WÄRTSILÄ RT-flex50-D, Maintenance Manual

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Maintenance
5562−2/A1
RT-flex50-D
Wärtsilä Switzerland Ltd
1/ 2
Tools: Key to Illustrations:
1 OBEL test bench 94272 1 Valve housing 11 Fuel overpressure
1 Valve holder 94272a 2 Valve needle safety valve 3.52
1 HP oil pump 94931 3 Ball 12 Receiver
2 Hydr. distributors 94934a 4 Spring carrier 13 Back-up ring
2 HP hoses 94935 5 Disc spring (11 pieces) 14 O-ring
6 Stop ring
7 Distance ring
8 Seating washer
AB Drain bore
9 Snap ring EV Relief valve
10 Screw plug MK Marking
∅
3 mm
1. General
A relief valve normally requires no maintenance, however the opening pressure
and the tightness should be checked according to Maintenance Schedule
0380−1 .
Leaky or faulty valves have to be returned to the manufacturer or to a Wärtsilä
Switzerland Ltd. authorized repair workshop for inspection and repair.
The opening pressure of the relief valve must be approved by IACS (International
Association of Classification Societies) and recorded on the Inspection Report.
Remark: To identify the new fuel overpressure safety valve (relief valve) 11, two
bores ’MK’ on one face have been provided as a marking.
A
015.499/07
AB
5
3
4
8 14 13 6 7
1 2
9 MK
OPENING PRESSURE
STAMPED IN
AF41
AF80
10
2. Checking
In order to properly loosen the relief valve from the fuel accumulator, a spanner
AF80 must be used and placed on housing 1!
Test bench 94272 as well as test & calibration fluid has to be used (e.g. Shell Cal-
ibration Fluid S.9365) complying with the data according to the following table:
2.1 Physical characteristics for test & calibration fluid
Kinematic Viscosity ASTM D445
at 40
_
C
mm
2
/s 2.6
Density at 15
_
C kg/m
3
ISO 12185 827
Pour Point
_
C ISO 3016 −27
Fuel Overpressure Safety Valve
Checking and Setting
2010