Wartsila RT-flex50-D - Checking the Valve Seat

Maintenance
2751−3/A1
RT-flex50-D
Wärtsilä Switzerland Ltd
5/ 5
5. Checking the valve seat
After grinding it is necessary to check whether the new
or
re-ground valve makes correct contact with the valv
e
seat. For this the spindle head seat face is spread with
a
thin coating of blueing paste, then inserted vertically in
to
the valve guide bush.
Remark: The angle difference is chosen such that in th
e
hot operating condition the valves makes contact b
y
50−100% from the outer edge (Fig. ’F’). The bluein
g
check should show that the cold valve makes conta
ct
only from inside around the whole circumference. Th
e
angle difference can be checked at gap ’S’ on the out
er
edge with a feeler gauge (Fig. ’G’).
⇒ The blueing on the valve seat must be checked b
y
tapping the valve head three or four times with
a
hammer on a wooden block! (Fig. ’E’).
Do not rotate the valve spindle on the valve se
at
face, as this risks seizure of the seating.
CHECK
F
G
30
2’
+
0
_
HARC
E
50−100%
003.455/00
003.456/00
003.457/00
S = 0.029 − 0.048 mm
Exhaust Valve: Replacing and Grinding the Valve Seat
2010