Power steering Pump Question.

[Ccmano]

Originally Posted by A26B

Great job doing all the research to be able to solve this parts "NLA" delimma. Do you have a source & PN for the "complete rebuild kit?

Thanks Hans!

The kit is from “AutoPartsGeek” via EBay, $18.96 Shipped, a US company, Parts are from USA, Mexico and Taiwan.
H





Five sources of ZR1 (90'-95' ZR-1) Power Steering Repair Kits are provided each having 7 parts (one extra "O" ring in each kit over that shown in Kit # 8401401).

Edelmann Power Steering Repair Kit 73198ZF

Gates Power Steering Repair Kit 1819XP

Sunsong Power Steering Repair Kit 8401344

Edlemann Power Steering Repair Kit 8561

Sunsong Power Steering Repair Kit 8401344[/QUOTE]

[Ccmano]

So I replaced the front bearing and seal. Works like a champ! The shaft and bearing are held in from the front with a C-clip. Once the C-clip is removed the shaft and bearing pops out with little effort. This exposes the front seal. The seal is a press fit, some judicious prying and it popped out. The new seal went in with an appropriately sized socket to gently hammer it in. The bearing has to be removed from the shaft with a press. The clearance from the inner race to the shoulder of the shaft has to be measured and noted before disassembly so that the new bearing can be pressed to the same clearance. A half inch drive long socket of the appropriate size to press from the inner race did the trick to press the bearing off. Similarly a socket to support the inner race of the new bearing is used when pressing the shaft on to the bearing, noting the clearance to the shoulder of the shaft. Once together the shaft and bearing pop back in and the C-clip is replace to hold it together. That’s it. The rear seals can be accessed from the other side. Mine wasn’t leaking so I left it alone. Looks like the rebuild is pretty straight forward. I think I’ll be rebuilding these moving forward. They usually just leak or have a bad bearing. BTW the full rebuild process is written up in the FSM under “Unit Repair” of the Power Steering Pump.
H

[jss06c6]

Looks like I'll be adding this to my parts inventory! Thanks Hans!

Sent from my SM-G950U using ZR-1 Net Registry mobile app

[Dynomite]

In -Solutions- Post #5 under Steering..........Power Steering Pump Repair Kit

[klork]

PSC motorsports might be another choice in getting the pumps rebuild. They do high quality pumps for off road and could probably rebuild these pumps.

[jss06c6]

Ordered one for the parts bin yesterday Hans. Thanks!!

Sent from my SM-G950U using ZR-1 Net Registry mobile app

[Roadster]

Hans, question for you. Is there a difference in the different rebuild kits I am listing? It seems like one kit has different part added, or they are just using a specific generic pic that they use!!!
Thanks for any info, Tom

Sunsong 8401401.....the kit you purchased

Edelmann 8561.....another one I found

Sunsong 8401344....another Sunsong that appears to have a different part

[Ccmano]

Good question Tom, There are basically three versions of the same pump used on the C4 line from 84 to 96 corresponding to the 3 engines used. L98, LT1/LT4 and LT5. The differences between the L98 and LT5 are documented in this thread. Not sure how the LT1 version differs.

Looks like between the two Sunsong products one has the bearing and the other does not.
The Edelmann appears to have the bearing as well.

From my observations the internals are all the same with the exception of the vane direction that determines direction of rotation.

H

[Roadster]

Originally Posted by Ccmano

Good question Tom, There are basically three versions of the same pump used on the C4 line from 84 to 96 corresponding to the 3 engines used. L98, LT1/LT4 and LT5. The differences between the L98 and LT5 are documented in this thread. Not sure how the LT1 version differs.

Looks like between the two Sunsong products one has the bearing and the other does not.
The Edelmann appears to have the bearing as well.

From my observations the internals are all the same with the exception of the vane direction that determines direction of rotation.

H

Yes and a great documentation that you did Hans. But if you look again at all 3 kits.....the one you purchased Sunsong 8401401 shows on ebay that it contains 5 parts from the pic shown, while the kit you purchased shows 6 parts.
The Edelmann 8561 shows 7 parts and there is one part that looks different from the part shown in the 8401401 kit that you used.
The Sunsong 8401344 also shows the same 7 parts as the Edelmann 8561 mentioned above, and again there is one part in there that differs from the one in the 8401401 kit.
Not having the schematic handy, I am just curious as why there is a difference in that one part and the 2 latter kits each have 7 parts compared to 6 parts in your kit. And each of the 3 kits listed say the ZR-1 pump is compatible with each kit.
Will have to get the FSM out and check the schematic.
Again, your documentation is great and now I am deciding on whether to go ahead since the entire front cooling system is out of my 94 and just redo the pump as you did. Have to check and see if there are any leaks, at least if I do decide to proceed, there is plenty of room to get it done.

[32ValveGuy]

Thanks Hans, just ordered a repair kit for my spare parts inventory