-78 rear end troubles - carrier bearing spun??

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Nut124
Posts: 19
Joined: Wed Oct 25, 2017 6:39 pm
Your car is a: 1978 124 Spider 1800

-78 rear end troubles - carrier bearing spun??

Postby Nut124 » Mon Dec 04, 2017 12:56 pm

Has anyone else seen this or fixed it?

I have blown two rear ends. They both failed the same way at hard launch with sticky tires. The carrier bearing journal shears off on the ring gear side.

Upon examining the damage I have found that the outer races of the carrier bearings had spun to the point where there is grooving wear on the outside of the race. I'm not sure if the spun bearings contributed to the failure or if some of the spinning happened after the failure while towing with tons of metal debris in the oil.

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Nut124

Nut124
Posts: 19
Joined: Wed Oct 25, 2017 6:39 pm
Your car is a: 1978 124 Spider 1800

Re: -78 rear end troubles - carrier bearing spun??

Postby Nut124 » Tue Dec 05, 2017 8:27 pm

OK, this is what I did - let me know if you think this is crazy.

I used a cutting wheel to cut v-shaped grooves to the outer races. Then drilled and tapped a set screw hole in the bearing caps. Installed a tapered tip set screw. The groove in the race was aligned with the holes but the screw was not installed until after gear lash and bearing preload were set.

If this rear end blows, it will a different failure moe than the two previous ones.

Thoughts?

Nut124

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