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Yanmar 3HMF Shop Manual
240 pages
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YANMAR
DIESEL
INBOARD
SHOP
MANUAL
ONE,
TWO
8.
THREE
CYLINDER
ENGINES
2
Table of Contents
Default Chapter
3
Table of Contents
3
Freshwater (Closed) Cooling System Capacity
6
Quick Reference Data
6
Tune-Up Specifications
6
Approximate Engine Oil Capacities
6
General Torque Specifications
7
Chapter One
8
General Information
8
Manual Organization
8
Service Hints
10
Fasteners
11
Parts Replacement
11
Torque Specifications Info
11
Bolts
12
ISO Metric Screw Threads
12
Machine Screws
12
Machine Screws View
13
Nuts
13
Openings for Tools View
13
Self-Locking Fasteners
13
Cotter Pins
14
General Information
14
Washers
14
Circlips
15
Engine Oil
15
Lubricants
15
Basic Hand Tools
16
Grease
16
RTV Gasket Sealant
16
Threadlock
16
Screwdrivers
17
Circlip Pliers
18
Locking Pliers
18
Pliers
18
Adjustable Wrenches
19
Box-End, Open-End and Combination Wrenches
19
Socket Wrenches
19
Torque Wrench, Impact Driver
19
Feeler Gauge
20
Hammers
20
Precision Measuring Tools
20
Cylinder Bore Gauge
21
Dial Indicator
21
Outside Micrometers
21
Telescoping Gauges
21
Battery Hydrometer
22
Compression Gauge
22
Multimeter or vom
22
Screw Pitch Gauge
22
Expendable Supplies
23
Mechanic's Tips
23
Removing Broken Screws or Bolts
23
Removing Frozen Nuts and Screws
23
Remedying Stripped Threads
24
Removing Broken or Damaged Studs
24
Bearing Removal
25
Bearing Replacement
25
Bearing Installation
26
Shrink Fit
27
Seals
30
Decimal and Metric Equivalents Table
31
Chapter Two
32
Parts Replacement
32
Troubleshooting
32
Starting System Operation
33
Troubleshooting
33
Slow Running Starter
34
Starter Solenoid Chatters (no Click), Starter Does Not Run
34
Starter Solenoid Clicks, Starter Does Not Run
34
Starting System On-Boat Testing
34
Loud Grinding Noises When Starter Runs
35
Starter Solenoid Resistance Tests
35
Starter Spins but Does Not Rotate Flywheel
35
Starter will Not Disengage When Start Switch Is Released
35
Charging System Diagram
36
Alternator Regulated Voltage Test
37
Charging System Tests
37
Charging System Troubleshooting
37
Alternator Current Output Test
38
Fuel System Troubleshooting
38
Voltage Output Test
38
Engine Speed Decreases Unexpectedly
39
Engine Stops Suddenly
39
Engine will Not Run under Full Load
39
Engine will Not Start
39
Cooling System Troubleshooting
40
Engine Overheating
40
Fuel Injection System Diagram
40
Black Smoke
41
Blue Smoke
41
Engine Noises
41
White Smoke
41
Cooling System
42
Engine Misses
42
Engine Troubleshooting
42
Low Oil Pressure
42
Lubrication System Troubleshooting
42
Lubrication System (1 GM and 1 GM1O Models) Diagram
43
Lubrication System (2GM and 2GM2O Models) Diagram
44
Lubrication System (3GM, 3GM3O, 3HM and 3Hm35Models) Diagram
45
Engine Troubleshooting Table
46
Oil Pressure Test
46
Oil Pressure Table
47
Starter Motor No-Load Specifications
47
Chapter Three
48
Starting Checklist
49
Operation, Lubrication, Maintenance and Tune-Up
48
Preoperational Checks
48
Ruel Requirements
48
Engines Equipped with Remote Control
49
Engines Without Remote Control
49
Emeregency Engine Stopping
50
Engine Maintenance and Lubrication
50
Post-Operatinal Checks
50
Stopping the Engine
50
Engine Oil and Filter Change
51
Engine Oil Level Check
51
Fuel System Service
