APRILIA Atlantic 300 Service Station Manual page 152

Engine
FIT THE BELLEVILLE WASHER SO THAT ITS OUTER RIM
TOUCHES THE PULLEY. MAKE SURE THAT THE PUMP
TURNS FREELY.
Locking torques (N*m)
Screws fixing oil pump to crankcase 5÷6 (3.7÷4.4 ftlb) oil pump driving crown gear screw 10÷14
(7.4÷10.3 ftlb) Oil pump cover screws 7÷9 (5.2÷6.6 ftlb)
Removing the oil sump
- Remove the oil filler plug, the transmission cover,
the complete driving pulley assembly with belt and
sprocket wheel, as described in the Transmission
chapter.
- Drain the oil from the sump as described above.
- Remove the 7 screws, shown in the figure, and
the 2 brackets fixing the rear brake fluid pipe.
- Remove the spring, the by-pass piston, the gas-
ket and the centring dowels shown in the figure.
Inspecting the by-pass valve
- Check the free length of the spring.
- Check that the plunger is not scored.
- Make sure that it slides freely on the crankcase
and that it guarantees a good seal.
- Otherwise, eliminate any impurities or replace
defective parts.
Characteristic
By-pass check: Standard length
54.2 mm
ENG - 152
ATLANTIC 300 i.e.