Briggs & Stratton 276535 - Manual

8 1 1 ENGINE MAINTENANCE Fuel and Oil Recommendations Fuel must meet these requirements: • Clean, fresh, unleaded gasoline. • A minimum of 87 octane / 87 AKI (90 RON). • Gasoline with up to 10% ethanol (gasahol) or up to 15% MTBE (methyl tertiary butyl ether) is acceptable. • NOTICE: Do not use unap...

9 1 1 Maintenance Chart * In dusty conditions or when airborne debris is present, clean more often. Flywheel Brake Model Series 97700, 99700, 110000, 120000 Vertical Shaft The flywheel brake is part of the safety control system required for some applications. While running at FAST speed position, th...

10 1 1 Figure 3 6. Using a torque wrench and socket to fit the flywheel nut, turn flywheel clockwise with brake engaged. While turning at a steady rate, torque reading should be 26 lb.-in. (3 Nm) or higher. 7. If reading is low, check thickness of brake pad. Replace brake assembly if thickness is le...

11 1 1 Combustion Chamber Remove combustion chamber deposits every 500 hours or whenever the cylinder head is removed.With the piston at Top Dead Center (TDC), scrape deposits from top of piston and upper bore with a plastic scraper.Remove the loosened deposits from around the top ring land area usi...

13 1 1 Figure 13 Figure 14 Snow Hood NOTE: Snow engines do not have an air cleaner assembly. Instead, a 1-piece or 2-piece snow hood is installed to protect the carburetor area, retain heat to resist carburetor icing, and provide a mounting surface for engine controls. Remove 1. Remove choke knob ( ...

15 1 1 Cooling System Dirt or debris can restrict air flow and cause the engine to overheat, resulting in poor performance and reduced engine life. Continued operation with a clogged cooling system can cause severe overheating and possible engine damage. Clean these areas yearly or more often when d...

16 1 1 ENGINE ADJUSTMENTS Remote Control Wire Travel The remote control wire should measure 2.125” (54 mm) when extended outside the casing (Figure 21). After installation, the travel of the remote control wire must be at least 1.375” (35 mm) to properly actuate the choke (on Choke-A-Matic® systems)...

18 1 1 Governor Adjustments A complete governor system adjustment includes a static adjustment, engine warm-up, idle and/or governed idle adjustment, and top no-load adjustment. Be sure to complete all steps. Static Adjustment 1. Loosen screw holding governor lever to governor crank ( A , Figure 28)...

21 1 1 2. Move equipment speed control to idle position. 3. Turn idle screw to obtain 1750 RPM minimum. 4. Then turn idle mixture screw clockwise slowly until engine begins to slow. 5. Then turn screw opposite direction until engine just begins to slow. 6. Then turn screw back to midpoint (Figure 39...

23 2 2 SECTION 2 - TROUBLESHOOTING SYSTEMS CHECK - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -25 CHECK IGNITION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ...

25 2 2 SYSTEMS CHECK Most complaints concerning engine operation can be classified as one or a combination of the following: • Will not start • Hard starting • Lack of power • Runs rough • Vibration • Overheating • High oil consumption The source of most of these symptoms can be determined by perfor...

26 2 2 2) Check Carburetion Before making a carburetion check, be sure the fuel tank has an ample supply of fresh, clean gasoline. Be sure the shutoff valve, if equipped, is open and fuel flows freely through the fuel line. If fuel fails to flow or is slow, check for plugged fuel cap vent, fuel line...

27 2 2 4. Turn key switch ON. Meter should display battery voltage. If meter does not display battery voltage, the problem is with the solenoid wiring, equipment wire harness, or the keyswitch. Repair or replace as required. 3) Check Compression Use Leakdown Tester #19545 to check the sealing capabi...

28 2 2 ELECTRICAL SYSTEMS Equipment Used for Testing Digital Multimeter A digital multimeter is recommended for all electrical testing of Briggs & Stratton engines. The meter can be used to read volts, ohms, amperes, and to test diodes. The Fluke® Digital Multimeter #19464 and the UNI-T® Digital...

30 2 2 Alternator Identification The alternator systems installed on Briggs & Stratton OHV Engines can easily be identified by the color of the stator output wires and the connector. *Alternator output is determined by the size of the flywheel alternator magnets. Alternator Type Stator Output Wi...

