272144 Vanguard Twin Cylinder OHV BRIGGS & STRATTON.pdf

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Section 11 Pistons, Rings and Connecting Rods Page ASSEMBLE PISTON AND CONNECTING ROD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 ASSEMBLE RINGS TO PISTON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162 DISASSEMBLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 INSPECT PISTON AND PISTON RINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 INSPECT PISTON PIN AND CONNECTING ROD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 159
GENERAL INFORMATION Install new piston rings whenever the engine is disassembled for major servicing or overhaul, providing that cylinder bores are within specification. 1. Remove any carbon or ridge at the top of the cylinder bore. This will prevent breaking the rings when removing the piston and connecting rod from the engine. 2. Remove the connecting rod cap. Push the piston and connecting rod out through the top of the cylinder. 3. Measure cylinder bores before checking pistons and rings. If cylinder bores require re-sizing it is not necessary to check pistons and rings, since a new oversized piston assembly will be used. Resize a cylinder bore if it is more than 0.003” (0.08 mm) oversize, or 0.0015” (0.04 mm) out of round. Disassemble 1. Remove piston rings using Ring Expander #19340 (1), Fig. 1. 2. Remove oil control ring coil expander and oil control rings. Fig. 2 Inspect Piston and Piston Rings NOTE: If the cylinder is not going to be resized and the piston shows no signs of scoring, the piston should be checked. 1. Check side clearance of ring grooves using a feeler gauge and NEW piston rings (3), Fig. 3. Replace the piston if the ring groove is worn beyond specification. Side Clearance Reject Dimension: All Except Models 540000, 610000 • Compression Rings – 0.004” (0.10 mm) • Oil Rings – 0.008” (0.20 mm) Models 540000, 610000 • Top Compression Ring – 0.009” (0.23 mm) • Center Compression Ring – 0.006” (0.15 mm) • Oil Rings – 0.004” (0.10 mm) Fig. 1 3. Disassemble piston from connecting rod, Fig. 2. a. Remove piston pin locks (2). b. Piston pin is a slip fit in piston and connecting rod. Keep pistons and connecting rods together as an assembly. Do not mix. Fig. 3 2. Check ring end gap, Fig. 4. Clean carbon from end of rings and insert approximately 1” (25 mm) into cylinder. End Gap Reject Dimension All Except Models 540000, 610000 • All Rings – 0.030” (0.76 mm) 160
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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
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CAUTION: DO NOT use petroleum solve
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ÌÌ ÌÌ Fig. 8 ÌÌ Fig.
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NOTE: Idle speed may vary according
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Remove deposits from combustion cha
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The crankcase capacity of Vanguard
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5. Turn fixed speed adjustable cont
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Fig. 43 Fig. 45 Oil Cooler 7. With
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TUNE-UP PROCEDURE A “Tune-Up,”
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Section 2 Troubleshooting Page ELEC
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Fouled Plug or Dead Cylinder To tes
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Fig. 6 4. Ground the other spar
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Charging System Identification Tabl
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Testing Alternator Output When test
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A Fig. 14 Fig. 15 NOTE: Serv
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The battery is not used for the lig
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Output Test WHEN CHECKING ALTERNATO
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7. If NO or LOW output is found, be
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POWERLINK SYSTEM Some V-Twin engine
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If the previous tests have not reve
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Installation 1. Before installing b
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3. Attach BLACK test lead to a good
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Oil Pressure Test Switch Use Digit
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Wiring Diagram For Starter Panel &
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6. Insert BLACK test lead into COM
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Governor Test Dynamic Check Perform
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GASEOUS FUELED ENGINES TROUBLESHOOT
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GASEOUS FUEL CARBURETOR ADJUSTMENT
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Section 3 Engine Disassembly Page A
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21 14 18 20 14 15 16 17 18 19 20 21
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Î Î Fig. 4 Horizontal Cranksh
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Remove Flywheel Fig. 13 Flywheel Nu
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Remove Breather and Starter Motor 1
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Section 4 Fuel Systems and Carburet
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NOTE: Install the supports over the
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Fuel Filter Replace the inline fuel
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NOTE: The inspection in Step 2 is p
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Fig. 30 Fig. 32 ÎÎÎÎ ÔÔÔ Ô
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21. Position bowl drain as shown. 2
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NOTE: The top and bottom edges of t
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NOTE: Use LOCTITE® 222 on screw th
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Fixed Main Jet Sizes Model 351700 L
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Inspect Carburetor Inspect all part
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3. Remove float and inlet needle.
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Inspect Carburetor Inspect all part
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Check Throttle, Choke Shaft and Bod
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ÒÒ ÒÒ ÒÒ Fig. 103
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CAUTION: DO NOT press on float to a
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Remove Carburetor from Manifold Rem
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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
Page 114 and 115: Section 5 Governor Page GENERAL INF
Page 116 and 117: 3. Loosen governor lever nut (3). 4
Page 118 and 119: 2. If necessary, remove the governo
Page 120 and 121: Section 6 Cylinder Heads and Valves
Page 122 and 123: 5. Remove intake and exhaust valves
Page 124 and 125: 1. Measure valve stem diameter appr
Page 126 and 127: Section 7 Starters Page GENERAL INF
Page 128 and 129: C-Ring Style Disassemble CAUTION
Page 130 and 131: 4. Remove end cap and brush retaine
Page 132 and 133: Brush retainers can be made from Pa
Page 134 and 135: Pinion Gear Pinion gear replacement
Page 136 and 137: Fig. 40 Assemble Pinion Gear 1. Lub
Page 138 and 139: REWIND STARTER IDENTIFICATION Two r
Page 140 and 141: ÓÓÓ ÓÓÓ 5. Carefully lift
Page 142 and 143: ÓÓ ÓÓ ÓÓÓÓÓÓÓÓ ÓÓÓÓ
Page 144 and 145: Section 8 Lubrication Systems Page
Page 146 and 147: CRANKCASE BREATHER SERVICE Models 2
Page 148 and 149: Models 540000, 610000 1. Remove two
Page 150 and 151: Section 9 Cylinders and Crankcase C
Page 152 and 153: NOTE: Recondition the cylinder bore
Page 154 and 155: Insert Bushing Driver #19349 into b
Page 156 and 157: Section 10 Crankshafts and Camshaft
Page 158 and 159: INSPECT CAMSHAFT Inspect gear teeth
Page 162 and 163: Models 540000, 610000 • Top Compr
Page 164 and 165: Section 12 Engine Assembly Page ENG
Page 166 and 167: 3. Align timing marks on camshaft a
Page 168 and 169: Fig. 13 2. Install valve covers wit
Page 170 and 171: Install Armatures 1. Assemble armat
Page 172 and 173: ÑÑ ÑÑ Fig. 29 a. Be sure lo
Page 174 and 175: 4. Install breather deflector (4) a
Page 176 and 177: Final Engine Assembly • Install m
Page 178 and 179: Section 13 Engine Specifications Pa
Page 180 and 181: Torque Values Description Torque Ai
Page 186 and 187: 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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