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 12-15-2008, 03:40 PM
Registered User
 
Join Date: Jun 2008
Posts: 470
Thermovacuum Valve/Switch Temperature/Color

The ears of the two, red-top, thermo-vacuum valves on the intake manifold of an 81 380sl I'm rebuilding broke off when I tried to remove them, and I'm trying to figure out whether to replace them with the original, red ones, which open at 50 degrees, or yellow ones, which open at 70 degrees.

The CD states "the acceleration enrichment is controlled in dependence of a vacuum at a coolant temperature below 50 degrees C (70 C starting August 1984)," but the parts guy at the local dealer shows the 70 degree valve for the 81, too.

OTOH, various websites still show the 50 degree valve for the 81, or ask for the color to be specified when ordering, and the Performance Products catalog shows that both version were still being used on the 560.

So I was wondering if anybody here happens to know what the pros and cons of using the 70 vs 50 degree valve is. Thanks in advance for any info .

Reply With Quote
  #2  
Old 12-16-2008, 09:08 AM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Use the 70C yellow TV valve. You will have better acceleration when the engine is in the warm-up stage.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
  #3  
Old 12-16-2008, 06:28 PM
Registered User
 
Join Date: Jul 2008
Posts: 1,236
Hey, M.B. Doc, which one would you use for a '90 300SE?


Thanks!!


-tp
Reply With Quote
  #4  
Old 12-17-2008, 07:10 AM
Registered User
 
Join Date: Jun 2008
Posts: 470
Quote:
Originally Posted by M.B.DOC View Post
Use the 70C yellow TV valve. You will have better acceleration when the engine is in the warm-up stage.
Ahhh! Thanks a lot, Doc. I couldn't find the answer to this anywhere. I'll go with the 70C valves then.

Mbboy

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 06:37 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