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 12-12-2007, 03:45 PM
Registered User
 
Join Date: Dec 2007
Posts: 1
Question Overheating 300cd

Hi, earlier this year I bought an 82 300cd(my first mercedes)with 170K + on the odometer(not working). The car ran great for about 3 months until it overheated on a very warm summer day. I parked it and tried to find the problem. The Radiator had a cold spot at temp. so I put a new one in. This didn't solve the problem as after about 50 miles of driving on a cold day it got warm(hot) again so I parked it again. Yesterday I deciced to crank it up and see if I could spot something, I did. After letting it warm up a bit I pulled the oil fill cap and noticed steam coming out, not good. However there doesn't seem to be any water in the oil pan. What bothers me is the motor runs really good even when it was overheating. I don't know alot about mercedes diesels so I'm not sure what to do now . Is this a head gasket issue or a possible cracked head, is there a way to tell which without tearing the motor down? Or do I need to roll up my sleeves and tear off the top end(I am capable). Also if it's a cracked head are these heads repairable. I really like this car and would like to get it back on the road so any help would be much appreciated. Thanks Moconn.
Reply With Quote
  #2  
Old 12-12-2007, 09:08 PM
johntksr's Avatar
Registered User
 
Join Date: Jan 2007
Location: Prattville, AL
Posts: 126
water pump is gone

Replace the water pump. It is an easy DIY job and will cost about $50 for the pump. You should find plenty of threads that describe how to replace.

I had a similiar experience...although I did not have steam from the oil filler cap.
Reply With Quote
  #3  
Old 12-12-2007, 09:35 PM
Registered User
 
Join Date: Apr 2005
Location: Austin, TX
Posts: 631
Quote:
Originally Posted by moconn View Post
I pulled the oil fill cap and noticed steam coming out
Are you sure it was steam (water vapor) and not oil mist? The oil mist in the 'blowby' gases are collected at the air filter and returned to the crankcase. The oil mist looks somewhat like steam, and you can see it if you open the oil filler cap.
__________________
Bob
'82 300D Petrol B-G Metallic
Reply With Quote
  #4  
Old 12-12-2007, 09:45 PM
toomany MBZ's Avatar
Registered User
 
Join Date: Nov 2006
Location: central Va
Posts: 7,820
Quote:
Originally Posted by techguy512 View Post
Are you sure it was steam (water vapor) and not oil mist? The oil mist in the 'blowby' gases are collected at the air filter and returned to the crankcase. The oil mist looks somewhat like steam, and you can see it if you open the oil filler cap.
Agreed, and over heating, to what temp? Or did you hear things you should not have? Anyway, a new thermostat is the cheapest thing to replace.
What color is the oil when looking in the cam cover? Normal black color, OK, a milky light brown color = not good, oil and water mixing.
Water pumps USUALLY let you know they need replacing by leaking fluid at the weep hole on the pump itself.
__________________
83 SD

84 CD
Reply With Quote
  #5  
Old 12-12-2007, 09:55 PM
lutzTD's Avatar
Registered User
 
Join Date: Oct 2006
Location: Lutz, Florida (N of Tampa)
Posts: 2,458
before you go tearing into it, see if you can get a pressure tester and test the system. Dont forget the cap, its a common issue and easily overlooked. If there is a pressure leak, the coolant will boil. If there is no pressure leak then there is an obstruction or no movement, check the t-stat to see if it is opening or just replace it, then all thats left is the pump.
__________________

1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)
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 01:08 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, 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