Power steering vane pump shaft bearing

Hi TW. I recently replaced my PS pump with a new OEM unit. After about 100 miles I noticed an intermittent "whistle" on startup, worse when cold, that went away after a few minutes idling or driving. It is definitely not the typical power steering whine.

I popped the hood, and found that I had installed the PS belt with too much tension... Noob mistake, but live and learn. I loosened the belt immediately, and it did help quiet the noise, but it has not gone away completely.

I went ahead and replaced both the PS and AC idler/tensioner pulleys, with the hope that that would cure the noise, but all signs point to having damaged the pump shaft bearing, or some other internal components of the pump.

So to diagnose, I have used the screwdriver stethoscope on the pump (sounds like the source), replaced the idler pulleys (did not fix the problem), and run the truck without the PS belt, which eliminated the whistle.

I found a post here describing how to rebuild the pump, which looks pretty straight forward, but the bearing (90080-36085) has been discontinued.

Does anyone know if there is an alternate part number, or what the specs on the bearing size is for this part to order from a third party?

Other ideas?

Thanks

 

Did you ever find a bearing to work? I'm running in to this same issue right now :/

 

No I have not found anything.

I assume if you tear the pump down and pull measurements from the bearing you can source a replacement bearing that would fit, but I have not done this. It only whistles when it's cold so I have put it off for the summer.

 

Yeah I was wondering about this. Maybe I could take the bearing out of the cheap pump I replaced my OEM one with and put it in the OEM one.

 

If if it is a remanufactured OEM you should have no problem swapping the bearing.

“New” aftermarket, I would not be surprised if the casting and design was different and the bearings were not the same, though. Gotta cut costs somewhere.

 

Update if you do tear them down. I would be really interested in getting the specs on that part to see if a suitable replacement can be sourced from a bearing supply co.

I’ll do the same if/when I get around to it

 

Use Toyota part number 90363-17013.

(For reference: it's a double-sealed 17x40x12 6203-series bearing)

Jeff

 

Thanks for sharing this information. Looks like this is the replacement part for 90080-36084, the original bearing, which has been discontinued.

Thanks for the bearing specs as well!

 

Sure thing!

Wow great info! Thanks!!

 

For what it's worth, only 1995-2001 4-cylinders have a shaft bearing. V6's and 2002-2004 4-cyls don't.

Jeff

 

I had gathered as much from the parts diagrams, but good to have confirmation.

I have an '01 4cyl.

 

Anybody know what options are for rebuilding the pump in an '04? I can't seem to find this information anywhere. Thanks!

 

I have a 2002 Tacoma 2.7L 3RZFE with 5 speed and 4x4 and have been having power steering pump whine. The power steering works normally, except for the whine. I replaced the pump with a rebuilt pump from O'Rielly Auto, which immediately whined. I drove it for two weeks with the whining getting worse when I replaced the pump again. Once again, the whine was back from the first start though it was quiet until in the middle of the bleeding process (about 30 seconds). I expect it'll continue to get worse, like the last pump.

As a side note, after the first O'Rielly pump failure, I ordered a second pump to swap in and was given a filthy box with a pump sitting in a plastic bag from a Mexican grocery store. The pump appeared as though it had been attached to the hoses (dripping PS fluid), but didn't appear marred as though it had been bolted up. I set it into the mounts and found the pump body was about 1/4" narrower than the mounts, so put it bag in it's used bag and returned it. No apology from whatsoever from the clerk for the complete waste of my time/effort. Thanks O'Rielly - how to create a new non-customer!

So, the question I have is what causes the whine? Do I attempt to rebuild the pump with a kit? Is the whine from the seals or the bearing? It's not leaking externally. I'm perplexed and frustrated.

Thanks for your help!

 

Any froth in the reservoir? Trapped air?

I’ve heard mixed reviews about O’Reilly pumps.

 

This thread, https://www.tacomaworld.com/threads/power-steering-pump-rebuild-how-to-with-photos.377002/ will show you how to do it.

Here are links for rebuild kits:
4 Cyl 2.7 3RZ rebuild kit: https://www.toyotapartsdeal.com/oem/toyota~gasket~kit~power~steering~pump~04446-04020.html
6 Cyl 3.4 5VZ rebuild kit:https://www.toyotapartsdeal.com/oem/toyota~gasket~kit~power~steering~pump~04446-04010.html

 

Thank you for the replies and I apologize for my slow response!

That's a good question re: froth/trapped air and I should have addressed it. There was froth during the bleeding process, but it quickly cleared up and runs with no froth in the reservoir. Now that I've run the second O'Rielly pump a few days, it too is getting noticeably louder, like the first pump. Unfortunately, I turned in my original Toyota pump for the core return. I'm thinking I'll give O'Rielly's a third chance and try one more pump.

I'm not sure what's causing the whine noise, whether it's the bearing or seals. There's no external leak. With the bearing being unavailable, I'm not sure it's worth putting a seal kit into a "rebuilt" O'Rielly's pump. I may be better off returning the O'Rielly's pump, getting my core $ back and purchasing a pump elsewhere. If so, what's the best option - biting the bullet and buying a new factory Toyota pump or maybe something from NAPA or Advance Auto?

Thanks for your kind help!

 

It seems really unlikely you'd have three pumps fail in a row. I'd suspect something else in the system at this point. I'd start by ruling dumb things out. I assume it's new fluid? Is it the correct fluid? Could the whine be coming from another one of your pulleys? Sometimes can sound like P/S whine.

Might be a dumb idea, but maybe check the water pump? It's on the same belt. I assume you pulled the belt to change the P/S pump. What if re-tensioning the belt corrected a water pump whine briefly, then things settled in and the noise came back?

 

Currently installed is the second O'Reilly's pump. This pump though with a whine that's getting louder, does sound better than the first. The first replacement would make sporadic rough sounds (for lack of a better description) - it sounded quite sick. It made a whine immediately upon first start-up, where the current pump was quiet for the first 20-30 seconds, then started whining during the bleeding process. I'm using a synthetic Dexron V, if I recall correctly, which I've read is compatible. I'll definitely remove the belt and run it to see how it sounds.

Thank you for your great suggestions! Most appreciated!

 

https://www.toyotapartsdeal.com/oem/toyota~bearing~for~vane~pump~shaft~90080-36084.html

 

2002’s don’t have a bearing.

Jeff