LI03.10-P-060916 Service Bulletin/Repair Instructions

Clattering/rattling engine noise on deceleration

Topic number
LI03.10-P-060916
Version
9
Design group
03.10 Connecting rods, pistons
Date
06-29-2016
Validity
Engine 274.920 (LS)

Modified wrist pins are installed as of engines: 274 920

E0 043259 (as of about April 20, 2015)

and 274 920 30 406602 (as of about March 27, 2015)
Reason for change
Document revised
Reason for block
Complaint:
Clattering/rattling or knocking noise from the crank assembly of the engine when cold at oil temperatures up to approx. 50°C mostly heard on engine deceleration.

The noise diminishes with the increased engine temperature and is unnoticeable with engine at operating temperature.
Attachments

File
Description
M274 LS engine noise.MP3
noise example
Cause:
The knocking noise might be attributed to the unfavorable tolerance of the piston wrist pin resulting in enlarge end

float of the connecting rod in the piston.
Remedy:

Note:
The following tests must be performed with the engine cold (engine oil temperature must be lower than 50°C):

- Compare engine sound with another vehicle and to attached sound file (the normal sound related to the injectors

shutting off during engine deceleration or other general sounds of operation of an direct injected engine might be mistaken for an abnormal engine noise).

- Perform other checks; switch on and off electrical consumers (A/C, lights, radio, etc.) and assess engine sound

- Observe any changes in noise levels with oil pressure switch disconnected and drive belt removed

- Increase the idle speed (constant rpm) and engine load and assess whether the noise changes

- Assess engine noise at engine oil temperature >80°C

If it is determined that the complaint relates to that described under "Cause", the repair would require replacement of

all connecting rods, pistons and rod bearings (some needed replacement parts are listed in parts table).

Note:

06-29-2016 4:01 PM

© Copyright Daimler AG
DOKONIE
Page 1/3
It is no longer required ordering individual pistons, connecting rods and bearings since kit containing these parts is

now available (refer to parts information table).

The Lanchester balancer bolts must be replaced during repair.

Refer to the EPC for other parts needed in repairs outside of the piston kit.

Note:

Refer to the attachment for a WIS draft document with instructions for pistons r&r - or go to temporary postings on

STI. Follow other WIS documents during repair (such as instructions for adjusting backlash play at Lanchester balancer).

Note:

Please ensure parts availability before scheduling an appointment for repairs. Follow parts return policy on replacement parts as the pistons and rods will be inspected at the QEC
Attachments

File
Description
Remove_install piston.pdf
Remove/install piston
Symptoms

Power generation / Engine noise / Knocking/clacking

Power generation / Engine noise / Chattering

Power generation / Engine noise / Rattling

Power generation / Engine noise / Clattering
Parts

Part number
ES1 ES2 Designation
Quantity Note
EPC
A 002 990 24 03
Lanchester balancer bolt
2
X
A 003 990 04 03
Lanchester balancer bolt
2
X
A 274 016 00 20
Cylinder head gasket
1
X
A 000 016 05 69
Cylinder head bolts
10
X
A 274 037 03 00
Piston repair kit
1
X
WIS-References

Document number
Title
AR01.10-P-2401MRA
Remove/install engine with

transmission
Remedy
AR01.30-P-5800MRB
Remove/install cylinder

head
Remedy
AR03.20-P-1100MRA
Remove/install Lanchester

balancer
Remedy
06-29-2016 4:01 PM

© Copyright Daimler AG
Note
DOKONIE
Allocation
Page 2/3
Validity

Vehicle
Engine
Transmission
C (205) - 205.048
274.920
725
C (205) - 205.048
274.920
722
C (205) - 205.049
274.920
722
C (205) - 205.148
274.920
722
C (205) - 205.148
274.920
725
C (205) - 205.248
274.920
722
C (205) - 205.248
274.920
725
06-29-2016 4:01 PM

© Copyright Daimler AG
DOKONIE
Page 3/3

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