Check compression pressure

AR01.00-D-1201TSV

Check compression pressure

17.12.2018

Engine

642 in model 907

1

Compression pressure recorder

2

Adapter

3

Screw-in piece

X26/46x1

Engine wiring harness electrical connector 1

X4/43

Jump-start connection point electrical connector

 Danger

Risk of death. Death may occur if body parts are drawn into rotating vehicle parts.

Do not insert your hand into rotating parts. Wear closed and snug-fitting work clothes. Secure area of rotating vehicle components against unauthorized access.

AS00.00-Z-0004-01A

 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

 Danger

Risk of explosion caused by fuel igniting, risk of poisoning caused by inhaling and swallowing fuel as well as risk of injury to eyes and skin caused by contactwith fuel.

No fires, sparks, open flames or smoking. Pour fuels into suitable and appropriately marked containers only.
Wear protective clothing when handling fuel.

AS47.00-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 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

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A



Remove

1

Start engine and warm up to operating temperature.

 Operating temperature is reached at an oil temperature of approx. 80 °C.

 Only check compression pressure for an engine is at operating temperature.

2

Switch off ignition and store transmitter key outside of transmission range (min. 2  m).

3

Remove glow plugs.

AR15.20-D-4111TSV

Preparation

4

Disconnect engine wiring harness electrical connector 1 (X26/46x1).

5

Attach connection line (4) for the compression pressure recorder (1) to engine wiring harness electrical connector 1 (X26/46x1).

 To this end, insert suitable connection line at pin 8 (arrow).

 Electrical connection kit

*220589059900

6

Connect compression pressure recorder (1) to jump-start connection point electrical connector (X4/43).

 Compression tester

*001589762100

7

Crank engine with compression pressure recorder (1).

 To this end, connect connection line to compression pressure recorder (1).

 To remove combustion residues from the cylinders.

 Compression tester

*001589762100



Check

8

Manually screw screw-in piece (3) into respective glow plug hole.

 Screw-in fitting

*640589006300

9

Attach compression pressure recorder (1) with adapter (2) to screw-in piece (3).

 Compression tester

*001589782100

 Screw-in fitting

*640589006300

10

Check compression pressure.

 To this end, crank engine over the contact switch on compression pressure recorder (1).

 Turn engine through at least eight revolutions.

Installation tolerance or new value of compression pressure

*BE01.00-N-1001-04TS

Wear limit or limit value of compression pressure

*BE01.00-N-1002-04TS

Compression pressure, permissible difference between the cylinders

*BE01.00-N-1003-04TS

 Compression tester

*001589762100

If minimum compression pressure is not reached or the permissible difference between the individual cylinders is exceeded,



Check cylinder leakage.

AR01.00-D-1300TSV

11

Remove compression pressure recorder (1) with adapter (2) from screw-in piece (3).

 Change compression pressure recorder (1) over to next cylinder to be checked.

 Compression tester

*001589762100

 Screw-in fitting

*640589006300

12

Remove screw-in piece (3).

 Screw-in fitting

*640589006300

13

Perform check of additional cylinders in same manner.

Refinish

14

Remove compression pressure recorder (1) from jump-start connection point electrical connector (X4/43).

 Compression tester

*001589762100

15

Remove connection line from compression pressure recorder (1).

 Compression tester

*001589762100

 Electrical connection kit

*220589059900

16

Remove compression pressure recorder (1) from screw-in piece (3).

 Compression tester

*001589762100

 Screw-in fitting

*640589006300

17

Remove screw-in piece (3).

 Screw-in fitting

*640589006300

18

Connect engine wiring harness electrical connector 1 (X26/46x1).

 To do so, remove connection line.

 Electrical connection kit

*220589059900



Install

19

Install glow plugs.

AR15.20-D-4111TSV

Compression pressure

Number

Designation

Engine 642 in model 907

BE01.00-N-1001-04TS

Installation tolerance or new value of compression pressure

bar

23...30

Compression pressure

Number

Designation

Engine 642 in model 907

BE01.00-N-1002-04TS

Wear limit or limit value of compression pressure

bar

17

Compression pressure

Number

Designation

Engine 642 in model 907

BE01.00-N-1003-04TS

Compression pressure, permissible difference between the cylinders

bar

 3