272144 Vanguard Twin Cylinder OHV BRIGGS & STRATTON.pdf

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Section 13 Engine Specifications Page ENGINE SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 Models 290000, 300000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 Model 350000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180 Model 380000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182 Models 540000, 610000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184 Honing Fixture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 Starter Motor Support Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187 Starter Motor Test Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187 Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188 Fuel System Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188 Carburetor Main Jets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188 Reference Pressures – Gaseous Fuel Engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188 Diode Failure Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188 Crankshaft Grinding Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188 Drill Size – Decimal Equivalents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189 English to Metric Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190 177
Models 290000, 300000 Common Specifications NOTE: All dimensions in Inches (Millimeters) Armature Air Gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.008 – 0.012 (0.20 – 0.30) Crankshaft End Play . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.002 – 0.030 (0.05 – 0.76) Spark Plug Gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.030 (0.76) Valve Clearance – Measured Cold Intake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.004 – 0.006 (0.10 – 0.15) Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.004 – 0.006 (0.10 – 0.15) Dimensional Specifications NOTE: All dimensions in Inches (Millimeters) Description Standard Dimension Reject Dimension <strong>Cylinder</strong> Bore Models 290000 & 303000 . . . . . . . . . . . . . . 2.677 – 2.678 (68.00 – 68.03) . . . . . . . . . . . . . . . . 2.681 (68.10) Out-of-round . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.002 (0.05) Main Bearing Before 970501100 . . . . . . . . . . . . . . . . . . . . 1.182 – 1.183 (30.03 – 30.06) . . . . . . . . . . . . . . . . 1.184 (30.08) After 97043000 . . . . . . . . . . . . . . . . . . . . . . . 1.379 – 1.380 (35.02 – 35.06) . . . . . . . . . . . . . . . . 1.383 (35.12) Cam Bearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.630 – 0.631 (16.00 – 16.03) . . . . . . . . . . . . . . . . 0.633 (16.08) <strong>Cylinder</strong> Head Valve Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2366 – 0.237 (6.01 – 6.02) . . . . . . . . . . . . . . . . . 0.238 (6.05) Valve Stem– Intake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.234 – 0.235 (5.95 – 5.96) . . . . . . . . . . . . . . . . . . 0.233 (5.92) Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2338 – 0.234 (5.94 – 5.95) . . . . . . . . . . . . . . . . . 0.2327 (5.91) Crankcase Cover Main Bearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3795 – 1.380 (35.04 – 35.05) . . . . . . . . . . . . . . . 1.381 (35.07) Cam Bearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.7874 – 0.788 (20.0 – 20.02) . . . . . . . . . . . . . . . . 0.789 (20.04) Crankshaft Crankpin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4567 – 1.458 (37.00 – 37.03) . . . . . . . . . . . . . . . 1.455 (36.95) Magneto Journal Before 9705010 . . . . . . . . . . . . . . . . . . . . . . 1.180 – 1.181 (29.98 – 30.00) . . . . . . . . . . . . . . . . 1.179 (29.94) After 97043000 . . . . . . . . . . . . . . . . . . . . . . . 1.376 – 1.378 (34.95 – 35.00) . . . . . . . . . . . . . . . . 1.376 (34.95) PTO Journal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.376 – 1.377 (34.95 – 34.98) . . . . . . . . . . . . . . . . 1.375 (34.92) Throw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.444 – 1.447 (36.66 – 36.74) Camshaft Magneto Journal . . . . . . . . . . . . . . . . . . . . . . . . . . 0.628 – 0.629 (15.95 – 15.97) . . . . . . . . . . . . . . . . 0.627 (15.93) PTO Journal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.785 – 0.7854 (19.94 – 19.95) . . . . . . . . . . . . . . . 0.7843 (19.92) Lobes Intake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.194 – 1.202 (30.33 – 30.53) . . . . . . . . . . . . . . . . 1.191 (30.25) Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.194 – 1.202 (30.33 – 30.53) . . . . . . . . . . . . . . . . 1.191 (30.25) Connecting Rod Crankpin Bearing . . . . . . . . . . . . . . . . . . . . . . . . . . 1.459 – 1.460 (37.06 – 37.08) . . . . . . . . . . . . . . . . 1.461 (37.12) Piston Pin Bearing . . . . . . . . . . . . . . . . . . . . . . . . . 0.6728 – 0.6732 (17.09 – 17.10) . . . . . . . . . . . . . . 0.674 (17.12) Piston Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6720 – 0.6724 (17.07 – 17.08) . . . . . . . . . . . . . . 0.6717 (17.06) Piston Pin Bearing (Piston) . . . . . . . . . . . . . 0.6728 – 0.6732 (17.09 – 17.10) . . . . . . . . . . . . . . 0.674 (17.12) Piston Rings End Gap – Top, Center & Oil . . . . . . . . . . . . . . . . 0.008 – 0.016 (0.20 – 0.40) . . . . . . . . . . . . . . . . . . 0.030 (0.76) Side Clearance Top & Center Rings . . . . . . . . . . . . . . . . . . . 0.002 – 0.003 (0.05 – 0.08) . . . . . . . . . . . . . . . . . . 0.004 (0.10) Oil Control Rings . . . . . . . . . . . . . . . . . . . . . 0.0045 – 0.006 (0.11 – 0.15) . . . . . . . . . . . . . . . . . 0.008 (0.20) 178
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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
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Aisan Carburetor Model 610000 Gener
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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
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
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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 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 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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