Service Manual
Table Of Contents
- BINDING
- INTRODUCTION
- How to use this manual
- Safety Cautions
- Fire and explosion
- Stay clear of all rotating and moving parts
- Be careful of burns
- Be careful of exhaust fume poisoning
- Protect ears from noises
- Be careful of falling down
- Be careful of handling fuel, engine oil and LLC
- Service battery
- When abnormality occurs
- Other cautions
- Modification of engine prohibited
- Never break the seals
- Pre-operational check and periodic inspection/maintenance
- Break-in operation
- Warming-up operation
- Avoid engine operations in a overload condition
- Cooling operation before stopping engine
- Protection of engine against water entry
- Maintenance of air cleaner or pre-cleaner
- Observe safety rules at work site
- Work clothing and protective gear
- Use of tools optimum for each work
- Avoidance of prolonged time of starter operation
- Do not turn off battery switch during operation
- Cautionary instructions for transporting engine
- Avoid continuous engine operation in a low load condition
- Ventilation of engine room
- Avoid contact with high-pressured fuel
- About warning labels
- GENERAL CONTENTS
- GENERAL
- SERVICE DATA
- SERVICE TOOLS
- DETERMINATION OF OVERHAUL
- DISASSEMBLY OF BASIC ENGINE
- 1. Disassembling and inspecting cylinder head and valve mechanism
- 2. Disassembling and inspecting flywheel
- 3. Disassembling and inspecting damper, gear case, timing gear and camshaft
- 3.1 Removing crankshaft pulley and damper
- 3.2 Removing cover
- 3.3 Removing timing gear case
- 3.4 Measuring timing gear backlash
- 3.5 Measuring idler gear and camshaft gear end play
- 3.6 Removing fuel injection pump
- 3.7 Removing oil pan
- 3.8 Removing oil strainer
- 3.9 Removing oil pump gear
- 3.10 Removing idler gear
- 3.11 Removing PTO drive gear
- 3.12 Removing camshaft
- 3.13 Separating camshaft gear
- 3.14 Installing camshaft gear and thrust plate
- 3.15 Removing front plate
- 3.16 Removing oil pump
- 4. Disassembling and inspecting piston, connecting rod, crankshaft and crankcase
- INSPECTION AND REPAIR OF BASIC ENGINE
- 1. Inspecting and repairing cylinder head and valve mechanism
- 1.1 Measuring clearance between rocker bushing and rocker shaft
- 1.2 Measuring valve stem outside diameter and valve guide inside diameter
- 1.3 Replacing valve guide
- 1.4 Inspecting valve face
- 1.5 Refacing valve face
- 1.6 Refacing valve seat
- 1.7 Replacing valve seat
- 1.8 Lapping valve and valve seat
- 1.9 Measuring perpendicularity and free length of valve spring
- 1.10 Measuring distortion of the bottom surface of the cylinder head
- 1.11 Measuring push rod runout
- 1.12 Removing combustion jet
- 2. Inspecting and repairing flywheel
- 3. Inspecting and repairing timing gear and camshaft
- 3.1 Measuring timing gear backlash
- 3.2 Measuring idler gear and camshaft gear end play
- 3.3 Measuring cam lift
- 3.4 Measuring camshaft runout
- 3.5 Measuring camshaft journal outside diameter
- 3.6 Measuring camshaft bushing inside diameter
- 3.7 Replacing camshaft bushing
- 3.8 Measuring idler bushing inside diameter and idler shaft outside diameter
- 3.9 Replacing idler shaft
- 3.10 Measuring clearance between tappet and tappet guide hole
- 3.11 Inspecting tappet
- 3.12 Inspecting V-belt groove wear
- 3.13 Inspecting damper
- 4. Inspecting and repairing piston, connecting rod, crankshaft and crankcase
- 4.1 Measuring crankcase top surface distortion
- 4.2 Measuring cylinder inside diameter
- 4.3 Measuring piston outside diameter
- 4.4 Measuring piston ring end gap
- 4.5 Measuring clearance between piston ring groove and piston ring
- 4.6 Measuring piston pin bore diameter and piston pin outside diameter
- 4.7 Measuring piston protrusion
- 4.8 Measuring clearance between connecting rod bearing and crankpin
- 4.9 Measuring clearance between connecting rod bushing and piston pin
- 4.10 Replacing connecting rod bushing
- 4.11 Inspecting connecting rod bend and twist
