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)+

L23/30H

Dismounting of Sleeve for Fuel Injector

1)Remove the snap ring by means of two screwdrivers.

2)The sleeve can now be driven out of the bore by use of a brass mandrel and a hammer.

Brass mandrel

Fig 1.

Inspection of Bore in Cylinder Head and Mounting of the Sleeve:

3) Clean and inspect the bore in the cylinder head. Any marks which could prevent mounting of the sleeve, should be gently smoothed.

4) Coat the sealing ring zone in the bore with grease or lub. oil.

Snap ring

O-ring

Sleeve

Loctite 572

Fig 2.

5)Install new sealing rings on the sleeve.

6)Coat the sealing surfaces on the sleeve with loctite 572.

7)Insert the sleeve in the bore.

8)Mount the snap ring.

08028-0D/H5250/94.08.12

L23/30H

Dismounting of Valve Seat Rings

When reconditioning of a valve seat ring no longer is possible due to dimensions exceeding the scrapping criteria, the seat ring has to be replaced.

Dismounting of a valve seat ring is carried out by means of a special extractor tool set comprising the components, see fig 1.

Dismounting of a Valve Seat Ring is Carried out According to the Following Procedure

1) By means of the guide pin (7) the guide disc (5) is led vertically through the valve seat ring. Then the guide disc (5) is lifted with the guide pin (7) until the latter is guided by the valve seat ring. The stud (1) is then screwed in until it rests in the valve guide.

Fig 1.

Fig 2.

2) The guide disc (3) is positioned so that it bears against the bottom of the cylinder head, and the hydraulic jack is clamped with the disc (4) and the collar nut hexagon (2), see fig 1. The hydraulic jack is the one used for main bearing caps.

08028-0D/H5250/94.08.12

3) By pumping up the pack, see working card 520-01.05 for the use of hydraulic tools, the valve seat is pressed out max. 6 mm, and the pressure is released again. The collar nut hexagon is tightened and the operation is continued until the valve seat ring can be removed.

Mounting of Valve Seat Rings

1)Prior to mounting of a new valve seat ring, the bore must be cleaned thoroughly and inspected for marks. Marks that can hinder mounting of the valve seat ring must be removed.

2)Tools for mounting of valve seat rings are shown in fig 3.

1

2

Fig 3.

3)To facilitate mounting the valve seat ring is it cooled down, however, a min. of -25°C otherwise, the o-ring can be damaged.

4)Place the o-ring on the valve seat ring and coat with oil/loctite as shown in fig 4, just before positioning it in the bore.

Coat with loctite 648

Valve seat ring

O-ring

Coat with oil

Fig 4.

5) The valve seat ring is positioned in the bore, the handle with stud is inserted as shown in fig 5, and the washer with screw is screwed tight.

Fig 5.

08028-0D/H5250/94.08.12

L23/30H

Check to be Done before Lifting

1)Check the jointing surfaces of the cylinder head/cylinder liner to see that they are clean and without damage marks, see working card 506-01.45. Fit new O-rings on the water passage, lubricate the O- rings with a little oil.

2)Check all contact faces on the cylinder head and nuts, including threads, and make sure that these are level and smooth and absolutely free from foreign particles.

Mounting of Cylinder Head

3) Attach the lifting tool, see fig 1, to the cylinder head that has been made ready for installation, and position it carefully on the cylinder liner.

Place the spacer ring around the nuts with the slot in such a position that the tommy bar can be used.

Tighten the hydraulic jacks and make sure that the cylinder of the jacks bears firmly against the spacer ring. Tighten up all the nuts, see page 500.40. For using the hydraulic tools, see working card 520-01.05.

7)If new studs or nuts have been fitted, the nuts

Fig 1.

Tightening of Cylinder Head Nuts

4)Make sure that the nuts run easily on the threads and that they bear on their entire contact surfaces.

5)Coat threads and contact faces with copaslip before fitting the nuts.

6)Screw nuts onto the studs and tighten lightly with the tommy bar.

Adjustment of Valve Clearance

8)Adjust the valve clearance, see working card 508-01.10.

9)Fit the pipes for fuel oil, lub. oil, cooling water and the flange for exhaust pipe.

Before Starting

10)Prior to starting up check for leakages. After starting up check for leakages and oil flow.

11)Mount the cover for rocker arm and the front cover for fuel pump.

08028-0D/H5250/94.08.12

08028-0D/H5250/94.08.12

L23/30H

280

135

147

015

159

111

338

160

172

184

196

184