Working Card |
Replacement of Valve Seat Ring |
505-01.35 |
Page 1 (4) |
Edition 01H |
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08028-0D/H5250/94.08.12
L23/30H
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:
Replacement of valve seat ring for inlet and exhaust valve.
Starting position: |
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Inlet and exhaust valves have been |
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removed |
505-01.05 |
Related procedure:
Mounting of valve spindles |
6505-01.05 |
Man power: |
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Working time |
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1 1/2 |
hours |
Capacity |
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1 |
man |
Data: |
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Data for pressure and tolerance |
(Page 500.35) |
Data for torque moment |
(Page 500.40) |
Declaration of weight |
(Page 500.45) |
Special tools: |
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Plate no |
Item no |
Note |
52021 |
011 |
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52021 |
501 |
1 piece |
52005 |
457 |
Extra tools |
52005 |
504 |
Extra tools |
52021 |
466 |
1 piece |
Hand tools:
Ring and open-end spanner, 36 mm Hammer.
Loctite, 648. Lub. oil.
Replacement and wearing parts:
Plate no |
Item no |
Qty. / |
50501 |
351 |
4/cyl. |
50501 |
064 |
2/cyl. |
50501 |
076 |
2/cyl. |
96.26 - ES0S
505-01.35 |
Replacement of Valve Seat Ring |
Working Card |
Edition 01H |
Page 2 (4) |
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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.
1 |
Stud |
6 |
Eye screw |
2 |
Collar nut hexagon |
7 |
Guide pin |
3 |
Guide disc |
8 |
Valve guide |
4 |
Disc |
9 |
Hydraulic jack |
5 |
Guide disc |
10 |
Valve seat ring |
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
96.26 - ESOS
Working Card |
Replacement of Valve Seat Ring |
505-01.35 |
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Page 3 (4) |
Edition 01H |
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L23/30H |
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
0D/H5250/94.08.12-08028 |
1 Handle |
2 Stud |
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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.
96.26 - ES0S
505-01.35 |
Replacement of Valve Seat Ring |
Working Card |
Edition 01H |
Page 4 (4) |
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L23/30H |
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6)By knocking on the handle and at the same time tightening the nut (4), the valve seat ring slides in place in the bore and it is felt on the knocks when it bears in the bore.
7)Prior to mounting of the valve spindle the valve seat ring must be ground, to ensure correct centering af the valve guide and the valve seat ring. This can be done according to working card 505-01.05 or 50501.10.
08028-0D/H5250/94.08.12
96.26 - ESOS