52
Fuel Filter
53
Fuel Lines
53
Air Filter
54
Bleeding Air from Fuel System
54
Drive Belts
54
Alternator Drive Belt Adjustment (Models Equipped with Freshwater Cooling)
55
Alternator Drive Belt Adjustment (Models Equipped with Seawater Cooling)
55
Seawater Pump Drive Belt Adjustment (2GM, 2GM20, 3GM, 3GM30, 3HM and 3HM35 Models)
55
Alternator Drive Belt Replacement (All Models)
56
Crankcase Breather
56
Seawater Pump Drive Belt Replacement
56
Anticorrosion Maintenance
57
Cooling System
58
Anode Mountings Diagram
59
Flushing the System
59
Seawater (Standard) Cooling Systems
59
Coolant
60
Freshwater (Closed) Cooling Systems
60
Remote Reservoir Checking/Filling
60
Fresh Water Heat Exchanger Diagram
61
Battery Maintenance
62
Flushing and Refilling Freshwater Coolant System
62
Battery Cutaway View
63
Compression Test
63
Engine Tune-Up
63
Valve Clearance Adjustment
64
Idle Speed Adjustment
65
Transmisson Oil
66
Engine Oil Crankcase Capacity
67
Engine Oil Viscosity
67
Maintenance Schedule Table
67
Transmission Oil Level Check
67
Compression Specifications
68
Freshwater (Closed) Cooling System Capacity Table
68
Tune-Up Specificationis Table
68
Lay-Up and Fitting out
69
Chapter Four
69
Lay.upandfitt1Ngout
69
Cooling System Draining
70
Seawater Cooling System
70
Adding Antifreeze
71
Freshwater (Closed) Cooling Section
71
Freshwater (Closed) Cooling System
71
Fitting out
72
Seawater Cooling Section
72
Chapter Five
74
Diesel Engine Fundamentals
74
Single-Cylinder Engines
74
4-Stroke Diesel Engine Principles
75
Engine Removal Precautions
76
Engine Serial Number and Code
76
Replacement Parts (Engine)
76
Breather Assembly
77
Engine Removal/Installation
77
Valve Cover
77
Valve Cover Assembly Diagram
78
Cylinder Head Diagram
79
Cylinder Head Removal
79
Decompressoin Mechanism
79
Cylinder Head Inspection
80
Cylinder Head Installation
81
Rocker Shaft Assembly
82
Valve Components Diagram
83
Valve Removal
83
Valves and Valve Seats
83
Valve Inspection
84
Piston/Connecting
85
Valve Guide Replacement
85
Piston Pin Removal/Installation
86
Piston/Cylinder
87
Piston Ring Fit/Installation
88
Connecting Rod Inspection
89
Connecting Rod Bearing Clearance Measurement
90
Piston/Connecting Rod Installation
90
Timing Gearcase
91
Lubrication System Maintenance
92
Oil Pump
92
Oil Pump Removal and Installation
93
Oil Pump Disassembly, Inspection and Reassembly
94
Flywheel Removal/Installation
95
Oil Pickup
95
Pressure Relief Valve
95
Crankshaft Assembly Diagram
96
Crankshaft Removal and Installation
97
Camshaft Removal and Installation
99
Crankshaft Inspection
99
Main Bearings
99
Core Plug Replacement
101
Cylinder Block Cleaning and Inspection
101
Core Plug Removal and Installation
102
Engine Specifications Table (1GM, 1Gml0 )
103
Cylinder Head
104
Engine Serial Number and Code (Multicylinder)
105
Multicylinder Engines
105
Engine Removal/Installation (Multicylinder)
106
Replacement Parts
106
Breather Assembly (Multicylinder)
107
Valve Cover (2GM, 2GM20, 3GM and 3GM30)
107
Decompression Mechanism
108
Valve Cover (3HM and 3HM35)
108
Exhaust Manifold Removal and Installation
109
Exhaust Manifold with Closed Cooling System View
110
Cylinder Head Inspection (Multicylinder)
111
Cylinder Head Removal (Multicylinder)
111
Cylinder Head Installation (Multicylinder)
114
Rocker Shaft Assembly (Multicylinder)
115
