Power steering pump 20,000 series+ / GM interchange number - Rolls-Royce and Bentley Forums
 
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post #1 of 10 (permalink) Old 11-13-2019, 09:23 AM Thread Starter
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Power steering pump 20,000 series+ / GM interchange number

In short, does anyone have the GM part number for the Power Steering pump in 1988 and newer SZ cars? or know which GM car uses said pump?

In long:
Does anyone know which GM car the power steering pump came from, on the 1988 and newer SZ cars? This is a GM remote reservoir pump, but it doesn't match the majority of GM cars that used a remote reservoir pump. There is a different orientation on the RR version, which I am sure GM must have used on some of their cars but I can't figure out which.

I am afraid a family member on a long trip needs a new pump, they seem to have run it dry, and I'd rather not pay the extra $400 for the bentley box. Any help greatly appreciated.

Use your PMC for mental therapy. I replaced my psychiatrist with a PMC. Thirty minutes of driving per day is more effective than doctors and drugs.
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post #2 of 10 (permalink) Old 11-13-2019, 09:28 AM
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post #3 of 10 (permalink) Old 11-13-2019, 10:09 AM
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Sorry got wrong year so deleted what I wrote

Last edited by Steve E; 11-13-2019 at 10:19 AM.
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post #4 of 10 (permalink) Old 11-13-2019, 10:20 AM Thread Starter
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7846075 is a casting number on the pump body. This helps. But many cars, jag, volvo, isuzu all use this pump body casting and some may have diffferent inlets and outlets, or maybe different valves inside them to regulate assist, (I haven't taken one apart I don't know what is inside them besides a vane pump)

Use your PMC for mental therapy. I replaced my psychiatrist with a PMC. Thirty minutes of driving per day is more effective than doctors and drugs.
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post #5 of 10 (permalink) Old 11-13-2019, 10:30 AM Thread Starter
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19318799 is the acdelco part number for the jaguar xj6 pump which looks similar but has the return going the opposite direction.

Use your PMC for mental therapy. I replaced my psychiatrist with a PMC. Thirty minutes of driving per day is more effective than doctors and drugs.

Last edited by spiritofx; 11-13-2019 at 10:36 AM.
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post #6 of 10 (permalink) Old 11-13-2019, 12:00 PM Thread Starter
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I also found out that amongst other cars, a similar pump to the Jaguar pump is used in dozens of GM cars. the difference between this one and the jaguar one is that the nose of the casting is not machined down like on the jaguar pump. It isn't machined down on the RR pump either, so thats no loss to us.

if we were really poor, and we were willing to get a longer return hose to fit it, we could put a 1982 chevy camaro power steering pump in a 20,000 series spur in place of ue72303. The only visible difference is the location of the return hose barb on the pump itself. If we were to use this camaro(and buick skyhawk and oldsmobile firenza et al) pump, we would be faced with the situation that the return hose (which is the hose from the reservoir to the pump itself) will have to go under the pump and loop back upwards to meet the hose barb on the pump. If one could find a return hose with a 90 degree bend on one end, this would make the situation better, and I doubt most folks would ever know you got a pump for $40 instead of $400.

I hope to find an exact match but all I can find is the one for the volvo v40 diesel which isn't in the USA. but for UK folks, I think that is a direct bolt in, with all the pipes in the right place, but this time, the hose barb has a 90 degree bend in it, pointing rearward in the car, which should pose no problem although will need a longer hose from reservoir to pump.

Use your PMC for mental therapy. I replaced my psychiatrist with a PMC. Thirty minutes of driving per day is more effective than doctors and drugs.

Last edited by spiritofx; 11-13-2019 at 12:07 PM.
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post #7 of 10 (permalink) Old 11-13-2019, 12:20 PM Thread Starter
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If you were using the {1992 jaguar xj6} pump or the {1982 camaro 2.5L 4 cyl.} pump, you would have to check clearance on that bottom hose attachment, as it is close to the tightening bolt for tightening the belt. I think it will fit. If not, tighten the belt with the hose off, then remove the tightening bolt after you tightened the main mounting bolts, and put the hose on. Now we would be in the realm of vandalism, but if you save the parts you remove, nothing is too badly lost.

keep in mind too that everything I have said here are educated guesses, the education for which consists of 40 years of puttering about with other projects, and 2 hours of googling this situation.

It seems I have some relatives on a 2000 mile journey who have somehow run their pump dry. I don't know how they did it, but I am trying to find a way for the pump to not be in a Bentley box. search continues but gets less promising as it goes. the thing is, this pump casting has a feature that allows the return to be machined in either of two ends, and I just need to find the car that shares the part with the RR. If i find an actual proper answer maybe I will ask the moderator to put it in the first bit of the thread.

