272144 Vanguard Twin Cylinder OHV BRIGGS & STRATTON.pdf

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Fouled Plug or Dead Cylinder To test for a fouled spark plug or a non-functioning cylinder, attach Ignition Tester #19368 (2) between the spark plug lead (1) and each spark plug (4). With engine running at top no-load speed, use a screwdriver (3) with an insulated handle to ground one spark plug by contacting the alligator clip on the ignition tester to a good ground on the engine, Fig. 3. The engine should continue to run on the other cylinder. Repeat this test with the other cylinder. If the engine dies when performing this test, the cylinder that is NOT grounded is not functioning and/or the spark plug is fouled. Install a new spark plug and re-check. If miss continues see the following procedures. Carburetion Fig. 3 NOTE: Gaseous fuel engines use carburetors that must be serviced by a certified gaseous fuel installer or by a certified dealer for the equipment powered. Before performing a carburetion check, be sure the fuel tank has an ample supply of fresh, clean gasoline. Be sure that the shutoff valve, if equipped, is open and fuel flows freely through the fuel line before starting engine. Inspect and adjust the idle needle valve. Make sure the choke closes completely. If engine will not start, remove and inspect the spark plugs. If plugs are wet, look for – 1. Overchoking 2. Excessively rich fuel mixture 3. Water in fuel 4. Float needle valve stuck open 5. Plugged air cleaner If plugs are dry, look for – 1. Leaking carburetor mounting gaskets 2. Gummy or dirty carburetor, fuel line or tank 3. Float needle valve stuck shut 4. Inoperative fuel pump 5. Inoperative anti-afterfire solenoid To determine if fuel is getting to the combustion chamber through the carburetor, remove either spark plug and pour a small quantity of gasoline through the spark plug hole. Replace the spark plug. If the engine fires a few times and then stops, look for the same conditions as for a dry plug. Compression Compression Test Briggs & Stratton does not publish compression pressures, as it is difficult to obtain an accurate reading without special equipment. An assessment of the engine’s compression can be made as follows: Remove both spark plugs and insert a compression gauge into either cylinder (one cylinder at a time). Turn engine over with engine starter until there is no further increase in gauge pressure reading. Record this reading. Repeat procedure on other cylinder and record that reading. Divide the difference between the cylinders by the compression pressure of the higher of the two cylinders. A difference over 25% between the cylinders indicates a loss of compression in the cylinder with lower pressure. See example below. Engine #1 Engine #2 Cylinder #1 65 PSI 75 PSI Cylinder #2 60 PSI 55 PSI Difference 5 PSI 20 PSI % Difference 7.7% 26.7% If compression is poor, look for – 1. Loose cylinder head bolts 2. Blown head gasket 3. Burned valves, burned and/or loose valve seats 4. Insufficient valve clearance 5. Warped cylinder head 6. Warped valve stems 7. Worn bore and/or rings 8. Broken connecting rods 29
Cylinder Leakdown Test Use a leakdown tester to test the sealing capability of each cylinder. Follow the instructions for the leakdown tester you are using to determine the likely problem area(s). 1. Run engine for 5 minutes allowing engine to reach operating temperature. NOTE: If the engine is cold or cannot be started, air flow may be higher (gauge readings lower) because compression components are not at normal operating temperatures. 2. Remove spark plug from engine. Disconnect crankcase breather tube. 3. Rotate crankshaft in direction of operation until piston is at Top Dead Center (TDC) of the compression stroke. 4. Hold flywheel nut with socket and breaker bar. NOTE: Hold the crankshaft with the piston at TDC to minimize the chance of rotation. CAUTION AVOID INJURY! • Injury could occur if the crankshaft is allowed to rotate or if the engine is not securely fastened to a stand or to the application. 5. Connect tester to a shop air source with minimum air pressure of 70 psi (480 kPa). 6. Install outlet hose into spark plug hole of cylinder being tested. Insure O-ring is seated to prevent air leak at spark plug hole. Connect other end to tester. 7. While securely holding the flywheel nut with the breaker bar and socket, pull the adjustment knob OUT (arrow), Fig. 4. Slowly turn the regulator adjustment knob (1) CLOCKWISE until tester needle (2) is on the set point. Push in regulator adjustment knob. NOTE: Any air leaks at connections or fittings of tester will affect the accuracy of test. 8. Slowly open the valve and note the reading on the gauge. Fig. 4 Cylinder Balance Test If the engine starts hard, runs rough, misses or lacks power, perform a cylinder balance test to determine whether both cylinders are operating correctly. A cylinder balance test will also detect a cylinder that is not functioning. When grounding one cylinder there will be no RPM loss. When the other cylinder is grounded the engine will stop. • Tools Required: Tachometer #19200 Two @ Ignition Tester #19368 Screwdriver with insulated handle. 1. Attach Ignition Tester #19368 (2) between each spark plug lead (1) and spark plug (3), Fig. 5. Fig. 5 2. Start engine. Run at top no-load speed and note spark at ignition testers. If the spark is equal at both ignition testers, the problem is not ignition related. A spark miss should be readily apparent. 3. Note RPM of engine. Ground one cylinder with screwdriver (4) by contacting alligator clip on ignition tester to a good ground on engine, Fig. 6. Note RPM loss. 30
Page 1 and 2: www.mymowerparts.com For Briggs & S
Page 3 and 4: IN THE INTEREST OF SAFETY DANGER FO
Page 5 and 6: WARNING Engines give off carbon mon
Page 7 and 8: BRIGGS & STRATTON MODEL NUMBERING S
Page 9 and 10: 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 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 64 and 65: GASEOUS FUEL CARBURETOR ADJUSTMENT
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
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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
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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
Page 114 and 115:
Section 5 Governor Page GENERAL INF
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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
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5. Remove intake and exhaust valves
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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
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ÓÓÓ ÓÓÓ 5. Carefully lift
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ÓÓ ÓÓ ÓÓÓÓÓÓÓÓ ÓÓÓÓ
Page 144 and 145:
Section 8 Lubrication Systems Page
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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
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NOTE: Recondition the cylinder bore
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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
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Torque Values Description Torque Ai
Page 182 and 183:
Page 184 and 185:
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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