- 4.12 Inspecting connecting rod bearing
- 4.13 Measuring connecting rod end play
- 4.14 Weight difference of connecting rod assembly in one engine
- 4.15 Measuring crankshaft journal outside diameter
- 4.16 Measuring crankshaft crankpin outside diameter
- 4.17 Grinding crankshaft
- 4.18 Measuring crankshaft end play
- 4.19 Measuring crankshaft runout
- 4.20 Replacing crankshaft gear
- 4.21 Inspecting oil seal contact surface
- 4.22 Installing oil seal sleeve
- 4.23 Removing oil seal sleeve
- 4.24 Inspecting main bearing surface
- 4.25 Measuring clearance between main bearing and crankshaft journal
- 1. Inspecting and repairing cylinder head and valve mechanism
- REASSEMBLY OF BASIC ENGINE
- 1. Reassembling piston, connecting rod, crankshaft and crankcase
- 1.1 Installing main bearing
- 1.2 Installing thrust plate
- 1.3 Installing tappet
- 1.4 Installing crankshaft
- 1.5 Installing main bearing caps
- 1.6 Inserting side seal
- 1.7 Installing main bearing cap bolt
- 1.8 Measuring crankshaft end play
- 1.9 Reassembling piston and connecting rod
- 1.10 Installing piston ring
- 1.11 Preparation for installing pistons
- 1.12 Installing connecting rod bolt and connecting rod bearing
- 1.13 Installing pistons
- 1.14 Installing connecting rod cap
- 2. Reassembling timing gear and camshaft
- 2.1 Installing oil pump
- 2.2 Installing front plate
- 2.3 Installing camshaft gear and thrust plate
- 2.4 Installing camshaft
- 2.5 Installing PTO drive gear
- 2.6 Installing idler gear
- 2.7 Installing oil pump gear
- 2.8 Installing fuel injection pump
- 2.9 Inspecting and adjusting timing gear after installation
- 2.10 Installing front oil seal
- 2.11 Installing timing gear case
- 2.12 Installing oil strainer
- 2.13 Installing oil pan
- 2.14 Installing cover
- 2.15 Installing crankshaft pulley and damper
- 3. Reassembling flywheel
- 4. Reassembling cylinder head and valve mechanism
- 4.1 Cleaning cylinder head bottom surface
- 4.2 Installing valve stem seal
- 4.3 Installing valve and valve spring
- 4.4 Installing cylinder head gasket
- 4.5 Installing cylinder head assembly
- 4.6 Tightening cylinder head bolts
- 4.7 Inserting push rod
- 4.8 Reassembling rocker shaft assembly
- 4.9 Installing rocker shaft assembly
- 4.10 Determining top dead center of No. 1 cylinder compression stroke
- 4.11 Adjusting valve clearance
- 4.12 Installing rocker cover
- 1. Reassembling piston, connecting rod, crankshaft and crankcase
- FUEL SYSTEM
- 1. Removing fuel system
- 2. Disassembling, inspecting and reassembling fuel system
- 2.1 Disassembling and inspecting fuel filter
- 2.2 Changing fuel filter
- 2.3 Disassembling and inspecting fuel injection nozzle
- 2.4 Inspecting and adjusting fuel injection valve opening pressure
- 2.5 Inspecting fuel spray pattern of fuel injection nozzle
- 2.6 Cleaning and inspecting nozzle tip
- 2.7 Reassembling fuel injection nozzle
- 2.8 Inspecting and cleaning gauze filter of distribute type fuel injection pump
- 3. Installing fuel system
- LUBRICATION SYSTEM
- 1. Removing lubrication system
- 2. Disassembling, inspecting and reassembling lubrication system
- 2.1 Disassembling and inspecting oil pump
- 2.2 Inspecting oil pump
- 2.2.1 Measuring clearance between outer rotor and inner rotor
- 2.2.2 Measuring end play of rotor and pump case
- 2.2.3 Measuring clearance between outer rotor and pump case
- 2.2.4 Measuring clearance between main shaft and pump case
- 2.2.5 Measuring clearance between main shaft and bushing
- 2.2.6 Installing oil pump bushing
- 2.3 Reassembling oil pump
- 2.4 Disassembling and inspecting oil cooler
- 2.5 Inspecting oil filter
- 2.6 Inspecting relief valve
- 2.7 Inspecting safety valve
- 3. Installing lubrication system
- COOLING SYSTEM
- INLET AND EXHAUST SYSTEMS
- ELECTRICAL SYSTEM
- 1. Removing electrical system
- 2. Disassembling, inspecting and reassembling electrical system
- 2.1 Inspection before disassembling starter
