
Maintenance
2140
−
1/A1
Winterthur Gas & Diesel Ltd.
6.
Valve Seat
−
Lap
1) Remove the spring (5,
), refer to
paragraph
2) Attach the handle (94214A) to the valve
spindle (3,
) as shown.
3) Apply lubricating oil to the valve
spindle (3).
4) Put the valve spindle (3) into the valve
guide (4).
5) Use oil based lapping paste and a corn
size of between 0.5 microns to 4.0
microns.
6) Lap the valve seat.
7) Do the pressure test again. If the
leakage is unsatisfactory, replace the
valve spindle and valve guide.
7.
Checks
After disassembly of the GAV, do the checks that follow:
7.1
Visual Check
Do the checks on the:
D
Valve seat for damage, unwanted material or corrosion (use engineers blue)
D
Valve stem and valve guide for hard running marks
D
Valve cotters for damage or cracks
D
Compression spring for fretting or cracks
D
O-rings in the housing for damage from disassembly
D
Valve spindle for scratches or other damage (use engineers blue)
D
Soft metal sealing i.e fluted seal ring in the nozzle for damage or corrosion
D
Nozzle for corrosion or particles
D
Servo piston for hard running marks
D
Servo housing for hard running marks
D
Orifice for dirt
D
Membrane and plug of the valve stroke sensor
D
O-rings on the rail valve and the compensator flange couplings
Note: If you find damage, the related part must be replaced. Speak to, or send a
message to Wärtsilä Services Switzerland Ltd. for more data.
Gas Admission Valve: Removal, Disassemble, Assemble, Checks, Installation
2016
94214E
94214A
3
4
WCH03394
Fig. 6
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