Use your PMC for mental therapy. I replaced my psychiatrist with a PMC. Thirty minutes of driving per day is more effective than doctors and drugs.
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post #8 of 10 (permalink) Old 11-13-2019, 02:40 PM Thread Starter
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Now I am finding that they make these pumps with different shaft diameters.

If anyone knows the shaft diameter it would help

I found gm part number 19318807 looks identical in all aspects to the spur pump, but it is for tiny cars and I don't know if it has enough pressure or enough flow rate. Plus the shaft diameters, I have no idea what the SZ car takes. I can't put a caliper on it because it is my family far away who broke their car. They made 19mm shafts and 17mm shafts, and may have made non metric dimension shafts too.

If you were using the {1992 jaguar xj6} pump or the {1982 camaro 2.5L 4 cyl.} pump, you would have to check clearance on that bottom hose attachment, as it is close to the tightening bolt for tightening the belt. I think it will fit. If not, tighten the belt with the hose off, then remove the tightening bolt after you tightened the main mounting bolts, and put the hose on. Now we would be in the realm of vandalism, but if you save the parts you remove, nothing is too badly lost.

keep in mind too that everything I have said here are educated guesses, the education for which consists of 40 years of puttering about with other projects, and 2 hours of googling this situation.

Use your PMC for mental therapy. I replaced my psychiatrist with a PMC. Thirty minutes of driving per day is more effective than doctors and drugs.
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post #9 of 10 (permalink) Old 11-20-2019, 10:51 AM Thread Starter
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Final Answer:

The part numbers:

$73.00 Napa Auto Parts: Part #: PS 385236

$47.00 BBB Industries 7350110; also part number 6337
$47.00 Vision/OE 7350110; also part number 6337
$76.99 Master Pro power steering 735-0110

Well I have concluded my research and found what appears to be a proper match to the 20,000 series SZ car pump! It is available from many sources under different part numbers depending on the brand. Some numbers listed above.

If your store doesn't have those brands, simply ask for a pump for a 1983 Buick Regal 4.3L v-6 Diesel. Also offer the part numbers, as often they have interchange part numbers in their computer.

This gets you a pump Identical to the Spur unit with same casting number on the case, same input and output locations and sizes. The pump is used on several large cars and trucks with large tyres, so it should have the required pressure and flow rate to power the steering in the Spur.

This saves $400-$800 off the price of a "RR" part, which has always been a GM part anyhow, and is very likely exactly the same unit. While I have not bought one yet to put a caliper on the shaft diameter to measure it, it does look correct. I figured out through research that the shaft diameters on these GM Saginaw type 2 of pumps are all metric. Either 17mm or 19mm. That is pretty easy to tell by looking at the photo. Photos of units with the fatter 19mm shaft look quite different than the 17mm.

This pump is the best match I can find and is superior to others mentioned above which are either for smaller cars or have the return port in a different orientation.


This pump was also used in some 1980s Jeep Wagoneer and Commanche models.

Beware that rockauto site also lists a couple of Lares branded pumps but the photos show the wrong style pump, those are the older type with the reservoir attached, which won't fit a 20k series RR. Always make sure the photo of whatever pump you get shows the (small GM type ii) pump without the reservoir.


Cheers everyone. Maybe an update could be made to put this last post first, so folks don't need to read all the prior posts. I had put them up hoping someone else would have the answer, so I could send a pump to my family who busted theirs on a road trip.

Similar amounts of money can be saved by purchasing an a/c compressor directly from the Sanden website. Sanden made the compressor for the SZ, and most parts sellers don't sell genuine Sanden units, but rather, Chinese copies, which don't last long and spew metal shavings into your whole system.

Sanden don't make the model 510 anymore, but they make a later 7 piston model which is what RR specify. The Sanden numbers are
Type: Sd 709
Model Number 7641

That's $249 direct from Sanden website.

For enhanced cooling, Sanden make a special unit with 15% more capacity, which I recommend especially if using 134a refrigerant. The enhanced model is $319 from Sanden direct, part number 4616.

RR specialists and parts stores alike will sell you chinese copy with their house brand on it. I didn't have this info and bought a compressor from Albers for $550, which was their cheapest reproduction unit they get from Introcar. I couldn't stomach the $1200 price for the genuine unit from Albers which is a real Sanden unit in a stylish Bentley box. The repro unit that I got, I could have bought for about $149 if I had known the part number. I will end up doing that job over again with the genuine unit direct from Sanden. Maybe I will make a new thread with the Sanden info.

Use your PMC for mental therapy. I replaced my psychiatrist with a PMC. Thirty minutes of driving per day is more effective than doctors and drugs.
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post #10 of 10 (permalink) Old 11-20-2019, 02:16 PM
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Thanks for taking the time to do that research! And post it here too.

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