Briggs & Stratton 276535 Repair Manual Download | Manualshive

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2-Cycle Snow Engine

Section 2 - Troubleshooting

Page 8

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Summary of Contents for 276535

Page 1: ...2 Cycle Snow Engine 0 2 CYCLE SNOW ENGINE REPAIR MANUAL MANUAL NUMBER 276535...

Page 2: ...roperty damage IN THE INTEREST OF SAFETY The safety alert symbol is used to identify safety information about hazards that can result in personal injury A signal word DANGER WARNING or CAUTION is used...

Page 3: ...2 Cycle Snow Engine ii...

Page 4: ...2 Cycle Snow Engine iii...

Page 5: ...s 7 STARTER MOTOR FAILS TO TURN 7 Power not reaching product 7 Starter switch malfunction 7 Engine has seized 7 Starter motor has failed 7 SECTION 3 ENGINE DISASSEMBLY 9 REMOVE SHROUD 9 REMOVE CARBURE...

Page 6: ...LL CRANKCASE COVER 25 INSTALL CYLINDER HEAD 25 INSTALL IGNITION COIL AND FLYWHEEL 25 INSTALL AIR VANE AND GOVERNOR 26 INSTALL INTAKE MANIFOLD AND CARBURETOR 27 CHECK GOVERNOR OPERATION 27 INSTALL MUFF...

Page 7: ...ding exhaust gases escape As the piston continues to move away from the spark plug it compresses the fuel mixture Item Figure 2 that is on the bottom side of the piston in the crankcase Fig 2 Near the...

Page 8: ...ed into the charge coil This AC voltage is converted by a rectifier into a DC signal which is then stored in a capacitor Figure 6 Fig 6 When the silicone controlled rectifier SCR is triggered up to 20...

Page 9: ...wheel The engagement dogs contact the starter hub when the rewind rope is pulled When the engine starts the starter cup exceeds the speed of the recoil starter causing the ramps on the inside of the c...

Page 10: ...Do not sand blast Use NGK BPMR 4A or equivalent Set spark plug gap Figure 11 at 028 032 in 71 81mm Torque spark plug to 150 200 lb in 17 23 Nm Fig 11 CLEANING THE EXHAUST SYSTEM 1 Remove the muffler...

Page 11: ...t method of determining the cause of failure Check Ignition With stop switch in ON RUN position and spark plug installed attach a 19368 ignition tester to the spark plug lead and ground the other end...

Page 12: ...pour a small quantity of fuel 1 teaspoon or 5 mil through the spark plug hole Replace the plug If the engine fires a few times and then stops look for the same conditions as for a dry plug Check Comp...

Page 13: ...itches Vibration Auger bent or out of balance Worn drive pulley s Mounting bolts loose Check for partially sheared flywheel key Power Loss Bind or drag in unit if possible disengage engine and operate...

Page 14: ...2 Cycle Snow Engine Section 2 Troubleshooting Page 8...

Page 15: ...r before removal from the engine 1 Remove fuel line and drain remove the fuel tank On some snow throwers it will be necessary to remove the lower shroud to access the carburetor and fuel line 2 Discon...

Page 16: ...e striking the flywheel nut with a soft mallet Figure 21 Fig 21 4 Remove key REMOVE OPTIONAL 120V STARTER 1 Remove the starter switch the bolt holding the wire clip and the two bolts which mount the s...

Page 17: ...nkshaft assembly and discard the oil seals 4 Carefully remove the cap screws Figure 26 5 Remove the connecting rod cap and the split bearing liner Fig 26 The needle roller bearings are under the split...

Page 18: ...Cycle Snow Engine Section 3 Engine Disassembly Page 12 9 Remove the two studs and two nuts Figure 28 retaining the cylinder head to the block Remove the head and discard the head gasket Fig 28 720 00...

Page 19: ...is distorted or cracked in any way Bearings 1 Check ball bearings for wear and freedom of movement replace if questionable Crankcase 1 Inspect the crankcase for cracks or any other indication of damag...

Page 20: ...ck piston for wear or damage Replace if questionable 6 Check piston pin bore Figure 35 using dial caliper 19199 Replace piston if bore is more than 501 in 12 72mm 7 Check piston diameter using a dial...

