Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 03-23-2007, 09:54 AM
Registered User
 
Join Date: Sep 2006
Posts: 5
Vacuum Pump Woes - 1980 240D

Hi All,

I am having some unusual issues with vacuum pumps on my 1980 240d. I recently had a pump come appart on me. It looked like the cam follower finally gave out. The connecting rod that drove the vacuum piston actually sheared off. Not the best design seeing that alot of that metal drops right into the engine!

I replaced the pump and cam with used spares I had. This pump worked great for 10 days, but then failed. When I opened the pump up, I was supprised to find that the connecting rod had pulled/pushed its way through the piston. The piston was NOT seized.

This seems like an odd failure to me. What could cause this? Are there different pumps with different stroke lengths? Are the cams that drive the pump different? I did do a quick measurment on the lob height, and they appear to be the same. Could it be an issue with the IP or gear that drives the pump? Is there a specific way the cam is suppoed to mount to the gear? I mount the pump in the only orientation that looks possible - with the pump port at about 1 o'clock.

I did notice that the pistion structures are different. The first pump piston was actually a sandwich structure - Flat steel plate that mated to to aluminum pistion -squuzing the ring setup beween the two. The second pump was just a single piece aluminum piston which had the o-ring and "ring" pulled over it.

The pump is the newer style with a single port. The care is a 4 speed manual. Mileage is somewhere close to 300K.

Any insight would be great!

Bill
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 01:11 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page