Check cylinders for leaks

AR01.00-P-1300MRT

Check cylinders for leaks

03.04.2018

Engine

256.9 in model 222

1

Pressure loss tester

2

Adapter

 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

 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 injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.

Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers.
Wear protective gloves, protective clothing and safety glasses.

AS20.00-Z-0001-01A

 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



Remove

1

Warm up engine to normal operating temperature.

 Only check cylinder leakage when the engine is at normal operating temperature.

2

Switch off the ignition and keep the transmitter key outside the transmitter range (at minimum 2 m).

3

Remove spark plugs.



AP15.10-P-1580E

4

Remove cap of coolant expansion reservoir.

5

Take off oil filler cap.

6

Attach TDC detection device to the cylinder to be checked.

 Commercially available devices/tools
The TDC detection device

7

Turn engine at vibration damper using counterholder in direction of engine rotation until piston of cylinder to be checked is at top dead center (TDC).

 The piston of the cylinder to be checked must be at ignition TDC.

 Counterholder

*654589004000

8

Remove TDC detection device from cylinder to be checked.

 Commercially available devices/tools
The TDC detection device

9

Connect adapter (2) and pressure loss tester (1) to cylinder to be checked.


Calibrate pressure loss tester (1) before use.
Measurement errors occur otherwise.

 Pressure loss tester

*450589172100

 Adapter

*256589019100



Check

10

Apply compressed air to cylinder to be checked and read pressure loss from pressure loss tester (1).

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

If the crankshaft rotates:



Install retaining lock for crankshaft.

AR03.30-P-5001MRT

11

Check other cylinders in firing order of engine.

AR01.00-P-1300-03MRT



Install

12

Remove retaining lock.

For an installed retaining lock.

AR03.30-P-5001MRT

13

Disconnect pressure loss tester (1).

 Pressure loss tester

*450589172100

14

Remove adapter (2).

 Adapter

*256589019100

15

Attach oil filler cap.

16

Attach cap of coolant expansion reservoir.

17

Install spark plugs.



AP15.10-P-1580E

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