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

LinkBack Thread Tools Display Modes
Old 08-09-2004, 02:34 PM
Registered User
Join Date: May 1999
Location: Pensacola, FL USA
Posts: 48
Valve adjustment on M116 & 117 Engines

My question pertains to Mercedes engines M116 and 117 and using the “go-no go” gauge in establishing the unloaded “basic position” of the “hydraulic lash compensator” (HLC) a.k.a. as the “hydraulic ball stud assembly".

As experienced by those who have replaced “rocker arms” on these engines, when using the “go-no go” gauge, the “Mercedes Service Manual CD” advises to install the appropriate size “thrust/shim pieces” (a.k.a. as hockey pucks) so that the measuring edge is in the center of the “1.2 mm red measuring groove”. This is the “ideal” basic position of the hydraulic lash compensator.

In practice, however, this “ideal basic position” cannot always be achieved. There are those instances, for example, where the insertion of a 5.1 mm thrust piece causes the “measuring groove”to ride a bit LOWER than ideal (calling for a thinner, 4.75 mm, thrust piece). Then, when the thinner thrust piece is inserted it makes the “red measuring groove” ride a bit HIGHER than ideal. In both cases, the low and high deviations from the ideal position are near equal in magnitude.

When you have the situation described above, what is the best approach: “Is it best to opt for the thicker thrust piece....... or use the thinner thrust piece..........or does it really matter?”

Thank you for responding.

Reply With Quote
Old 02-09-2006, 08:14 PM
BDBENZ's Avatar
Registered User
Join Date: Jul 2002
Location: Columbus, OH
Posts: 197
Revising Old Post

I am going through and checking valve adjustments and have the same question as William in his post. I could use some guidance.

87 560 SL
93 300E 2.8
91 300CE-24
Reply With Quote
Old 02-10-2006, 08:19 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The adjustment process isn't that easy & many times you will get a FALSE reading. BEFORE you try to make any adjustment allow the cam lobe on the incorrectly adjusted valve completely depress that rocker for 45-60 seconds. Then put the TOOL over the rocker & look at the groove on the go-no part of the shaft. IF you are still off then get the next smaller(or larger) shim & DO that same process with the cam lobe holding the valve open & the lifter compressed...then you should see a change in position.

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


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 08:59 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page