MValentine

Ive encountered what looks to be a leaking power steering pump on my 2000 LS400. Ive read the tutorial on replacing the o-rings inside the pump itself. And Im planning on ordering those o-rings soon. Im also going to be replacing my drive belt and drive belt tensioner since getting to the pump involves removing the belt anyways. Im going to jack up my car tomorrow, and inspect the leak more up close to determine where its coming from. So now my question is should I just replace the o-rings or is there a power steering pump kit I can get from sewell instead? Im also a tad bit confused on replacing the power steering fluid, it can be any dextron-iii atf fluid correct? or does lexus carry a oem toyota dextron-iii i can just purchase instead? And lastly, would it be recommended to replace any of the hoses?

My list consists of the following parts:
- Vane pump oil reservoir o-ring. part#90301-11016
- Vane pump bracket rear o-ring. part#90301-53007
- Follow control spring seat o-ring. part#90301-18013
- Drive belt. part#99366-H2230
- Drive Tensioner. part#16620-0W101

fixmiester

I have been putting off doing the same thing to my '99, but the Lucas oil I put in a year ago has slowed the leak down to almost nothing, but I know that's not a real fix. From what I've heard, unless the pump is showing other problems, just replace the large rear o-ring, and the external reservoir tube while you have it out, and replace the idle control valve with a plug--whether it's leaking, or not. Dextron III is good.

LScowboyLS

the hoses, especially the high pressure fat sections, are also leak prone

MValentine

So im going to be order all those parts listed above, along with;

- Oil Reservoir to Pump Hose No. 1. Part#44348-50010

Would that be the correct hose to replace? and also in regards to plugging the ACV. I wanted to use the remedy that was posted in the sticky for the UCF20. But I dont have mig welder to fab the ACV. Where did you guys get the oil plug bolt that fits? Also I called my local toyota dealer to see if they had any dexron iii fluid. but they said that they havent carried dexron iii in quite a while. and they only have dexron iv. I rather use toyota fluid than anything else though.

LScowboyLS

you can use the Castrol or Pennzoil version of Dexron III

the correct high pressure hose is p/n 44410-50060 and it is a bit pricey!
$ 339.35 at Lexus of South Atlanta

there is a good aftermarket hose from Omega, it is a 2 piece set, part numbers 75037 and 5209

or another great idea suggested by PureDrifter is to go to your local small airport and find the airplane hose rebuilder (usually within a mile of the airport) and have them rebuild your high pressure hose

PureDrifter

iTrader: (10)

should be closer than that, a lot of industrial applications use hydraulic hoses so any standard hose rebuilder can do it.

Legender

Yes, any hydraulics repair shop can rebuild the high pressure hose for less than $80, at least that's what it cost to rebuild the hose on the '95.... good luck with the rebuild.

fixmiester

Unless you have evidence that the pressure hose is leaking, why would you replace it; you never said that you had identified the leak source for sure. I recommended you replace the reservoir hose, because they do fail/leak once they are disturbed.
Your question was about how to plug the threaded hole that the IAC valve screws into, right? Search for solutions on finding a plug; as I recall, the threads are a little odd, but I believe they are a metric pipe thread (tapered to seal). NAPA or an auto tubing repair place should be able to come up with a plug. In fact, I think PD posted that he had found one awhile back.

LScowboyLS

well one reason would be because they are the single most likely item to fail, and being proactive while you are in there is just smart. And on some LS400 generations, like my '96, the pressure hose is the leak in most cases. (or at least the bulk of it)

an analogy would be your car's A/C system, also high pressure through a pair of 15+ year-old rubber hoses, and by far the most common point of leakage.

python

iTrader: (4)

i make hydraulic hoses on a daily basis and the ps system can spike to well over 1000 lbs per square inch...be careful of what hose is being used as well as the crimping and fittings

python

iTrader: (4)

Btw cowboy is correct...also,whenu replace/remove a component u introduce contaminants so the system needs to be flushed and u also add/replace an inline filter if u so desire. i have a turkey baster and replace the fluid in the reservoir a few times a year so its always clean