Engine oil cooler feed line insert.

[Jordan Baker]

Previous thread. Hopefully it clears up some of your questions.

http://www.mapleleafup.net/forums/sh...ad.php?t=20460

[ajmac]

Thanks Jordan, I even contributed to that and had forgotten all about it! I would still like to get an image of the fitting I have in a parts book! I'm working on a flathead for a friends carrier which needs converting to carrier spec. The cooler return hole has already been drilled but I have to decide if I plug the gallery in the block or turn a new long fitting instead to give me the same result.

[Malcolm Towrie]

Deleted due to being wrong.

[Jordan Baker]

Here is another small thread on these parts

http://www.mapleleafup.net/forums/sh...ad.php?t=13429

[ajmac]

That fitting is only waisted as on the V8 it came from there was no cooler return drilled into the block so the horizontal port was used to return the cooled oil into the gallery. All you are doing is preventing the oil going into the main gallery, the long fitting simply does the same job as the grub screw, the one that I'll make will not be waisted as the block already has the cooler return drilled into the main gallery (first post photo). In a UC the horizontal port to the outside world is plugged by design.

Those were the photos I was looking for! Thanks for the second link Jordan.

[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.

[Tony Wheeler]

Originally Posted by ajmac

That fitting is only waisted as on the V8 it came from there was no cooler return drilled into the block so the horizontal port was used to return the cooled oil into the gallery.

Now that's what I call OPTIMISTIC! Hoping that massively obstructed horizontal passage can pass enough oil to keep the bearings wet, and praying that no tiny morsel of gunk arrives to block it off completely!

waisted outlet fitting.jpg

I think it's reasonable to assume those tiny red apertures are not intended to flow oil, but merely transmit oil pressure to the port, so that a sensor can be fitted if required (sender switch or capillary pipe). For example British T16 PRV mod discussed a while back:

T16 British mod PRV for oil cooler.jpg

Obviously the only safe route for "full flow" oil cooler return is via the third port found on military spec flatheads (or drilled by hot rodders). Oddly enough the Ford CMP manual depicts "full flow" filtration achieved by means of a waisted bushing. This system has never been found on any vehicle, but the diagram serves to demonstrate the potential application for hot rodders. Hence the screw-in waisted fitting may be an aftermarket product for conversion to "full flow" filtration, without having to drill and tap for a grub screw. As you say Alistair: "the long fitting simply does the same job as the grub screw".

img146 - Copy.jpg img146 - Copy (2) - Copy.jpg

[ajmac]

Many thanks to all for the discussion and informative photos / drawings.