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Thread: Stator bolts torque spec... Clymers just can't be right?

  1. #1
    look out!!! Visian's Avatar
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    Stator bolts torque spec... Clymers just can't be right?

    Clymers said 35 lb/ft.... that seems awfully high, and just as I thought I stripped the socket head of the soft allen bolts before getting anywhere close.

    Does anyone know the correct value?

    And... the joys of having a teenage MX racer in the house.... every one of my Ez-outs are broken off!

    Ian
    Go soothingly through the grease mud, as there lurks the skid demon.
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    My Chilton says 17 to 20 ft.-lbs . Seems reasonable .

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    Registered User lmo1131's Avatar
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    From Herr SnoBum's website..

    Alternator rotor allen bolt: book value is 16.6-19.5 foot-pounds, I suggest ~14 as a maximum. The rotor-to-engine-crankshaft are taper-fits. The mating surfaces must be absolutely clean & free from any contamination, including oil, even fingerprints. Do NOT use gasoline in cleaning the tapers.
    And all the rest of the torque values. > http://bmwmotorcycletech.info/torquevalues.htm
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

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    look out!!! Visian's Avatar
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    Hey, thanks Pranda... 35 just had to be too tight... given that this thing seats into the case, there seems no reason to have the bolts very tight. Sure glad I stripped the head of the bolt and not the threads in the case!

    Lew, I was talking about the stator, not the rotor... but I go easy on that, too.... considering it's the end of the crankshaft!

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    Administrator 20774's Avatar
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    35 newton-meters is 25.8 ft-lbs...are you sure the units was correct. Even if it was 35 N-m, 25.8 ft-lbs is probably too much.
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

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    Registered User lmo1131's Avatar
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    So you did. Mia culpa. Those are what, 5-6mm allen bolts (screws)?

    A couple of online look-ups show "standard" torque for a 5mm fastener lubed) to be around 12nM -or- 106 INCH pounds -or- about 8.8 FOOT lbs.

    By comparison, to put this into a context that we can all get our heads around ... a 12er of canned fermented beverage weighs just about 9-3/4 pounds. Down a couple, thus relieving about a pound and some change, hang it on the end of a 12" long stick, and you're close to realizing what 8.8 ft/lb. feels like

    Tighten the fastener. Consume the rest of the beverage.

    Here's a really handy URL to keep around > http://www.numberfactory.com/nf%20torque.htm
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

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    Visian , I apologize , I was thinking of the rotor .

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    R100GS, '89 Guenther's Avatar
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    My Clymer reads 35 inch.lbs. for the stator bolts.

    /Guenther
    Last edited by Guenther; Yesterday at 03:47 PM.

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    Registered User lmo1131's Avatar
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    35 inch lbs / 12 = 2.92 ft lbs.

    Basically, a quarter turn more, after the head just snugs down. And a tiny dab of blue Loctite if you're really worried about it.

    Or, you can pick up a 1/4" drive, inch-pound, click-type, torque wrench at Harbor Freight for about $20.
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

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    rabid reader dbrick's Avatar
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    Quote Originally Posted by lmo1131 View Post
    Here's a really handy URL to keep around > http://www.numberfactory.com/nf%20torque.htm
    Thanks, Lew. That's a good one.
    David Brick
    Santa Cruz CA
    2007 R1200R

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    look out!!! Visian's Avatar
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    Quote Originally Posted by 20774 View Post
    35 newton-meters is 25.8 ft-lbs...are you sure the units was correct. Even if it was 35 N-m, 25.8 ft-lbs is probably too much.
    Quote Originally Posted by Guenther View Post
    My Clymer reads 35 inch/lbs. for the stator bolts.
    Quote Originally Posted by lmo1131 View Post
    35 inch lbs / 12 = 2.92 ft lbs.
    I double checked that prior to my OP... it's definitely written as "35 ft-lb." in my Clymers.... wow, that is a big typo!

    I guess I have a pretty old Clymers... it's the bigger-sized book, not like the new ones.

    Yes, thanks, Lew for that link... got it bookmarked.

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    Visian,

    I want you to work on getting a sense of what Robert Pirsig described as the "mechanics feel".

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    Administrator 20774's Avatar
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    A conversion website that I frequently visit is:

    http://www.onlineconversion.com/

    Here's another utility that has been downloaded to my computer (Convert.EXE):

    http://wscope.com/convert.htm
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  14. #14
    look out!!! Visian's Avatar
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    Quote Originally Posted by 20774 View Post
    A conversion website that I frequently visit is:

    http://www.onlineconversion.com/
    Thanks... man, they think of everything these days, huh!

    Here's another utility that has been downloaded to my computer (Convert.EXE):

    http://wscope.com/convert.htm
    Whoops, Mr. Mac don't like that! Will have to download that the next time I turn on my PC.

  15. #15
    R100GS, '89 Guenther's Avatar
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    Forgot to mention: My Clymer is 2nd edition 5th print.

    /Guenther

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