272144 Vanguard Twin Cylinder OHV BRIGGS & STRATTON.pdf

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GASEOUS FUEL CARBURETOR ADJUSTMENT Some Briggs & Stratton V-<strong>Twin</strong> engines were available factory-built to operate on liquefied petroleum gas (LPG) or natural gas (NG). To maintain the California Air Resource Board (CARB) emissions certification on these engines, the Original Equipment Manufacturer (OEM) must use specific equipment and procedures to complete the installation. The following describes the OEM requirements. Always have a certified LPG/NG technician perform repairs on gaseous fuel systems. Fig. 58 NOTE: The main adjustment is the large brass adjustment screw (1) just to the left of the solenoid (2) and capped port (3), Fig. 58. The idle adjustment is located below and to the left of the main adjustment. An accurate CO meter is required to adjust the gaseous fuel mixture. 1. Start the engine. Set the main mixture adjustment at high speed under load to achieve 1/2 – 1% CO in the exhaust. 2. Allow the engine to warm up at top speed for 2 minutes. 3. Slow the engine to between 1100 – 1750 no-load RPM. Adjust the idle mixture to achieve 1/2 – 1% CO in the exhaust. 4. Return the engine to high speed full-load. If required, readjust the setting to 1/2 – 1% CO. 5. Stop the engine. Install the anti-tampering plugs. LPG-Only Operation NOTE: If the application is designed so that the engine normally operates on NG, but defaults to LPG if the NG supply is interrupted, no adjustments for LPG operation are required. The following steps describe the setting procedure when the engine is ONLY powered by LPG. 1. Follow steps 1 through 4 above. The same components (regulators, lock-off, fuel lines, etc.) used with the NG installation are used for the LPG installation. 2. Connect the fuel transfer solenoid to a 12 volt DC power supply. As an alternative the main adjustment screw may be turned in until completely seated eliminating the need for applying power to the solenoid. 3. Start the engine and run it at top speed for 2 minutes to warm up. The engine uses a fixed main jet for LPG operation, no adjustment is necessary. 4. Slow the engine to 1100 – 1750 RPM no-load. Adjust the idle mixture to achieve a reading of up to 3% CO. 5. Stop the engine. Install the anti-tampering plugs. 63
EQUIPMENT PROBLEMS AFFECTING ENGINE OPERATION Frequently, what appears to be an engine problem may be the fault of the equipment powered rather than the engine itself. Since many types of equipment are powered by Briggs & Stratton engines, it is impossible to list all the conditions that can exist. Listed below are some common equipment problems, and what to look for as the probable cause. Hard Starting or Will Not Start 1. Loose belt or blade – a loose belt or blade can cause a backlash effect that will counteract engine cranking effort. 2. Starting under load – be sure the unit is disengaged when engine is started; if the unit remains engaged, it should not have a heavy load when starting. 3. Check remote control assembly for proper adjustment. 4. Check interlock system for shorted wires, loose or corroded connections, or defective modules or switches. Engine Will Not Stop 1. Check equipment ignition stop switch. 2. Check for loose or disconnected equipment stop switch wire. 3. Check ground wire harness (current style) or ground terminal (early style) on engine. See test procedure. Vibration 1. Cutter blade bent or out of balance – remove and balance. 2. Mounting bolts loose – tighten bolts. Power Loss 1. Bind or drag in unit – If possible, disengage engine. Operate unit manually to check for binding. 2. Grass cuttings built-up under deck. 3. No lubrication in transmission or gear box. 4. Excessive drive belt tension may cause seizure. Noise 1. Cutter blade coupling or pulley – an oversize or worn coupling can result in knocking, usually under acceleration. Check for fit or tightness. 2. No lubricant in transmission or gear box. 64
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www.mymowerparts.com For Briggs & S
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IN THE INTEREST OF SAFETY DANGER FO
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WARNING Engines give off carbon mon
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BRIGGS & STRATTON MODEL NUMBERING S
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Oil Recommendations Oil has four pu
Page 11 and 12:
CAUTION: DO NOT use petroleum solve
Page 13 and 14: ÌÌ ÌÌ Fig. 8 ÌÌ Fig.
