NHTSA ID Number: 10135950
Manufacturer Communication Number: LI03.20-P-048278
TSB/Document Date: 2018-05-07
Summary
Engine makes intermittent knocking noise, ticking/crackling
Engine makes intermittent knocking noise, ticking/crackling
Topic number
LI03.20-P-048278
Version
3
Design group
03.20 Crankshaft
Date
03-26-2013
Validity
Model series 211, 219 with OM 642
Model series 164, 251 with OM 642
Model series 203, 204, 209, 221, 461, 463 with OM 642
Reason for change
New part number for upper main bearing shell, bearing
point 1
Reason for block
Complaint:
The engine makes ticking/crackling noises at idle speed and at speeds up to approx. 1500 rpm.
Notes:
•
•
•
•
•
•
The noise occurs after a mileage of approx. 20,000 km or after an oil change.
Noise can be clearly heard in area of 1st crankshaft main bearing.
Noise can no longer be heard when the poly-V belt is removed.
It is essential to compare the noise of the complaint vehicle with the example sound file attached!
Noise is irregular. Pulse-like crackling noise occurs at irregular intervals - compare with attachment.
20 pulses (ticking) which represent justifiable complaints can be heard in the attachment.
Attachments
File
Designation
Tickern OM642_neu.mp3
Crackling noise, isolated ticking/crackling
Cause:
Run-in effect of 1st crankshaft main bearing.
Scope of test:
Remove/install poly-V belt.
- Run engine with poly-V-belt. Compare to attached reference noise file.
- Run engine without poly-V-belt and listen if the noise is still there.
Note:
If the ticking still occurs after the poly-V belt is removed, there is no defect at the main bearing shells of the 1st
crankshaft main bearing. Proceed further to determine the cause.
If the ticking is gone after the poly-V belt is removed, there is a defect at the main bearing shells of the 1st crankshaft
main bearing. Remove/install bearing shells of 1st crankshaft main bearing must be replaced.
Remedy:
03-26-2013 8:06 PM
© Copyright Daimler AG
DOKONIE
Page 1/4
Replacement of bearing shells of 1st crankshaft main bearing
Note:
Make sure that only the new/lead-free bearing shells are used. Observe the part number while the component is still
packaged - there is no object number on the component! The old bearing shells look different from the new ones. To
compare them, refer to the illustration in the attachment.
Procedure for replacement of bearing shells of 1st crankshaft main bearing, model series 211:
1. Remove belt pulley with vibration damper.
2. Determine bearing classification.
Note:
The main bearing shells exist in various type and tolerance classifications which are subdivided into different color codes. This means that the upper main bearing shell of a bearing may have a different color code from the lower main
bearing shell. It is important to select the correct main bearing shell for the specific position - according to the defined
specifications. For the positioning of the bearings: The bearing class information runs from left (1st main bearing) to
right (2nd - 4th main bearings). Meaning of color codes (color index): G = yellow (54), R = red (56), B = blue (52), W =
white (57), V = violet (58).
The tolerance class is determined based on the following specifications (see attachment "Bearing classification"):
- for the upper bearing shell on the cylinder crankcase,
- for the lower bearing shell on the front crankshaft end.
3. Disconnect battery ground line.
4. Remove underfloor soundproofing.
5. Remove automatic transmission.
6. Remove crankshaft drive plate.
7. Remove oil pan.
8. Remove oil pump.
9. Detach A/C compressor.
Note:
Detach A/C compressor from cylinder crankcase and tie up to one side with lines connected.
10. Remove crankshaft bearing cap of 1st crankshaft main bearing.
Note:
Do not remove the remaining main bearing caps.
Chain tensioner does not have to be removed.
11. Remove/install new bearing shells of 1st crankshaft main bearing.
Note: Using a soft tool (plastic wedge or brass strip approx. 4 mm thick), press out the main bearing shell from the side without the guide lug and pull out from the other side using the holes in the main bearing shell. Be careful not do
damage or scratch the bearing surface of the crankshaft (see picture of brass strip in attachment).
03-26-2013 8:06 PM
© Copyright Daimler AG
DOKONIE
Page 2/4
Coat new bearing shells with engine oil and install. Make sure that the main bearing shell/guide lug is correctly engaged.
12. Install crankshaft bearing cap of 1st crankshaft main bearing.
13. Replace crankshaft radial sealing ring.
14. Reassemble the removed components in the reverse order.
15. Check oil level in automatic transmission.
16. Carry out a quick test after repair.
17. Clean engine.
For the repair scope "Replacement of main bearing shells of 1st crankshaft main bearing" refer to the operation numbers for the relevant model series. Refer to the respective valid repair instructions for the tightening torques.
Attachments
File
Designation
Lagerklassifizierung.pdf
Information on classification of bearing shells of crankshaft main bearing on cylinder crankcase and on crankshaft journals.
Symptoms
Power generation / Engine noise / Ticking
Parts
Part number
ES1 ES2 Designation
Quantity Note
EPC Other
make
part
A 642 033 19 01
Upper main bearing shell (in
1
cylinder crankcase) for bearing
points 2-4, see Figure (A)
Index by color code required
X
A 642 033 08 02
Lower main bearing shell (in
bearing cap), see Figure (B)
1
Index by color code required
X
A 642 033 22 01
Upper main bearing shell (in
1
cylinder crankcase) for bearing
point 1, see Figure (A)
Index by color code required
X
Attachments
File
Designation
Neue Glyco Lagerschalen.jpg
Visible differences between installed crankshaft bearing
shells and replacement crankshaft bearing shells (picture)
Messingstreifen.JPG
Brass strip for pressing out the main bearing shell
Validity
Vehicle
03-26-2013 8:06 PM
© Copyright Daimler AG
Engine
DOKONIE
Page 3/4
164.120
642
*
164.122
642
*
164.125
642
*
164.822
642
*
164.825
642
*
204.022
642.960
*
204.089
642.961
*
204.222
642.960
*
204.289
642.961
*
221.022
642.930
*
221.080
642.932
*
221.122
642.930
*
221.180
642.932
*
251.020
642
*
251.022
642
*
251.026
642
*
251.122
642
*
251.125
642
*
251.126
642
*
461.304
642
722
461.334
642
722
461.344
642
722
461.346
642
722
463.303
642.970
*
463.340
642.970
*
463.341
642.970
*
C (203)
642
*
CLK (209)
642
*
CLS (219)
642
*
E (211)
642
*
03-26-2013 8:06 PM
© Copyright Daimler AG
DOKONIE
Page 4/4
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TSB/Document ID: LI03.20-P-048278
Replacement Service Bulletin Number:
MFR Communication Date: 2013-03-26
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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