Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 05-31-2000, 09:50 PM
Posts: n/a
I adjusted my intake valve clearances a while back to specs - they were off by about .001-.002". Now, though, I'm getting a very slight tapping when warm, not really enough to concern me, but want to know if I should be concerned if the clearances are open too much by at most .001". I plan to recheck in the future, but should I make this a priority?

Just checked the archives and found a post claiming that since the engine was designed to use leaded gas, the valve clearances are very important (answered my question I guess!). Spurs a second question of whether any clearance modifications should be made if I'm using unleaded? Any other changes?

[This message has been edited by wjbell (edited 05-31-2000).]
Reply With Quote
Old 06-01-2000, 09:01 AM
Registered User
Join Date: Oct 1999
Location: Tulsa, OK USA
Posts: 139
I check the valve clearance on my 71 250C every two oil changes (6000 miles). I use the "go-nogo" method. Example, .003 fits, .004 will not fit. Since the gaps are "designed" to allow for thermal expansion to maintain the proper clearance, I don't believe any clearance mods are necessary. Perhaps some of the MB techs have a better handle on this one. I, too, get a light tapping when warm. My engine has 130K and the chain/tensioners are good so I have never felt there to be a problem for me.

BTW: I also run a bottle of Redline Total Fuel System stuff every two oil changes also.
Don't know for sure why I really do that - I think it just feels good (or something).

Anyhow, based on my experience (and my 250C is a "daily driver" - except in foul weather) I don't think you have a problem. However, as I stated earlier, perhaps some of the MB techs with all of the "good knowledge" have a better handle on this.

Enjoy the car


Dan Taylor/ Tulsa, OK MBCA '71 250C/'81 300TD-T

[This message has been edited by DANTRCAV (edited 06-01-2000).]
Reply With Quote
Old 06-02-2000, 10:09 PM
Super Moderator
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,315
.001 is a good percentage of the lash.

The guy who worked on my 250C's (great cars!) believes that you should just barely be able to pull the guage through. He also rotated the engine until the appropriate lobe was in the middle of the closed position to adjust. He did them one at a time.

Have fun!

Chuck Taylor
Falls Church VA
'86 300E 5 speed
'95 C220 (wife's car)
'98 Porsche Boxster
Past: '79 280E, '82 300D (18 yrs), '77 240D,
4 250C's
Reply With Quote


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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
240D Proper Valve Clearance?? Correct answer kamil Diesel Discussion 8 02-26-2004 10:31 AM
"Experience" with valve clearance adjustment Calvin Peterson Vintage Mercedes 4 10-09-2002 06:40 PM
Valve Job and Valve Timing gmask Vintage Mercedes 18 09-23-2002 01:21 PM
Burnt valve questions...... Tinker Tech Help 1 08-07-2002 06:05 PM
Valve Clearance Adjustment. What am I Doing Wrong? 73MB280SEL Vintage Mercedes 2 11-24-2000 06:46 PM

All times are GMT -4. The time now is 06:00 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page