Vanguard OHV V-Twin Repair Manual Page 23
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Vanguard
TM
Twin-Cylinder OHV Liquid-Cooled Engine
Section 2 - Troubleshooting
Page 18
CYLINDER BALANCE TEST
If the engine is hard starting, runs rough, misses or lacks
power, perform a cylinder balance test to determine
whether both cylinders are operating to their full
potential.
Tools Required
1. Tachometer,
Tool #19200 or 19389
2. Two #19368 Ignition Testers
3. Screwdriver with insulated handle
Attach ignition tester,
Tool #19368 between the spark
plug lead and each spark plug, Fig. 20.
Fig. 20
Start and run engine running at top no load speed and
note spark at ignition testers. If the spark is equal at both
ignition testers, the problem is not ignition related. A
spark miss will be readily apparent. Now note RPM of
engine. Ground out one cylinder with screwdriver by
contacting alligator clip on ignition tester and a good
ground on engine, Fig. 21. Note RPM loss. Then ground
out the other spark plug and note the RPM loss. If the
difference between the two cylinders does not exceed 75
RPM, the amount of work the two cylinders are doing
should be considered equal.
Fig. 21
Things Which Affect Both Cylinders
1. Carburetion
2. Crankcase vacuum
3. Ignition timing
a. A partially sheared flywheel key will affect
ignition timing and engine performance.
If the RPM loss is greater than 75 RPM this indicates that
the cylinder with the least RPM loss is the weaker of the
two cylinders. Look to that cylinder for a problem.
Example:
Engine RPM - Both Cylinders = 3400 RPM
Engine RPM - #1 Cylinder Grounded = 3300 RPM
Engine RPM - #2 Cylinder Grounded = 3100 RPM
Conclusion: #1 cylinder is the weaker of the two cylinders.
Things Which Affect One Cylinder
1. Spark plug
a. A fouled spark plug may indicate that
carburetor is out of adjustment.
2. Leak in spark plug wire
3. Head gasket
4. Intake manifold
a. A leak at either end of the intake manifold will
only affect one cylinder, not both.
5. Valves
6. Rings
7. Piston
8. Cylinder
The cylinder balance test will also detect a cylinder that
is not functioning. When grounding out one cylinder
- Vanguard Twin Cylinder 1
- OHV Liquid-Cooled Engines 1
- MODEL 473100 2
- COMMERCIAL POWER 2
- SAFETY INFORMATION 3
- Table Of Contents 6
- SECTION 1 GENERAL INFORMATION 8
- ENGINE IDENTIFICATION 9
- MAINTENANCE SCHEDULE 10
- FUEL AND OIL RECOMENDATIONS 11
- CHANGING OIL AND OIL FILTER 12
- CHANGE COOLANT 12
- CLEANING DEBRIS 13
- ADJUST FAN BELT 13
- AIR CLEANER MAINTENANCE 13
- REPLACE SPARK PLUG 14
- Vanguard 15
- SECTION 2 16
- TROUBLESHOOTING 16
- STARTER CURRENT DRAW TEST 17
- NO LOAD STARTER CURRENT DRAW 18
- CHECK CARBURETION 21
- FUEL SHUT-OFF SOLENOID 21
- CYLINDER BALANCE TEST 23
- CYLINDER LEAKDOWN TEST 24
- CHECKING COOLING SYSTEM 26
- CHECK OIL PRESSURE SWITCH 27
- CHECK OIL PRESSURE 28
- CHARGING SYSTEM 28
- BATTERY INFORMATION 30
- EQUIPMENT AFFECTING ENGINE 31
- OPERATION 31
- SECTION 3 32
- ENGINE DISASSEMBLY 32
- DISCONNECT FUEL LINES 33
- REMOVE FAN ASSEMBLY 33
- REMOVE CARBURETOR 34
- REMOVE STARTER 35
- REMOVE INTAKE MANIFOLD 36
- REMOVE ALTERNATOR 37
- REMOVE CYLINDER HEADS 37
- REMOVE CRANKCASE COVER 38
- REMOVE CAMSHAFT 39
- REMOVE PISTONS, RODS 39
- CRANKSHAFT 39
- SECTION 4 40
- ENGINE OVERHAUL 40
- Section 4 - Engine Overhaul 41
- BEARINGS 42
- DISASSEMBLY AND INSPECTION 43
- TOOL #19340 44
- NEW PISTON RING 44
- CRANKPIN BEARING 45
- PISTON PIN BEARING 45
- CYLINDER HEAD INSPECTION AND 46
- OIL PUMP 49
- REPLACING WATER PUMP SEAL 50
- REPLACING STARTER SOLENOID 51
- Fig. 102 52
- Fig. 103 52
- Fig. 104 52
- Fig. 105 53
- Fig. 106 53
- Fig. 107 53
- Fig. 108 53
- Fig. 109 54
- Fig. 110 54
- Fig. 111 54
- Fig. 112 54
- Fig. 113 55
- Fig. 114 55
- Fig. 115 55
- Fig. 116 55
- CARBURETOR INSPECTION AND 56
- Fig. 121 57
- Fig. 122 57
- Fig. 123 57
- Fig. 124 57
- Fig. 125 58
- Fig. 126 58
- Fig. 127 58
- Fig. 128 59
- Fig. 129 59
- Fig. 130 59
- Fig. 131 59
- Fig. 132 60
- Fig. 133 60
- Fig. 134 60
- Fig. 135 60
- SECTION 5 62
- ENGINE ASSEMBLY 62
- Fig. 140 63
- Fig. 141 63
- Fig. 142 63
- INSTALL CAMSHAFT 64
- INSTALL GOVERNOR GEAR 64
- INSTALL CRANKCASE COVER 64
- INSTALL STARTER 65
- INSTALL ALTERNATOR 65
- INSTALL ROCKER ARMS 66
- INSTALL FLYWHEEL 66
- INSTALL CYLINDER HEADS 66
- ADJUST VALVE CLEARANCE 67
- INSTALL ARMATURES 67
- INSTALL FAN ASSEMBLY 68
- INSTALL INTAKE MANIFOLD 69
- ELBOW ASSEMBLY 69
- Fig. 164 70
- Fig. 165 70
- Fig. 166 70
- Fig. 167 70
- ADJUST GOVERNOR 71
- INSTALL MUFFLER 71
- INSTALL RADIATOR 72
- INSTALL AIR CLEANER ASSEMBLY 72
- Fig. 176 73
- Fig. 177 73
- Fig. 178 73
- Fig. 179 73
- Fig. 180 74
- Section 5 - Engine Assembly 75
- SECTION 6 76
- FINAL ADJUSTMENTS AND 76
- SPECIFICATIONS 76
- CARBURETOR ADJUSTMENT 77
- Fig. 187 78
- Fig. 188 78
- Fig. 189 78
- Fig. 190 79
- Fig. 191 79
- Fig. 192 79
- Fig. 193 79
- MODEL 473100 SPECIFICATIONS 80
- ENGINE HARNESS 82
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