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-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-21-2004, 02:21 PM
phidauex's Avatar
BioDiesel Hopeful
 
Join Date: Oct 2004
Location: St. Louis, MO
Posts: 806
84 300TD Suspension Pump replacement

Hi,

Say I were to get a very good deal on a 300TD in great shape (tiny rust, under control, all electronics working (yes, A/C and CC too!), very good maintainence records from the local MB shop, etc). Say that the only thing wrong with it is that the hydraulic pump for the leveling suspension leaks badly. Say the local MB dealership has tried resealing it a few times to no effect.

Say I drove said vehicle 700 miles home, and the fluid ran dry, or severely lost pressure. What would this destroy besides the pump? Will accumulators or struts fail if the fluid leaks out at the pump?

Also, should the pump need replacement, I know I'd be looking at around 630$ for a new one. Is replacing it a job for a moderate DIYer? Or is that sort of hydraulic work best left to the pros?

Finally, given that the pump is leaking, but functional for the moment, how much off full price would be reasonable to ask? 650 for the price of the pump? Or if the pump fails is there a whole host of things that will need to be replaced at the same time?

Thanks for your input. I've been looking for a 300TD for a while now, and this deal has come onto my radar and seems very promising. The guy feels bad that his pump just started leaking after he put it up for sale, but before it sold (of course), and seems willing to deal, I just want to know what I'd be expecting, and what a fair discount would be for dealing with a problem like that.

Peace,
Sam

Reply With Quote
  #2  
Old 10-21-2004, 03:21 PM
R Leo's Avatar
Stella!
 
Join Date: Mar 2003
Location: En te l'eau Rant
Posts: 5,393
I'd certainly ask for a discount of $700-800 based on the price of that pump and some labor. Then, I'd buy the car and somehow get it home...stop and add fluid if you have to, just don't let that pump run dry!!!

Next, confirm that it is infact, hydraulic fluid that is leaking and, that it is leaking from the pump....clean everything on the front of the head and look for where the leak is. I'll be willing to bet you a frosty adult beverage that it is the output hose leaking, where the steel fitting is swaged onto rubber line the near the banjo fitting on the pump and not the pump itsself. FYI-if the engine is running over 2000 RPM, that particular line is under about 1800psi when leveling the car.

If it is the hose, you have some options.
1) Go to the dealer, assume the position and hope for the best. Chances are you will need the 'upgraded' hose and some other expensive trinkets. Sorry, I have no idea what this 'upgraded' thing means because after a week, the wrong parts and no hope of getting anwhere I gave up on the idiots at my local MBZ parts distributor.
2) go to a reputable servicer of hydraulic equipment and have them build you a hose. This should run about $100. They can use your old hose ends to make up adapters that can connect an easily fabricated American hose to your car. WARNING! The output hose has at least 23 metering tubes inside of it. Make sure the hose builder understnads this or he may destroy them when cutting into the hose to retrieve the metric ends. If you go this route, make sure you get the hose made the right length too...there isn't much extra room under that hood for 6" extra of hose. To get the right length, you may need to leave some of the metering tubes out of the new hose but that will not be a problem.

If the pump looks like it is leaking, it may just be the copper sealing washers under the banjo bolt. Easy to replace.

If it's not the copper washers then it may be the sealing ring in the pump housing. If that's the case, review the following pdf material 32-640 Removal and installation of pressure oil pump and 32-645 Replacement of radial sealing ring of pressure oil pump to determine if you have the skills necessary to attempt any further repairs.

Good luck!
__________________
Never a dull moment at Berry Hill Farm.
Reply With Quote
  #3  
Old 10-21-2004, 04:38 PM
phidauex's Avatar
BioDiesel Hopeful
 
Join Date: Oct 2004
Location: St. Louis, MO
Posts: 806
Great! Thanks for the info, thats just what I needed to know. I think I'd be comfortable with the actual pump replacement stuff if I have to do it, and one can hope that its just a hose issue. I think I'm going to get the car, and then deal with this pump thing at home. I've got another vehicle, so despite what my girlfriend thinks, I could use another little project.

Peace,
Sam Ley
Reply With Quote
  #4  
Old 10-21-2004, 05:23 PM
R Leo's Avatar
Stella!
 
Join Date: Mar 2003
Location: En te l'eau Rant
Posts: 5,393
Sam,
Whatever you do, don't let that pump run dry.

__________________
Never a dull moment at Berry Hill Farm.
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 03:10 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page