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 02-09-2011, 01:36 PM
Registered User
 
Join Date: Feb 2006
Posts: 56
Smile Prefered temperature while underway?

I have just purchased a 1980 300sd with 113,000 miles on it. I also have a 84 300sd with 250,000 on it. The 80 runs at 100 on the temp gauge where the 84 runs at 80 on the temp gauge. Outside temp was 73f today so not to hot. I am in SO fl and this is always a concern to me. I wasn doing a steady 50mph for at least 10 miles and the gauge went from estimated 98 to 102. I am not converting so that is what the gauge reads. I read in a thread on this forumn that 100 is prefered. Since for the lst 6 years I have had 80 as my benchmark is this going to cause a problem for this car. I have a 80 degree thermostat in the garage but if I do not have to install it would not bother me. Idling in the shop doing a trans fluid and filter change it registered just over 80 for 15 to 30 minutes. When I took it out on the road is when the temp went up. My wagon and coupe all run just over 80 also. Could I have a defective thermostat or is a 100 degree rating also a thermostat ?
Reply With Quote
  #2  
Old 02-09-2011, 01:44 PM
MattBelliveau's Avatar
Gotta another one...
 
Join Date: Jun 2005
Location: NE Ohio
Posts: 1,685
for the 617, I believe 85-90c is in spec. 100 sounds a little high to me. I would change your thermostat first, but keep in mind that (based on my experience), they usually fail in the open position, making the engine actually run a bit cooler rather than hot. Don't quote me on that, though.
__________________
1989 300E 144K
Reply With Quote
  #3  
Old 02-09-2011, 01:49 PM
sjh sjh is offline
Banned
 
Join Date: Oct 2009
Posts: 580
My 1975 240D ran at 80.

My 1981 300D N/A ran at 80.

My 1990 300D - Turbo runs at 80.

All temps are higher during very hot weather with AC and/or extensive climbing of steep grades. I don't think they ever got above ~90, even in the most extreme case.

Now my E430 when the fan went through the radiator. Then the temp went up a bit!

Last edited by sjh; 02-09-2011 at 03:39 PM.
Reply With Quote
  #4  
Old 02-09-2011, 03:22 PM
Biodiesel300TD's Avatar
|3iodiesel300T|)
 
Join Date: Dec 2004
Location: Albany, OR
Posts: 4,845
Between 80 and 90C. Is where you want your temp. 100 is getting a little hot. Your t-stat could be stuck partially close, or you could have some buildup in the system not allowing proper flow. I too am used to the t-stats failing open causing low temps issues. Also make sure all the fins on the raditor are clean and straight. Not enough oil can also cause temps to creep up.
__________________
Andrew
'04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold
'77 300D ~ Sold
Reply With Quote
  #5  
Old 02-09-2011, 03:30 PM
Registered User
 
Join Date: Sep 2005
Location: Miami, FL
Posts: 407
Mine runs around 82c in the winter and 85c in the summer with the A/C going and on a hot day. I think a coolant flush and fill with G-05 Zerex and a new thermostat and gasket would be a good place to start for your car.
Reply With Quote
  #6  
Old 02-12-2011, 08:22 AM
Registered Diesel Burner
 
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
You should also consider that your car's thermometer is not necessarily an accurate instrument. Mine jumps up and down about 10 degrees with an obvious electrical connection problem.
__________________
--------------------------
1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
Reply With Quote
  #7  
Old 02-12-2011, 11:33 AM
Aquaticedge's Avatar
Bump on a log
 
Join Date: Nov 2009
Location: See Biography
Posts: 3,148
my 87 runs at 84 and my 95 Gasser runs at 85..
__________________
hum.....
1987 300TD 311,000M Stolen. Presumed destroyed
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 03:45 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, 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