Boy, I sure could use some help from you "experts" out there!! I have a 1974 F-100 4-wheel drive short box, and years ago, I replaced top cover master cylinder gasket with a new one (rubber diaphram type). Years later, time has come to replace the same gasket which now is leaking again (pits in the rubber surface) and I'm trying to find a replacement.

Problem is, my records show two different master cylinders for the F-100; one is the BENDIX unit and the other is the LOCKHEED unit. It seems *real easy* to find the gasket for the Bendix unit (Ford OEM part#D2AZ-2167-A--also available from Motormite/Help products as part #42069) but my truck has the narrower Lockheed unit and dealers no longer have the top cover gasket available and don't show it. There's about a one inch difference in width between the two master cylinders and it's impossible to trim down the wider Bendix-type gasket.

Is anyone familar with the idea that Ford used the wider Bendix unit on the 2-wheel drive and the narrower Lockheed on the 4-wheel drive? Am I correct in assuming this?

I have checked with places like Dennis Carpenter Ford (they have to have the OEM part number which I don't have) and LMC truck, but to no avail.

Any help in locating this bugger would be ***GREATLY*** appreciated. Sure hate to try and replace the entire master cylinder, especially since this one is in perfect working order!

If all else fails and I want to fabricate my own gasket, HOW IMPORTANT are those expandable diaphrams? If they're not there, what could happen? Thanx

michelle

 

The expandable pockets are VERY important to allow the level to change during operation without introducing air and moisture into the fluid.

 

THANX, Eric--that's helpful to know that I *can't* fabricate the gasket myself. (sure wish I could about now)

michelle