Engine - Misfire Or Oil Consumption Service Guidelines
Date: March 29, 2010
Order No.: S-B-01.30/28a
Supersedes: S-B-01.30/28 June 8, 2009
Group: 01
Mercedes-Benz A220 2020 Page 339
Revision History
Revision Date Purpose
a 3/29/10 Bulletin text modified
- 6/8/09 Initial issue
SUBJECT:
MY-All, All Models Equipped with M272 and M273 Engines
Cylinder Head-Related Complaint Guidelines
If you receive customer reports regarding vehicles equipped with Engine 272 or 273 related to a misfire or oil consumption, follow the guidelines
herein to determine further actions.
Perform checks and / or repairs according to published WIS (such as, AH01.00-P-0300-01VA), DTB (such as S-B-07.61/72a - misfire codes; DTBs
and LIs in group 18 or 01 related to oil consumption) and other official documents.
Note:
Do not replace cylinder heads based on suspicion alone and follow the guidelines to make a proper determination. Only the compression and leak
down test values taken from engines at operating temperature could be taken for consideration. Proper inspection of combustion chamber requires
MB Special Tools approved Borescope.
Note:
Use only approved methods to remove any carbon deposits when performing a repair. Mechanical carbon deposit cleaning (and use of any sand
paper, abrasive pads or disks or sanding tools) is not allowed under warranty and cylinder heads should not be removed to do that. Use only
approved fuel additives - Keropur part # A000 989 25 45 12. Dealers might be debited when performing unapproved or incorrect repairs as well as
when unnecessarily replacing parts.
Note:
If the guideline test steps are inconclusive, revert to the SDS guided test as indicated by the DTB S-B-07.61/72a and / or properly determine a root
cause of the complaint.
Mercedes-Benz A220 2020 Page 340
Mercedes-Benz A220 2020 Page 341
Mercedes-Benz A220 2020 Page 342
Complaint Process Guidelines (Pages 2-4) shown above.
