Engine oil cooler feed line insert.

[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.

[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)

[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.

[Lynn Eades]

Tony, I assume that the filter assy in the CMP is a bypass filter, not a full flow type? (single centre bolt on lid)
In the carriers there is an unrestricted flow through the cooler and back to the galleries. They are fitted with that type of bypass valve which is supposed to bypass the cooler if the oil is cold and thick.
I am keeping this going because I am not yet 100% sure about how it should be in a full flow situation as opposed to the lesser volumne required for a bypass filter (which probably has a 0.065" restrictor on the line in) It makes more sense to have the cross gallery completely blocked, than have some of the supply head off directly to the rear main.
I guess in the end it just might take one more trip around the circuit before it all goes through (an added full flow) filter.
I have just recently installed my crank and am too late for mods now.

[Tony Wheeler]

Originally Posted by Lynn Eades

Tony, I assume that the filter assy in the CMP is a bypass filter, not a full flow type?

Yes Lynn, standard bypass filter assembly with return pipe to oil pan. That full flow system described in the Ford manual is a complete mystery to me. Stillborn idea perhaps...?

Originally Posted by Lynn Eades

In the carriers there is an unrestricted flow through the cooler and back to the galleries. They are fitted with that type of bypass valve which is supposed to bypass the cooler if the oil is cold and thick.

Yes, it's the same part in the diagram, intended to protect against blocked filter.

Originally Posted by Lynn Eades

I have just recently installed my crank and am too late for mods now.

No mods necessary for full flow filtration, just a kit for the oil pump. Simples!

http://www.flatheadspeedandmachine.c...sion-kits.html