Inspect cylinders with a light probe

AR01.00-G-0200MG

Inspect cylinders with a light probe

15.11.2019

Engine

935.9 in model 800.011

1

Probe

2

Endoscope

 Danger

Risk of death when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)

Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines.

AS00.00-Z-0035-01A

 Danger

Risk of explosion due to escaping combustible gas or overheating of gas cylinders.Risk of injury caused by burns to skin and eyes. Risk of frostbite to body parts caused by escaping gas and by touching components near the valves when emptying gas cylinders. Risk of poisoning or suffocation caused by inhaling gas.

Remove any sources of ignition.
Protective clothing, safety gloves and safety glasses must always be worn.
Ensure that the work area is adequately ventilated.
When working on vehicles at ambient temperatures over 60 °C, all gas cylinders must be removed.

AS00.00-Z-0018-01A

 Warning

Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.

Wear protective gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

 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

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-N-5000-01H

Notes on work safety regulations for vehicles with natural gas-powered engines

AH00.10-N-1000-04A



Remove

1

Start engine, bring to operating temperature, and switch off.

 See information from body manufacturer.
Coolant temperature  80 °C.

2

Attach turning device for engine.

AR03.30-G-1600-03M

 Screw/bolt, turning device to flywheel housing

*BA01.60-N-1002-01Q

 Turning device

*904589046300

3

Remove spark plugs.



AP15.10-G-1580MG

Illuminate

4

Connect sensor (1) to endoscope (2).

 Pay attention to manufacturer's operating instructions. Use sensor (1) with a diameter of  8.5 mm.

5

Insert sensor (1) through the spark plug bore in the cylinder to be checked.


The sensor (1) must not make contact with or hit against the piston crown.
Otherwise, the sensor tip may be damaged.

6

Switch on endoscope (2).

7

Position piston on the cylinder to be checked at bottom dead center.

 Check position of the piston using the endoscope (2) and turn crankshaft with the  turning device.

 Turning device

*904589046300

8

Check condition of cylinder barrel, piston crown, clearance volume, and valves.

If damage is present or in cases of doubt,



remove cylinder head.

AR01.30-G-5800NG

9

If necessary, check remaining cylinders in the same way.

 All cylinders can be checked using 3 crankshaft positions: cylinder 1 and 6, 2 and 5 or 3 and 4.



Install

10

Install spark plugs.



AP15.10-G-1580MG

11

Remove turning device for engine.

AR03.30-G-1600-03M

 Screw/bolt, TDC inspection hole cap to flywheel housing

*BA01.60-N-1001-01Q

 Timing case, flywheel housing

Number

Designation

Engine 935.9

BA01.60-N-1001-01Q

Screw/bolt, TDC inspection hole cap to flywheel housing

Nm

30

 Timing case, flywheel housing

Number

Designation

Engine 935.9

BA01.60-N-1002-01Q

Screw/bolt, turning device to flywheel housing

Nm

30