Early Oil Pump Question

[Conaway2]

The 1929 Sport Coupe project car I bought several months ago came with a rebuilt engine, which I have been inspecting recently. I don’t know who rebuilt it or when, but suspect it’s a Sears engine from 30 or more years ago, based on the history of the car.

The original block number was ground off the block has been re-stamped. The oil pan is the 1928 style with removable round oil pump access plate on the bottom. The oil pump is also unlike others I’ve seen.

The picture shows two major differences - a cast bottom plate with no spring or clip and two slits at the top of the housing for the oil to exit..the pic shows only one of the slits.

The engine has obviously been rebuilt with all new pistons, rings, valves and springs, and the oil pump has new bushings, gears and main shaft. The engine is spotless inside and has clearly never been run.

My questions are - is this an early 1928 pump ? Should I replace it with a later style pump for better oil flow, or will this one be fine ??

Many thanks - Jim

[ursus]

The early 1928 pump would have a round vane in the casting and not one that is ribbed like the one you have depicted. It would also have a gear shaft that is recessed between the shaft bearings. However, the pump in the photo appears to be from a Model B since it has a rectangle shaped exit port on the one side. I would remove the bottom plate and pull it apart to see if it has the correct recessed shaft (also a feature of the Model B pump as well as having the rectangular exit ports on both sides of the upper part).

[J Franklin]

If you want to know a bunch about the model A find a copy of the Service Bulletins, they have a lot of intersting info.

[Conaway2]

Originally Posted by ursus

The early 1928 pump would have a round vane in the casting and not one that is ribbed like the one you have depicted. It would also have a gear shaft that is recessed between the shaft bearings. However, the pump in the photo appears to be from a Model B since it has a rectangle shaped exit port on the one side. I would remove the bottom plate and pull it apart to see if it has the correct recessed shaft (also a feature of the Model B pump as well as having the rectangular exit ports on both sides of the upper part).

Ursula- thanks very much. The shaft is not recessed - a single diameter the entire length. And both exit ports are rectangular.

Do you know where I can find a pic of a Model B pump ?

Many thanks - Jim

[Conaway2]

Originally Posted by J Franklin

If you want to know a bunch about the model A find a copy of the Service Bulletins, they have a lot of intersting info.

I have the service bulletins, but do not find this particular oil pump mentioned.

Thanks - Jim

[Gary WA]

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this help from v8SB

[Conaway2]

Originally Posted by Gary WA

this help from v8SB

This info is very helpful - many thanks!

Jim

[katy]

Originally Posted by Conaway2

This info is very helpful - many thanks! Jim

Ditto, will keep copies for reference.