Test compression pressure

AR01.00-P-1200M

Test compression pressure

17.1.08

30.4.03

Risk caused by contusions and burns from working on the vehicle as it is being started or when the engine is running, safety note added

30.4.03

Risk to skin and eyes from handling hot or glowing objects, safety note added

30.4.03

Connect compression recorder, added

Step 8.1

30.4.03

Crank engine with starter, added

Step 9.1

 

Remove/install

 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 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

1

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

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

2

Switch off engine and turn the key in the EIS [EZS] control unit into position "0"

 Vehicles with Keyless-Go Code 889: press Start/Stop button repeatedly until ignition is switched off.

3.1

Remove charge air distribution pipe trim panel (1) and cover of cylinder head cover (2)

Engine 613

AR01.20-P-5014-02C



*BA01.20-P-1002-01A



*BA01.20-P-1003-01A

3.2

Remove air filter housing (6)

Engine 628.960

AR09.10-P-1050M

Engine 628.962

AR09.10-P-1050GD

Engine 628.963

3.3

Detach intake air distribution pipe

Engine 628.963

AR09.10-P-1250CD

4

Disconnect electrical connector at pressure regulator valve (Y74)

 Prevents injection of fuel.

5

Remove glow plugs (R9)

AR15.20-P-4111HB

6

Screw in screw-in fitting (5) into the glow plug hole of the cylinder to be tested



*611589016300

Checking

7

Connect compression recorder (3) to screw-in fitting (5)

 Engine 613: Use flexible connection piece (4).



*001589762100

8.1

Connect compression recorder

Model 220.028/128

AR01.10-P-0010-01L

8.2

Connect STAR DIAGNOSIS to the data link connector

Except model 220.028/128



AD00.00-P-2000-04A

9.1

Crank engine with starter

Model 220.028/128

AR01.10-P-0110MD

Do not crank the engine using the key in the EIS [EZS] control unit, use the contact switch of the compression recorder (3) instead.

9.2

Interrogate compression pressure with STAR DIAGNOSIS

Except model 220.028/128

Crank engine with STAR DIAGNOSIS and read the test value on the compression recorder.

10

Carry out test procedure at remaining cylinders in the same way

11

Compare pressure readings obtained with specified pressures

Compression installation tolerance or new value

*BE01.00-P-1001-01A

Compression pressure wear limit or limit value

*BE01.00-P-1002-01A

Compression pressure permissible difference between individual cylinders

*BE01.00-P-1003-01A

If pressure measured is less than minimum compression pressure or if permissible difference between individual cylinders is exceeded:

Check cylinders for leaks

AR01.00-P-1300HC

12

Install in the reverse order

13

Read out fault memory with STAR DIAGNOSIS

Number

Designation

Engine
613.960/961

Engine 628.960/961/962/963

BE01.00-P-1001-01A

Compression installation tolerance or new value

bar

29...35

29...35

BE01.00-P-1002-01A

Compression pressure wear limit or limit value

bar

18

18

BE01.00-P-1003-01A

Compression pressure permissible difference between individual cylinders

bar

3

3

Number

Designation

Engine 613.960/
961

BA01.20-P-1002-01A

Bolt, trim panel of cylinder head cover to cylinder head cover

Nm

10

BA01.20-P-1003-01A

Bolt, charge air distribution pipe cover to charge air manifold

Nm

10