Maintenance3403−3/A1
RT-flex58T-D
Winterthur Gas & Diesel Ltd.
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3. Assembling of a piston
For assembling the piston the following points must be observed:
D Damaged spraying nozzles 2a may under no circumstances be reused. New
ones must be fitted with liquid securing agent LOCTITE No. 0648.
D Whenever possible always use new O-rings, they must conform in dimen-
sions and quality to our specifications.
D All cylindrical guide portions as well as O-rings, screw head seatings and
threads of the elastic screws must be smeared with oil before fitting.
Pre-tighten oiled screws 12 with 10 Nm using a torque wrench, subsequently tigh-
ten to an angle of 30_ and finally secure them with locking plates. No additional
lubricant must be applied to the threads of screws 12.
D Attention must be paid to locating pin 10 when assembling piston skirt 7 with
piston rod 6.
⇒ Insert and tighten both screws 9.
D For the assembly of piston crown 1 to piston rod 6 make sure that two center-
ing pins 8 (Fig. ’A’), serving also as guides, mate with the corresponding bores
in piston skirt 7 and the piston rod.
⇒ Screw all oiled elastic screws 5 into the well cleaned threaded holes until fully
seated; tighten these carefully crosswise in small steps with ring impact span-
ner.
⇒ Mark position of screw heads against piston rod flange with felt marker (= ini-
tial position).
Using an impact ring spanner and a hammer, tighten the elastic screws crosswise
in small steps until these have been turned by an angle of 90_ compared with the
initial position (see 0352−1).
⇒ Lock all elastic screws 5 with their locking elements 3. For fitting a locking ele-
ment a screw may under no circumstances be turned back; it must instead
be tightened further (by max. 5_).
Piston: Dismantling and Assembling
2013
CHECK
CHECK
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