
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Old 06-17-2009, 08:30 PM   #4 (permalink)
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About 2-3 lbs more then the wrench is set at.

You can figure it out at home, by placing two bolts in a vice, and putting washers and nuts on them, and torquing one WITH the adapter, and one WITHOUT the adapter, until you get the same torque value when compared, then just add the appropriate amount when you torque the heads/jugs.

IE: If you torque them both to 40 ft/lbs, then you add the adapter, and keep turning the wrench back, until it clicks WITH the adapter on. It will take about 2-3 lbs LESS then WITH the adapter, to achieve the same torque spec, as the leverage is longer.
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Old 06-17-2009, 08:45 PM   #5 (permalink)
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This is very interesting...I am guessing this is necessitated by leaving the motor in the bike.

Was trying to understand the formula above and decided to search it out for the explanation...it can be seen at the link below. By the way: you guys with all the info are awesome.

Torque Wrench Offset
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Old 06-17-2009, 08:49 PM   #6 (permalink)
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Quote:
Originally Posted by wood butcher View Post
This is very interesting...I am guessing this is necessitated by leaving the motor in the bike.
Even on a bench, a shovelheads head bolts are tightened from the bottom UP. The jugs mount to the cases at the flange, and getting a large torque wrench in there isn't an option.

I knew there was an actual formula for it.... just didn't know where to get it. Thanks for posting it.

My last shovelhead, I rebuilt and tightened the bolts by practicing with a wrench, and checking my values against a torque wrench. The engine had 52K on it when I sold it (post rebuild) and never had an issue with my work. Luck, I guess...

It's an offset wrench that I still have today.
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Old 06-17-2009, 08:52 PM   #7 (permalink)
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Your gonna have to use a wrench to get at some of the head bolts.
I dont torq em I crank the chit outta them in a criss cross pattern as tight as I can get it the run the motor and retorqe then ride it moderatly get it good and hot and retourqe it done deal,Done it this way since a builder showed it to me and been doin it my whole life to shovels pans and sportys.Use copper gaskets and indian head gasket sealer done.
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Old 06-18-2009, 12:07 AM   #8 (permalink)
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Talking Torque

Thank You All.... I am so glad that I joined this forum!!!!!

YOU ROCK!!!!
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Old 06-21-2009, 08:03 AM   #9 (permalink)
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I know this won't sound very technical but ... If you torque shovel heads the head gaskets will blow out shortly . Clean the bolt and hole threads and crank them down in sequence till you think you're gonna break the wrench , then keep doing that for a week till you can't get them any tighter ! Use the good James gaskets too . Told ya it wouldn't be very technical !
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Old 06-21-2009, 08:13 AM   #10 (permalink)
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Then heatcycle it and retighten.Copper gaskets with indian head sealer never fails.
Also a little oil or neverseize on the head bolt treads so they dont gaul.
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