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Old 11-21-2005, 01:20 PM
Posts: n/a
leaking self levelling pump? reseal parts available

i have seen a few problems with the leaking self leveling pumps, here on the board, and at the shop. and with a new pump over $1000.00 117-230-00-64
it pays to try to fix the original one,

you can buy the seals gasket an o-ring seperate, i suggest you buy 2 of the radial seal (004-997-01-47) they can be tricky to install.

gasket 114-236-00-80
seal 004-997-01-47
o-ring 010-997-43-45

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Old 11-21-2005, 09:05 PM
Senior Member
Join Date: Jun 2001
Location: Northern Calif. (Fairfield Area)
Posts: 2,225
I've dealt with these pumps, and it is commendable that you have supplied part #s. I am assuming the gasket is for the mating surface, the o ring is for the pump split, and the seal is the lip seal that keeps the engine oil out of the leveling system. The only thing I could add is to remind owners not to let the pump run out of hydraulic fluid, because the pump will be destroyed.

Auto Zentral Ltd.
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Old 11-22-2005, 12:03 PM
Registered User
Join Date: Jan 2003
Posts: 259
looks like you have some experience in resealing the pump. I have done mine a 91 560SEL few days ago, but the problem that I cannot resolve is the leak from the front seal. It is an o-ring that seals the front. I have redone it twice, but no luck. Fluid keeps on seeping out. I followed the torque specs - 9 Nm for the 2 hex screws for the bearing cap, and 11Nm for the 4 hex screws to mount the pump onto the engine. The sealing ring located at the back of the pump for the cam, is ok after replacement.

Any tricks that you can share? Other posts that I have read says that it is very difficult or impossible to solve a leak from the the front seal....

I have seen used pumps for $150. This is my next plan....

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Old 11-22-2005, 09:03 PM
Registered User
Join Date: Sep 2003
Location: Rio Rancho, NM. USA
Posts: 229
If anyone reading this thread needs a combo pump for a W140 model ('92 in particular) then PM me....I have one in perfect shape for a fraction of a new one.
1996 SL320 97K miles
1996 C220 130k miles
1992 500SEL 170k miles <---sold
1986 300E 216k miles <---sold
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Old 11-23-2005, 04:37 PM
Registered User
Join Date: Jul 2000
Posts: 638
leak at front cover of suspension pump

It is quite possible the front cover is 'warped' a bit and not evenly compressing the O-ring. Try checking the flatness with a sheet of glass just barely wet with oil-seeing if theoil film is transferred uniformly to the (dry) pump cover. It it is not, you can 'flatten' the cover by using a sheet of 240-400 grit Silicon carbide abrasive paper on a sheet of glass,using light oil (WD-40) as a grinding lubricant. Rub the cover back and forth in a straight line, stopping and rotating it 90 degrees every few strokes to ensure even metal removal. Recheck flatness , repeat until it is flat.

You can also put a few layers of teflon tape under the 'O-ring' to increase the compression placed on it. Remember to seal the bolt threads.
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Old 11-23-2005, 05:31 PM
Registered User
Join Date: Jan 2003
Posts: 259
thx for the inputs. the warpage issue is a good one. it does makes sense, and I will try that. On the sealing of bolt threads, what sealant do you have in mind. I cannot figure out how the threads would contribute to the leak as the bolts are way outside of the o-ring area...

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