Testing compression pressure

AR01.00-T-1200A

Testing compression pressure

14.12.98

 Danger

Risk of accident as a result of vehicle starting off when engine running. Risk of injury as a result of bruises and burns if you insert your hands into engine when it is being started or when it is running.

Secure vehicle to prevent it starting off.

Wear closed and close-fitting work clothes.

Do not grasp hot or rotating parts.

AS00.00-Z-0005-01A

 Danger

Risk of explosion from ignition. Risk of poisoning from inhaling and swallowing fuel. Risk of injury as a result of fuel coming into contact with skin and eyes.

No fire, naked flame or smoking.

Pour fuels only into suitable and appropriately marked containers.

Wear protective clothing when handling fuel.

AS47.00-Z-0001-01A

 

Removing, installing

1

Open service flap at rear left

2

Adjust valve clearance

 See maintenance manual

3

Warm engine up to operating temperature

 Operating temperature at least 80 °C

4

Remove injection nozzle with nozzle holder

 It is only possible for the starter to reach the specified engine speed (250 - 280 rpm) if all the injection nozzles are removed

AR07.03-T-6840A

5

Connect compression pressure recorder

AR01.10-T-0010-01A



*BA07.03-N-1004-01A



*000589642100



*403589040700



*001589782100



*403589002100



Testing

6

Test compression pressure

 Conduct test with injection pump fully switched off.

 Crank engine at starter speed long enough until the pointer no longer rises.

 Wear limit or limit value

*BE01.00-N-1001-01C

 Permissible difference between individual cylinders

*BE01.00-N-1002-01C

7

Install in the reverse order

Number

Designation

Engine 447

Engine 489

BE01.00-N-1001-01C

Wear limit or limit value

bar

20

20

BE01.00-N-1002-01C

Permissible difference between individual cylinders

bar

4

4

Number

Designation

Engine 447

Engine 489

BA07.03-N-1004-01A

Thrust bolt to nozzle holder

Nm

70

70