33 2 2 Flywheel Identification OHV single cylinder flywheels have a single ring of magnets which provide the magnetic field for the various alternator systems, except Model Series 97700, 99700, 121600, 126000 which use the magneto magnet. There are two sizes of flywheel magnets. The size of the magn...

34 2 2 5. Attach BLACK test lead clip to positive ( + ) battery terminal. NOTE: Negative ( - ) battery terminal must be grounded. Figure 17 6. With engine running at 3600 RPM, output should be between 2 to 4 Amps DC. • Output will vary with battery voltage. If battery voltage is at its maximum, outp...

35 2 2 Test Alternator Output 1. Insert RED test lead ( A , Figure 19) into the V Ω receptacle in the meter. 2. Insert BLACK test lead ( B ) into COM receptacle. 3. Rotate selector to AC Volts position. 4. Attach RED test lead clip to AC output terminal ( C ). 5. Attach BLACK test lead clip to engin...

36 2 2 Figure 21 6. With the engine running at 3600 RPM, output should be between 2 - 4 Amps DC. NOTE: The output will vary with the battery voltage. At maximum battery voltage the output will be approximately 2 Amps. 7. If NO or LOW output is found, test diode. Test Diode In the Diode Test position...

38 2 2 2. Insert BLACK test lead ( B ) into the COM receptacle in the meter. 3. Attach RED test lead clip to ( D ) of the WHITE wire ( C ). (It may be necessary to pierce wire with a pin as shown.) 4. Insert BLACK test lead ( B ) into harness connector. Figure 25 • If meter “Beeps” once, diode is OK...

39 2 2 1. Connect stator wire harness to regulator- rectifier. 2. Insert RED test lead into 10 Amp receptacle in meter. 3. Insert BLACK test lead into COM receptacle in meter. 4. Rotate selector to DC Amps position. 5. Attach RED test lead clip ( A , Figure 27) to RED DC output terminal on regulator...

40 2 2 NOTICE: Connect test leads BEFORE starting the engine. Be sure connections are secure. If a test lead vibrates loose while engine is running, the regulator-rectifier may be damaged. Use the DC Shunt #19468 ( D , Figure 29) to avoid blowing the fuse in the test meter when testing the DC output...

41 2 2 20 Amp DC Regulated Alternator The 20 Amp regulated alternator system provides AC current through two output leads to the regulator-rectifier. The regulator-rectifier converts the AC current to DC, and regulates current to the battery. The charging rate will vary with engine RPM and temperatu...

43 2 2 ELECTRIC STARTERS Before assuming an electric starter requires service, check the engine for freedom of rotation by removing the spark plug and turning the crankshaft over by hand. Any belt, clutch, or other parasitic load will affect the starter cranking performance, so ensure their effects ...

45 2 2 Test Interlock Switch Wiring 1. Disconnect interlock switch wires from spade terminals on switch and at starter motor connection. 2. Set meter to Ohms position. 3. Connect one meter test lead to the end of one wire connector and other test lead to the opposite connector in the same wire (Figu...

46 2 2 Figure 38 5. Activate starter motor and note readings of meter and tachometer.Take reading after meter stabilizes (approximately 2-3 seconds). 6. A starter motor in good condition will be between the following specs: • 6500 RPM (minimum) and 35 Amps (maximum) -OR- • 5000 RPM (minimum) and 20 ...

47 2 2 BATTERIES A 12 Volt, lead acid, wet cell battery is required to operate starter motors on Briggs & Stratton OHV single cylinder engines. This type is available as a wet charge or dry charge battery. The wet charged maintenance-free battery is filled with electrolyte and sealed at the time...

48 2 2 Figure 40 Testing Battery Set the digital multimeter to DC volts position. Test the battery while installed in the equipment. 1. Disconnect wire from spark plug and ground ignition using Ignition Tester #19368. 2. Attach RED meter test clip to positive ( + ) battery terminal. Attach BLACK met...

49 2 2 EQUIPMENT AFFECTING ENGINE OPERATION Frequently, what appears to be a problem with engine operation, such as hard starting or vibration, may be the fault of the equipment rather than the engine itself. Below are some common symptoms and potential equipment-related sources. Hard Starting or Wi...

50 2 2 On/Off Switch Light Does Not Flash 1. Check engine oil level. If low, add oil to bring to FULL mark on dipstick. 2. Try to start engine while shading ON/OFF switch light from bright light such as sunlight. If light does not flash, replace switch. If new switch still does not flash, go to next...

51 3 3 SECTION 3 - EXHAUST SYSTEMS SPARK ARRESTORS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -52 MUFFLER SERVICE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -...

