KMS Differential Questions

[Morris]

Originally Posted by CompClassics

Picked up the differential today. I’ll post photos later.

Riverside racer,

The pinion vent is tapped 1/2” x 14 NPT

That’s so you can use a -8 AN hose to run cooled oil back on the Pinion Bearing....like I said .....that is a return line to the rear end from the cooler.....

Vent lines are -6 AN and use 1/4” NPT.......on the transmission and rear end....

[patrickt]

Speaking of Powr-Lok break in (which no one was, but who's counting), Jaguar released an interesting service bulletin back in the early 1960's specifically advising not to do the recommended differential oil change at 500 miles if you had a Powr-Lok (which they had always prescribed up until then). Now, if you've gone to the trouble of having your Jag rear diff rebuilt by super-pros then, by all means, follow their directions for break in and not a 50 year old service bulletin. I don't think they even had climbing gear lube back then much less friction mods specified by today's rebuilders. Regardless, here it is should anyone ever ask you about it, which they won't.

[CompClassics]

Originally Posted by Morris

That’s so you can use a -8 AN hose to run cooled oil back on the Pinion Bearing....like I said .....that is a return line to the rear end from the cooler.....

Vent lines are -6 AN and use 1/4” NPT.......on the transmission and rear end....

Morris,

I agree with you about it being the return line for the differential cooler, that is the way I have my car plumbed. I also changed out the differential cover on my car very early on when the Kirkhams mistakingly putting jeep covers with the higher oil capacity that were leaking everywhere to a proper Jaguar cover.
Because of the lack of an oil deflector on the billet aluminum cover that Kirkham supplied with this differential it seems to be the most feasible spot for a differential breather in this circumstance.

When I picked up the differential from the rebuilders they had reinstalled all of the differential mounts except the pinion support mount, they felt that someone had compromised the mounting breaker holes and that they might pull through, why would someone have done this on a purpose built part?

[David Kirkham]

Originally Posted by CompClassics

Morris,

I agree with you about it being the return line for the differential cooler, that is the way I have my car plumbed. I also changed out the differential cover on my car very early on when the Kirkhams mistakingly putting jeep covers with the higher oil capacity that were leaking everywhere to a proper Jaguar cover.

Actually it wasn't a mistake. The differential covers with the hole in the Cobra location (lower) have not been available for a long time now. The jeep covers are also much thicker so they tend to hold the back of the differential case together better than the original covers which were quite thin (they are only something like 1/16" thick). We ultimately decided to billet the covers for a variety of reasons, the most important being we were able to put the fill hole in the right location.

Originally Posted by CompClassics

Because of the lack of an oil deflector on the billet aluminum cover that Kirkham supplied with this differential it seems to be the most feasible spot for a differential breather in this circumstance.

If anyone can figure out how the billet in the deflector I'd LOVE to hear!!!

Originally Posted by CompClassics

When I picked up the differential from the rebuilders they had reinstalled all of the differential mounts except the pinion support mount, they felt that someone had compromised the mounting breaker holes and that they might pull through, why would someone have done this on a purpose built part?

I'm really surprised at the size of those holes???

David

[CompClassics]

Originally Posted by David Kirkham

Actually it wasn't a mistake. The differential covers with the hole in the Cobra location (lower) have not been available for a long time now. The jeep covers are also much thicker so they tend to hold the back of the differential case together better than the original covers which were quite thin (they are only something like 1/16" thick). We ultimately decided to billet the covers for a variety of reasons, the most important being we were able to put the fill hole in the right location.



If anyone can figure out how the billet in the deflector I'd LOVE to hear!!!


I'm really surprised at the size of those holes???

David

I was amazed as well that someone could have that kind of work ethic, really makes me worry about the rest of the “roller” construction that was completed prior to purchase. I do believe however that it is the installer of the Shelby American supplied parts to complete the “roller” here in the United States by Hillbank that is the one responsible for the shoddy work ethics. This is the same chassis that I had previously started a thread on regarding knowing how to select the proper hardware for the application a while ago.

Per your inquiry on matching a deflector in the billet differential cover. Why not CNC or fold a deflector up out of sheet aluminum and then weld it in place? You have an abundance of people capable of welding aluminum. It won’t detract from the external appearance either.

How many people like seeing this much oil plus whatever overflows out of the catch can not inside their differential while driving, this is a pint container?