1978 GL1000 swingarm bearing torque specs.


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pshaginaw
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1978 GL1000 swingarm bearing torque specs.

Postby pshaginaw » Fri Dec 09, 2011 4:25 pm



Both the Climer Manual and the Honda Shop Manual download call out the following: Install the swing arm piviot bolts by counting the number of turns each is turned with an Allen wrench until they are each in the same number of turns. (I did 31 turns each.) Then torque the left side piviot bolt to 7.25 ft-lbs (10Nm) and back off 1/8 turn. WOW! isn't this a bit much? I set my torque wrench to 9Nm and the socket holding the Allen head broke before the wrench even clicked! At that point I could'nt even budge the swingarm, so I backed off the piviot bolt until the arm moved freely. Then both Manuals said to torque the locknuts to 12ft-lbs while holding the piviot bolts firmly. Even though the locknuts are 30mm, I was scared to touque them that much, so I just snugged them down until I could feel increased resistance on the play of the swingarm. Since this is a restoration project, all the parts were cleaned, inspected, and greased properly before reassembly,new bearings were installed. Can anyone help me with setting up the swingarm safely without having it bind up by over-torquing?



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scotterichmond
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Re: 1978 GL1000 swingarm bearing torque specs.

Postby scotterichmond » Fri Dec 09, 2011 4:48 pm

7.25 ft.lbs. ? Are you sure it isn't in.lbs.

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Re: 1978 GL1000 swingarm bearing torque specs.

Postby WingAdmin » Fri Dec 09, 2011 4:57 pm

pshaginaw wrote:Both the Climer Manual and the Honda Shop Manual download call out the following: Install the swing arm piviot bolts by counting the number of turns each is turned with an Allen wrench until they are each in the same number of turns. (I did 31 turns each.) Then torque the left side piviot bolt to 7.25 ft-lbs (10Nm) and back off 1/8 turn. WOW! isn't this a bit much? I set my torque wrench to 9Nm and the socket holding the Allen head broke before the wrench even clicked! At that point I could'nt even budge the swingarm, so I backed off the piviot bolt until the arm moved freely. Then both Manuals said to torque the locknuts to 12ft-lbs while holding the piviot bolts firmly. Even though the locknuts are 30mm, I was scared to touque them that much, so I just snugged them down until I could feel increased resistance on the play of the swingarm. Since this is a restoration project, all the parts were cleaned, inspected, and greased properly before reassembly,new bearings were installed. Can anyone help me with setting up the swingarm safely without having it bind up by over-torquing?


I had a look at the GL1000 swingarm specs in the Honda service manual. The specifications for the rear swingarm locknut is 58 to 87 ft-lbs. 7.25 ft-lbs is correct for the pivot pin.

That aside, 7.25 ft-lbs is a VERY negligible amount of torque. You should be able to tighten to 7.25 ft-lbs easily using just one finger on your torque wrench, and you certainly should never be able to break a socket with that much torque. I suspect that you may be setting your torque wrench incorrectly.

Here's what the Honda manual says:

Inspect the pivot bolts for damaged bearing surfaces or threads. Run both pivots in until only two threads extend through the lock nuts.

Torque the left pivot (to 87 inch-lb, or 7.25 ft-lb), and then back it out 1/8 turn. Check the swing arm for freedom of movement. If binding is felt, or if the arm will not move up and down freely, back out the pivots and check the condition of the bearings.

Torque both lock nuts (to 58-87 ft-lb) and recheck the swingarm for freedom of movement. NOTE: Do not allow the pivot bolt to turn when tightening the lock nut.

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scotterichmond
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Re: 1978 GL1000 swingarm bearing torque specs.

Postby scotterichmond » Fri Dec 09, 2011 5:44 pm

I set my torque wrench to 9Nm and the socket holding the Allen head broke before the wrench even clicked!



I wonder if maybe the torque wrench is at fault here?

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Re: 1978 GL1000 swingarm bearing torque specs.

Postby WingAdmin » Fri Dec 09, 2011 6:19 pm

scotterichmond wrote:I set my torque wrench to 9Nm and the socket holding the Allen head broke before the wrench even clicked!

I wonder if maybe the torque wrench is at fault here?


9 N-M is about 7 ft-lb, so think about this - if your torque wrench is about 2 feet long (as mine is), in order to apply 7 ft-lb of torque, you need to apply 3.5 lb of pressure at the end of the torque wrench. That's really not very much pressure at all. You should be able to apply 7 ft-lb of torque to a fastener using a screwdriver. There's no way a socket should break at that amount of torque.

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pshaginaw
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Re: 1978 GL1000 swingarm bearing torque specs.

Postby pshaginaw » Sun Dec 11, 2011 4:06 pm

Thanks to all of you who replied to my inquiry. I took everything apart and started all over, this time paying close attention to how I set my torque wrench, and this time I encountered no difficulties. I have no idea what I did wrong on the first attempt, but I appreciate the help as it got me to focus and get it right!




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