Komatsu PC88MR-10 Shop Manual page 1052

50 Disassembly and assembly
Engine and cooling system
2. Cylinder head assembly
1) Tighten injector harness (22) with nut (23).
Lock nut (23):
2.0 to 2.4 Nm {0.20 to 0.24 kgm}
a Be careful that the injector harness is not
pinched by the tool and rocker housing.
a Installing position of injector wiring
harness
Color of injector wiring
harness
White
Black
2) Tighten cylinder head cover (21) with
mounting bolt (20).
Mounting bolt (20):
7.8 to 9.8 Nm {0.8 to 1.0 kgm}
3. Fuel high-pressure pipe
50-24
Cylinder No.
1, 3
2, 4
Do not bend the fuel high-pressure pipe
to correct.
Be sure to use the genuine fuel high-
pressure pipe clamp and strictly observe
the specified tightening torque.
Check the following items and install the
fuel high-pressure pipe. If it has any
defect, replace the high-pressure pipe
with a new one since fuel may leak.
Be sure that the taper seal part of the
connection ((a) part: 2 mm area from the tip-
end) is free from longitudinal slits (b) or pits
(c) with visual check.
Be sure that part (d) (2 mm from the tip-end)
is free from steps which can be felt by your
fingernail, and from fatigue.
1) Temporarily tighten the injector side of fuel
high-pressure pipe (19) to inlet connectors
(30) (4 pieces) with sleeve nut (31).
a Also temporarily tighten the common rail
side of the fuel high-pressure pipes with
sleeve nut.
2) Tighten mounting bolt (24) of injector holder
(25) to the specified torque.
Mounting bolt (24):
39.0 to 49.0 Nm {4.0 to 5.0 kgm}
PC88MR-10