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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 14th July 2008
m15063 m15063 is offline
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Default Torque Specs

I'm going to need torque specs on the following:
Shifter pawl support
Trap door bolts
clutch hub nut
sprocket nut
As I don't own a manual just a parts book.
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Old 14th July 2008
Campsurf Campsurf is offline
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clutch hub nut
sprocket nut

These are both the same in my two books (FM and Clymer).. one book lists 150 ft/lbs.. another says 100-120 ft/lbs.

When I did my sprockets I set them at 120 ft/lbs, both have a 75 cent clip that need to be replaced each time the tabs are bent over..

Be real careful on the trap door or any of the case holes, those holes like to strip out..

Shifter pawl support
Trap door bolts

I snug these up at 20-30 ft/lbs with red loctite. I say this because you need to look at the threads when they are removed to see it any of the internal threads are on them.. it so chase those holes and clean them out. I have some heli-coils in my cases because of over tightening by the previous owners...

Jim
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Old 14th July 2008
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IronMick IronMick is offline
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Quote:
Originally Posted by Campsurf View Post
Shifter pawl support
Trap door bolts

I snug these up at 20-30 ft/lbs with red loctite ...
Can you or the next guy get these out OK? Do you really need red loctite? Does the FM call for that? I always say that there is no place on these bikes where red loctite is appropriate, but i have never been into these particular parts.
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Old 14th July 2008
Campsurf Campsurf is offline
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Mick you are right... the red stuff is a bear to break loose (if you use a lot on the bolt).. use blue or none.. I think all of us have developed our own techniques over the years.. many guys say don't use RTV, I use it all the time with impunity... and I know the reasoning behind it... because when I say a "little"... to some one else they really don't know what a "little" is until they see ME do it... and a little to some one else might be a whole lot to me...


Now, when I say a little ... I use a tooth pick and put a little on it (a half a drop is too much).. I have never had a problem getting them loose. I never put it all the way around the bolt, just a smidgen on one spot then put it in.. also don't clean the bolt "dry" , leave the surface oil on it by just wiping them off with a shop rag... Mick you are right about red loctite.. when in doubt don't use this stuff... heating the bolt then letting it cool helps break a stubborn bolt loose...

The other thing about torques.... after working on old motorcycles you get a feel for tightening bolts... I know my head bolts are 65 lbs... but I have put them back together without a torque wrench so many times I've lost count and have never had a problem. I don't think they used too many torque wrenches in WWII on the HD 45s and Indian Scouts, They were designed for field use in battle and simplicity..

...I believe the torque specs are guides and not absolutes.. there is always a plus or minus factor.. An EVO Motors is different.. the whole thing is put together with a torque wrench and the specs should be adhered to religiously.. plus the factory manual for Evo's is a whole lot better than my 1970 FM ..

My FM doesn't give torque numbers for the trap door. I also know about bolts in the primary flopping around from the adjuster. I really don't think a lot of my FM and the way it is put together and the way it says to put things together. "Assemble is the reverse order"... WTF good it that? Try assembling the push rod cover clips in the "reverse order"... My Factory Manual "assumes" the reader has been to school or has served an apprenticeship... The Clymer or if you can get a Glenn's (out of print) are better at describing things with pictures than the Factory manual..

My Clymer manual has the torque specs I use. and I can't find it.. (cleaned up my garage on Friday) You don't need any loctite on the trap door bolts but my tranny is old and I don't want it to come loose until I say so... try finding parts for a 1970 tranny... the parts lists end at 1969 and skips 1970 and goes right to 1971..I have already had problems finding a clutch hub. Many of the parts in my tranny and clutch are not made anymore... not even after market..

I don't want to throw anyone off with info that is contrary to the Gospel of Harley Davidson... do you take a torque wrench with you when you are going on a trip? What is the torque of the rear axle bolt? There is a specification... but nobody uses it... they just know what it is from doing it...

JJ
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