- Home
- About Us
- Join/Renew
- Member Benefits
- Member Pages
- Log In
- Help
- Museum Store
If you’ve been following the process of disassembling my ’32 Model 54 the fuel pump has a brazed together arm. The arm number is 65519 which is actually correct for ’32. This arm is stamped and riveted. The pump body is a Stewart-Warner 62600 and it is sound and reusable.
I also have a bad pump body with a good forged arm 63369 which is correct for ’30. I would like to pull the forged arm and put it with the good body. Is there any performance difference between the two arms.
The fuel top is generic AC style and should not affect the decision one way or the other.
Thanks!
Bill
The difference might be how deep into the engine the end of the arm extends.
There are basically two different dimensions: one for the pump bolted directly to the engine block,
and the fuel pump with a phenolic spacer between the pump and the engine block.
The ‘no spacer’ pump’s arm will not ride on the camshaft lobe if it is installed with a spacer.
The ‘With Spacer’ pump’s arm will extend too far into the engine and will break from the cam lobe’s lift.
So: Take a measurement from the gasket surface of the mounting flange of the pumps, to the end of the arm. Push the arm in toward the pump to take up the free-play in the linkage. This is the location of the arm on the base of the cam lobe.. the lobe lift is roughly .250-.300″ I don’t remember right now the exact amount..
The arms are frequently broken when they are swapped without noticing the different depth of the arm into the engine block.
Greg Long
“
Is there a recent post on the engine progress? I don’t see one?
Greg Long.
Both arms in question came out of the same Stewart Warner lower pump casting. From what I can gather in the PAS tech notes the AC type D pumps are the ones that need the spacer when replacing a Stewart-Warner 403 type.
I’m waiting for valves and a head gasket to arrive. Then I can get busy.
The arms are interchangeable within the same castings. So there is no guarantee that a Type A or Type D pump fits or has been modified to fit with or without a spacer. Care must be taken to assure the pump lever is not too short or too long..
I have had several pumps with badly warped mounting flanges or badly warped glass bowl gasket surfaces, that I removed the arm from and installed in a good casting, and not always the same 6screw or 10 screw diaphragm or type of pump.
Greg Long.