Yanmar 3JH4E Service Manual page 104

4. Disassembly and Reassembly
(19) Mounting the marine gearbox
1) Mount the fan and damper disk to the flywheel.
2) Align the damper disk with the input shaft spline
and insert. Mount the marine gearbox to the
flywheel housing.
(20) Mounting the cylinder head
1) Put the cylinder head gasket on the cylinder block,
aligning it with the cylinder block positioning pins.
2) Lift the cylinder head horizontally and mount it
aligning with the cylinder head gasket.
3) Coat the flange part and thread of the cylinder
head bolt with engine oil, and lightly tighten the
bolts in the specified
completely, in the same order.
Tightening torque
Cylinder head
bolt
4) Measure the top clearance
Top clearance
(21) Mounting the rocker arm shaft assembly
and pushrods
1) Fit the pushrod to the tappet.
2) Coat the top of the pushrod and the adjusting
screw of the rocker arm with engine oil. Mount the
rocker arm shaft assembly to the cylinder head.
(Apply lube oil to the screw and lock nut.)
Tightening torque
Rocker arm shaft support
3) Adjust valve clearance
Intake/exhaust valve clearance
4) Coat the rocker arm and valve spring with engine oil and mount the rocker arm cover.
order. Then
N•m (kgf•m)
Final
1st step
39.2-49.1 85.2-91.2
(4.0-5.0) (8.69-9.30)
0.74±0.06
N•m (kgf•m)
24-27(2.4-2.8)
0.15-0.25
Assembly
7
13
11
9
tighten
(Head bolt tightening order)
mm
Valve
clearance
mm
88
Damper disk
Marine gearbox
Camshaft side
1 10
3 6
5 4
2 8
Fuel pump side
Rocker arm
Adjusting screw
Lock nut
Engine oil
12
14