Rear Caliper What a Farking Derailed Project

[RAT900]

2002 900ie Monster

High Mount (above axle type) rear brake caliper plate

Replaced rotted old caliper with frozen piston

with shiny new caliper

24-25 NM spec for the caliper mounting bolts

Set trusty microclick torque wrench

The rear hole on the mounting plate stripped right out a good bit before I got to 24 NM

the forward mount hole finally got to 24 but my instincts were screaming that it was going to strip

WTF? 24 NM seems like it is a lot of torque to throw on that aluminum mounting plate assembly...is that accurate??

so anyway the damage is done

is a heli-coil a workable solution for this stripped out hole? 

or am I tracking down a new caliper mounting plate?

I am having NOT a lot of fun learning the ins and outs of this particular Monster

my 96 was a lot more cooperative

[DarkStaR]

I know you probably checked, but still have to ask.  You sure it was NM on the tq wrench?

If so, if it's not the aluminum, is it possible your tq wrench is not calibrated.

I had messed up porsche rod bolts with a BRAND NEW craftsmen tq wrench long ago.

[silversled]

24 NM is not a significant amount of torque.  Either 24 ft-lbs was mistakenly applied or the torque wrench is out of calibration.

Don't bother with cheap wrenches.  Snap-On or CDI are the only things I use.  A used Snap-On off E-b-a-y is better than a new Craftman in my books. 

[DarkStaR]

Don't bother with cheap wrenches.  Snap-On or CDI are the only things I use.  A used Snap-On off E-b-a-y is better than a new Craftman in my books.  

Agreed.  

Where/When did you get the caliper plate?

[TAftonomos]

Arn't you supposed to be measuring stretch on rod bolts, and not torque? 

[RAT900]

It was a Sears with the NM on one side and the Ft./lbs on the other

actually it was TWO Sears micro-clicks....I have one in inch/lbs with NM on the reverse and my old Ft./lbs one with NM on the reverse

I started with the smaller one and did not like how things were going/feeling so I switched over to the larger one to see if that would render the click

and I set it on the NM side both times both wrenches

and double-checked against my "inner moron" as I know he loves to help whenever possible

The bolts would not "get home" wherein you hit that end-of-the-line resistance and then go for the click....they just kept yielding to pressure

well I have heli-coils on the way and I will rethink my torque  and instead will get it locked up tight by white-knuckle gauge and use locktite on the threads

this sucks...

[DarkStaR]

Arn't you supposed to be measuring stretch on rod bolts, and not torque? 

I read about the differences between the 2 methods, and agree, but the workshop manual I was working with at the time did not mention any specs for stretch. 

[Speeddog]

24 N-m is the spec.

I've never had any of 'em go bad torquing to that.

Threads were likely buggered already.

Helicoils will work, I prefer Time-serts.

I wouldn't use locktite with a Heli-coil.

[Some Dude]

I Have a bracket from an 02 620 I parted out a few years ago.  It's yours if you want to pay the shipping on it.

[RAT900]

24 N-m is the spec.

I've never had any of 'em go bad torquing to that.

Threads were likely buggered already.

Helicoils will work, I prefer Time-serts.

I wouldn't use locktite with a Heli-coil.

I think this may be the case with the threads being compromised somehow and I probably need to get my Micro-clicks tested

yes I think the heli-coils will preclude the need for thread-locker and I recall that they are said to be a stronger assembly than stock when done right

it has been 10 years since I used them restoring old Brit bikes...which this bike is reminding me of....

seems every project looks as simple as pulling a loose thread on a sweater 

[RAT900]

I Have a bracket from an 02 620 I parted out a few years ago.  It's yours if you want to pay the shipping on it.

Thank you for the offer...I would jump right on that

but I fear we have 2 different axle sizes between the 620 and the 900ie

My personal garage-dwelling torment has the larger (25MM?)  hollow axle

and I believe the 620 used the older style solid axle (17MM?)

hopefully someone can clear up if they are a straight swap if they are I will shoot you a PM

thanks again for the generous offer

[Howie]

24 Nm is the spec, and is reasonable for an 8 mm fastener.  My guess is the threads were pre buggered for you.  Heli Coils, or even better, Time-Serts will work, I check on the price and availability of the bracket first, though.

[Speeddog]

'02 M900 and '02 M620 caliper bracket are the same.

[RAT900]

Thanks SD

oh and I found the problem.....PRIOR Heli-Coil job

just dug out the threading remnants of the coils   

[Speeddog]

Imagine that, a Helicoil job that went bad.