Valves and Valve Seats (Multicylinder)
116
Valve Inspection (Multicylinder)
117
Valve Removal (Multicylinder)
117
Valve Guide Replacement (Multicylinder)
118
Piston/Connecting (Multicylinder)
119
Push Rods (Multicylinder)
119
Piston Pin Remova/Installation (Multicylinder)
120
Piston/Cylinder (Multicylinder)
120
Piston Ring Fit/Installation (Multicylinder)
121
Connecting Rod Inspection (Multicylinder)
122
Connecting Rod Bearing Clearance Measurement (Multicylinder)
123
Piston/Connecting Rod Installation (Multicylinder)
123
Timing Gearcase (Multicylinder)
124
Governor Assembly Diagram
126
Lubrication System (Multicylinder Engines)
126
Oil Pump Removal and Installation (Multicylinder)
126
Oil Pump Disassembly, Inspection and Reassembly (Multicylinder)
127
Flywheel Removal/Installation (Multicylinder)
128
Oil Pickup (Multicylinder)
128
Oil Pressure Regulator Diagram (Multicylinder)
128
Pressure Relief Valve (Multicylinder)
128
Crankshaft Removal and Installation (Multicylinder)
129
Crankshaft Diagram (Multicylinder)
130
Crankshaft Inspectioni (Multicylinder)
132
Main Bearings (Multicylinder)
132
Camshaft Removal and Installation (Multicylinder)
133
Intermediate Main Bearing
133
Cylinder Block Cleaning and Inspection (Multicylinder)
134
Camshaft Assembly View
135
Cylinder Liners 2GM, 3GM and 3HM (Including F and D Series) Models
135
Core Plug Replacement (Multicylinder)
137
Engine Specifications (2GM and 2GM20)
138
Engine Specifications (3GM and 3GM30)
139
Engine Specifications (3HM and 3HM35)
141
Fuel Injection and Governor Systems
144
Fuel Injection Fundamentals
144
Fuel Injection System View
145
Fuel Injector
146
Fuel and Fuel Filters
146
Injection Pump View
147
Fuel Injection System Bleeding
148
Fuel Transfer Pump
148
Fuel Injection Timing
150
Adjust Fuel Injection Timing
151
Fuel Injector Info
152
Fuel Injector Removal and Installation
153
Fuel Injection Pump Removal and Installation
155
Fuel Pump Testing
156
Fuel Pump Removal and Installation
156
Fuel Lines Inspection
157
Governor System Operation
158
Governor System Diagrams
159
Governor System Adjustments
160
Governor Assembly View
161
Governor Components Removal/Inspection/Installation
161
Governor System Tightening Torques
164
Governor Spring Free Length Table
164
Governor Sleeve and Crankshaft Specifications
164
Chapter 8: Cooling System
165
Seawater (Standard) Cooling System
165
Chapter Eight
166
Seawater Cooling System Diagram (1GM and 1GM10)
166
Seawater Cooling System Diagram (2GM and 2GM20)
167
Seawater Cooling System Diagram (3GM and 3GM30)
168
Freshwater (Closed) Cooling System Diagram/Description
169
Closed Cooling System (Typical) Diagram
170
Heat Exchanger Diagram
171
Thermostat
171
Thermostat Removal/Installation
172
Cooling Systems
173
Thermostat Testing (in Engine)
173
Thermostat Testing (out of Engine)
173
Hose Replacement
174
Overheated Engine
174
Slow Engine Warm-Up
174
Alternator Belt Drive Replacement
175
Drive Belt Routing Diagram
175
Drive Belts Description
175
Seawater Pump
176
Seawater Pump Drive Belt Replacement (Except 1GM and 1GM10 Engines)
176
Seawater Pump Precautions
177
Seawater Pump Removal/Installation
177
Water Pump Operating Mistakes
177
Seawater Pump Disassembly/Assembly
178
Seawater Pump Diagram (1GM and 1GM10 Models)
179
Seawater Pump Diagram (2GM, 2GM20,3GM and 3GM30 Models)
181
