Check compressor for oil ejection

AR13.30-G-0005DD

Check compressor for oil ejection

15.08.2019

Engine

900.91/92 in model 000.001

Engine

902.91/93 in model 000.001

Engine

904.94/95/96/97 in model 000.001

Engine

906.90/93/94/95/96/98/99 in model 000.001

Engine

924.91/93/94 in model 000.001

Engine

925.9 in model 000.001

Engine

926.91/92/93/95/97/98 in model 000.001

Shown on engine 902.9 with a 1-cylinder air compressor

1

Air compressor

2.2

Check-compressed air hose

6

Pressure gage

2

Fitting (working connection)

3

Oil ejection test equipment (adapter)

7

Test kit

2.1

Air line (operating line)

5

Measuring hose

11

Test sheet

3

Oil ejection test equipment (adapter)

8

Cable tie

9

Lever

10

Compressed air outlet

11

Test sheet

Oil ejection normal - the diagnostic findings are visibly black but perceptibly dry

A

60 mm

Oil ejection too high - the diagnostic findings are visibly black but perceptibly wet

A

60 mm

 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

 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

 Danger

Risk of explosion due to escaping combustible gas or overheating of gas cylinders.Risk of injury caused by burns to skin and eyes. Risk of frostbite to body parts caused by escaping gas and by touching components near the valves when emptying gas cylinders. Risk of poisoning or suffocation caused by inhaling gas.

Remove any sources of ignition.
Protective clothing, safety gloves and safety glasses must always be worn.
Ensure that the work area is adequately ventilated.
When working on vehicles at ambient temperatures over 60 °C, all gas cylinders must be removed.

AS00.00-Z-0018-01A

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

AH00.00-P-0015-01CW

Notes on oil consumption/oil loss with compressors

AH13.30-N-1000-01B

Notes on work safety regulations for vehicles with natural gas-powered engines

AH00.10-N-1000-04A



Remove

1

Start engine and bring to operating temperature, then switch off engine.

 See information from body manufacturer.
Coolant temperature approx. 70 to 95°C.

2

Switch on ignition.

 See information from body manufacturer.

3

Remove air intake line from air compressor (1).

 This ensures that the air compressor (1) suctions only oil-free air.

4

Remove compressed-air line (2.1) at fitting (2).

5

Remove control line from air compressor (1).

Only for vehicles with a control line on air compressor (1).

 By taking this measure one can ensure that the air compressor (1) is also in the delivery phase if the output of the compressor is impaired by another defective, on the pressure regulator.

6

Prepare test sheet (11) for the oil ejection check on air compressor (1).



WF58.50-W-1330-03A

7

Attach test compressed air hose (2.2) for oil ejection test equipment (3) to fitting (2) on air compressor (1).

 Adapter

*000589039000

8

Fasten oil ejection test equipment (3) using a cable tie (8) to a suitable, stable point.

9

Attach test kit (7) with measuring hose (5) to oil ejection test equipment (3).

 Test kit

*360589002100

10

Fully open compressed air outlet (10) of oil ejection test equipment (3) by turning lever (9).


Always ensure that the compressed air outlet (10) is fully opened before starting the engine so that the back pressure is at a minimum.
Oil ejection test equipment (3) can be damaged otherwise.

11

Start engine and increase the speed from idle speed to maximum governed rpm using the engine start/stop button.



Check

12

Turn lever (9) until the required back pressure is set on manometer (6).


The oil ejection check must always take place with the required back pressure.
A false result will result otherwise.

Oil ejection test (with oil ejection test equipment and test kit)

*BE13.30-N-1003-01O

13

Check air compressor (1) with the prepared test sheet (11) for oil ejection


During the checking, ensure that no foreign objects are sucked in over the suction connection.
Consequential damage can occur at the air compressor (1) otherwise.

 While the engine runs with maximum governed rpm, hold the test sheet (11) at a 10 cm distance in front of the compressed air output (10).

 Observe the test duration.

Oil ejection test (with oil ejection test equipment and test kit)

*BE13.30-N-1003-01O

14

Switch off engine.

15

Compare test sheet (11) with diagnostic findings for oil discharge to assess the oil discharge.

AR13.30-G-5510DD

If oil discharge is too high,



Replace air compressor (1).

16

Remove oil ejection test equipment (3) and test kit (7) from air compressor (1).

17

Check compressed-air line (2.1) for carbonization.

 In the event of carbonization, also check the compressed-air lines between air compressor (1) and the compressed air drier; replace carbonized parts if necessary.



Install

18

Install compressed-air line (2.1) at fitting (2).

 Union nut, compressed air line to fitting

*BA13.30-N-1010-01H

19

Attach control line to air compressor (1).

Only for vehicles with a control line on air compressor (1).

20

Attach air intake line to air compressor (1).

21

Start engine and run at idle speed.

 See information from body manufacturer.

22

Check the line interfaces on air compressor (1) for leak tightness.

 Perform visual inspection.

23

Switch off engine.

24

Print out questionnaire and fully fill in.

Only if the compressor (1) was replaced and if the cost acceptance was applied for as part of the warranty and goodwill.



Questionnaire for checking delivery rate and oil ejection of compressor, form

OF13.30-W-1000-02A

 For a warranty or goodwill claim the removed compressor (1) must be submitted for inspection together with the completely filled out questionnaire and the test sheet used when testing for oil ejection.

Check values for air compressor

Number

Designation

Engine 900.9, 902.9, 904.9, 906.9, 924.9, 925.9, 926.9 in model 000.001

BE13.30-N-1003-01O

Oil ejection test (with oil ejection test equipment and test kit)

Back pressure to be set

bar

5

Test duration

min

1

 Compressor (compressed air system)

Number

Designation

Engine 900.9, 902.9, 904.9, 906.9

Engine 924.9, 925.9, 926.9 in model 000.001

BA13.30-N-1010-01H

Union nut, compressed air line to fitting

M22x1.5

Nm

65

65

M26x1.5

Nm

75

75