Inspect cylinders with a light probe

AR01.00-P-0200CD

Inspect cylinders with a light probe

08.08.2019

Engine

651 in model 166, 172, 204, 207, 212, 218, 221

Modification notes

05.08.2019

Notes document AH05.30-P-1000-02SZ added.

Operation step 7.

1

Light projector

2

Flexible endoscope

 Danger

Risk of explosion caused by fuel igniting. Risk of injury to skin and eyes caused by fuel spraying out at high pressure

Keep all ignition sources out of hazard area.
Do not carry out any work on system when it is pressurized.

AS07.16-Z-0001-01A

 

Remove/install

1

Switch off ignition and store transmitter key outside of transmission range (min. 2  m).

 For vehicles with code (889) Keyless Go, press Start-Stop button repeatedly until the ignition is switched off.

2

Open hood.

Engine 651 in model 166, 172, 204, 207, 212, 218, 221

Model 166 with engine 651

AR88.40-P-1000GQ

Engine 651 in model 172.4

AR88.40-P-1000V

Engine 651 in model 204.3, 207, 212

AR88.40-P-1000EW

3

Remove cylinder head cover trim.

Engine 651 in model 166, 172, 204, 207, 212, 218, 221

Engine 651 in model 204, 207

AR01.20-P-5014-02CD

4

Remove fuel injectors.

AR07.16-P-1000CD

5.1

Move piston of cylinder to be checked with counterholder to the bottom dead center.

Engine 651 in model 166, 172, 204, 207, 212, 218, 221
except code B03 (ECO start/stop function)

 Rotate engine at the crankshaft in direction of engine rotation. Do not turn engine against the direction of rotation.

 Counterholder

*651589004000

5.2

Move piston of cylinder to be checked using a suitable tool to the bottom dead center.

Engine 651 in model 166, 172, 204, 207, 212, 218, 221
with code B03 (ECO start/stop function)

 Rotate engine at the crankshaft in direction of engine rotation. Do not turn engine against the direction of rotation.

6

Connect light projector (1) and insert flexible endoscope (2) through bore of the injector into cylinder.



000 588 01 21 00 Endoscope

WS01.00-P-0097B



Check

7

Check cylinder barrel for scoring.

General information on checking valves, valve seats and valve guides

AH05.30-P-1000-02SZ

General information on inspecting cylinder walls

AH01.00-P-0300-01A

 If there is 'scoring' (wear to the cylinder), the cylinder barrel has become rough and honing marks are no longer visible.

If the cylinder barrel is roughened and the honing marks are no longer visible,



Remove cylinder head.

Engine 651 in model 204, 207, 212, 218, 221

AR01.30-P-5800CD

8

Check remaining cylinders in an analog fashion.

9

Install in the reverse order.

 Warning

Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.

Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

10

Check fuel system for leaks with engine running.