2005 Mercedes Benz CLK 320 Technical Service Bulletin # S-01_10-29A Date: 090930

Engine - Surface Cleaning Recommendations/Precautions
Date: September 30, 2009
Order No: S-B-01.10/29a
Supercedes: S-B-01.10/29, July 30, 2009
Group: 01
Revision History
Revision Date Purpose
a 9/30/09 Updated footnotes 1 and 2, in parts information.
- 7/30/09 Initial issue
SUBJECT:
MY-All, Engines 112, 113, 272 and 273
Cleaning Sealing Surfaces
When performing any engine repair or maintenance work where cleaning sealing surfaces is recommended, such as cylinder head cover removal or
installation, always follow the methods described below.
It is important to remember to never use abrasive cloths, pads, paper or any sanding procedures to remove silicon residue. In addition, never use any
sharp-edged tools or wire brushes that will damage the sealing surfaces.
2000 Mercedes Benz CLK 320 (208.365) V6-3.2L (112.940) Page 399
Note:
When preparing and cleaning any surfaces for resealing, extreme care must be taken. Consequent damage resulting from not following the prescribed
methods for cleaning will not be covered by the warranty.
Note:
Use only approved methods to remove any carbon deposits when performing a repair. Do not use any sand paper, abrasive pads or disks or sanding
tools. Use only approved fuel additives. Dealers might be debited when performing unapproved or incorrect repairs as well as when unnecessarily
replacing parts.
Note:
Proper application of sealant is a must as excessive sealant can result in damage to the engine (refer to MTC "M272 Engine Timing"). Failure to
follow these precautions could result in severe and permanent engine damage.
Sealant Removal Procedure

1. Using a rag, wipe away all operating fluids (oil) and any other residue from sealing surface.


2. Observing all manufacturer application directions for product application, spray Loctite 7200 (or substitute as indicated in the parts information

below) on all sealing surfaces and let alone for 10 to 30 minutes.

1. Using a soft (plastic or wood) scraper, scrape away any loosened silicone sealant and wipe with a rag.


2. Note that the sealing surface should now feel even with a visible deposit of silicon sealant remaining (Figure 1). The surface should not be

metallic bright.
5. Thoroughly clean the sealing surface (follow product label directions) with Loctite 7063 (or substitute as indicated in the parts information below)
cleaning spray. Wipe surface when still wet with a dry, clean cloth and blow with compressed air.
6. The Loctite spray should be fully blown off before applying the new silicone sealant (the surfaces must be completely dry); otherwise, leaks may
occur.
Parts Information