Inspect cylinders with a light probe

AR01.00-P-0200MFG

Inspect cylinders with a light probe

26.11.2019

Engine

139 in model 118, 177, 247

1

Endoscope

 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

 Caution

Risk of injury to skin and eyes due to handling of engine oil. Risk of poisoning caused by swallowing engine oil

Wear protective gloves, protective clothing and safety glasses.
Do not fill engine oil into beverage containers.

AS18.00-Z-0001-01A

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

 

Remove/install

1

Remove spark plugs.



AP15.10-P-1580J

 Installation: Only install upper engine cover after the leak test.

2

Remove front section of the front right fender liner.

AR88.10-P-1301MFA



Check

3

Turn engine at belt pulley of crankshaft in direction of engine rotation until piston of cylinder to be checked is at bottom dead center (BDC).


Do not turn engine opposite direction of engine rotation.
Otherwise, the timing chain will jump and engine damage will occur.

 Counterholder

*654589004000

4

Connect endoscope (1) and insert flexible endoscope through spark plug thread bore into the cylinder to be checked.

5

Check cylinder barrel, piston crown, and valves.

General information on checking valves, valve seats and valve guides

AH05.30-P-1000-02SZ

General information on inspecting cylinder walls

AH01.00-P-0300-01AMG

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

If "scoring" (wear to the cylinder) is recognizable,



Remove cylinder head and check cylinder barrel again.

AR01.30-P-5800MFG

6

Perform check of additional cylinders in same manner.

7

Install in the reverse order.

8

Carry out engine test run and check engine for proper leak tightness and leak tightness.

9

Install upper engine cover.



AP01.10-P-2405-01K