I rebuilt the vacuum pump on my son's 240D today, Thanks Rich for the link and the tips! The 6" wobble extension on a short ratchet was right on the money!
I have actually done this job before on my wife's 300TD, but was unable to find the plywood jig that I used to bolt the pump to. I decided not to build another, and thought that clamping to a Workmate would cut it. It actually worked very well. I used 26 mm of spacers under the pump, but found that it bowed the diaphragm up too high so that the bolt holes in the diaphragm were up above the flange. I evenly loosened the clamps until there was about a 6 mm space between the pump base and the workmate and the diaphragm laid flat. So for my pump at least, 20 mm would be the correct spacing. Proviso for any who attempt to do the job this way: I attached the clamps myself, but an extra pair of hands would have made it easier! Here is a pic of the pump clamped to the workmate: http://my.opera.com/gfior/albums/showpic.dml?album=762222&picture=10280395 Greg Fiorentino '85 300SD '80 240D 4 spd. manual '79 300DT (with new crate engine) '95 and '97 Crown Vics -----Original Message----- From: mercedes-boun...@okiebenz.com [mailto:mercedes-boun...@okiebenz.com] On Behalf Of Rich Thomas Sent: Wednesday, May 06, 2009 7:14 AM To: Mercedes Discussion List Subject: Re: [MBZ] OM 617 vacuum pump rebuild howto http://www.constructivity.net/rebuilding_the_vacuum_pump.htm If you are just doing the diaphragm you can do that without taking the whole thing off (which is more involved). You need to get the whole area REALLY CLEAN, like spray the whole area down with degreaser then take a brush and high-pressure hose to it and clean all around. Take off the fan and shroud (loosen the belts) (maybe do this before cleaning if you can do it at home, otherwise go to the quarter car wash and spray it all good then take that stuff off back home). Take off the hose fittings, then take off the screws that hold the diaphragm cover on. These are machine screws with slotted heads, 7 or 8, a bit fiddly but with a short bit in some kind of holder like a little ratchet (or power driver), where you can get some torque you can get them all off and then just slide the cover off. One or 2 are hard to see but they are there. The diaphragm is held on now buy the center bolt, an allen screw, with little round metal disks front and back. It helps if you rotate the engine enough so that the diaphragm is flat. Pay attention to how they are together and oriented. The little check valves are in the cover with the 2 acrews, they get goobered if any oil has leaked. You might be able to clean them, or just replace them, pay attention to orientation. Put it back together with the blue loctite on the allen screw that holds the diaphragm on, then button it all up. A magnetic screw bit helps the screws to get in the right places. Clean out the hoses to make sure there is no oil goobering them up. I did this the other day, have to do it again as the diaphragm looked good and I put it back, but is still not sucking, so gotta replace it. The screw was loose so it was not diaphragmming. --R Luther wrote: > Does anyone have a writeup or link to a writeup on rebuilding the > vacuum pumps? TIA all, > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
