Briggs & Stratton 272147 Operating instructions

®
®
BRIGGS & STRATTON CORPORATION
Milwaukee, WI 53201
Part No. 275429-1/04 Printed in U.S.A.
www.briggsandstratton.com
272147 - Single Cylinder OHV Air-Cooled Engines
272144 - Vanguard™ Twin Cylinder OHV Air-Cooled Engines
275429 - Vanguard™ Twin Cylinder OHV Liquid-Cooled Engines
MS-0750 - Vanguard™ 3-Cylinder OHV Liquid-Cooled Gasoline Engines
MS-1055 - Vanguard™ 3-Cylinder OHV Liquid-Cooled Diesel Engines
Quality Starts With A
Master Service Technician
Other Briggs & Stratton
Commercial Power Repair Manuals:
Vanguard Twin Cylinder
OHV Liquid-Cooled Engines
Briggs & Stratton VANGUARD™ TWIN CYLINDER OHV LIQUID-COOLED ENGINES Part No. 275429-1/04
REPAIR MANUAL
™
275429_2LC_.1875_Spine 3/29/06 11:11 AM Page 1
For Briggs & Stratton Discount Parts Call 606-678-9623 or 606-561-4983
www.mymowerparts.com

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine
MODEL 473100
2 CYLINDER LIQUID COOLED ENGINE
COMMERCIAL POWER
MANUAL NUMBER: 275429

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine
SAFETY INFORMATION
The Briggs & Stratton engine is made of the finest
material in a state-of-the-art manufacturing facility.
Please understand that Briggs & Stratton sells engines
to original equipment manufacturers. It also sells to
others in the distribution chain who may sell to the
ultimate consumer, an equipment manufacturer, another
distributor or a dealer. As a result, Briggs & Stratton does
not necessarily know the application on which the engine
will be placed. For that reason, carefully read and
understand the operating instructions of the equipment
before you repair or operate.
You should also understand that there are equipment
applications for which Briggs & Stratton does not
approve the useof its engines. Briggs & Stratton engines
are not to be used on vehicles with less than 4 wheels.
This includes motor bikes, aircraft products and all
terrain vehicles. Moreover, Briggs & Stratton does not
approve of its engines being used in competitive events.
FOR THAT REASON, BRIGGS & STRATTON
ENGINES ARE NOT AUTHORIZED FOR ANY OF
THESE APPLICATIONS. Failure to follow this warning
could result in death, serious injury (including paralysis)
or property damage.
IN THE INTEREST OF SAFETY
The safety alert symbol ( ) is used to identify safety
information about hazards that can result in personal
injury.
A signal word (DANGER, WARNING, or CAUTION) is used
with the alert symbol to indicate the likelihood and the
potential severity of injury. In addition, a hazard symbol
may be used to represent the type of hazard.
DANGER indicates a hazard which, if not
avoided, will result in death or serious injury.
WARNING indicates a hazard which, if not
avoided, could result in death or serious injury.
CAUTION indicates a hazard which, if not
avoided, might result in minor or moderate injury.
CAUTION: When this signal word is used without the
alert symbol, it indicates a situation that could result in
damage to the engine.
• Prior to work, read and understand the section(s) of
this manual that pertain to the job. Follow all safety
warnings.
• Wear suitable eye protection.
• Prevent accedental starting by removing spark plug
wire from spark plug when servicing engine or
equipment. Disconnect negative battery terminal if
equipped with electric starting system.
• Periodically clean engine. Keep governor parts free
of dirt, grass and other debris which can affect
engine speed.
• Always use fresh gasoline. Stale fuel can gum
carburetor and cause leakage.
• Check fuel lines and fittings frequently for cracks or
leaks and replace if necessary.

