Yanmar 3JH3E - Page 260

Chapter
JO
Disassembly and Reassembly
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3,4JH3(B)(C)E
3-2.4 Mounting
the
camshaft
(1)
If
the camshaft and camshaft gear have been disas·
sembled, shrink fit the camshaft and camshaft
gear [ heat the camshaft gear
to
180-200'C
in
the
hot oil and press fit).
NOTE : When mounting the camshaft
and
camshaft gear,
be sure not
to
forget assembfy
of
the
thrust rest.
Also make sure they are assembled with the cor-
rect orientation.
(2)
Coat the cylinder block camshaft bearings
and
camshaft
with engine oil, insert the camshaft in the cylinder
block, and mount the thrust rest with the bolt.
(3)
Measure the camshaft side gap.
Camshaft side gap
0.05~0.20
(4)
Make sure that the camshaft rotates smoothly.
3-2.5 Mounting the crankshaft
mm
(1)
The crankshaft and crankshaft gear are shrink fitted.
If
the crankshaft and crankshaft gear have been dis-
assembled, they have to be shrink fitted [ heat the
crank shaft gear to
180°
-2oo·c
in
the hot oil and
press
fit].
(2)
Coat the cylinder block crank journal holes and upper
part
of
the main bearing metal with oil and fit the upper
main bearing metal onto the cylinder block.
NOTE :
1.
Be sure not to confuse the upper
and
tower
main bearing metafs.
The
upper metal has an
oif groove.
2.
When mounting
the
thrust metaf, fit it so that
the surface with
the
oil groove slit faces
outwards, (crankshaft side).
(3)
Coat the crank pin and crank journai with engine oil
and place them
on
top of the main bearing metal.
NOTE
:
1.
Align the crankshaft
gear
and
camshaft
gear
with
the
"A" match mark.
2.
Position so that the crankshaft gear is on the
gear case side.
3.
Be careful not
to
let the thrust metal drop.
10-24
3-2.6 Mounting the main bearing metal with engine
oil, and mounting the main bearing cap.
NOTE :
1.
The
lower main bearing metal does not have
an oil groove.
2.
The
standard bearing thrusr metal is fitted with
the oil groove slit facing outwards.
(1)
Coat the main bearing cap bolt washer contact surface
and
threads
with
engine
oil,
place
them
on
the
crankshaft journal, and tighten the main bearing baits
to
the specified torque.
kg·m
Main
bearing
bolt
tightening
torque
j
10.5~11.5
NOTE :
1.
The
main bearing cap shoufd be fitted with the
arrow near the embossed letters "FW" on the
cap pointing towards the flywheel.
2.
Make sure you have the correct cylinder align-
ment no
(2)
Measure the crankshaft side clearance.
Crankshaft
side
clearance
0,
140~0.220
(3)
Make sure that the crankshaft rotates smoothly and
easily.
mm
Printed in Japan
HINSHJ.H8009