52 3 3 Some engines are equipped with exhaust systems (mufflers, brackets, and hardware) supplied by the OEM. Contact the OEM for muffler service information.Exhaust systems covered in this section are those supplied by Briggs & Stratton. Spark Arresters Remove spark arrester ( A , Figure 1) for...

53 3 3 Figure 3 3. Remove screws ( A , Figure 4) holding upper muffler bracket to lower muffler bracket. Figure 4 4. Unscrew muffler from exhaust elbow and pipe assembly. 5. Remove and disassemble elbow and pipe assembly, if required. Inspect Exhaust System All exhaust system components must be insp...

58 3 3 7. Install blower housing and rewind starter. 8. Install oil fill tube and dipstick. 9. Lightly coat muffler guard mounting screws with Valve Guide Lubricant #93963. 10. Place muffler guard over muffler and start screws ( A , B , C , Figure 22). Torque to values listed in Section 12 - Engine ...

59 3 3 Install Muffler 1. Lightly coat muffler adapter screws with Valve Guide Lubricant #93963. 2. Install new gasket and adapter. Install screws ( A , Figure 25) and torque to values listed in Section 12 - Engine Specifications. Figure 25 3. Install muffler supports and start but do not tighten sc...

61 4 4 SECTION 4 - FUEL SYSTEMS AND CARBURETION FUEL SYSTEMS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -62 FUEL PUMP - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -...

62 4 4 FUEL SYSTEMS NOTE: Replace air cleaner gaskets and mounting gaskets whenever carburetor is removed for service. NOTE: Do not insert a screw in the end of the fuel hose to stop fuel flow. Screw threads will loosen rubber particles which will get into the carburetor. NOTE: Before servicing the ...

63 4 4 Fuel Pump The fuel pump, mounted near the blower housing and the air cleaner cover, allows remote fuel tank installations on some engines. The pump is operated by vacuum pulses from the engine. NOTE: The fuel pump itself is not serviceable. If the pump does not operate after inspection and pr...

64 4 4 Fuel Filter Some engines are equipped with a fuel filter (Figure 3) mounted in-line between the fuel tank and the carburetor. Replace the filter annually or whenever fuel system service is performed. Figure 3 1. Drain the fuel tank or close the fuel shut- off valve, if equipped. 2. Slide the ...

67 4 4 CARBURETION Carburetor Identification • Figure 6 - LMS, Models 97700, 99700, 110000, 120000, 150000 Vertical and Horizontal Shaft • Figure 7 - ReadyStart®, Models 110000, 120000 Vertical Shaft • Figure 8, Figure 9 - LMT, Models 200000, 210000, 280000, 310000, 330000 Vertical and Horizontal Sh...

68 4 4 Figure 11 NOTE: Consult the Illustrated Parts List to obtain the appropriate carburetor overhaul kit before reassembling the carburetor. NOTE: Many early carburetors had adjustable needle valves to compensate for high altitude conditions. Later carburetors use replaceable main jets to compens...

69 4 4 Figure 13 Figure 14 4. Remove two carburetor mounting screws. 5. Pull carburetor away from the control bracket assembly and rotate it to disengage the governor link from the grommet on top of the throttle shaft lever. NOTE: On early production models, the mounting screws also retained the con...

71 4 4 Figure 20 6. Install new inlet needle ( E , Figure 21) on float ( D ), then position float in carburetor body. Secure with new hinge pin ( C ) and center the pin between the float bosses. NOTE: On Model 97700, install the flat disc ( B ) and main jet ( A ). Figure 21 7. Place new bowl gasket ...

72 4 4 Figure 24 6. Connect fuel hose to carburetor and secure with clamp. 7. Using new gasket, install air cleaner assembly to carburetor per Section 1. Ensure breather hose is properly installed on the breather tube. 8. Adjust carburetor, if applicable, per Section 1. LMS Carburetor Horizontal Mod...

75 4 4 7. Place new bowl gasket on carburetor body and install fuel bowl. Place new fiber washer on fixed main jet (bowl nut) and install. Torque to values listed in Section 12 - Engine Specifications. Install Carburetor NOTE: Always replace air cleaner gaskets and carburetor mounting gaskets any ti...

77 4 4 3. Place new gasket ( A , Figure 39), spacer, and new o-ring between control bracket ( B ) and carburetor ( C ). 4. Position carburetor on control bracket and install screws. Torque to value listed in Section 12 - Engine Specifications. NOTE: Use new screws or apply Loctite® to original screw...

