Check cylinders for leaks

AR01.00-P-1300OLD

Check cylinders for leaks

3.8.15

Engine

651 in model 205, 253

1

Belt pulley/vibration damper

2

Pressure loss tester

 Danger !

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

 Danger !

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

1

Bring engine up to operating temperature (approx. 80°C)

 Check for cylinder leakage when engine is at normal operating temperature.

2

Turn off engine

3

Remove engine cover

 Installation: Ensure correct seating of the engine cover.

4

Detach fuel filter and place with attached fuel line to one side



AP47.20-P-0780EWD

5

Remove glow plugs

AR15.20-P-4111OLD

6

Position piston of cylinder to be checked at TDC (ignition TDC) using the counterholder

 Turn engine at the belt pulley/vibration damper (1) for the crankshaft. Turn engine in direction of engine rotation.

 Counterholder

*651589074000

7

Attach pressure loss tester (2)

AR01.00-P-1300-01OLD

  Calibrate the pressure loss tester (2).

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

 Screw-in fitting

*642589026300

 Pressure loss tester

*450589172100



Check

8

Check for cylinder leakage



Determine loss of pressure at cylinder

AH01.00-N-1300-02A

  Pressurize cylinder with compressed air and read off pressure loss at the pressure loss tester (2).

 If high pressure loss exists, determine cause.

Cylinder leaktightness: Permissible losses at pistons and piston rings

*BE01.00-P-1003-02Z

Cylinder leaktightness: Permissible losses at valves and cylinder head gasket

*BE01.00-P-1002-02Z

Cylinder leakage: permissible loss total indication

*BE01.00-P-1001-02Z

9

Check further cylinders according to engine firing order

AR01.00-P-1300-03T

10

Install in the reverse order

Cylinder leakage

Number

Designation

ENGINE all

BE01.00-P-1001-02Z

Cylinder leakage: permissible loss total indication

%

25

Cylinder leakage

Number

Designation

ENGINE all

BE01.00-P-1002-02Z

Cylinder leaktightness: Permissible losses at valves and cylinder head gasket

%

10

Cylinder leakage

Number

Designation

ENGINE all

BE01.00-P-1003-02Z

Cylinder leaktightness: Permissible losses at pistons and piston rings

%

20