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 > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 09-24-2017, 01:14 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,794
Clean coolant, rusty pump impeller

A few weeks ago I changed the wagon thermostat and flushed out the green coolant from the PO's tenure. I noticed some play in the water pump pulley and slow coolant loss so I replaced the water pump yesterday. The green coolant was clean and the weeks old G-05 was also clean. The revealed block and pump coolant passages were immaculate. The pump impeller however was rusty. The old pump has OE/dealer replcement markings. What should I make of this rust?

Sixto
98 E320s sedan and wagon

Reply With Quote
  #2  
Old 09-24-2017, 02:06 PM
Mike Murrell's Avatar
Registered User
 
Join Date: Feb 2000
Posts: 2,574
The previous owner changed the coolant just before he sold the car. The stuff he drained out was likely full of corrosion; hence the condition you found the impeller in.

The impeller may have been made from a material more prone to rusting than the MBs block and coolant passages.

Just a WAG.
__________________
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
Reply With Quote
  #3  
Old 09-24-2017, 02:27 PM
Diseasel300's Avatar
Registered User
 
Join Date: May 2016
Location: Texas Hill Country
Posts: 5,190
What kind of material is the impeller made of? Cast iron? Steel? As said above, the coolant may have been neglected previously in the car's life and if so, the rust wouldn't be unusual. Iron would be more prone to rust than steel, especially if the coolant was old and lost its anti-corrosion properties at some point in the past.
__________________
'11 Honda Accord EX - "The Daily" 70K
'83 500SL Euro - "The Money Pit" 116K
'91 350SD - "Diseasel Jr." 173K
'94 BMW 525i - "The Red Car" 180k
Reply With Quote
  #4  
Old 09-24-2017, 02:31 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,794
Thanks, Mike. That's probably the right track but I have to give credit to the PO. This fellow was open about all the problems with the car and sold it as a non-runner (though I drove it 30 miles home). He did nothing to pretty it up to sell. He just wanted it gone. So maybe it was neglected and at some point then serviced to where the cooling system was cleaned but the impeller didn't recover.

I don't know iron from steel. I know it's ferrous

Sixto
98 E320s sedan and wagon

Last edited by sixto; 09-24-2017 at 02:48 PM.
Reply With Quote
  #5  
Old 09-24-2017, 02:53 PM
Diseasel300's Avatar
Registered User
 
Join Date: May 2016
Location: Texas Hill Country
Posts: 5,190
Usually an iron impeller will be cast (you'll see the rough areas from the sand mold). Steel will usually be stamped, think of a sheet shaped like a saw-blade then pressed so that the "teeth" stand up as the impeller vanes.

__________________
'11 Honda Accord EX - "The Daily" 70K
'83 500SL Euro - "The Money Pit" 116K
'91 350SD - "Diseasel Jr." 173K
'94 BMW 525i - "The Red Car" 180k
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 01:44 PM.


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