82 4 4 Nikki Carburetor Vertical Models 280000, 310000, 330000 Remove Carburetor 1. Disconnect the wire from the carburetor solenoid ( E , Figure 55). 2. Remove air cleaner assembly per Section 1. Discard gasket. 3. Move clamp and disconnect fuel hose from carburetor. 4. Remove two carburetor screws...

83 4 4 Figure 58 6. If equipped, remove the idle mixture screw with spring ( A , Figure 59) and the idle speed screw with spring ( B ). Figure 59 7. Rotate the throttle shaft to the closed position (Figure 60). Remove two screws ( A ) and the throttle plate. Figure 60 8. Pull the throttle shaft from...

84 4 4 • Choke shaft and choke valve • Throttle shaft and throttle valve • All passages, openings, and the inside and outside of the carburetor body NOTE: Do not soak non-metallic components, such as floats, o-rings, seals, or diaphragms, in carb/choke cleaner or they will be damaged. 4. If any pass...

87 5 5 SECTION 5 - GOVERNOR SYSTEMS LINKAGE AND SPRING ORIENTATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -88 GOVERNED RPM LIMITS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -89 GOVERNOR ...

88 5 5 GOVERNOR SYSTEMS Linkage and Spring Orientation NOTE: Be sure to note hole position of linkage before removing. • Figure 1 - Horizontal Shaft Models 110000, 120000, 150000, 200000, 210000. • Figure 2 - Vertical Shaft Model 97700 • Figure 3 - Vertical Shaft Model 99700 • Figure 4 - Vertical Sh...

89 5 5 Figure 6 Figure 7 Figure 8 Governed RPM Limits To comply with specified top governed speed limits, Briggs & Stratton supplies engines with an adjustable top speed limit, which the equipment manufacturers set to their own specifications. Top governed speed should be checked with a tachomet...

93 6 6 SECTION 6 - CYLINDER HEAD AND VALVES SERVICE CYLINDER HEAD - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -94 HORIZONTAL AND VERTICAL MODELS 97700, 99700, 110000, 120000, 150000 - - - - - - - - - - - - - - - - - - - - - - 94 SERVICE C...

94 6 6 CYLINDER HEADS AND VALVES Before the cylinder head can be removed, other external parts must be removed, such as the air cleaner, fuel tank, oil fill tube, blower housing, muffler, carburetor, control bracket assembly, and intake manifold. Remove Cylinder Head Horizontal and Vertical Models 9...

95 6 6 Figure 6 3. Remove push rods one at a time, marking the location and orientation of each for proper installation later. 4. Using a plastic scraping tool, carefully clean all traces of head gasket from the head and cylinder mating surfaces. Disassemble Cylinder Head 1. Loosen rocker arm screws...

96 6 6 2. If head passes visual inspection, use Plug Gauge #19122 to check valve guides for wear. If gauge enters the guide 1/4” (6.4 mm) or more, replace the guide (models 97700, 99700) or replace the entire head (models 110000, 120000, 150000). If plug gauge is not available, see Section 12 - Engi...

97 6 6 Figure 13 4. Support valve side of cylinder head on clean shop rags. Place valve springs and valve spring retainers over valve stems. Using thumbs, press against each retainer until it securely locks into groove in valve stem (Figure 14). Figure 14 Install Cylinder Head 1. Coat threads of all...

104 7 7 REWIND STARTERS On some engines, the rewind starters are attached to the blower housing with screws and can be quickly removed. Other starters are riveted or spot welded to the blower housing and must be drilled to remove, following the procedures below. For installation, screws and nuts are...

106 7 7 Figure 8 6. Carefully drill through all rivet heads and remove rewind starter. Do not allow drill bit to cut into the holes in the starter housing. NOTE: Do not attempt to drill out the rivets while the blower is still on the engine. The rivets are made of steel and the shavings will collect...

109 7 7 5. Fill fuel tank or open fuel shut-off valve. Connect fuel hose to carburetor and connect spark plug wire. Figure 16 Vertical Model 280000 1. For installation, screws and nuts are available separately from the Illustrated Parts List and are included with complete replacement starters. 2. At...

110 7 7 2. Wipe off any excess oil from the top of the ratchet, then place the ratchet on the housing. 3. Install the retainer cover and seal over the ratchet and press into housing until fully closed. Install retaining screws (if used). 4. Place one drop of clean engine oil on top of crankshaft pil...

