Winterthur Gas X35-B, Maintenance Manual

Page: 199 / 547

Maintenance
2751 − 2/A1
Winterthur Gas & Diesel Ltd.
5/ 9
3. Exhaust Valve − Assemble
Assembling is carried out analogously to dismantling but in reverse sequence.
1) Check the dimensions of the valve spindle (11,
Fig. 1 ) with 0330 − 1 Clearance
Table − Exhaust Valve.
The condition of piston seal ring (5, Fig. 2) is to be examined on every occasion, at the
latest, however, on the occasion of an overhaul of the exhaust valve according to the
maintenance schedule. A damaged piston seal ring must be replaced in any case.
CAUTION
Damage Hazard: Heat the new piston seal rings in boiling water
before fitting them. When fitting proceed with care, to avoid their
damage; do not use any sharp edged utensils for assistance.
2) Check all O-rings of the dismantled parts for damage and replace them if
necessary.
Note: If an exhaust valve is to be fitted with a new seat or spindle, the seats must
be checked according to the instructions given in 2751 − 3 .
3.1 Guide Bush − Installation
1) Clean the bore in valve cage (1, Fig. 4 ) and guide bush (15).
2) Oil the guide bush and press it into the valve cage using jack screws (94263).
3.2 Valve Spindle − Installation
1) Apply oil to the valve spindle and fit it.
2) Apply oil to a new rod seal ring (17,
Fig. 3 ), fit it with distance ring (16) and tighten
the latter with head screws (18).
Note: Always fit rod seal ring and distance ring only after fitting the valve spindle,
otherwise the rod seal ring might be damaged.
3.3 Valve Drive − Assemble
1) Bring the valve cage to vertical position.
2) Apply oil to all cleaned parts before fitting them.
3) Push the valve spindle (11,
Fig. 2 ) against valve seat (10) and fit disc springs (14) as
shown.
4) Fit the piston (4), valve cotters (6) and circlip (7).
5) Carefully fit valve drive housing (2) with a new O-ring (33) and position it by means
of dowel pin (31).
6) Fit and tighten head bolts (3, Fig. 2).
Exhaust Valve: Disassemble and Assemble
2017