WinGD WARTSILA RT-flex58T-D, Maintenance Manual

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Maintenance
2728 − 1/A1
RT-flex58T-D
Winterthur Gas & Diesel Ltd.
2/ 3
⇒ Loosen self-locking nut 7 with a socket spanner, and remove it.
⇒
Pull piston 8 and compression spring 11 from the casing.
⇒ Lift casing 4 up over valve spindle 9.
4. Grinding-in
D Slightly damaged seat faces may be ground in (lapped) manually.
D Badly worn seat faces must first be machined and then ground in (lapped)
manually.
Remark: The valve spindle has an angle of 61 _ , however, the valve seat angle
amounts to 60
_
.
5. Assembling
Assemble the valve in reverse sequence to the dismantling.
⇒ Clean all parts and smear them lightly with oil.
⇒ Apply MOLYKOTE paste G to the thread of spindle 9 and tighten self-locking
nut 7 with
225 Nm or by a tightening angle of 50
_
.
The spindle thread in the region of the locking ring of self-locking nut 7 must not be
lubricated.
⇒
Place new O-rings 5 and 15 in the groove in the valve casing and connecting
pipe 14 respectively, and oil lightly.
After completing the assembly (without cover 2) check the easy movement of the
spindle by moderately tapping the upper end of the spindle several times with a
lead block in an axial direction; the spindle must jump every time back on the seat.
If the valve seat have been ground/machined several times, check clearance ’x’
(see figure) with a depth gauge from the upper edge of intermediate ring 3 onto
piston 8.
Clearance ’x’ must be minimum 1 mm.
⇒ Fit cover 2 and tighten it with Allen screws 10. Take care that transfer sleeve
14 does not interfere when assembling cover 2.
6. Fitting in the cylinder cover
⇒
Place a new joint ring 12 on the shoulder of the bore in the cylinder cover.
⇒ Smear bore in cylinder cover lightly with oil and fit the assembled starting air
valve.
⇒
Apply Never-Seez NSBT-8 to the threads of nuts 1, fit and tighten them cross-
wise through an angle of
110 _ .
Starting Air Valve: Removal, Fitting and Dismantling, Grinding-in and Assembling
2013
CHECK