Gilera 633721 Workshop Manual page 185

Nexus 500 euro 3
020434Y Oil pressure control fitting
AHEAD go to 3
3 - Check the system pressure with cold engine and medium - high speed.
Standard pressure < 6 bar
YES go to 4 NO go to 5
4 - Replace the damaged components.
5 - Check the working order of the adjustment by-pass (see "flywheel cover" chapter) and restore proper
sliding.
N.B.
STANDARD PRESSURES ARE OBTAINED USING OIL WITH THE PRESCRIBED VISCOSITY. A
HIGHER VISCOSITY CAUSES AN INCREASE OF THE SYSTEM PRESSURE.
1 - If oil consumption is above 250 g/1000 km on a run-in engine, proceed as follows.
AHEAD go to 2
2 - Check the presence of oil at the scavenge duct on the filter box.
YES go to 3 NO go to 4
3 - Check the one-way reed valve and the decantation chamber drainage hole.
YES go to 5 NO go to 4
4 - Check the thermal group seals (piston rings, valve guides and oil guards), see "Thermal group and
Timing system" chapter.
5 - Restore the valve or the drainage hole efficiency.
Oil pump
Removal
- Remove the closing plate of the oil pump housing
by loosening the 2 retaining screws with their
washers.
Engine
ENG - 185