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  #1  
Old 04-26-2005, 05:42 PM
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Looking for vacuum pump o-rings

Pursuant to the "lesson learned" thread, I'm in need of the small o-rings for the valves on a later (turbo) style 617 vacuum pump. They're apparently very weird proprietary pieces and hydraulics/hose fittings-type places can't get anything equivalent to them (something about the section width being less than the thickness), so used original ones are in order.

If anyone has an old broken "parts" pump laying around, please send me a PM.

Thanks,
Tom
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  #2  
Old 04-26-2005, 06:41 PM
carson356
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orings

i looked around and couldn't find any, but there is a kit available, it is mercedes Number 000-586-17-23 fast lane shows the kit for around $70
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  #3  
Old 04-26-2005, 07:01 PM
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This pump supplies vacuum to your brake booster.

Do you REALLY want to put used O-rings in it?

I had a pump go south on my '79 on the freeway at 70 MPH 3 years ago. You'll need all the weight you can muster to get the car stopped.
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Old 04-26-2005, 07:23 PM
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i drove for 3 weeks without vacuum because my pump failed and i had to wait for payday then order them. its not that hard to stop without power brakes. as for the o-rings,they are reusable.
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Old 04-26-2005, 08:38 PM
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Quote:
Originally Posted by kmaysob
i drove for 3 weeks without vacuum because my pump failed and i had to wait for payday then order them. its not that hard to stop without power brakes. as for the o-rings,they are reusable.
It's one thing when you know you don't have power brakes. It's when you think you have them but don't that things can get interesting.
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Old 04-26-2005, 08:59 PM
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Quote:
Originally Posted by Nate Stanley
I had a pump go south on my '79 on the freeway at 70 MPH 3 years ago. You'll need all the weight you can muster to get the car stopped.

Tell me about it......I had a booster fail......on my '79 300SD.......holy bejeasus is that a bear to stop without it.
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  #7  
Old 04-26-2005, 10:19 PM
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I purchased the above mentioned rebuild kit from fastlane - it included the thin o-rings. My old ones were still pliable so they went back in. I can't imagine a failure of a 'thick' o-ring would result in total loss of brake boost. I had 5-7 inches of vacuum with all three of the thin seals - still more vacuum than when one of the old valves disintegrated ( 0'" vacuum - the plastic remnants and tiny spring were sitting on top of the piston when I took it apart)
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  #8  
Old 04-27-2005, 12:17 AM
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Quote:
Originally Posted by Nate Stanley
This pump supplies vacuum to your brake booster.

Do you REALLY want to put used O-rings in it?

I had a pump go south on my '79 on the freeway at 70 MPH 3 years ago. You'll need all the weight you can muster to get the car stopped.
The reason the pump and hence brakes aren't working properly is because I don't have used o-rings in it. The rebuild kit does not include the proper thickness o-rings, and the pump won't work correctly without the originals. I still have one of the o-rings; it is still soft and pliable, should be good to go a while longer.

Surely someone out there has a dead 617 turbo laying around? I'll even buy the entire pump, if necessary...

Thanks,
Tom
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  #9  
Old 04-27-2005, 09:01 AM
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What is the thickness of your original seals? I saved my old ones, but they were the same thickness as the seals in the o/h kit.
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  #10  
Old 04-27-2005, 09:39 AM
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Quote:
Originally Posted by tangofox007
What is the thickness of your original seals? I saved my old ones, but they were the same thickness as the seals in the o/h kit.
The originals are just shy of 1/8", so about 3mm thick. The current replacement seals are maybe 1mm. Sounds like you got a "good" rebuild kit; might you be interested in selling your old ones?

Thanks,
Tom
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