Check cylinders for leaks

AR01.00-P-1300CD

Check cylinders for leaks

23.4.12

 

Remove/install

 Danger!

Risk of injury to skin and eyes caused by handling hot or glowing objects.

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

AS00.00-Z-0002-01A

 Danger!

Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running

Secure vehicle to prevent it from moving by itself.
Wear closed and snug-fitting work clothes.
Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

 Danger!

Risk of explosion caused by fuel igniting. Risk of injury to skin and eyes caused by fuel spraying out at high pressure

Keep all ignition sources out of hazard area.

Do not carry out any work on system when it is pressurized.

AS07.16-Z-0001-01A

1

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

 Only check compression pressure when engine is at normal operating temperature.

2

Switch off ignition

 On vehicles with code (889) Keyless Go, press Start-Stop button repeatedly until the ignition is switched off.

3

Open engine hood

MODEL 166.0

AR88.40-P-1000GQ

Model 172.4

AR88.40-P-1000V

Model 204.3, 207, 212

AR88.40-P-1000EW

Model 218, 221

4

Remove cylinder head cover trim

Model 204

AR01.20-P-5014-02CD

Model 166, 172, 212, 218, 221

5

Remove fuel filter

 Place to the side with lines still connected.

Model 204

AP47.20-P-0780CWD

Model 166, 172, 207, 212, 218

AP47.20-P-0780EWD

Model 221

AP47.20-P-0780SXI

6

Remove ceramic glow plugs

AR15.20-P-4111CD

7.1

Position piston of the cylinder to be tested with a counter holder at top dead center (TDC)

Except code (B03) ECO start-stop function

 Rotate engine on vibration damper of the crankshaft. Do not turn engine against the direction of rotation of engine.

 Counterholder

*651589004000

7.2

Position piston of the cylinder to be tested using a suitable tool at top dead center (TDC)

With code (B03) ECO start/stop function

 Rotate engine on vibration damper of the crankshaft. Do not turn engine against the direction of rotation of engine.

8

Connect cylinder leakage tester (1)

 Calibrate cylinder leakage tester (1).

AR01.00-P-1300-01HB

 Intermediate piece

*611589026300

 Screw-in fitting

*642589006300

Cylinder leakage tester (pressure loss)

gotis://A_01_04.0



Checking

9

Charge cylinder with compressed air and read off pressure loss on cylinder leakage tester (1)

Cylinder leakage: permissible loss total indication

*BE01.00-P-1001-02Z

Cylinder leakage: permissible losses at valves and cylinder head gasket

*BE01.00-P-1002-02Z

Cylinder leakage: permissible losses at pistons and piston rings

*BE01.00-P-1003-02Z

 If the crankshaft turns, counterhold engine on the crankshaft vibration damper using an assistant.

 Counterholder

*651589004000

10

Conduct test for other cylinders in the firing order of the engine

 Observe ignition sequence.

AR01.00-P-1300-03T

11

Install in the reverse order

Number

Designation

All engines

BE01.00-P-1001-02Z

Cylinder leakage: permissible loss total indication

%

25

BE01.00-P-1002-02Z

Cylinder leakage: permissible losses at valves and cylinder head gasket

%

10

BE01.00-P-1003-02Z

Cylinder leakage: permissible losses at pistons and piston rings

%

20