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  #181  
Old 06-07-2013, 01:12 PM
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Vacuum-Pump Friends!

Would love to get verified Part#s on these bearings, and a known-good source for them. Have you guys acquired these bearings on-line?

SKF site part listings, for example, show at least 6 626 bearing variants, with no clarity as to number of balls in race.

Have we agreed that an 8-ball bearing - vs. 6 - shouldn't matter, as long as quality is high? Or is there some compelling argument - better lubrication? better heat dissipation? - for using the 6-ball variety?

In terms of Physics, I'd be hard-pressed to believe that an 8-ball variety should be any worse in heat dissipation; ie, even more surface area for convection, with plenty of good oil circulation, etc.

If it's a really critical application, please advise! Or are we beating this poor dead horse even deader?!

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'68 Triumph TR 250 - The only car I ever loved more than the Mercedes; who needs electricity, anyway? - Damn, why did I sell it?!
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  #182  
Old 06-07-2013, 01:20 PM
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Ya I need to do mine....
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #183  
Old 06-07-2013, 01:44 PM
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My vacuum pump installed by the previous owner has philips head screws on the cover. Can anybody ID the brand based on that? I can't see any markings on it. I'll probably convert to electric ASAP.

Another one bit the dust on benz world.
http://www.benzworld.org/forums/w124-e-ce-d-td-class/1715147-i-feel-truly-sick-how-bad.html
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  #184  
Old 06-07-2013, 02:36 PM
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Why are the 6 ball bearings so hard to find? Why did our pumps use 6 balls and not 8 balls? I wouldn't take a chance using 8 balls unless you've done your homework. I do believe the theory of what kills vacuum pumps is dirt from vacuum leaks of long duration and not age or number of miles (unless it exceeds design life of the pump, whatever that may be). Makes a lot of sense.
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  #185  
Old 06-07-2013, 02:47 PM
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Any exact part numbers, and a known on-line source?

My car is now 400k+ miles; even though vacuum system has been well-cared for, thinkin' about doing this as preemptive maintenance.
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'83 300 SD
'68 Triumph TR 250 - The only car I ever loved more than the Mercedes; who needs electricity, anyway? - Damn, why did I sell it?!
'59 Jaguar 3.4 'Le Chat Noir' - Damn, why did I sell it?!

It's difficult to make predictions, especially about the future.
- Niels Bohr
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  #186  
Old 06-07-2013, 05:14 PM
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Quote:
Originally Posted by funola View Post
Why are the 6 ball bearings so hard to find? Why did our pumps use 6 balls and not 8 balls? I wouldn't take a chance using 8 balls unless you've done your homework. I do believe the theory of what kills vacuum pumps is dirt from vacuum leaks of long duration and not age or number of miles (unless it exceeds design life of the pump, whatever that may be). Makes a lot of sense.
Dirt from vacuum leaks plus the pump would be working overtime and then oil changes are neglected = a shorter life for your VP and maybe the engine if your not lucky. Good thread, thanks

I didn't have any luck finding the 6 ballers either, They dont say how many.
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Last edited by Stevo; 06-08-2013 at 10:12 AM.
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  #187  
Old 06-08-2013, 04:30 AM
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Quote:
Originally Posted by funola View Post
Why are the 6 ball bearings so hard to find? Why did our pumps use 6 balls and not 8 balls? I wouldn't take a chance using 8 balls unless you've done your homework. I do believe the theory of what kills vacuum pumps is dirt from vacuum leaks of long duration and not age or number of miles (unless it exceeds design life of the pump, whatever that may be). Makes a lot of sense.

Quote:
Originally Posted by DrLou View Post
Any exact part numbers, and a known on-line source?

My car is now 400k+ miles; even though vacuum system has been well-cared for, thinkin' about doing this as preemptive maintenance.
I might be able to find out some information about the benefits of 6 balls or 8 balls but at the end of the day if they are all now 8 ball ball bearing races then there isn't much that you can do about it.

You have to decide which manufacturer you are happy with and order the correct size and try to be happy with your choice - I mean Hitler had to make do with one ball - 'cos the other's in the Albert Hall (apparently).

For the record I've just fitted SKF 626-2Z bearings with a gucci metal shield that I hope won't end up in the timing chain! (I have a sneaky feeling I have seven more balls that Adolf)
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  #188  
Old 06-10-2013, 05:28 PM
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I've attempted to answer some the questions raised in this thread here =>

More than you are likely to ever want to know about OM61X piston vacuum pumps

There's quite a bit of information so I started a new one
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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  #189  
Old 06-10-2013, 09:05 PM
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Skf bearings

Going off the wrapper of the skf bearings I used... Working so far. Seem like nice little bearings. 8 ball with steel cage.

SKF Explorer 626 xj 011j Made in Italy Bar code #s - 316577093622
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1985 190D 2.2 auto--gone
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  #190  
Old 06-17-2013, 03:24 AM
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Found this PDF file on the Pierburg Pumps, about damage due to wear on the Cam Disk.

http://www.ms-motor-service.com/ximages/pg_si_0107_en_web.pdf


Charlie
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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

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  #191  
Old 06-18-2013, 10:32 PM
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Quote:
Originally Posted by charmalu View Post
Found this PDF file on the Pierburg Pumps, about damage due to wear on the Cam Disk.

http://www.ms-motor-service.com/ximages/pg_si_0107_en_web.pdf


Charlie
The sheet supplied with the new Pierburg vacuum-pump I installedon my '84 TD mentioned cam wear. My cam had some visible wear marks but nothing I could catch with my fingernail. So I went with it. Four years and several thousand miles later, the new pump is still hanging in there.

On a slighly different note, there have been some vacuum-pump threads here that included mention of possible alternative vacuum pumps.
Last week, while foraging in the Virginia Beach Pick-N-Pull, I happened to wander over to the GM section. I spotted a belt-driven vacuum pump in an '81 Oldsmobile 98 Regency. The pump was mounted on a 5.0L Oldsmobile gas V8. No idea if these pumps are common or still availible, but I thought I'd mention it if anyone is looking for an alternative-pump research candidate.

Happy Motoring, Mark

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