111 7 7 Remove Starter Drive and Clutch 1. Remove E-ring ( A , Figure 20). 2. Remove three screws ( B ) holding gear cover. 3. Lift clutch assembly and gears from shaft. Figure 21 Install Starter Drive and Clutch 1. Slip pinion ( A , Figure 21) on motor shaft. 2. Add approximately 3/4 ounce of Brigg...

113 7 7 Figure 28 4. Place new C-ring over chamfered end of shaft. 5. Align one of the slots ( G , Figure 28) of C- Ring Installer #19435 with open end of C-ring ( H ). 6. Press on tool until C-ring snaps into groove in shaft. 7. Manually actuate pinion gear on helix to ensure proper movement. Figur...

114 7 7 Assemble Starter Drive - Roll Pin Retainer 1. Place clutch ( E , Figure 31) on starter shaft and rotate clutch until it drops into place. Figure 32 2. Install pinion gear ( D ) with beveled edge of teeth up. 3. Place washer ( C ) and retainer ( B ) on starter shaft. 4. Press new roll pin ( A...

115 8 8 SECTION 8 - LUBRICATION SYSTEMS EXTENDED OIL FILL AND DIPSTICK - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 116 BREATHERS- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ...

116 8 8 EXTENDED OIL FILL AND DIPSTICK Horizontal Models 110000, 120000, 150000, 200000, 210000 These models use a plastic extended oil fill tube and a quarter-turn dipstick. The oil fill tube screws into the crankcase cover. Vertical Models 90000, 110000, 120000, 210000, 280000, 310000, 330000 Thes...

117 8 8 Figure 2 Check Breather 1. Check for movement of the disc valve in the breather assembly. If disc is stuck or binding, replace the breather assembly. 2. Visually inspect the assembly for warping, wear, or damage. If these conditions are found, replace the breather assembly. 3. Inspect oil dr...

119 8 8 Install Breather 1. Install reed with the metal tab facing outside of the engine, as shown in Figure 8. Torque screw to values listed in Section 12 - Engine Specifications. 2. Place new gasket or sealant on cylinder. Install breather cover and torque screws to values listed in Section 12 - E...

120 8 8 Oil Slinger with Pressure Filtration Vertical Models 120000, 210000, 280000, 310000, 330000 Some of these models are equipped with a gerotor pump that draws oil from the sump, pumps it through the oil filter, and back to the sump (Figure 11). The gerotor pump is driven by the cam gear. The s...

121 8 8 Figure 15 2. Carefully remove inner ( C ) and outer rotors ( D ). NOTICE: Depending on Model Series, inner rotor may include the drive shaft or the drive shaft may be a separate part. Remove shaft, when it is a separate part. Remove Pump Screen Three types of oil pump screens have been used ...

123 8 8 Figure 24 Inspect 1. Check adapter for cracks or damage to the sump and filter mounting surfaces. Replace adapter if necessary. 2. Clean all oil passages in adapter and in sump. Install 1. Using new gasket, place adapter on sump and install screws. Torque screws to values listed in Section 1...

126 9 9 CYLINDER Inspect Cylinder 1. Visually check cylinder for cracks, stripped threads, and bore damage. • If cracks are found, replace the cylinder. • Stripped threads can sometimes be repaired using a helicoil, but if multiple holes have thread damage, replace the cylinder. • Bore damage, if no...

127 9 9 Cleaning Cylinder 1. Wash the cylinder thoroughly in a solvent such as kerosene or other commercial solvent. 2. Wash cylinder again using a stiff brush with soap and hot water. 3. Rinse cylinder thoroughly with hot running water. 4. Repeat washing and rinsing until all traces of honing grit ...

128 9 9 replace the affected cylinder, crankcase cover, or sump (Figure 6). NOTE: Standard and reject sizes for the main bearings are shown in Section 12 - Engine Specifications. Figure 6 Replace Bearings Replace DU ™ Bearings 1. Select tools needed from Figure 7 and Figure 8. Figure 7 Figure 8 2. R...

129 9 9 Figure 10 5. Place cylinder or cover/sump on cylinder support ( B , Figure 11) with large opening facing bearing. 6. Align oil holes in bearing with oil holes in cylinder or cover/sump, then press in new bearing to correct depth with bushing driver ( A ). Figure 11 7. Stake bearing into notc...

