Inspecting The By-Pass Valve; Refitting The Oil Sump - Derbi GP1 125-250 c.c. Workshop Manual

- Remove the spring, the by-pass piston, the gasket and the
centring dowels shown in the second figure.
I I -
NSPECTING THE BY NSPECTING THE BY PASS VALVE PASS VALVE
- Check the free length of the spring.
- Check that the piston exhibits no scratches.
- Ensure that it slides freely on the crankcase and that it gua-
rantees a good seal.
- If not, eliminate any impurities or replace defective parts.
Characteristic
Check by-pass: Standard length
54.2 mm
R R
EFITTING THE OIL SUMP EFITTING THE OIL SUMP
-Replace the By-pass piston into its seat.
- Insert the adjustment spring.
- Install a new sump gasket.
- Replace the two centring dowels.
- Install the sump inserting the spring into the seat on the
sump.
- Replace the screws and the rear brake support pipe brac-
kets according to the removal reverse operations.
- Tighten the screws at the prescribed torque.
- Replace the driving pulley unit, the belt, the pinion and the
transmission cover as described in chapter «Transmissions».
- As regards the checks relating to connecting rod lubrication
troubles, see chapter «Crankcase and driving shaft».
Locking torques (N*m)
Oil pan screws 10 ÷ 14
146