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  #1  
Old 08-05-2004, 08:30 PM
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bearings in my oil pump screen...look...







No oil pressure and the fragments were in the pan..the bearings were in the oil pump screen..

Hears the one you asked for Greg...



Where did these come from????

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  #2  
Old 08-05-2004, 08:49 PM
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Those bearings were INSIDE the oil pump screen ?
I have never seen a blow up of a MB oil pump.. do they use roller bearings ?
I don't think a blown vacuum pump could get the bearings INTO the inside of the screen....
So it looks like the bearings in the oil pump gave way..
Don't know how this caused the engine to stop running without doing a lot of damage...
But fixing it is pretty much bolting another oil pump up... and messing with chains of course...
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  #3  
Old 08-05-2004, 09:12 PM
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Relatively sure they're from the vacuum pump, either the current vacuum pump or one that was replaced at some point. If you look carefully at the screen you'll probably see where a ball bearing made it through the screen (which it eventually will) and then you got one in the oil pump which ruined it.

Gilly
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Old 08-06-2004, 05:20 AM
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I also believe those bearings could only have come from the vacuum pump.... but the description of that stuff being inside the screen has stumped me.....
I can see a bearing being pulled through the screen also.... but if that bearing holder was inside the screen.... with no signs in the picture which I can make out of a huge hole.... I am still stumped.... I know of no automotive oil pump made with ball bearings.... bushings are fine for something with ample oil supply and access....
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Old 08-06-2004, 08:43 AM
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Inside to one person might be outside to another....:-)
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  #6  
Old 08-06-2004, 09:32 AM
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I just pulled out the same bearing parts due to a vacuum pump failure. If you haven't replaced it yet You should at least pull it and make sure its still not in the middle of failing. It will continue to add metal to your oil pan and can cause the timing chain to jump or break which will ruin the engine.

Something else to think about if those parts were past the oil pump screen they may be clogging up the works somewhere and have already damaged internal engine parts which can also cause oil pressure loss.

I also can't see how they would get into the internal part of the pump past the screen. I had some parts stuck to the screen bet it had kept them on the oil pan side.

Stephen
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85 300D 305K miles WVO(105K so far), Mine
82 300SD 235K miles BIO-D, Wifes
96 F250 SC PSD 4X4 285K MILES BIO-D, Ours
89 BRONCO 182K MILES sold
Finally Compression Ignition Only!
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  #7  
Old 08-06-2004, 04:01 PM
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I was not clear, The ball bearings were in the bowl of the screen.

So if it wasnt for the rim around the screen, they would have been in the oil pan.
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  #8  
Old 08-06-2004, 08:34 PM
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Is this the critter where talking about

Diesel vacuum pump


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  #9  
Old 08-06-2004, 08:47 PM
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Yep, but there are two ' styles'... and if you order the repair kit you need to know which you have....
Some catalogs show pictures of the two types....
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  #10  
Old 08-06-2004, 09:38 PM
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SO its the repair kit I need, or the whole thing, or both?
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  #11  
Old 08-06-2004, 09:43 PM
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I think you will have to take it apart to determine that...
but you might consider getting one from a junkyard and putting a kit into it...
Yours really exploded....
usually only the diaphram is needed to keep truckin....
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  #12  
Old 08-07-2004, 12:37 AM
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If it came apart and left pieces you will need the whole thing. If you get one from a junk yard and put the kit you still have a used bearing with who knows how many miles on it that could potentially do the same thing your original did.

I oped for the new but they are 350-450 for a new at dealer cost.
I called everyplace I could find for one that was in stock and paid 250. Persistency made me lucky

Stephen
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85 300D 305K miles WVO(105K so far), Mine
82 300SD 235K miles BIO-D, Wifes
96 F250 SC PSD 4X4 285K MILES BIO-D, Ours
89 BRONCO 182K MILES sold
Finally Compression Ignition Only!
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  #13  
Old 08-07-2004, 06:44 AM
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The picture in the other Vacuum Kit rebuild thread at this time shows the bearing along with the other stuff....
So I was suggesting rebuilding a pump which at not exploded... but that way you would have a new bearing.....valves, diaphram....
Attached Thumbnails
bearings in my oil pump screen...look...-piston-vacuum-pump-rebuild-kit.jpg  
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  #14  
Old 08-07-2004, 11:34 AM
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I tried all the usual mail order outlets and made a lot of calls and could not find anyone that had the kit including the bearings etc.

It was also my understanding that if available it was substantially more expensive.

Stephen
__________________
85 300D 305K miles WVO(105K so far), Mine
82 300SD 235K miles BIO-D, Wifes
96 F250 SC PSD 4X4 285K MILES BIO-D, Ours
89 BRONCO 182K MILES sold
Finally Compression Ignition Only!
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  #15  
Old 08-07-2004, 12:34 PM
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Location: Chimacum, WA
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vacuum pump failure

The same thing happened to our former Benz diesel, a '79 240D. The first symptom was a loss of oil pressure at low rpm's. When I removed the oil pump, I found bearings in the oil pump screen along with several shards of metal, probably aluminum. The loss of oil pressure was due to additional material having become lodged in the oil pressure relief valve. When I dismanted the relief valve and removed the remains of the vacuum pump, the problem was solved. Oil pressure returned to normal. However, at the time, the source of the bearings and the metal shards was a mystery.

Some months later, the car lost all vacuum, including the vacuum assist for the brakes, fortunately not at an inopportune moment. When I removed the vacuum pump, I discovered that its lever had broken, the eventual result of the earlier incident which had put the bearings into the pump screen.

This will make more sense to you when you remove your vacuum pump. The autopsy will be the illustration for all this text.

If you're fortunate, your oil pump has not been damaged except for the fouling of the relief valve. However, the vacuum pump is history. I replaced mine with one from a recycler and it worked fine for the remainder of the time I kept the car.


Phil

'84 Euro 300D
'85 300D

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