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine
Table Of Contents
Page 1
MODEL 473100
2 CYLINDER LIQUID COOLED ENGINE
COMMERCIAL POWER .........................................1
SAFETY INFORMATION .......................................2
IN THE INTEREST OF SAFETY...................... 2
SECTION 1
GENERAL INFORMATION .................................... 3
ENGINE IDENTIFICATION ..............................4
MAINTENANCE SCHEDULE ...........................5
FUEL AND OIL RECOMENDATIONS ..............6
CHANGING OIL AND OIL FILTER................... 7
CHANGE COOLANT ........................................7
CLEANING DEBRIS .........................................8
ADJUST FAN BELT .........................................8
AIR CLEANER MAINTENANCE ......................8
REPLACE SPARK PLUG .................................9
SECTION 2
TROUBLESHOOTING .........................................11
GENERAL INFORMATION ............................11
WILL NOT START ..........................................11
STARTER CURRENT DRAW TEST ..............12
NO LOAD
STARTER CURRENT DRAW TEST ..............13
CHECK CARBURETION ................................16
FUEL SHUT-OFF SOLENOID ........................16
FUEL PUMP - GENERAL INFORMATION ....17
CYLINDER BALANCE TEST .........................18
CYLINDER LEAKDOWN TEST ......................19
CHECKING COOLING SYSTEM ...................21
CHECK OIL PRESSURE SWITCH ................22
CHECK OIL PRESSURE ...............................23
CHARGING SYSTEM .....................................23
BATTERY INFORMATION .............................25
EQUIPMENT
AFFECTING ENGINE OPERATION ...............26
SECTION 3
ENGINE DISASSEMBLY ......................................27
GENERAL INFORMATION .............................27
REMOVE MUFFLER .......................................27
REMOVE RADIATOR .....................................27
DISCONNECT FUEL LINES ...........................28
REMOVE FAN ASSEMBLY ............................28
REMOVE CARBURETOR ..............................29
REMOVE STARTER .......................................30
REMOVE INTAKE MANIFOLD .......................31
REMOVE ALTERNATOR ...............................32
REMOVE CYLINDER HEADS ........................32
REMOVE CRANKCASE COVER ...................33
REMOVE CAMSHAFT ....................................34
REMOVE PISTONS, RODS, CRANKSHAFT .34
SECTION 4
ENGINE OVERHAUL ............................................35
CHECK CYLINDER ........................................35
BEARINGS ......................................................37
CRANKSHAFT ................................................38
PISTON, RINGS AND CONNECTING ROD
DISASSEMBLY AND INSPECTION ...............38
CYLINDER HEAD
INSPECTION AND REPAIR ...........................41
OIL PUMP .......................................................44
REPLACING WATER PUMP SEAL ................45
REPLACING STARTER SOLENOID ..............46

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine
Table Of Contents
Page 2
REPLACING PINION GEAR ASSEMBLY ......47
CARBURETOR INSPECTION AND REPAIR .51
SECTION 5
ENGINE ASSEMBLY ............................................57
INSTALL CRANKSHAFT ................................57
ASSEMBLE
PISTON AND CONNECTING ROD ................57
ASSEMBLE PISTON RINGS TO PISTON .....57
INSTALL
PISTON AND CONNECTING ROD ................58
INSTALL CAMSHAFT ....................................59
INSTALL GOVERNOR GEAR ........................59
INSTALL CRANKCASE COVER ....................59
INSTALL STARTER .......................................60
INSTALL ALTERNATOR ................................60
INSTALL FLYWHEEL .....................................61
INSTALL CYLINDER HEADS .........................61
INSTALL ROCKER ARMS .............................61
ADJUST VALVE CLEARANCE ......................62
INSTALL ARMATURES ..................................62
INSTALL FAN ASSEMBLY .............................63
INSTALL INTAKE MANIFOLD ........................64
INSTALL CARBURETOR AND INTAKE ELBOW
ASSEMBLY ....................................................64
ADJUST GOVERNOR ....................................66
INSTALL MUFFLER .......................................66
INSTALL RADIATOR ......................................67
INSTALL AIR CLEANER ASSEMBLY ............67
SECTION 6
FINAL ADJUSTMENTS AND
SPECIFICATIONS ................................................ 71
GENERAL INFORMATION ............................ 71
REMOTE GOVERNOR CONTROLS.............. 71
CARBURETOR ADJUSTMENT ..................... 72
MODEL 473100 SPECIFICATIONS ............... 75
ENGINE HARNESS ....................................... 77