- 2.2 Disassembling and inspecting starter
- 2.3 Inspecting and repairing starter
- 2.3.1 Inspecting brushes for wear
- 2.3.2 Measuring brush spring load
- 2.3.3 Inspecting brush holder for insulation
- 2.3.4 Measuring commutator radial runout
- 2.3.5 Measuring commutator outside diameter
- 2.3.6 Measuring undercut depth
- 2.3.7 Checking armature coil
- 2.3.8 Inspecting field coil
- 2.3.9 Inspecting rear bracket
- 2.3.10 Inspecting overrunning clutch operation
- 2.3.11 Inspecting front bracket
- 2.3.12 Inspecting gears of starter
- 2.3.13 Inspecting magnetic switch
- 2.3.14 Inspecting starter relay
- 2.4 Reassembling starter
- 2.5 Disassembling and inspecting alternator
- 2.6 Inspecting and repairing alternator
- 2.7 Reassembling alternator
- 2.8 Inspecting glow plug
- 2.9 Inspecting magnetic valve (stop solenoid)
- 2.10 Installing magnetic valve (stop solenoid)
- 3. Installing electrical system
- ADJUSTMENT AND OPERATION
- 1. Adjusting engine
- 2. Break-in operation
- 3. Performance test (JIS standard)
INTRODUCTION
III
Safety Cautions
Fire and explosion
Keep flames away
Store fuel and engine oil in a well
ventilated designated area.
Make sure that the caps of fuel and
engine oil containers are tightly
closed.
Do not use flames, do not smoke,
and do not work near a heater or other fire hazard
where fuel or oil is handled or when cleaning solvent is
being used for washing parts.
Wipe off spilled fuel, oil and LLC immediately and thor-
oughly. Spilled fuel, oil and LLC may ignite and cause
a fire.
Keep surrounding area tidy and clean
Do not leave combustible or explosive materials, such
as fuel, engine oil and LLC, near the engine. Such sub-
stances can cause fire or explosion.
Remove dust, dirt and other foreign materials accumu-
lated on the engine and surrounding parts thoroughly.
Such materials can cause fire or the engine to over-
heat. In particular, clean the top surface of the battery
thoroughly. Dust can cause a short-circuit.
Always operate the engine at a position at least 1 m
[3.28 ft.] away from buildings and other equipment to
prevent possible fire caused by engine heat.
Avoid accessing crankcase until engine
cools
Do not attempt to open the side cover of the crankcase
before the engine cools down. Wait at least 10 minutes
after stopping the engine.
Opening the cover when the engine is hot allows fresh
air to flow into the crankcase, which can cause oil mist
to ignite and explode.
Care about fuel, oil and exhaust gas leakage
If any fuel, oil or exhaust gas leakage is found, immedi-
ately take corrective measures to stop it.
Such leakages, if left uncorrected, can cause fuel or
engine oil to reach hot engine surfaces or hot exhaust
gas to contact flammable materials, possibly leading to
personal injury and/or damage to equipment.
Use explosion-proof lighting apparatus
When inspecting fuel, engine oil, coolant, battery elec-
trolyte, etc., use a flameproof light. An ordinary light, if
accidentally broken, may ignite and cause an explo-
sion.
Prevent electrical wires from short-circuit-
ing
Avoid inspecting or servicing the electrical system with
the ground cable connected to the battery. Otherwise,
a fire could result from short-circuiting. Be sure to dis-
connect the battery cable from the negative (-) terminal
before beginning with the work procedure.
Short-circuits, possibly resulting in fire, may be caused
by a loose terminal or damaged cable/wire. Inspect the
terminals, cables and wires, and repair or replace the
faulty parts before beginning with the service proce-
dure.
Keep fire extinguishers and first-aid kit
handy
Keep fire extinguishers handy, and
become familiar with their usage.
Keep a first-aid kit at the designated
place where it is easily accessible
by anyone at any time.
Establish response procedures to
follow in the event of fire or accident. Provide an emer-
gency evacuation route, contact points, and means of
communication in case of emergency.
WARNING