GX270T2/UT
(Use the recommended engine oil,
PISTON RING SET
SSEMBLY:
・Be sure that the top and second ring are not interchanged.
・Install the top ring and second ring on the piston with the maker
mark side facing up.
・Check that the piston rings rotate smoothly after installing them.
・Space the piston ring end gaps 120 degrees apart, and do
not align the gaps with the piston pin bore.
PISTON
PISTON PIN CLIP (20 mm) (2)
SSEMBLY:
Install by setting one end of the piston pin clip in the
groove of the piston pin bore, holding the other end
with long needle pliers, and rotating the clip in. Do no
align the end gap of the piston pin clip with the cutout
of the piston pin bore.
CUTOUT
unless otherwise specified.)
TOP RING
(CHROME PLATED)
SECOND RING
OIL RING
(COMBINATION RING)
END GAP
PISTON
PIN CLIP
CONNECTING ROD UPPER
SSEMBLY:
Set the connecting rod upper with
the long end toward the mark on
the piston head.
・
MAKER MARK
PISTON PIN
GX390T2/UT2/RT
PISTON/CRANKSHAFT/BALANCER
TOP RING
Chrome plated
SECOND RING
SIDE RAIL
10 mm (0.4 in)
10 mm (0.4 in)
MARK
SPACER
SIDE RAIL
OIL RING
(COMBINATION
RING)
PISTON
LONG END
Engine Assembly Information
LOCK PIN (10 mm)
INSTALLATION:
・Install the lock pin immediately after
installing the governor arm shaft in
the direction as shown.
・The 10 mm lock pin must be
installed with the straight side of the
10 mm lock pin against the groove of
the governor arm shaft.
(Replace the part(s) with new
one(s) before assembly.)
DRAIN PLUG WASHER (12 mm) (2)
OIL LEVEL SW JOINT
NUT (10 mm)
10 N·m (1.0 kgf·m, 7 lbf·ft)
DRAIN PLUG BOLT (2)
22.5 N·m (2.25 kgf·m, 17 lbf·ft)
WASHER (8.2 x 17 x 0.8 mm)
GOVERNOR ARM SHAFT
OIL LEVEL SW
(If equipped)
FLANGE BOLT
(6 x 12 mm) (2)
PISTON
BALANCER
WEIGHT
GROOVE
PISTON
INSTALLATION:
Install the piston to the cylinder
RIBS
barrel with the mark on the
piston head toward the push
rod hole of the cylinder head.
Viewed from cylinder head side
VALVE LIFTER
REMOVAL:
When removing the valve lifters,
mark so that the intake and
exhaust sides can be
distinguished.
INSTALLATION:
ttach the valve lifters to the
cylinder barrel immediately before
installing the camshaft.
CAMSHAFT SIDE
CONNECTING ROD BOLT (2)
14 N·m (1.4 kgf·m, 10 lbf·ft) (Apply to
the threads and seating surface)
MARK
CRANKSHAFT
INSTALLATION:
Before installing the
crankshaft, check the oil
seal of the cylinder barrel
for damage or hardening.
Be careful not to damage
the oil seal when
installing the crankshaft.
BALANCER WEIGHT/CAMSHAFT INSTALLATION
Install balancer weight to the cylinder barrel by aligning the punch
marks of the balancer weight and the crankshaft (marked on the
balancer drive gear).
BALANCER WEIGHT
PUNCH
MARKS
Install the camshaft to the cylinder barrel by aligning the punch
marks of the camshaft and the crankshaft (marked on the timing
gear).
CRANKSHAFT
CRANKSHAFT
BALANCER
DRIVE GEAR
TIMING GEAR
GOVERNOR HOLDER CLIP
SSEMBLY:
Install firmly into the groove
of the governor shaft.
GOVERNOR WEIGHT
PIN
PLAIN WASHER
GROOVE
BALANCER/CRANKCASE COVER/GOVERNOR
GOVERNOR SLIDER
SSEMBLY:
・Spread the governor weight to install
the governor slider.
・After installing the governor slider,
check to be sure it moves smoothly.
GOVERNOR WEIGHT (3)
REASSEMBLY:
fter installing the governor weight,
check to be sure they move smoothly.
CRANKCASE COVER
EXCEPT E TYPE
CASE COVER PACKING
DOWEL PIN
(8 x 12 mm) (2)
KEY (7 x 7 x 33 mm)
(6.3 x 6.3 x 43 mm)
(If equipped)
CRANKCASE COVER
(Without reduction type)
OIL FILLER CAP
CRANKCASE COVER
(With reduction type)
PUNCH
MARKS
CAMSHAFT
See the shop manual for additional information.
OIL FILLER CAP
(With oil level gauge)
OIL FILLER PACKING (2)
BOLT (8 x 40 mm) (7)
24 N·m (2.4 kgf·m, 17 lbf·ft)
© Honda Motor Co., Ltd. 2010
GX270T2/UT2
・
GX390T2/UT2/RT2 Engine Assembly Information
d
E TYPE
BOTTOM RUBBER
(SMALL)
OIL FILLER CAP
OIL FILLER CAP PACKING
DUCT COVER
(If equipped)
DOWEL PIN
(8 x 12 mm) (2)
BOTTOM RUBBER
(LARGE) (2)
CASE COVER PACKING
CASE COVER
BOLT
(8 x 40 mm) (7)
24 N·m
(2.4 kgf·m, 17 lbf·ft)
BOLT
(5 x 10 mm) (3)
(If equipped)
CRANKCASE COVER/REDUCTION UNIT/COOLING FAN/FLYWHEEL
REDUCTION
TYPE
BOLT (8 x 25 mm)
DISASSEMBLY/ASSEMBLY:
Hold the 16 mm special nut of
the flywheel and remove/install
the 8 x 25 mm flange bolt.
