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Author Topic: Torque 25 Foot Pounds for Caliper Banjo Bolts?  (Read 2921 times)

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boingmotorsports

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Torque 25 Foot Pounds for Caliper Banjo Bolts?
« on: May 16, 2006, 11:32:25 pm »
Application - 2001 Honda CBR 600 F4i
I just broke both front brake caliper banjo bolts, because I was torqing them to 25 foot pounds like the service manual said to. I thought it was a misprint, but I looked in my F3 and RC51 manuals and they all said the same. Well I ordered two more. What should I torque those to? I don't want any oil leaking. New crush washers and everything...
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GSXR RACER MIKE

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Re: Torque 25 Foot Pounds for Caliper Banjo Bolts?
« Reply #1 on: May 17, 2006, 02:33:34 am »
Your saying you physically broke the bolts in 1/2? (steel bolts broken off in an aluminum part with 25 ft./lbs. of pressure?) Or did you strip the threads on them? In either case, are you sure you didn't look at the wrong guage on the Torque Wrench and go to 25 N-M (Newton Meters) instead? Newton Meters are roughly 1/2 again more pressure than Foot Pounds of an equal amount (example: 1 N-M vs. 1 Ft. lb.). I also wonder if you didn't strip the aluminum part out? (it was aluminum correct?)

I need more info before I speculate on a cause. Were you working with ALL of the original equipment that came on the bike originally or were you dealing with some or all aftermarket parts? Also was this just reassembling what was already on the bike or were you replacing/upgrading ANY parts? Aftermarket parts can have different torque specs than stock, also with the influx of China made immitation crap you have to be careful of what your buying nowdays (example: if you had just changed banjo bolts). In the past I saw some knock-off aluminum banjo bolts, were the banjo bolts that broke made of steel? If they were aluminum their toque spec would have been much lower.
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cardzilla

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Re: Torque 25 Foot Pounds for Caliper Banjo Bolts?
« Reply #2 on: May 17, 2006, 07:09:51 am »
My guess is you were installing steel lines?  Those usually come with aluminum bolts which you just can't torque as much as stock ones.  I think everyone has experienced this once in their lives, don't feel bad.  Use a quarter inch drive and snug them down with new crush washers... use your feel vs. the torque.  Check to make sure there are no leaks and if not, leave it at that.
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Larry Dodson
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Re: Torque 25 Foot Pounds for Caliper Banjo Bolts?
« Reply #3 on: May 17, 2006, 09:08:08 am »
I made a twizzler out of an aluminum banjo bolt trying to torque it to factory specs.

Talked to the MFR and they said 10 lbf-ft max.  Just enough so it doesn't leak.  That freaked me out so I safety wired the whole shebang to ensure it stayed put.
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hotrunner

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Re: Torque 25 Foot Pounds for Caliper Banjo Bolts?
« Reply #4 on: May 18, 2006, 04:10:47 pm »
 
Newton Meters are roughly 1/2 again more pressure than Foot Pounds of an equal amount (example: 1 N-M vs. 1 Ft. lb.). .

Actually the same amount of torque measured in Ft LB & Nm will end up with the Nm as higher ex: 18Ft. Lb=25Nm where 25 Ft. Lb = 34Nm
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GSXR RACER MIKE

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Re: Torque 25 Foot Pounds for Caliper Banjo Bolts?
« Reply #5 on: May 19, 2006, 03:57:12 am »

Actually the same amount of torque measured in Ft LB & Nm will end up with the Nm as higher ex: 18Ft. Lb=25Nm where 25 Ft. Lb = 34Nm

Absolutely correct.

I started writing that a different way and didn't go back and get it fully corrected after I copy and pasted around the original way I wrote it - so much for my normally good proof reading before posting! LOL. What I meant to say in so many words was "is it 'listed' as Nm and did he go to Ft Lbs instead?" Then what should be 25Nm (18 Ft. Lbs.) would end up 25 Ft. Lbs. (34Nm).

Thanks for the correction, great catch! :thumb:
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