LI05.10-P-056435 Service Bulletin/Repair Instructions

Rattling noise after engine start for several seconds

Topic number
LI05.10-P-056435
Version
1
Design group
05.10 Camshaft drive
Date
07-16-2013
Validity
Engine 276, engine 278, engine 157
Reason for change

Reason for block
Complaint:
Engine rattling noise after engine start for several seconds
Attachments

File
Designation
Rasselgeräusch nach Motorstart.mp3
Rattling noise after engine start
Cause:
Secondary timing chains might produce a rattling sound during engine start up until the engine oil pressure builds up.

Once there is sufficient oil pressure created in secondary chain tensioners, they provide operating tensions to timing

chains and the rattling stops. No consequential damage is to be expected.
Remedy:
Install non-return valves (check valves) and replace left and right secondary chain tensioners as required. Install

check valves by inserting them into the tensioner oil supply opening in the left and the right cylinder head. Correctly

installed check valves and optimized secondary chain tensioners will minimize oil drainage from tensioners.

Order chain tensioners and check valves directly from parts with part numbers listed. Refer to the applicable engine

number to install correct version of the secondary chain tensioner.

Note:

Verify correct number or a sub through EPC as the secondary chain tensioners might be updated and part numbers

could change.

Install check valves based on information provided in this document and measurements of the oil supply opening diameter in cylinder heads. Refer to the attachments for instructions on how to measure the oil supply opening and how

to install check valves.

Note:

Check valve installation special tool W276 589 00 33 00

Engine 157:

1) From engine number 157 9xx 60 009368 up to engine number 157 9xx 60 017984 install check valves and chain

tensioners

2) From engine number 157 9xx 60 017985 up to engine number 157 9xx 60 022333 (December 2012) install check

valves (optimized tensioners installed in this production range)

07-16-2013 9:11 PM

© Copyright Daimler AG
DOKONIE
Page 1/3
Engine 2768:

1) Up to engine number 276 8xx 30 000790 install check valves and chain tensioners

2) From engine number 276 8xx 30 000791 up to engine number 276 8xx 30 001281 install check valves only

Engine 2769:

1) Up to engine number 276 9xx 30 365996 install check valves and chain tensioners

2) From engine number 276 9xx 30 365997 up to engine number 276 9xx 30 406603 (February 2013) install check

valves only (optimized tensioners installed in this production range)

Engine 278:

1) Up to engine number 278 9xx 30 073273 install check valves and chain tensioners

2) From engine number 278 9xx 30 073274 up to engine number 278 9xx 30 103675 (February 2013) install check

valves only (optimized tensioners installed in this production range)

Note:

When performing repairs and only the check valves are supposed to be installed, the tensioners must still be checked

according to WIS documentation. If optimized tensioner is found to be defective it must be replaced

Note:

Check valves were installed in the factory in the engines above the ranges provided above. In case of 157 engines

either A 278 050 40 00 or A 278 050 33 00 check valves were installed. In engines 276 and 278 check valves A 278

050 33 00 were installed. It is important to measure the oil supply opening in cylinder heads to install correct check

valve.

Note:

If the noise is still present after installation of check valves and correct tensioners or the engine is outside of the ranges provided, open a PTSS case and attach all information including the short test and sound file. The case will be

forwarded to SE.
Attachments

File
Designation
assembling of check valve.pdf
Instructions for installing check valves and measuring the

bore opening
Symptoms

Power generation / Engine noise / Knocking/clacking

Power generation / Engine noise / Chattering

Power generation / Engine noise / Clanking

Power generation / Engine noise / Rattling

Power generation / Engine noise / Clattering

Power generation / Engine noise / Pounding
Parts

Part number
ES1 ES2 Designation
A 276 050 25 00

07-16-2013 9:11 PM

© Copyright Daimler AG
Quantity Note
M276 Left chain tensioner
1
DOKONIE
Chain tensioner as of
EPC Other

make

part

X
Page 2/3
engine 276 9xx 30 129269

A 276 050 26 00
M276 Right chain tensioner
A 278 050 40 00
1
Chain tensioner as of

engine 276 9xx 30 129269
X
Non-return valve (check valve) 2
Smaller oil supply bore - Refer

to notes in Remedy
X
A 278 050 15 00
M157 M278 left chain tensioner
1
Secondary chain tensioner from engine 278 9xx 30

035186 respectively 157 9xx

60 009367
X
A 278 050 16 00
M157 M278 right chain tensio- 1

ner
Secondary chain tensioner from engine 278 9xx 30

035186 respectively 157 9xx

60 009367
X
A 278 050 33 00
Non-return valve (check valve) 2
Installed in factory. Only for cylinder heads with staged bore larger outside diameter (8 mm)
X
A 276 050 23 00
M276 Left chain tensioner
1
Chain tensioner up to

engine 276 9xx 30 129268
X
A 276 050 24 00
M276 Right chain tensioner
1
Chain tensioner up to

engine 276 9xx 30 129268
X
A 278 050 13 00
M157 M278 left chain tensioner
1
Secondary chain tensioner up to engine 278 9xx 30

035185 respectively 157 9xx

60 009366
X
A 278 050 14 00
M157 M278 right chain tensio- 1

ner
Secondary chain tensioner up to engine 278 9xx 30

035185 respectively 157 9xx

60 009366
X
Validity

Vehicle
Engine
Transmission
*
276.958
*
*
276.955
*
*
276.956
*
*
276.954
*
*
276.957
*
*
276.950
*
*
276.952
*
*
278.922
*
*
278.920
*
*
278.928
*
*
278.932
*
*
278.927
*
*
157
*
07-16-2013 9:11 PM

© Copyright Daimler AG
DOKONIE
Page 3/3

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