P38A Gearbox oil cooler no return valve?

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Salisbury Nick

Salisbury Nick

Well-Known Member
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Location
Dorchester
Morning all. Do any of you know whether the oil cooler rad has a non return valve built in or any other feature that makes it important to have the flow going in one particular direction? So, for example, when re-attaching the oil hoses does it make any difference which hose is attached to the top or bottom inlet/outlet?
 
Salisbury Nick said:
Morning all. Do any of you know whether the oil cooler rad has a non return valve built in or any other feature that makes it important to have the flow going in one particular direction? So, for example, when re-attaching the oil hoses does it make any difference which hose is attached to the top or bottom inlet/outlet?
Click to expand...

No NRV. Pipe on side and pipe on back fit them where they came from.
 
Salisbury Nick said:
Ah - well that is the problem. I don't know which one came from which one - so does it matter?
Click to expand...
\i wd have thought so yes, the gear cooler is probably set up to optimise cooling from flow in one direction. When I replaced my hoses on my GEMS it seemed pretty hard (i want to say impossible) to get them the wrong way round) the metal pipes running to the cooler will lie parallel if you've got them the right way, and i suspect it won't work the other way round. I can grab a photo of mine if you can't find a stock photo.
 
romanrob said:
\i wd have thought so yes, the gear cooler is probably set up to optimise cooling from flow in one direction. When I replaced my hoses on my GEMS it seemed pretty hard (i want to say impossible) to get them the wrong way round) the metal pipes running to the cooler will lie parallel if you've got them the right way, and i suspect it won't work the other way round. I can grab a photo of mine if you can't find a stock photo.
Click to expand...

Different cooler on GEMS than diesel.
 
So - which of these two options do you think is the inlet hose?

Rad Hoses.jpg


and, which of these is the matching hose?

Cooler Hoses 2.jpg
 
The pipe coming from the bell housing on the gearbox would suggest it comes from the gearbox oil pump?
@Henry_b could know this one.
Didn't some bod say that the flow is reversed for the tc lockup?
Run it and see if there are any faults, just change the pipes back. Mine runs mostly in tc lockup on our roads and does very little town driving but off roads at slow speeds. If that's the case I.e it reverse flow then it shouldn't matter??
Edit edit edit....
 
Mark Piercy said:
The pipe coming from the bell housing on the gearbox would suggest it comes from the gearbox oil pump?
@Henry_b could know this one.
Didn't some bod say that the flow is reversed for the tc lockup?
Run it and see if there are any faults, just change the pipes back. Mine runs mostly in tc lockup on our roads and does very little town driving but off roads at slow speeds. If that's the case I.e it reverse flow then it shouldn't matter??
Edit edit edit....
Click to expand...

The pipes do come straight from the pump.
The ZF locks the converter via a solenoid in the converter apply circuit in the valve body IIRC.

The Leccy controlled 4hp's lock in both 3rd and 4th which is handy..
 
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