Page 21: ...he orientation of the small protrusions on the throttle plate as you pull it out Fig 38 2 Remove throttle shaft 3 Set the choke lever to the full open detent Figure 39 Fig 39 4 Using needle nose plier...

Page 22: ...ave Loctite on them 7 Remove the fuel filter screen from the fuel nozzle Figure 43 Fig 43 8 Remove the float hinge pin the inlet valve needle assembly with its clip and the float Figure 44 Discard the...

Page 23: ...h the plastic hose flush all passages 4 Blow dry all carburetor passages with compressed air 5 Ensure the carburetor mounting flange and the fuel bowl mounting flange are smooth and undamaged CARBURET...

Page 24: ...e without gasket to top of float Figure 50 Fig 50 9 Pressure check inlet needle and seat Attach pump 19493 with pressure gauge to fuel inlet fitting on carburetor Figure 51 With carburetor upside down...

Page 25: ...plate does not fit snugly replace the throttle shaft Rotate throttle shaft to ensure plate Figure 54 does not stick or bind Fig 54 14 Install the choke shaft into the carburetor body as shown in figu...

Page 26: ...nuts on top Rope Replacement 1 Remove shroud from engine see page 9 2 Ensure rope is 84 inches in length 3 Rotate rewind pulley counterclockwise 6 revolutions and align hole in pulley with hole in ho...

Page 27: ...ALL PISTON RINGS Always use a ring expander when installing piston rings Briggs Stratton 2 cycle engines have two different style piston and piston ring configurations depending on the engine model Fi...

Page 28: ...ne models 84230 and 84330 the transfer ports in the piston skirt must align with the finger ports these correspond with the transfer ports in the piston in the cylinder bore 1 Oil piston rings and pis...

Page 29: ...ip of paper and the needles will be coated with wax on one side Remove the paper and wrap needles around the crank pin with the wax towards the crankpin Wax will hold needles in place until connecting...

Page 30: ...ure 69 Fig 69 6 Install snap ring into groove behind PTO ball bearing Push down on snap ring so that it is seated in its groove Figure 70 Fig 70 INSTALL OIL SEALS NOTE Do not lubricate the seals Insta...

Page 31: ...rews and on PTO side 4 Torque screws in 25 lb in 3 Nm increments in letter sequence shown to 75 lb in 8 Nm figure 72 Fig 72 INSTALL CYLINDER HEAD 1 Install cylinder head with new gasket Figure 73 Ensu...

Page 32: ...8 Loosen mounting screw so magnet will pull ignition coil down against thickness gauge Torque screws to 90 lb in 10 0 Nm 9 Rotate flywheel to remove thickness gauge 10 Install ground wire assembly to...

Page 33: ...5 Install carburetor Torque screws to 25 lb in 2 8 Nm 6 Install governor spring Figure 81 NOTE Open ends of governor spring must face out Fig 81 CHECK GOVERNOR OPERATION The governor link may require...

Page 34: ...ING 1 Assemble a flat washer to each cylinder head bolt stud Figure 84 2 Make sure ground wire is routed between outer cylinder head fins Fig 84 3 Assemble blower housing to engine 4 Assemble ground w...

Page 35: ...stments Specifications Page 29 SECTION 6 FINAL ADJUSTMENTS SPECIFICATIONS GOVERNOR ADJUSTMENTS The governor is adjusted by bending the bracket that the governor spring is attached to Figure 87 See spe...

Page 36: ...NM FLYWHEEL 11 16 33 LB FT 44 7 NM HEAD BOLTS 1 2 180 LB IN 20 0 NM INTAKE MANIFOLD TO CYL PHILLIPS 60 LB IN 7 0 NM MUFFLER 1 2 80 LB IN 9 0 NM REWIND STARTER 5 16 20 LB IN 2 0 NM SPARK PLUGS 13 16 D...

Page 37: ...1 0 07MM 007 0 18MM CRANKSHAFT CRANKPIN 7425 743 18 86 18 87MM 7415 18 83MM MAGNETO JOURNAL BALL PTO JOURNAL BALL CONNECTING ROD CRANKPIN BEARING LOOSE ROLLER BEARINGS PISTON PIN BEARING CAGED ROLLER...

Page 38: ...2 Cycle Snow Engine Section 6 Final Adjustments Specifications Page 32...

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