Which Oil Pump Do I Have?

[BlueR32]

Mystery solved. Old pump it is. Thanks to all who chimed in on this. Will order appropriate cable (and a new seal)

[m in sc]

how can you tell the diff between new and old style? tooth count only or?

[BlueR32]

Process of deduction I guess based on my engine number and what Arrow said:
" Thats a 5 turn shaft. Meshes with a 40 tooth pump gear, RD250A."

[Arrow]

I stated it was the older pump before we saw the shaft.
The brass nozzles were the big clue. The B model had steel outlet nozzles.

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[m in sc]

i know, just wasn't sure what visual cue you used to identify it, that makes sense.  Now I know, thanks. 

[soonerbillz]

So some Rd250-350 pumps can be used in YD7 & R5 motors?
  As long as they are the "early" version?

[m in sc]

you can use ds7 pumps in rd250 motors as long as the ds7 drive shaft with worm gear is used, and vice versa. same with rd350/r5. pump and shaft should match. This ive actually done before.

I have a hybrid RZ/R5 pump on my 70 r5, uses an RZ housing with R5 internal gear... rz lower shaft, and an r5 top cover, plunger shaft and pulley.  theres options. I would NOT recommend tearing into oil pumps if you don't like small tiny parts and are super confident in your mechanical abilities.   

[Arrow]

Yes, I've swapped lots of pumps around when necessary. On the change over from early to later pumps, there is the issue whether to use a thrust washer on the end of the wormshaft, or not.

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[soonerbillz]

So here are 2 "old" style pumps.
The one on the left out of a yd7 the one on the right from a r5.
Why is the inlet port clocked different between the two?

[SoCal250]

I think I found the answer. The Tech Bulletin in the library appears to be missing Page 1.

Thnks for pointing that out. I have fixed the files in the Tech Library to include 2 pages. Both PDF and JPEG are now posted there

[Arrow]

So here are 2 "old" style pumps.
The one on the left out of a yd7 the one on the right from a r5.
Why is the inlet port clocked different between the two?

I don't know why the need for the (earlier) inlet nozzle position. Also the brass nozzles could be different here. The early one had a smaller diameter where it fits in the casting, and the valve seat is direct in the Aluminium, with no rubber valve insert.

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