Check cylinders for leaks

AR01.00-P-1300OID

Check cylinders for leaks

14.11.2018

Engine

656 in model 167

1

Pressure loss tester

 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

 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

 

Remove/install

1

Warm up engine to normal operating temperature and switch off engine.

2

Remove glow plugs.

AR15.20-P-4111OID

3

Remove front noise insulation.

4

Remove impact plate.

5

Position piston of cylinder to be checked at top dead center (ignition TDC) using counterholder.

 Commercially available devices/tools
The TDC detection device

 Rotate engine at belt pulley in direction of engine rotation.

 Counterholder

*654589004000

6

Calibrate the pressure loss tester (1).

 Pressure loss tester

*450589172100

7

Connect pressure loss tester (1) to the glow plug holes.

AR01.00-P-1300-01OIA

  Use a screw-in piece without check valve.

 Pressure loss tester

*450589172100

 Screw-in fitting

*642589026300



Check

8

Apply compressed air to the cylinder and read off pressure loss from pressure loss tester (1).

Determine loss of pressure at cylinder

AH01.00-N-1300-02A

Cylinder leakage: permissible loss total indication

*BE01.00-P-1001-02Z

Cylinder leaktightness: Permissible losses at valves and cylinder head gasket

*BE01.00-P-1002-02Z

Cylinder leaktightness: Permissible losses at pistons and piston rings

*BE01.00-P-1003-02Z

 Pressure loss tester

*450589172100

If the pressure loss is increased,



Determine cause.

9

Perform check of additional cylinders in engine firing order.

AR01.00-P-1300-03OIA

10

Install in the reverse order.

Cylinder leakage

Number

Designation

Engine all (4xWD, CAR, smart)

BE01.00-P-1001-02Z

Cylinder leakage: permissible loss total indication

%

 25

Cylinder leakage

Number

Designation

Engine all (4xWD, CAR, smart)

BE01.00-P-1002-02Z

Cylinder leaktightness: Permissible losses at valves and cylinder head gasket

%

 10

Cylinder leakage

Number

Designation

Engine all (4xWD, CAR, smart)

BE01.00-P-1003-02Z

Cylinder leaktightness: Permissible losses at pistons and piston rings

%

 20