272144 Vanguard Twin Cylinder OHV BRIGGS & STRATTON.pdf

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NOTE: Recondition the cylinder bores to restore the crosshatch finish whenever new piston rings are installed to a cylinder that is within specification. Be careful not to hone the cylinder oversize or it will be necessary to resize the cylinder. Lubricate hone as recommended by hone manufacturer. The recommended drill speed is 300 – 700 RPM and 40 - 60 strokes per minute. Because cylinder bores normally wear only in the area of ring travel (3), the cylinder bore will be round above and below ring travel area, Fig. 3 (B). Start drill and, as hone spins, move it up and down (7) at the bottom of the cylinder bore (4). Gradually increase the length of the strokes until hone travels full length of cylinder bore (8), but no more than 3/4 – 1” (19 – 25 mm) above or below (6) cylinder bore, Fig. 3 (C). Lubricate hone frequently to prevent build up on stones. As cutting tension decreases, stop hone and tighten adjusting knob following hone manufacturer’s recommendations. Check cylinder bore frequently. Finishing Finishing stones are used after the cylinder bore has been resized to within 0.0015” (0.04 mm) of the desired size or when reconditioning a cylinder bore. The finishing stones will produce the correct crosshatch finish necessary for proper lubrication. The correct crosshatch angle is approximately 45º (1), Fig. 4. Recondition the cylinder bores to restore the finish when new piston rings are to be installed in a cylinder that is within specification. Do not to hone oversize or it will be necessary to resize the cylinder. NOTE: To produce the proper crosshatch finish use a drill speed of approximately 200 RPM and 40 - 60 strokes per minute. Lubricate hone liberally to prevent build up on finishing stones. A B C ÓÓÓ ÓÓÓ ÓÓÓ ÓÓÓ ÓÓÓ ÔÔ ÓÓÓÓ ÓÓÓ ÓÓ ÓÓÓÓ ÓÓÓ ÓÓ ÓÓÓÓ ÓÓ ÓÓÓÓ ÔÔ ÓÓÓ ÔÔÓÓÓ ÔÔ ÓÓÓ ÔÔ ÓÓÓ ÔÔ ÓÓÓ ÔÔ ÔÔ ÔÔ ÓÓÓ ÔÔ ÔÔ Fig. 3 Cleaning Fig. 4 CAUTION: Honing grit is highly abrasive and will cause rapid wear to all the internal components of the engine unless it is completely removed. The entire cylinder and crankcase MUST be THOROUGHLY cleaned after honing. First wash the cylinder and crankcase carefully in a solvent such as kerosene or commercial solvent. Then thoroughly wash cylinder and crankcase using a stiff brush with soap and hot water. Rinse thoroughly with hot running water. Repeat washing and rinsing until all traces of honing grit are gone. NOTE: When cylinder and crankcase have been thoroughly cleaned, use a clean white rag or napkin to wipe the cylinder bore. If honing grit is present it will appear as a gray residue on rag. If any honing grit is evident, re-wash and rinse entire cylinder and crankcase and check again. When there is no trace of honing grit on rag, the cylinder has been properly cleaned. Oil the cylinder bore to prevent rusting. 151
ENGINE BEARINGS Mag Bearing – After 970430xx Check 1. Check magneto bearing for damage. Check for wear at several locations using plug gauge #19219 (1) or appropriate measuring tools, Fig. 5. If plug gauge is not available see reject dimension in Section 13. 2. Replace bearing if damaged or worn. Fig. 7 4. Stake bearing in top notch (2) with 1/8” round pin punch to prevent bearing from turning, Fig. 8. Fig. 5 Remove 1. Remove the oil seal. 2. Insert Bushing Driver #19450 (1) into bearing from oil seal side, Fig. 6. 3. Place a reference mark (2) on driver to indicate proper depth when installing new bearing. Fig. 8 5. Install new oil seal with sealing lips facing in. Use Cylinder Support #19227. Press oil seal until flush with cylinder. Mag Bearing – Before 970501xx Check 1. Check magneto bearing for damage. Check for wear at several locations using #19380 plug gauge or appropriate measuring tools, Fig. 9. If plug gauge is not available see reject dimension in Section 13. 2. Replace bearing if damaged or worn. Fig. 6 4. Place cylinder on Cylinder Support #19227 with large opening facing bearing. 5. Press out bearing with bushing driver (1), Fig. 7. Install 1. Place cylinder on Cylinder Support #19227 with large opening facing bearing, Fig. 7. 2. Align oil holes in bearing with oil holes in cylinder. 3. Press in new bearing to correct depth with bushing driver (1). Fig. 9 152
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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
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
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 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 160 and 161: Section 11 Pistons, Rings and Conne
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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