Page 15 and 16: NOTE: Idle speed may vary according
Page 17 and 18: Remove deposits from combustion cha
Page 19 and 20: The crankcase capacity of Vanguard
Page 21 and 22: 5. Turn fixed speed adjustable cont
Page 23 and 24: Fig. 43 Fig. 45 Oil Cooler 7. With
Page 25 and 26: TUNE-UP PROCEDURE A “Tune-Up,”
Page 28 and 29: Section 2 Troubleshooting Page ELEC
Page 30 and 31: Fouled Plug or Dead Cylinder To tes
Page 32 and 33: Fig. 6 4. Ground the other spar
Page 34 and 35: Charging System Identification Tabl
Page 36 and 37: Testing Alternator Output When test
Page 38 and 39: A Fig. 14 Fig. 15 NOTE: Serv
Page 40 and 41: The battery is not used for the lig
Page 42 and 43: Output Test WHEN CHECKING ALTERNATO
Page 44 and 45: 7. If NO or LOW output is found, be
Page 46 and 47: POWERLINK SYSTEM Some V-Twin engine
Page 48 and 49: If the previous tests have not reve
Page 50 and 51: Installation 1. Before installing b
Page 52 and 53: 3. Attach BLACK test lead to a good
Page 54 and 55: Oil Pressure Test Switch Use Digit
Page 56 and 57: Wiring Diagram For Starter Panel &
Page 58 and 59: 6. Insert BLACK test lead into COM
Page 60 and 61: Governor Test Dynamic Check Perform
Page 62 and 63: GASEOUS FUELED ENGINES TROUBLESHOOT
Page 66 and 67: Section 3 Engine Disassembly Page A
Page 68 and 69: 21 14 18 20 14 15 16 17 18 19 20 21
Page 70 and 71: Î Î Fig. 4 Horizontal Cranksh
Page 72 and 73: Remove Flywheel Fig. 13 Flywheel Nu
Page 74 and 75: Remove Breather and Starter Motor 1
Page 76 and 77: Section 4 Fuel Systems and Carburet
Page 78 and 79: NOTE: Install the supports over the
Page 80 and 81: Fuel Filter Replace the inline fuel
Page 82 and 83: NOTE: The inspection in Step 2 is p
Page 84 and 85: Fig. 30 Fig. 32 ÎÎÎÎ ÔÔÔ Ô
Page 86 and 87: 21. Position bowl drain as shown. 2
Page 88 and 89: NOTE: The top and bottom edges of t
Page 90 and 91: NOTE: Use LOCTITE® 222 on screw th
Page 92 and 93: Fixed Main Jet Sizes Model 351700 L
Page 94 and 95: Inspect Carburetor Inspect all part
Page 96 and 97: 3. Remove float and inlet needle.
Page 98 and 99: Inspect Carburetor Inspect all part
Page 100 and 101: Check Throttle, Choke Shaft and Bod
Page 102 and 103: ÒÒ ÒÒ ÒÒ Fig. 103
Page 104 and 105: CAUTION: DO NOT press on float to a
Page 106 and 107: Remove Carburetor from Manifold Rem
Page 108 and 109: NOTE: Parts containing rubber, such
Page 110 and 111: Aisan Carburetor Model 610000 Gener
Page 112 and 113: NOTE: Use LOCTITE 222 on screw thr
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Section 5 Governor Page GENERAL INF
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3. Loosen governor lever nut (3). 4
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2. If necessary, remove the governo
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Section 6 Cylinder Heads and Valves
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5. Remove intake and exhaust valves
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1. Measure valve stem diameter appr
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Section 7 Starters Page GENERAL INF
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C-Ring Style Disassemble CAUTION
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4. Remove end cap and brush retaine
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Brush retainers can be made from Pa
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Pinion Gear Pinion gear replacement
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Fig. 40 Assemble Pinion Gear 1. Lub
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REWIND STARTER IDENTIFICATION Two r
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ÓÓÓ ÓÓÓ 5. Carefully lift
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ÓÓ ÓÓ ÓÓÓÓÓÓÓÓ ÓÓÓÓ
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Section 8 Lubrication Systems Page
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CRANKCASE BREATHER SERVICE Models 2
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Models 540000, 610000 1. Remove two
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Section 9 Cylinders and Crankcase C
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NOTE: Recondition the cylinder bore
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Insert Bushing Driver #19349 into b
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Section 10 Crankshafts and Camshaft
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INSPECT CAMSHAFT Inspect gear teeth
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Section 11 Pistons, Rings and Conne
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Models 540000, 610000 • Top Compr
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Section 12 Engine Assembly Page ENG
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3. Align timing marks on camshaft a
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Fig. 13 2. Install valve covers wit
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Install Armatures 1. Assemble armat
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ÑÑ ÑÑ Fig. 29 a. Be sure lo
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4. Install breather deflector (4) a
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Final Engine Assembly • Install m
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Section 13 Engine Specifications Pa
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Torque Values Description Torque Ai
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Torque Values Description Air Clean
Page 188 and 189:
Starter Motor Support Block A start
Page 190 and 191:
Drill Size - Decimal Equivalent (In
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272144 Vanguard Twin Cylinder OHV BRIGGS & STRATTON.pdf

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