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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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post #1 of 17 (permalink) Old 04-20-2017, 05:12 PM Thread Starter
Minitwins
Main Motorcycle: '72 Bonneville
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Silly question

Hi there,

I've pulled my rocker boxes off my 72 bonneville to check the tension of the head bolts.
Now I am trying to reassemble the rocker boxes and I can't seem to be able to get my torque wrench on the 3 underside nuts to tension them to 5ft pounds of torque. The head fins seem to get in the way even to get a socket on. I removed them with a spanner..

If you have no idea what i'm taking about I can supply photos. Thanks
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post #2 of 17 (permalink) Old 04-20-2017, 05:28 PM
wol
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there is no way to get a "regular" torque wrench on those nuts - you just have to use an open ended spanner and lightly tighten them
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post #3 of 17 (permalink) Old 04-20-2017, 06:01 PM
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I would also fit a locking washer on those 3 nuts.I changed mine to stainless steel nuts a few years ago and with the washers,they have stayed put.Just use the hand spanner as its not a crucial nut for exact tension.I tend to use short spanners when studs are set into alloy and not had any threads strip anywhere on my engine yet.

Now,where did that bit fall off ?
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post #4 of 17 (permalink) Old 04-20-2017, 11:06 PM
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Yeah, tighten it till a little bit before it strips!

hee hee

"you'll know when"

(takes years of practice, and a few stripped ones)

The lockwasher idea is a good one.

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post #5 of 17 (permalink) Old 04-20-2017, 11:23 PM Thread Starter
Minitwins
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thanks, It has nyloc nuts but some washers won't hurt
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post #6 of 17 (permalink) Old 04-20-2017, 11:27 PM
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Make sure the nylon part of the nut still reaches the thread if you add thicker washers .
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post #7 of 17 (permalink) Old 04-21-2017, 05:19 AM
wol
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I keep meaning to see if nyloc "half" nuts are available for these fixings -
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post #8 of 17 (permalink) Old 04-21-2017, 06:37 AM
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Quote:
Originally Posted by wol View Post
I keep meaning to see if nyloc "half" nuts are available for these fixings -
Hi Wol.



Nut 14-0301 1/4" 28 UNF

http://www.classicfasteners.com.au/half-nuts/

http://www.anzor.com.au/stainless-st...am-nut/product

Last edited by Rod Rocket; 04-21-2017 at 06:40 AM.
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post #9 of 17 (permalink) Old 04-21-2017, 08:31 AM
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The original washers were almost foil like compared to off the shelf.
I replaced mine with stainless but then fitted new thin ones


Do you need to remove the rockers to check the head torque? You don't on a t140
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post #10 of 17 (permalink) Old 04-21-2017, 09:58 AM
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If you're not comfortable with the "that's about right" method, you can use a crowfoot wrench for most places that you can't fit a socket. There's a small conversion formula for using anything but a socket with a torque wrench, but for a value as small as 5 ft/lbs it would be negligible.
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