Seawater Pump Diagram (3HM and 3HM35 Models)
182
Freshwater Cooling System Maintenance
183
Freshwater Pump Removal/Installation
183
Pressure Testing
183
Cleaning the Seawater Section of the Heat Exchanger
185
Closed Cooling System Diagram
185
Freshwater Exhaust Manufold/Heat Exchanger Diagram
186
Seawater Cooling System Maintenance
187
Recommended Thermostat
188
Seawater/Freshwater Pumps Tightening Torques
188
Electrical System
189
Chapter Nine
189
Switches
189
Electrical System - Safety Precautions
190
Electrical System - Care and Inspection
191
Battery Testing
192
Charging
193
Jump Starting
193
Electrical Protection
194
Battery Cables
194
Charging System
195
Preliminary Testing
195
Starting System
196
Starter Removal/Installation
196
Alternator Removal/Installation
196
Solenoid Removal/Installation
197
Brush Replacement
197
Starter Motor Diagram (Except 3HM and 3HM35 Models)
198
Starter Motor Diagram (3HM and 3HM35 Models)
199
Switches
201
Senders
201
Oil Pressure Sender
201
Battery Cutoff Switch
201
Coolant Temperature Sender
202
Coolant and Oil Pressure Warning Lamps
203
Charging System Warning Lamp
203
Alarm Buzzer
203
Tachometer
203
Tachometer Sender
204
Tachometer Gauge
204
Battery Capacity Table
204
Alternator and Starter Motor Tightening Torques
204
Transmission - KM Series
205
Cone Clutch View
206
Shifter View (KM2A, KM2C and KM3A Models)
206
Chapter Ten
206
Shifter View (KM2P, and KM3P Models)
207
Transmission (KM) Removal and Installation
207
Transmission-Km Series
207
Transmission (KM) Disassembly
208
Input Shaft Inspection
209
Transmission (KM) Inspection
209
Intermediate Shaft Inspection
210
Output Shaft Inspection
210
Output Shaft Diagram
211
Shifter Diagram (KM2A, KM2C and KM3A Models)
212
Transmission (KM) Reassembly
214
Shifter Detent (KM2P and KM3P Models)
215
Shifter Diagram (KM2P and KM3P Models)
215
Bearing Adjustment
217
Output Shaft
218
Drive Disc Inspection
219
Drive Disc Removal/Installation
219
Clutch Groove Width
220
Engine Transmission Models Table
220
Output Shart Table
220
Tightening Torques Table (Transmission KM Series)
220
Shifter Data Tables
221
Chapter Eleven
222
Operation
222
Transmission (KBW Series) Removal/Installation
223
Transmission (KBW Series) Overhaul
223
Transmission (KBW Series) Disassembly
223
Transmission (KBW Series) Diagram
224
Input Shaft (KBW)
226
Intermediate Shaft (KBW)
226
Output Shaft (KBW)
226
Transmission (KBW) Inspection
227
Transmission (KBW) Reassembly
228
Shifter (KBW)
229
Bearing Adjustment (KBW)
230
Drive Disc (KBW) Removal/Installation
231
Drive Disc (KBW) Inspection
231
Engine/Transmission (KBW) Data
232
Tightening Torques (KBW)
232
Clutch Specifications (KBW)
232
Transmission - KBW Series
222
Drivedisc
232
Index
233
Battery
236
Early Models with Large Instrument Panel Wiring Diagram
237
Senders
237
Wiring Diagrams
237
Early Models with Small Instrument Panel (no Tachometer) Wiring Diagram
238
Late Models with Large Instrument Panel Wiring Diagram
239
Late Models with Small Instrument Panel (no Tachometer) Wiring Diagram
240
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Yanmar 3HMF Specifications
General
Engine Model
3HMF
Number of Cylinders
3
Starting System
Electric starter
Lubrication System
Forced lubricating
Fuel
Diesel
Type
4-cycle, water-cooled diesel
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