7 семестр (Бормотов А) / 1man_bw_l23_30_chn_23_30_instruktsiya_po_ekspluatatsii / MAN-BW L23-30 (ЧН 225_300)+ / MAN-BW L23-30 H Vol-1 (Instruction)+

08028-0D/H5250/94.08.12

Description:

Functional test and adjustment of overspeed trip.

Hand tools:

Allen key, 4 mm.

Allen key, 2 mm.

Starting position:

Functional test and adjustment of safety

Related procedure:

1) The engine is run up manually, (on governor "synchronizer") and at no load, while watching the tachometer.

On reaching the revolution number indicated on page 500.30 or in "Test Report", the overspeed tripping devicemustfunction,thusactuatingthestopcylinders. The fuel injection pump control rods are now moved to zero index, and the engine stops.

2) If the overspeed device trip at a revolution number different from that stated on page 500.30 or in the "Test Report" the overspeed device must be adjusted.

Turn the engine until the adjusting screw is opposite the opening on the side of the housing. Now loosen the lock screw and turn the adjusting screw, using the tubular pin spanner supplied, see fig 2.

Fig 1.

Adjustment of Overspeed Trip.

3) Remove both covers on the housing of the overspeed tripping device, see fig 1.

Fig 2.

Turn the adjusting screw outwards (slacken flyweight spring) to reduce the revolution number. Be careful not to screw the adjusting screw so far out that it may touch the release arm. Tighten the lock screw and test the overspeed device again.

4)Refit the covers when the overspeed device functions at correct revolution number.

5)The overspeed device can be tested manually by depressing the button on top af the housing, see fig 1. This will activate the flyweight and the arm for release of the air valve for the stop cylinders and the engine should thus stop. (This test must also be carried out without load).

6)It is recommended now and then, while the engine is at a standstill, to move the flyweight by means of the push button to ensure that the flyweight can always move with sufficient ease.

08028-0D/H5250/94.08.12

08028-0D/H5250/94.08.12

Starting position:

Functional test and adjustment of safety

Related procedure:

L23/30H

The level switch LAL 25, which is mounted on the main lubricating oil pipe of the engine, gives alarm for missing prelubricating oil.

Function.

1)By starting the prelubricating oil pump the main lubricating oil pipe will be filled with lubricating oil, which means that the level switch is lifted and the alarm is disconnected.

2)When the prelubricating is interrupted, the lub. oil will run out of the system through the bearings, which means that level switch is lowered and the alarm starts.

Vent pipe

Level switch

Main lubricating oil pipe

Fig 1.

08028-0D/H5250/94.08.12

L23/30H

The pressure transmitter registers the actual pressure and marks the change to an electrical signal, which adjusts the pressure.

1.Trial flange.

2.Drain screw.

3.Valve.

Fig 1.

Adjustment:

1) The pressure transmitter shall not be adjusted, but the alarm limit must be set on the alarm plant. Kindly see the instruction book for the alarm plant.

Set points, see page 500.30.

Test:

2)It is possible to make a functional test of the pressure transmitter. This is carried out according to the following procedure:

3)Shut off system pressure with the valve pos. 3.

4)Remove the screw pos. 2.

5)Mount the testing apparatus on the trial flange pos. 1. and pump on a pressure within the working area of the transmitter.

If the alarm plant has an instrument unit, the pressure can be read on this. Other wise the test can be carried out by watching if the alarm plant gives any alarm, when the alarm limit which is stated on page 500.30 is exceeded (if the alarm plant is adjusted).

6) The screw pos. 2 is mounted, and the valve pos. 3. is opened after the test is finished.

08028-0D/H5250/94.08.12

The PT 100 sensor consists of a resistance wire which changes resistance depending on the temperature.

Look and design varify depending on the place of measurement and manufacture.

Adjustment:

1) The PT 100 sensor cannot be adjusted, but the alarm limit must be set on the alarm plant.

Set point, see page 500.30.

Test:

2)The functional trial of the PT 100 sensor can be carried out according to the following procedure.

3)Take out the sensor of the pocket.

4)Test the sensor by diving the sensor in the water. Compare the signal from the sensor with the water temperature.

If the alarm plant has an instrument unit, the temperature can be read on this.

Otherwise the test can be carried out by watching if the alarm plant gives any alarm, when the alarm limit which is stated on page 500.30 is exceeded (if the alarm plant is adjusted).

5)The sensor is mounted again.

Fig 1.

08028-0D/H5250/94.08.12

Safety precautions

Stopped engine

Shut off starting air

Shut off cooling water

Shut off fuel oil

Shut off cooling oil

Stopped lub. oil circul.

Description

Adjustment of lambda controller.

Starting position

Related procedure

Manpower

Data

Special tools

Hand tools

Adjustable spanner 10"-12"

Replacement and wearing parts

L23/30H

Adjustment of the Lambda Controller

All adjustments are made when the engine is in standstill position.

1)Check that the free space between the pickup and the band steel on the regulating arm is min. 1 mm, see fig 1.

Fig 1 Check of free space

Fig 2 Adjustment of the stop screw

Fig 3 Lambda Controller

2)Turn the lever (fig 2) of the governor a few times to full load with an adjustable spanner (spring between governor and fuel rack full com-pressed). Check that the fuel index is 17 at the fuel pump.

3)In case of large deviation from index 17 adjustment is done by turning the regulating arm (4), fig 3. Finally adjustment is done at the adjustment screw (3), fig 3.

4)Adjustment completed.

Adjustment of the Stop Screw

5)Remove pipe for charge air pressure.

6)Supply air pressure until the piston rod reaches its upper position.

7)Turn the lever (fig 2) of the governor to full load with an adjustable spanner. Adjust the stop screw (fig 2) to 110 % load (stationary 100%) according to the test bed, plus 1.5 index.

08028-0D/H5250/94.08.12