Derbi GPR 125 Racing, Workshop Manual

Page: 143 / 247

4 - ENGINE
143
(CONTINUES FROM POINT 55)
56. Fit:
- The front timing chain roller (81).
- The cylinder head gasket (82) (new gasket).
- The coolant pipe (83).
REMEMBER TO FIT THE FRONT
CHAIN ROLLER BEFORE FIT-
TING THE CYLINDER HEAD.
57. Fit:
- The cylinder head (84).
TIE A PIECE OF WIRE TO THE
TIMING CHAIN TO PREVENT
IT FROM DROPPING INTO THE
ENGINE.
APPLY OIL TO THE WASHERS
OF THE 4 BOLTS JOINING
THE CYLINDER HEAD TO THE
CRANKCASE.
58. Fit:
- The washers (85) impregnated with engine oil onto the M8 bolts (86).
- The 4 M8 bolts (86) securing the cylinder head to the crankcase.
- The 2 M6 bolts (87) securing the cylinder head to the crankcase.
Bolts securing the cylinder head to the crankcase.
Bolts M8 - 2,7 kgf.m + 90º (27 N.m + 90º)
Bolts M6 - 1,1-1,3 kgf.m (11-13 N.m)
TIGHTEN THE M8 BOLTS FIRST.
TIGHTEN THE CYLINDER HEAD BOLTS IN SUCCESSION CROSSWISE, GOING
FROM ONE TO THE OTHER TWO OR THREE TIMES.
AFTER TIGHTENING THE M8 BOLTS TO THEIR INDICATED TORQUE, THEY
SHOULD BE TURNED ANOTHER 90º (1/4 OF A TURN).
CAUTION
CAUTION
82
81
83
85 86
84
87
N.B.
N.B.
N.B.