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Old 03-23-2005, 04:36 PM
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MII power rack seal leaking...

I don't know if it is because the thing sat on a shelf for 3 years, or the fact that I am using a G.M. pump, or a combination of the two, but with less than 100 miles on my project the driver's side seal is leaking. I am using the Heidt adjustable power steering valve which I set 'in the middle'. I checked with my NAPA dealer and they have a seal kit. I don't want to do any kind of an exchange so I am, of course, left with fixing this one. Never having worked on one before I need to know if (1) Can I replace the seals myself (2) does it require any special tools?
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Old 03-23-2005, 05:30 PM
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That pump is too much for that gear so if the seals were weak to start with (likely), the pump over-pressured and failed them. Be sure to install one of those $35 pressure reducing valves specifically made for the GM pump when used on an MII. That gear is pretty easy to rebuild. I have done many of them. The kit comes with all the lip seals, gaskets and O-rings to totally refurbish the gear and a pretty self explanatory exploded diagram. The only special tool required is a seal puller for the passenger side inner seal since it is buried in that pipe. Pretty easy to make your own puller. I'll try to remember to take a picture tonight of the one I made. Also need to take care when setting that same seal 'cause it is buried in the tube and you use a long 1/2" extension, you are doing it blind and it is easy to mis-set it. I have missed on a couple and that accordion boot can get REALLY BIG when filled with pressured steering fluid. No big deal, just take it down and set the seal.
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Old 03-23-2005, 05:55 PM
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Quote:
Originally Posted by willys36@aol.com
That pump is too much for that gear so if the seals were weak to start with (likely), the pump over-pressured and failed them. Be sure to install one of those $35 pressure reducing valves specifically made for the GM pump when used on an MII.
Willys, thanks for the quick response.
Not sure, though, why you recommend that valve since, as I stated, I am using the Heidt adjustable one??? And thanks for the heads-up on the pass. side seal puller.
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Old 03-23-2005, 07:44 PM
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See this.
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Old 04-04-2005, 10:52 PM
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Willys,

Thanks again for the info. In the event, I only needed it to take the thing apart. As you can see, the shaft was terribly corroded. Obviously, that's the reason for the leakage. Took the seal kit (about 50 bucks) back to the parts store and just got a rebuilt rack (about 100 bucks).
While I am a bit of a cynic on low margin rebuilt parts I kinda doubt they would have thrown that thing together looking like that, which leaves 'sitting around 3 years' as the only other culprit. Still, I just don't know how that much moisture could have gotten down there like that.

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Old 04-04-2005, 10:58 PM
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Whoa! That thing is rough!! Obviously sat w/o P/S fluid in it for quite a while. Hope you didn't get any rust contamination in the rest of the system. When you get the chance, rebuild one. It is worth the experience.
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