TORQUE: 24 N·m (2.4 kgf·m,
17 lbf·ft)
16 mm SPECIAL NUT
GEAR CASE COVER
FLANGE BOLT (8 x 40 mm) (6)
24 N·m (2.4 kgf·m, 17 lbf·ft)
PRIMARY DRIVE GEAR
WASHER (8 mm)
COUNTER
SHAFT
KEY
(7 x 7 x 33 mm/
6.3 x 6.3 x 43 mm)
P.T.O. SHAFT
CHAIN CASE
COVER PACKING
SPECIAL WOODRUFF KEY
(25 x 18 mm)
DOWEL PIN
(8 x 14 mm) (2)
FLYWHEEL
REMOVAL:
Hold the flywheel with a
commercially available
strap wrench and use
the special tool to
remove the flywheel.
Do not hit the flywheel
with a hammer.
STRAP WRENCH
(Commercially available)
FLYWHEEL
(Without starter)
COOLING FAN
FLYWHEEL PULLER SET
07935-8050004
FLYWHEEL
FLYWHEEL
(With starter)
STARTER PULLEY
(With screen)
SPECIAL NUT (16 mm)
REMOVAL:
Hold the flywheel with a
commercially available
strap wrench and remove
the 16 mm special nut.
Take care not to damage
the cooling fan.
STRAP WRENCH
(Commercially available)
FLYWHEEL
STARTER PULLEY
(With screen)
SPECIAL
NUT
(16 mm)
INSTALLATION:
Clean the tapered parts of
dirt, oil, grease, and other
foreign material before
installation. Be sure there
are no metal parts or other
foreign material on the
magnet part of the flywheel.
"TAPERED PARTS"
lign
FLYWHEEL
pply a light coat of oil to the
threads and the seating surface
of the 16 mm special nut, and
loosely tighten the nut. Hold the
flywheel with a commercially
available strap wrench, and
tighten the 16 mm special nut to
the specified torque.
TORQUE: 170 N·m (17.3 kgf·m,
125 lbf·ft)
STRAP WRENCH
FLYWHEEL
"MAGNET
PART"
STARTER
PULLEY
lign
COOLING FAN
(Threads and
seating surface)
COOLING FAN/FLYWHEEL/CYLINDER HEAD/VALVES
INTAKE/EXHAUST VALVE SPRING RETAINER
DISASSEMBLY:
Push down and slide the valve spring retainer to the side so that the
valve stem slips through the hole at the side of the valve spring retainer.
Do not remove the valve spring retainer while the cylinder head is
installed to the cylinder barrel, or the valve will drop into the cylinder.
(Apply to the
tappet surface
and pivot)
VALVE ROCKER ARM
SSEMBLY:
Before installing the rocker
arm, check for wear on the
surface of the rocker arm
that contact the pivot bolt,
push rod, and valve stem.
PIVOT ADJUSTING
NUT (2)
10 N·m
(1.0 kgf·m, 7 lbf·ft)
ROCKER ARM
PIVOT (2)
(Apply to
the threads
and pivot)
8 mm PIVOT BOLT (2)
24 N·m (2.4 kgf·m,
17 lbf·ft)
PUSH ROD GUIDE PLATE
VALVE SPRING
SEAT
VALVE GUIDE
CLIP
EXHAUST
VALVE
GUIDE
CT BOLT
(6 x 12 mm)
VALVE
SPRING (2)
PUSH ROD (2)
SSEMBLY: Before installing the push rods, check the
ends of the push rods for wear. Be sure the ends of
the push rods are firmly seated in the valve lifters.
SPARK PLUG
EXHAUST VALVE
SSEMBLY:
Do not interchange
with the intake valve.
VALVE HEAD
DIAMETER: 31 mm
INTAKE VALVE
SSEMBLY:
Do not interchange
with the exhaust valve.
VALVE HEAD
DIAMETER: 33 mm
INTAKE VALVE GUIDE
SHROUD
VALVE
STEM SEAL
HEAD COVER PACKING
INSTALLATION:
Note the
installation
direction.
HEAD
COVER
HEAD COVER
BOLT
HEAD
COVER
HEAD COVER
WASHER
FLANGE BOLT (10 x 80) (4)
REMOVAL/INSTALLATION:
Loosen and tighten the four 10 x 80 mm flange
bolts in a crisscross pattern in 2 - 3 steps.
TORQUE: 35 N·m (3.5 kgf·m, 26 lbf·ft)
HEAD
COVER
PACKING
(Apply to the
threads and
seatin
surface
DOWEL PIN
(12 x 20 mm) (2)
FAN COVER
CYLINDER HEAD GASKET
CYLINDER HEAD
INSTALLATION:
Before installing the cylinder head, remove
any carbon deposits from the combustion
chamber, and inspect the valve seat.
fter installing the cylinder head, measure
the cylinder compression.
See the shop manual for additional information.
© Honda Motor Co., Ltd. 2010