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine
Section 1 - General Information
Page 3
SECTION 1 GENERAL INFORMATION
BRIGGS & STRATTON NUMERICAL IDENTIFICATION SYSTEM
This chart explains the unique Briggs & Stratton numerical model designation system. It is possible to determine most of the important
mechanical features of the engine by merely knowing the model number. Here is how it works:
• A. The first one or two digits indicate the approximate CUBIC INCH DISPLACEMENT.
• B. The first digit after the displacement indicates the BASIC DESIGN SERIES, relating to cylinder construction, ignition, general
configuration, etc.
• C. The second digit after the displacement indicates ORIENTATION OF CRANKSHAFT.
• D. The third digit after the displacement indicates TYPE OF BEARINGS, and whether or not the engine is equipped with
REDUCTION GEAR or AUXILIARY DRIVE.
• E. The last digit indicates the TYPE OF STARTER.
BRIGGS & STRATTON MODEL NUMBERING SYSTEM
First Digit
After Displalcement Second Digit
After Displalcement Third Digit
After Displalcement Fourth Digit
After Displalcement
ABCDE
Cubic Inch
Displacement Basic
Design Series PTO Bearing
Reduction Gear,
Auxiliary Drive,
Lubrication
Crankshaft
Orientation Type of
Starter
Plain Bearing/DU
Non-Flange Mount
Plain Bearing
Flange Mount
Sleeve Bearing
Flange Mounting
Splash Lube
Ball Bearing
Flange Mounting
Splash Lube
Ball Bearing
Flange Mounting
Pressure Lubrication
Plain Bearing
Gear Reduction
(6-1) CCW Rotation
Flange Mounting
Plain Bearing
Gear Reduction
(2-1) CCW Rotation
Plain Bearing
Pressure Lubrication
Plain Bearing
AuxiliaryDrive(PTO)
Perpendicular to
Crankshaft
Plain Bearing
AuxiliaryDrive(PTO)
Parallel to
Crankshaft
Plain Bearing
Pressure Lubrication
Without Oil Filter
0 -
1 -
2 -
3 -
4 -
5 -
6 -
7 -
8 -
9 -
A -
Example - To Identify Model 303447:
30
30 Cubic Inch 3
Design Series 3 4
Horizantal Shaft
0
1
2
3
4
5
6
7
8
9
A to Z
6
8
9
10
11
12
13
16
18
19
20
21
22
23
24
25
28
29
30
31
32
35
38
40
42
43
44
46
47
52
54
58
0 to 4 - Horizantal Shaft
5 to 9 - Verticle Shaft
A to G - Horizantal Shaft
H to z - Verticle Shaft
Without Starter
Rope Starter
Rewind Starter
Electric Starter Only
110 or 230 Volt Gear
Drive
Electric Starter/110
or 230 Volt Gear
Drive with Alternator
Electric Starter Only
12 or 24 Volt Gear
Drive
Alternator Only
Electric Starter 12 or
24 Volt Gear Drive
with Alternator
Verticle Pull Starter
or Side Pull Starter
Mechanical Starter
Electric Starter 12 or
24 Volt Gear Drive
with Alternator and
Inverter
0 -
1 -
2 -
3 -
4 -
5 -
6 -
7 -
8 -
9 -
A -
4
Horizantal Shaft
Flange Mounting
Pressure Lubrication
7
Electric Starter
12 or 24 Volt Gear Drive
with Alternator
TYPE 1234-01 The type number identifies the engine mechanical parts, color of paint, decals, goverened speed and original Equipment Manufacturer.
Code 01061201 The code is the manufacturing dat and is read as follows:
Year
01 MONTH
06 DAY
12 ASSEMBLY LINE AND MANUFACTURING PLANT

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine
Section 1 - General Information
Page 4
ENGINE IDENTIFICATION
Fig. 1
Oil Fill Cap
Dipstick
Spark Plug
12V Electric Starter
Oil Drain Plug
Fan Belt (If Equipped)
Fuel Filter
Radiator Drain Plug (If Equipped)
Radiator Screen & Handle (If Equipped)
Radiator & Radiator Cap (If Equipped)
Air Cleaner (If Equipped)
Fuel Pump
Muffler (If Equipped)
Choke Control
Throttle Control (2 Possible Locations)
Radiator Reservoir (If Equipped)
Oil Filter
Oil Drip Tray (Igf Equipped)
Oil Pressure Switch
Engine Model Label
MODEL TYPE CODE
xxxxxx xxxx xx xxxxxxxx

VanguardTM Twin-Cylinder OHV Liquid-Cooled Engine
Section 1 - General Information
Page 5
Change oil after first 50 hours of use, then every
100 hours or every season. Change oil every 50
hours when operating the engine under heavy load orin
high temperatures.
Clean more often under dusty conditions or when
airborne debris is present. Replace air cleaner
parts, if very dirty.
If an extended life coolant is used, interval may be
increased to once every 3000 hours.
MAINTENANCE SCHEDULE
Daily 50 Hours 100 Hours 250 Hours 600 Hours Yearly
Check Oil
Level X
Check For Oil
Leaks X
Change Oil X*
Change Oil
Filter X*
Check
Coolant
Change
Coolant XX***
Check Fan
Belt X
Clean Air
Filter X**
Replace Air
Filter X**
Check Valve
Clearance X
Check
Battery
Electrolyte
X
Change
Spark Plugs X
Change Fuel
Filter X
Clean Spark
arrestor X
*
**
***