My 1980 300D (175 kmiles) has developed a messy oil leak from the air cleaner. The oil appears to be coming into the air cleaner from the plastic pipe that goes from the air cleaner to the vacuum pump. Would a vacuum pump rebuild fix this?

The link to the vacuum pump rebuild instructions at
http://diymbrepair.com/easley/Rebuild_vac_pump.htm is dead. Anyone know where these instructions can be found?

I've also found references on the forum to rebuild instructions in the shop manual but I've been unable to find such instructions on my CD version of the manual. Anyone know which section of the manual where these instructions are to be found?

Thanks for any help.

Regards

Ian

It is very likely that the 1980 cars used the vac pump with the diaphram. If the diaphram is ripped, oil can move from the crankcase to the air cleaner as you have seen. Can't help on the instructional side, except to say there might be something in the DIY links section on the Shopforum home page.

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1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150

I have rebuilt our vacuum pump and posted the job under the thread Vacuum Pump Repair. It is a little long so I didn't repeat it here but if you are interested you will find it with a search by thread name. I don't go into detail about the actual rebuild of the pump but once you dig into it it is pretty straight forward. If you do the rebuild, as you take the pump apart take care to note how each part is situated, order of washers, etc., and the position of the valves and diaphragm. They all have to be correctly installed. The rebuild is not a difficult job.

Jim W.

I believe 1980 is the "transition year" The older style (which you proly have) is easier to rebuild, but the point is , you need to make sure which you have before ordering the rebuild kit. Also make sure you get new check valves in what ever kit you need.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

A most useful piece of information for ordering parts is the VIN number followed by the engine number. Also a call to the MB Classic Center in California can be very useful. They will furnish a part number, expected retail cost and availability, they do not sell parts but are a great resource.

Jim W.

I seem to have the same problem. If this is the case does it mean the vacuum pump will show decreased vacuum? I checked and mine has 18" when I check it. Is this right?

Thanks

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1980 300d on veggie

If there are two hoses coming out of the pump, it is the "old" style.

Try these nos.: rebuild kit - 000 586 40 43
diaphragm - 001 586 07 43
gasket - 616 011 03 80

If you're planning on removing the pump to do the rebuild, make sure to get the gasket. Also, it is pretty helpful to pressure wash the pump and the surrounding area before you get started.

Good luck!
Jay.

P.S. Check your brake master cylinder for leakage, as brake fluid will eat the diaphragm in the vac. pump.

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On the road, currently:
'83 300D (German spec.) 168k mi. - - Wolfgang (tucked snugly away for the winter!)
'87 300D 375k mi. - finally went over to "The Dark Side"
'87 300TD 225k mi.
Cannondale 66cm CAAD5 w/Campy/Jamis Aurora
Hujsak Custom Fixie/Landshark Track Shark Custom/Ahearne Custom 29'er

Thanks to all who responded to my message. I have ordered the parts listed in babyjames' response.

To cconbalsam, I have plenty of vacuum. In fact, this whole thing started when I refurbished the climate control system to fix leaky actuators and 1-way valves, which increased the vacuum (reduced the pressure) in the vacuum system.

As a can't find any instructions on how to do the job, is it a good idea to remove the vacuum pump from the engine and then rebuild it, or try to rebuild it in situ? Either way, do I have to remove the radiator and/or fan? Unfortunately, the link in the DIY section of the Shopforum home page is the dead one I mentioned in my original posting.

Ian

Both times I've done the rebuild, I've taken the pump off the engine. The only thing I removed was the power-steering pump. On a sedan, you may not even have to do that. Just get a ball-end 5mm allen. You can put a 5mm socket with an extension in it on the short "arm" of the allen to break the bolts loose. Or cut the ball end off (leave it long) and JB Weld it into a socket....

Jay.

__________________
On the road, currently:
'83 300D (German spec.) 168k mi. - - Wolfgang (tucked snugly away for the winter!)
'87 300D 375k mi. - finally went over to "The Dark Side"
'87 300TD 225k mi.
Cannondale 66cm CAAD5 w/Campy/Jamis Aurora
Hujsak Custom Fixie/Landshark Track Shark Custom/Ahearne Custom 29'er

The old style can be rebuilt on the engine, new style must be removed.



http://www.peachparts.com/shopforum/diesel-discussion/164453-vacuum-pump-diaphragm-replacement-pix.html#post1274977

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Sonny


86 190D N/A 2.5L Auto 265k "Ruby" -Sold-
79 300D 242k "Condi" my first -sold- RIP
2013 chevy sonic hatchback - had to for work

I rebuilt the vacuum pump on the 300D over the weekend.

I took the conservative approach and removed the vacuum pump (old style) from the car before rebuilding it. To do this, I removed the power steering pump belt and the radiator.

Rebuilding the pump was fairly straightforward. I built a simple wooden jig to compress the springs inside the pump so that I could make the plunger project into diaphragm space far enough to attach the new diaphragm to it. My left arm was not strong enough to do this. However, I was glad I built the jig because it held everything nicely in place while I checked for proper alignment, etc. I also installed new one-way valves.

Reinstalling the rebuilt pump in the car was straightforward thanks to Jim W's pictures that showed the correct angular orientation, as was reinstalling the radiator.

I've driven the car several tens of miles since the rebuild and the air cleaner and my garage floor remain free of oil for the first time since I bought the car over 2.5 years ago.

Thanks to all who gave advice.

Regards

Ian

1980 300D
1985 524td
+ various gasoline-powered vehicles

Good for you! It is satifying to have success at the repairs we can do ourselves. Good luck with the car.

Jim W.