Komatsu PC88MR-10 Shop Manual page 1061

58.Place cylinder head assembly (87) onto the
block, and remove the intake and exhaust
manifold, heater, and connector.
a Remove the intake and exhaust manifold,
heater, and connector. For details, see
"General disassembly of engine" of Engine
Shop Manual.
Installation
(PC88MR-A100-720-K-00-A)
1. Install the intake manifold, heater, and connector.
For details, see "General assembly of engine" of
Engine Shop Manual.
2. Cylinder head assembly
1) Check that the cylinder head and the cylinder
block mounting face are free from dirt or
foreign matter and install cylinder head
gasket (88) to cylinder block assembly (89).
a Install it so that stamp mark "TOP" (a) on
the cylinder head gasket comes to upper
side.
a Check that pin (90) to prevent the wrong
installation of cylinder head gasket on the
upper side of the cylinder block and the
hole of cylinder head gasket are aligned.
2) Sling cylinder head assembly (87) and install
it onto the cylinder block assembly.
Cylinder head assembly (87):
60 kg
PC88MR-10
50 Disassembly and assembly
Engine and cooling system
3) Apply molybdenum disulfide lubricant to the
threaded part of cylinder head mounting bolt
(86).
Threaded part of mounting bolt
(86):
Lubricant containing molybdenum
disulfide (LM-P)
a Tighten the mounting bolt (86) by 2 to 3
threads.
4) Tighten mounting bolt (86) in the order of [1]
to [17] in the following figure and with the
following procedures.
F: Indicates the engine front.
A: Indicates the engine inlet side.
B: Indicates engine exhaust side.
Cylinder head mounting bolt (86):
1st time: 68.6 ± 9.8 Nm {7 ± 1 kgm}
2nd time: 107.8 ± 4.9 Nm {11 ± 0.5
kgm}
3rd time: Put mark (c) on the bolt
head and cylinder head, then turn
the bolt 90 deg. (+30 deg./ 0 deg.)
to tighten.
a After tightening, put a punch mark (d) on
each bolt head to indicate the number of
tightening.
a A bolt which already have 5 punch marks
(d) must be replaced without being
reused any more.
50-33