M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

PAS pump leak.....

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Old 06-02-2005, 12:55 AM
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ML430, Mini Cooper S and Porsche 911 Twin Turbo
PAS pump leak.....

Noticed a small spot of oil on the garage floor underneath the PAS pump - looked like a resevoir leak at first. So I cleaned off all the oil and then re-checked a couple of days later.
Seems to be coming from the back and bottom of the PAS pump - time for a new pump methinks - unless someone has a better idea ?
Any idea how much parts and labor ? Don't fancy doing this repair myself !
Might get it fixed while the dealer is doing the harmonic balancer swap.

Of course I could just live with it and top up the oil from time to time....
Old 06-02-2005, 01:00 AM
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more than likly it is the o-ring that goes between the resevoir and the pump. Or the resevoir might be cracked. either way i doubt that you need a pump...goodluck
Old 06-02-2005, 01:16 AM
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ML430, Mini Cooper S and Porsche 911 Twin Turbo
I was hoping it was the resevoir as well....

I was all set to get one and switch it out - but it's definately not the resevoir - all nice and dry around the interface (had to use a small mirror to see properly). Oil seepage only starts to appear at the bottom / rear of the pump.

Will double check to be sure though.

As ever thanks for the help / advice :-)
Old 06-02-2005, 01:19 AM
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I have never seen a p/s pump leak...be 100% or it will be an expensive mistake
Old 06-02-2005, 08:15 PM
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C63 / ////AMG
Have had 3 repairs to the PS system in the past 10k miles

1) PS rack assembly replaced (59k)
2) then leak at ps fitting at radiator (65k)
3) then leaky ps hose at (70k)

Thank God for the extended warranty!!

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