132 9 9 Figure 19 NOTE: Always install new oil seals when engine is reassembled or when replacing bearings. Always use the correct seal protector to prevent damaging the oil seal during installation. COVERS AND SUMPS Installation 1. Select correct seal protector for Kit #19356, to protect oil seal w...

135 10 10 SECTION 10 - CRANKSHAFTS, CAMSHAFTS, BALANCING SYSTEMS, AND GEAR REDUCTIONS CRANKSHAFTS AND CAMSHAFTS- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 136 REMOVE CRANKSHAFT AND CAMSHAFT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ...

136 10 10 CRANKSHAFTS AND CAMSHAFTS Remove Crankshaft and Camshaft 1. Drain oil from engine and all fuel from fuel tank. Drain oil from gear reduction unit (if equipped) and remove from engine ( A , Figure 1). 2. Remove blower housing/rewind assembly and flywheel/fan assembly. 3. Remove burrs and cl...

137 10 10 Figure 4 Figure 5 2. Using a dial caliper, measure the journal diameters and cam lobes. Compare results to values listed in Section 12 - Engine Specifications. If wear exceeds the reject dimensions, replace the camshaft. Install Crankshaft and Camshaft 1. Lubricate the cylinder bearing/oil...

138 10 10 Install Crankcase Cover or Sump 1. Using a new gasket install crankcase cover or sump using seal protectors. Do not force cover or sump on cylinder. NOTE: It may be necessary to rotate crankshaft to get oil pump (if equipped) to engage drive slot in camshaft. For horizontal crankshafts, it...

140 10 10 GEAR REDUCTION Disassemble Gear Reduction 1. Note orientation of gear reduction assembly on engine. Place an oil collection pan beneath the assembly. 2. Remove oil vent plug ( C , Figure 17) and set aside. 3. Loosen four cap screws ( D ) that secure the gear case cover assembly. Pull cover...

141 10 10 Figure 20 7. Install pinion gear on crankshaft. 8. Slide drive shaft assembly into gear case bearing and rotate to engage crankshaft pinion gear. 9. Place new gasket on gear case assembly. 10. Slide cover over drive shaft until seated on new gasket. NOTE: Vent plug hole must be positioned ...

142 10 10 AUXILIARY PTO Some models of the vertical shaft 110000 and 120000 engines were equipped with an auxiliary PTO shaft. The auxiliary PTO shaft ( E , Figure 23) extends through the side of the sump, perpendicular to the crankshaft. Rotation can be either clockwise or counterclockwise, as view...

143 10 10 COUNTERBALANCE SYSTEMS Two styles of counterbalance systems are used on Vertical crankshaft engines.Models 280000 and 310000 (built before July 2001) have the Synchro-Balance® system. Models 280000 and 310000 built July 2001 and later, and all models 210000 and 330000 have the AVS® system....

145 10 10 AVS® Balance System Remove 1. Remove blower housing, flywheel, cylinder head, and sump. Discard gaskets. 2. Remove connecting rod and piston assembly. 3. Remove crankshaft and counterweight assembly. Disassemble 1. Remove the crankshaft gear ( F , Figure 30) from the crankshaft ( A ). If t...

147 9 11 SECTION 11 - PISTONS, RINGS AND CONNECTING RODS REMOVE PISTON AND CONNECTING ROD- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 148 DISASSEMBLE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -...

148 9 11 PISTONS, RINGS, & CONNECTING RODS Remove Piston and Connecting Rod 1. Carefully remove any carbon or ridge at top of cylinder bore to prevent ring breakage. 2. Remove rod bolts and connecting rod cap ( A , Figure 1). 3. Push piston and rod assembly out through top of cylinder bore. Figu...

149 9 11 Engine Specifications. If clearance is greater than shown the piston must be replaced. Figure 4 Check Ring End Gap It is recommended that the entire ring set be replaced when servicing the piston and/or cylinder bore. However, the original rings can be re-used if they are not damaged and ar...

150 9 11 NOTE: For Vertical Model 120000 ONLY, install piston with notch or arrow ( A , Figure 8) facing away from “MAG” on the rod. When installed in engine, the notch will face the PTO. Figure 8 3. Install a pin retainer into groove on open side of piston pin bore. Ensure retainers are firmly seat...

151 12 SECTION 12 - ENGINE SPECIFICATIONS MODEL 110000 HORIZONTAL SERIES- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 152 MODEL 120000 HORIZONTAL SERIES- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 154 MODEL 1500...