Yanmar 3JH4E Service Manual page 84

2. Inspection and adjustment
c) Valve clearance measurement and
adjustment
(c-1) For 2 valves system (3JH4E, 4JH4E),
insert a thickness gage between the
rocker arm and valve cap, and record
the measured valve clearance.
(c-2) For 4 valves system (4JH4-TE, 4JH4-
HTE), insert
between the rocker arm and the valve
bridge, and record the measured
valve clearance.
d) Measuring other cylinders
(d-1) 3JH4E
Turn the crankshaft 240
measurement and adjustment for the No.3
cylinder. Then adjust the No.2 cylinder.
The cylinder to be measured and adjusted
first does not have to be the No.1 cylinder.
Select and adjust the cylinder where the
piston is the nearest to the top dead center
after turning, and make measurement and
adjustment for other cylinders in the order of
ignition by turning the crankshaft 240
time.
The measurement and adjustment method
of reducing the flywheel turning numbers
(for reference):
Set No.1 cylinder to the compression T.D.C.
and adjust the clearance of the
the below table. Next, turn the flywheel
once (the suction/exhaust valve of No.1
cylinder is in the position of the overlap
T.D.C. at this time), and adjust the
clearance of the
Ignition order of 3 cylinder engines: 1
2
Cylinder No.
Valve
No.1 compression T.D.C
No.1 overlap T.D.C
a thickness gage
and make
°
° e ach
mark of
mark.
→
3
1
Suction Exhaust Suction
2-valve head
Rocker arm
Valve
clearance
4-valve head
Valve bridge
Valve
clearance
→
2
Exhaust Suction
64R1
Adjusting screw
Lock nut
010612-00E
Rocker arm
010613-01E
3
Exhaust
The first time
The second time