Engine oil cooler feed line insert.

[Malcolm Towrie]

I checked the 1942 Canadian carrier we have. First of all, I should say I got it wrong. I assumed the long fitting was solid. I just found it's not, it's hollow, which completely invalidates what I said above in the deleted post.

Anyway, our carrier has the fitting installed in the outer vertical port, as all the drawings show. There is no grub screw installed in the horizontal passage between the two vertical ports as shown by the "straw" photo below.

I have attached a sketch of the fitting. The tubing extension on it is 3/8" OD, which is a fairly snug fit in the vertical passage coming up from the pump. I would guess diametral clearance as about 1/32" based on how much it moves side-to-side in the passage.

So it directs most of the oil from the pump up into the cooler but also allows some flow through the gap between the tube and the passage wall to the crank brgs, etc. Just as well, as if there was no bypass, I think starting the engine with the engine and cooler drained would cause bearing damage by the time the oil got all the way around the circuit.

DSC00120.JPG Engine outlet to Cooler fitting.jpg

Malcolm

[rob love]

On a normal startup, the oil cooler would still have oil in it, even after an oil change. In fact, even after an engine change. On a mk2 with the external oil filter assembly, I would suggest it would be wise for an operator to fill the pump housing with oil before closing up the lid. On my personal modern vehicles, I always do this as well when I change a cannister filter with the exception of those engines where the filter points upwards.

I will be starting an engine soon in a carrier that has had all the lines and cooler replaced or blown clean. In that case, I'll be priming the cooler system with a bucket-pump to prevent the minute or two that the engine would otherwise be running with minimal oil pressure.

[Lynn Eades]

Good advice Rob. I fill most filters that hang vertically as well.
Malcolm. I have a couple of those fittings that have an internal taper cut in the end of the tube. (not sure what for)
Alistair, they appear to be made up as per Malcolm's drawing with a tube pressed in or sweated into the enlarged bore of a standard fitting (same as the short fitting in the other hole) This could be made with a current std. fitting. except that they would sit slightly higher because of the extra length in the spanner hex. I have not seen one like yours, before.
When Andrew Rowe spoke about a threaded plug in the horizontal hole, that is because the Australian (LP2/2a)carrier fittings do not have the long tube. They made it a total through flow system (all the oil must go through the cooler or the bypass valve to get to the engine galleries)