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06-17-2009, 06:22 PM
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#1 (permalink)
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Junior Member
Join Date: Jun 2009
Location: Michigan
Posts: 4
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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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06-17-2009, 07:54 PM
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#2 (permalink)
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Member
Join Date: Aug 2008
Location: Alabama
Posts: 58
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06-17-2009, 08:26 PM
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#3 (permalink)
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when did it start 4u
Join Date: Mar 2009
Location: Knoxvegas
Posts: 1,143
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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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1988 FLHS with HACK
2004 Sportster
2006 GTO with idle problem 
2008 WRX (DD)
The HERD 00046
A great man once said
" you better keep your traps shut, bc you know what they say, People in glass houses sink ships"
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06-17-2009, 08:30 PM
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#4 (permalink)
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Mentally unstable.
Join Date: Jun 2008
Location: Pennsyltucky
Posts: 6,627
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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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HERD meber #10
DISCLAIMER: Any information, advice or child raising tips I give on this forum should be taken with a grain of salt, 8 hours sleep and at least 6 beers.
Following my instructions will likely lead to death, mental retardation and/or bodily injury, consistant with eating lead-based paint chips, and by doing so, will release me, my family and my dog from any legal action(s) for listening to anything I recommended.
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06-17-2009, 08:45 PM
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#5 (permalink)
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Member
Join Date: May 2009
Location: Statesville, NC
Posts: 69
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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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06-17-2009, 08:49 PM
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#6 (permalink)
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Mentally unstable.
Join Date: Jun 2008
Location: Pennsyltucky
Posts: 6,627
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Quote:
Originally Posted by wood butcher
This is very interesting...I am guessing this is necessitated by leaving the motor in the bike.
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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.
__________________
HERD meber #10
DISCLAIMER: Any information, advice or child raising tips I give on this forum should be taken with a grain of salt, 8 hours sleep and at least 6 beers.
Following my instructions will likely lead to death, mental retardation and/or bodily injury, consistant with eating lead-based paint chips, and by doing so, will release me, my family and my dog from any legal action(s) for listening to anything I recommended.
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06-17-2009, 08:52 PM
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#7 (permalink)
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CHOPPA RIDN MADNESS
Join Date: Sep 2008
Location: In a van down by the river
Posts: 5,630
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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.
__________________
Nothing better than downing beers and throwing lead.
Except riding my Sled. 
"If you treat me good,Ill treat you better.
If you treat me bad Ill treat you Worse."
Lifes journay is not to arrive at the grave safely
in a well preserved body,but to skid in sideways,totaly worn out,shouting"Holy Shit what a fukin ride"...
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06-18-2009, 12:07 AM
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#8 (permalink)
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Junior Member
Join Date: Jun 2009
Location: Michigan
Posts: 4
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Torque
Thank You All.... I am so glad that I joined this forum!!!!!
YOU ROCK!!!!
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06-21-2009, 08:03 AM
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#9 (permalink)
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senior citizen
Join Date: Jun 2009
Location: Port Washington , WI
Posts: 700
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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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06-21-2009, 08:13 AM
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#10 (permalink)
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CHOPPA RIDN MADNESS
Join Date: Sep 2008
Location: In a van down by the river
Posts: 5,630
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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.
__________________
Nothing better than downing beers and throwing lead.
Except riding my Sled.
"If you treat me good,Ill treat you better.
If you treat me bad Ill treat you Worse."
Lifes journay is not to arrive at the grave safely
in a well preserved body,but to skid in sideways,totaly worn out,shouting"Holy Shit what a fukin ride"...
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