ar0100w1200ca

Test compression pressure

Type ar · topic 01.00 · version 0302 · 2019-09-24

Applies to: Engine 457.9## ## as of 065487 in model 374, 375, 940, 942, 943, 944

Where it sits

Function group 1 Engine › 01 Complete engine, crankcase ventilation, cylinder head, crankcase › 01.00 General — Series 374 · Series 375 · Series 940 · Series 942 · Series 943 · Series 944

EinPAS 15 Engine › 15.15 Combustion engine, complete/engine housing/crank assembly › 15.15.15 internal combustion engine, complete — Series 374 · Series 375 · Series 940 · Series 942 · Series 943 · Series 944

Also applies to engines/gearboxes: 457 9**

AR01.00-W-1200CA

Test compression pressure

09.09.2019

Engine

457.9## ## as of 065487 in model 374, 375, 940, 942, 943, 944

Modification notes

14.01.2016

Note on calculating tightening torque when using insertion tool with various effective lengths.

Operation steps 9

AH00.00-P-0015-01CW

07.01.2016

Fuel return line tightening torque (for compression test) to unit pump, added.

Step 9

BA07.15-N-1008-01G

Test compression pressure

1

Compression pressure recorder

2

Fuel return line (self fabricated)

S10.1

Engine start/stop button

W01.00-1070-05

Test compression pressure

1

Compression pressure recorder

3

Connector

4

Retaining clip

5

Screw

6

Elbow fitting

7

Diagram chart

W01.00-1059-06

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 caused by body parts being pinched or crushed as cab is tilted

Ensure that no one is within the tilting range of the cab as it is being tilted. Always tilt the cab all the way to the end position and secure it with the safety strut.

AS60.80-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

Topical note

Notes on tilting the cab

AH60.80-N-0003-01A

Remove

1

Start engine and bring to normal operating temperature then switch off engine

Coolant temperature about 70 to 95°C.

2

Switch off ignition

3

Tilt cab

4

Remove Engine start/engine stop button (S10.1) on charge air distributor and tie on

Do not disconnect engine start button/engine stop button (S10.1) from electrical engine wiring harness.

5

Remove charge air distributor

AR09.41-W-8681D

6

Remove cylinder head covers

AR01.20-W-5014C

7

Remove injection lines

AR07.15-W-9235C

8

Remove nozzle holder combinations

AR07.03-W-6831D

9

Attach fuel return line (2) to unit pumps

AR07.15-W-2000-06C

Note on calculation of tightening torque when using insertion or socket tools with various effective lengths

AH00.00-P-0015-01CW

Fuel return line of unit pumps for compression test

WF58.50-W-0700-02A

Fuel return line (for compression pressure test) to unit pump

*BA07.15-N-1008-01G

Box wrench bit

*000589680300

Clamp

*000589403700

10

Switch on ignition

Only if not all cylinders are checked.

After switching off the ignition or the disconnecting in the meantime the diagnostic system, the unit pump actuation is activated again and then the engine can start.

11

Attach diagnostic system and switch off actuation of unit pumps

Only if not all cylinders are checked.

Switching off the unit pump actuation using the diagnostic system means that the engine will not start.

12

Press Engine start/engine stop button (S10.1) and crank engine with starter a number of times

Check

13

Install connector (3) with sealing sleeve in the protective sleeve and clamp tight with tensioning clamp (4)

To clamp tightly screw down tensioning clamp (4) tight using a suitable screw/bolt (5).

Bolt, retaining clip, nozzle holder combination and constant throttle to cylinder head

*BA07.15-N-1006-01G

Connector

*904589012100

14

Attach compression recorder (1) and elbow fitting (6) to the connector (3) and insert diagram chart (7) or push on

Compression tester

*001589782100

15

Press Engine start/engine stop button (S10.1) and crank engine with starter at least 8 revolutions

The measurements are written on the diagram sheet (7).

16

Remove retaining clamp (4) and connector (3) from protective sleeve

Pull sealing sleeve out of the protective sleeve with the puller.

Extraction tool

*906589026300

17

Check remaining cylinders in the same way

18

Compare measured values in recording chart (7) with permitted values

If a variation from specified value exists, determine the cause and rectify fault.

Compression pressure wear limit or limit value for cranking speed

*BE01.00-N-1001-01B

Compression pressure: permissible difference between individual cylinders

*BE01.00-N-1002-01B

Install

19

Remove fuel return line (2) at unit pumps

AR07.15-W-2000-06C

Box wrench bit

*000589680300

20

Install nozzle holder combinations

AR07.03-W-6831D

21

Install injection lines

AR07.15-W-9235C

22

Install cylinder head covers

AR01.20-W-5014C

23

Install charge air distributor

AR09.41-W-8681D

24

Attach engine start button/engine stop button (S10.1) to charge air distributor

Engine start/stop button on charge air manifold

*BA15.00-N-1001-01C

25

Tilt back cab

26

Clear fault memory using the diagnostic system

Check values for compression pressure

Number

Designation

Engine 457.9

BE01.00-N-1001-01B

Compression pressure wear limit or limit value for cranking speed

bar

28

Check values for compression pressure

Number

Designation

Engine 457.9

BE01.00-N-1002-01B

Compression pressure: permissible difference between individual cylinders

bar

4

Diesel injection system with unit pumps (MR)

Number

Designation

Engine 457.9

BA07.15-N-1006-01G

Bolt, retaining clip, nozzle holder combination and constant throttle to cylinder head

Nm

50

Diesel injection system with unit pumps (MR)

Number

Designation

Engine 457.9

BA07.15-N-1008-01G

Fuel return line (for compression pressure test) to unit pump

Nm

30

Engine electrical system, general

Number

Designation

Engine 457

BA15.00-N-1001-01C

Engine start/stop button on charge air manifold

Nm

25

Test compression pressure
Test compression pressure
Test compression pressure
Test compression pressure

001 589 78 21 00

Compression tester

904 589 01 21 00

Connector

000 589 68 03 00

Box wrench bit

906 589 02 63 00

Extraction tool

Test compression pressure

000 589 40 37 00

Clamp

Referenced documents