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#1
11-30-2004, 02:03 PM
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vacuum pump rebuild question
Hey,
I should be getting my rebuild kit on Friday. I was reading the directions and was wondering about this: Quote:
Also since I have an '84 I should have the newer design, what problem may I find with this? And last what book is he talking about? I have a Chilton and a Haynes and neither one tells how to repair them. Actually they both suck but that's another story. Thanks Danny 
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#2
11-30-2004, 05:25 PM
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If you open up that top and you have a big or little split in the rubber diaphram then you have the option of just putting it back with a good one...
if your if that is not your problem then you will need to deal with the rest of the stuff... Mine was fixed in my 1980 240 by just putting in the diaphram... Did you do a search ? There is a LOT of good info about this.... and I know I have posted pictures of mine being fixed....
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#3
11-30-2004, 10:42 PM
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Since I just got finished with this job on my 240D, I will shed some light on this subject. The pumps used to be diaphram pumps, but they were changed in 1981 or 1982 to a piston design. So you should have the piston design. The rebuild kit will include o-rings that fit onto the piston and act as the seal (piston ring). In order to change the piston o-rings you have to unbolt the piston rod from the piston. The piston is little more than a flat plate bent on the sides to accept the o-rings. The instructions talk about a new design piston that has a longer skirt or something, which is an inconsequential detail when doing the rebuild. My piston came out easily after I unbolted the rod, which protrudes through the piston. The wooden plate that the instructions recommend is well worth the minimal effort required to fabricate it. It helps both in the safe disassembly of the pump and in reassembly.
...and also the book being referred to is obviously the factory shop manual, which I do not have. The Haynes manual does not help in this repair. Good luck!
__________________
1976 240D 1987 560SL 2007 E320 Bluetec 1998 C280 (now son’s car) 1982 240D Manual - Sold
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#4
12-01-2004, 12:48 AM
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How much did your kit cost? Is it a simple procedure in putting it together?
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#5
12-01-2004, 09:37 AM
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Rebuild kits for the piston type pump are $72 on Fast Lane. Performance Products (and probably many others) also sell these kits. The diaphram rebuild kits go for about half of the price of the piston kits.
__________________
1976 240D 1987 560SL 2007 E320 Bluetec 1998 C280 (now son’s car) 1982 240D Manual - Sold
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#6
12-01-2004, 01:03 PM
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Since you have an 84 you will have the new piston type vacuum pump.
Look at this link for a detailed description of the rebuild. To remove the piston it is synply a matter of removing a nut and pushing out the piston. You remove the piston to replace the skirt ring. http://business.baylor.edu/Richard_Easley//autofaqs/Vacuum%20Pump/Rebuild_vac_pump.htm Dave
__________________
1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car
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