Next message: Geo. Brooks, N7HPE: "T&T: Re: Blown Transmission"
Bob,
I believe that most tranny heat exchangers are in the raw water circuit
therefore the pressure from the water is minimal. Since the oil from the
transmission is also passing thru it, it is subjected to that pressure.
What I don't know is what that pressure is. I know that according to my gage
and the manual on our transmission the operating pressure is 375-400 PSI,
BUT what I don't know is if the hold tranny case is under that or just the
clutches. I suspect its only the clutch housings because if the whole case
was pressurized oil would be coming out the dip stick hole and the vent.
(Have I answered my own question?)
After thinking about it I believe what happens is that the oil is bleed off
at a pressure relief valve, circulates thru the heat exchanger and returns
to the reservoir in the case. If that's correct then the pressure in the
heat exchanger would not be much because there is no big restriction to
flow.
I don't know what kind of heat exchangers are on the engines/transmissions
here but the one that is on my Detroit/TwinDisc 502 would probably blow up
like a balloon at 600 PSI.
Bill
----- Original Message -----
From: "Bob Clinkenbeard" <>
> I questioned the test pressure of 600psi because it appeared to be to high
> to me. The average auto coolant system relief cap releases coolant to
the
> overflow tank at 14-18 psi, after coolant heating and expansion.
> Do marine coolant systems retain more pressure?
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