What pressure is correct for gearbox-oil-pump ?

The filter is indeed after the pump, and therefore of minimal use. The reason is that the original casting uses all internal passages for the plumbing from the pump to the upper shaft. When the pump was added the output passage was plugged at the top and a tapped hole provided at the bottom. That's where that funny little 90 degree elbow fits.

Some owners have done innovative work in installing a filter before the pump. Ethan Turner is one of these. He will be showing and telling other Cord owners how he did this in an article in the Newsletter this fall.

I thought that the Puralator-filterb is before the oilpump ??!!
In case it is not before, can't it be plumed in before the pump ?
Is the Puralator- mesh too small and will clog to fast ?

What you heard from Henry is OK in my book, however we all know that oil is feed from the bottom of the trans, this trans oil is not fiiltered. It only gets filtered when the oil has gone thru the pump, all the pessure in the world from the oil pump will get it's life suked out, if the gears get a peice of metal caught there, there goes your expensive oil pump. So what I propose to all of you is filter the oil coming from the trans before it gets there. I have moderfied many a pump with this modification. It's proven to work over 35 years in use. Will make a drawing of this and submit it to Josh.

When the trans was first designed it had no filter,the pumping of oil to the main shaft was an internal design. Auburn engineers felt a filter was needed so one was added, but only after the pump, then they went bust.

I have a gauge on my transmission and it runs about 45-50lbs when cold and drops to around 10 when hot.

Bill McLaughlin
Cord 812

While one can never argue technical stuff with Henry, I do remember many decades ago asking the late, great J.K. Howell the same question: "How much oil pressure is needed from the tranny oil pump". His answer: "Any".

I use an "idiot light" to indicate the the pump is producing pressure. Its points open at 4#. With Henry's pump installed the light goes off with the first few turns of the road wheels.

Jim, Transmission pumps I set with air pressure. I often have trouble with it leaking before it gets to the full-unload pressure & have to lap the seat. The same with the engine oil pump but I usually recheck them with oil also. Henry

Henry,

When you set the relief valve, do you set it with air or with oil pressure?

Jim

Hi Henry manny thanks for your advise and quick replay.
It's always grate if one not need to do the trial and error again if someone
like you has gained the experience before and is willing to pass your knowledge to a newer generation of Cord enthusiast's.
Manny thanks, Philipp

Philipp, When I rebuild the oil pump I attach a 5/16" plate to the front of the pump body & bore to fit new gears that are twice as long (5/8") as the original gears (5/16") & set the valve to relieve @ 50 to 60 lbs. Usually it will maintain more than 25 lbs. when hot.

Hello fellow Cordian's,
who can tell me what the correct gearbox-oil-pump pressure setting is when a 90 grade oil is used.
Thanks in advanced, Philipp