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Rotor/Caliper Clearance Inconsistant - Girling (Sorry, a bit long) 1800 1973

posted by  Chris Mullet on  Wed Mar 11 10:47 CST 2015
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last visit: Fri Oct 24 09:08 CST 2014
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For one reason or another I had to replace the rear calipers on my 73 1800ES with a pair off of another ES parts car. Upon assembly of the RH side, I discovered serious interference between the caliper and the outboard rotor surface. Once I tightened the caliper bolts I couldn't budge the rotor in either direction. My first inclination was that the rotor wasn't sitting all the way home so I removed it and made darn sure all mating surfaces on both the rotor and the hub were clean. The rotor is easily sliding all the way home as witnessed by the two large holes in the rotor through which I can verify there is no gap between the rotor and hub. I bolted the rotor in place with the lug nuts and stacking three washers on each stud. I ground out the I.D. of the washers to assure that they wouldn't hang up on the stud tappers before they push the rotor all the way home. I tightened the lug nuts progressively to a "significant torque". There are no shims present between the caliper and backing plate. (Having a shim in place would make the interference worse.)

I pulled the replacement caliper back off of the car and compared it side-by-side to the original one. The part numbers read the same however I found roughly a 0.040" variance in the distance between the caliper/backing plate mating surface and the offending outboard surface inside the caliper "slot". Neither caliper appeared tampered with as I could still see the machining marks on the mating surfaces.

Other info: The rear axle in the car is the original for an auto trans. The parts car was a manual trans and appeared to be a very early 1972. Also, I had a bit of the same issue with LH side, however that one was cured by extra cleaning of the rotor/hub interface and torquing the rotor home. (The LH side is a tighter fit than the RH.)

But even so, the caliper part numbers are identical.

So, has anyone ever run up against this? Also, was it common for the Girling calipers to have that much variance in their dimensioning?

Thanks for taking the time to read this ramble.






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New Rotor/Caliper Clearance Inconsistant - Girling (Sorry, a bit long) [1800][1973]
posted by  Chris Mullet subscriber  on Wed Mar 11 10:47 CST 2015 >


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