Briggs & Stratton L-Head Series 250000 Engines Service & Repair Manual

GENERAL INFORMATION Section 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IGNITION Section 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CARBURETION Section 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GOVERNOR CONTROLS, CARBURETOR LINKAGE & FLYWHEEL BRAKES Section 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GOVERNORS Section 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . COMPRESSION Section 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . STARTERS & CHARGING SYSTEMS Section 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . LUBRICATION Section 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PISTONS, RINGS, RODS Section 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CRANKSHAFTS, CAM GEARS, GEAR REDUCTIONS & AUXILIARY DRIVES Section 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CYLINDERS & BEARINGS Section 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SYNCHRO-BALANCE & OSCILLATING COUNTER BALANCE Section 12 . . . TABLE OF CONTENTS I

II CHECK COMMON SPECIFICATIONS FOR TORQUE SPECIFICATIONS VALVE CLEARANCE BASIC OIL CAPACITY ARMATURE TORQUE SPECIFICATIONS VALVE CLEARANCE BASIC MODEL SERIES OIL CAPACITY Fl. Ozs.J ARMATURE AIR GAP INCHES FLYWHEEL NUT FT. LBS. CYLINDER HEAD IN. LBS. CONN. ROD IN. LBS. CRANKCASE COVER OR SUMP IN. LBS. INTAKE INCHES EXHAUST INCHES 60000 H 21 .006 .010 55 140 100 85 .005 .007 .007 .009 80000 H 21 .006 .010 55 140 100 85 .005 .007 .007 .009 90000 H 21 V 18 .006 .010 55 140 100 85 .005 .007 .007 .009 10A900, 10B900, 10C900 V 18 .006 .010 55 140 100 85 .005 .007 .007 .009 100200, 100900 H 21 V 28 .006 .010 60 140 100 120 .005 .007 .007 .009 100700 V 18 .006 .010 55 140 100 85 .005 .007 .007 .009 A L 110000 H 21 V 18B .006 .010 55 140 100 85 .005 .007 .007 .009 L U M I 120000 V 28 .006 .010 55 140 100 85 .005 .007 .007 .009 I N U 130000 H 21 V 28 .010 .014 60 140 100 120 .005 .007 .009 .011 U M 170000 H 44 V 36 .010 .014 65 165 165 140 .005 .007 .009 .011 190000 H 48 V 48 .010 .014 65 165 185 140 .005 .007 .009 .011 220000 H 48 V 48 .010 .014 65 165 185 140 .005 .007 .009 .011 250000 H 48 V 48 .010 .014 65 165 185 140 .005 .007 .009 .011 280000 except 286700 V 48 .010 .014 100 165 See Section 9, Page 8, Table No. 4 140Y 200Y .005 .007 .009 .011 286700 V 48 .010 .014 100 165 See Section 9, Page 8, Table No. 4 140Y 200Y .004 .006 .009 .011 C A 230000 H 64 .010 .014 145 190 190 90 mag. 190 PTO .007 .009 .017 .019 A S T 240000 H 64 .010 .014 145 190 190 90 mag. 190 PTO .007 .009 .017 .019 I R 300000 H 64 .010 .014 145 190 190 90 mag. 190 PTO .007 .009 .017 .019 R O N 320000 H 64 .010 .014 145 190 190 90 mag. 190 PTO .007 .009 .017 .019 J H for Horizontal Crankshaft & V for Vertical Crankshaft, z Governed Idle, See Section 5 for adjustment procedures, B Right Angle Drive 21 Fl. Ozs., Y See Section 11, page 11, TABLE NO. 5.

III CHART ALL SINGLE CYLINDER “L” HEAD ENGINE MODELS CRANKSHAFT STANDARD STROKE STANDARD CRANKPIN JOURNAL REJECT SIZES INCHES END PLAY STANDARD CYLINDER BORE INCHES STROKE INCHES CRANKPIN JOURNAL INCHES MAGNETO CRANKPIN PTO HORIZONTAL INCHES VERTICAL INCHES 2.3740 2.3750 1.500 Not Required .873 .870 .873 .002 .008 – 2.3740 2.3750 1.750 .9983 .9988 .873 .996 .873 .002 .008 – 2.5615 2.5625 1.750 .9983 .9988 .873 .996 .873 .002 .010 .002 .030 2.5615 2.5625 1.876 .8731 .8739 .873 .872 .873 .002 .030 .002 .030 2.4990 2.5000 2.125 .9983 .9988 .873 .996 .998 .002 .008 .002 .008 2.5615 2.5625 1.940 .9983 .9988 .873 .996 1.060 .002 .030 .002 .030 2.7802 2.7812 1.940 .9983 .9988 .873 .996 .873 .002 .008 .002 .008 2.6875 2.6885 2.020 ".9983/.9988 A1.0983/1.0991 .873 .996 1.060 .002 .030 .002 .030 2.5615 2.5625 2.438 .9983 .9988 .873 .996 .998 .002 .008 .002 .008 2.9990 3.0000 2.375 1.0920 1.0924 .997 1.179 D 1.090 1.179 .002 .008 .002 .008 2.9990 3.0000 2.750 1.1239 1.1243 .997 1.179 D 1.122 1.179 .002 .030 .002 .030 3.4365 3.4375 2.375 1.2489 1.2493 1.376 1.247 1.376 .002 .030 .002 .030 3.4365 3.4375 2.625 1.2489 1.2493 1.376 1.247 1.376 .002 .030 .002 .030 3.4365 3.4375 3.062 1.2489 1.2493 1.376 1.247 1.376 .002 .023 .002 .023 3.4365 3.4375 3.062 1.2489 1.2493 1.376 1.247 1.376 .002 .023 .002 .023 2.9990 3.0000 3.250 1.1840 1.1868 1.3769 1.1844 1.3769 .002 .008 .002 .008 3.0615 3.0625 3.250 1.3114 1.3118 Ball 1.3094 Ball .002 .008 .002 .008 3.4365 3.4375 3.250 1.3114 1.3118 Ball 1.3094 Ball .002 .008 .002 .008 3.5615 3.5625 3.250 1.3114 1.3118 Ball 1.3094 Ball .002 .008 .002 .008 D Synchro-Balance, A after Date Code 97011200, " before Date Code 97011300

IV English to Metric Conversion Table Fraction Decimal mm Fraction Decimal mm 1/64 0.0156 0.3969 33/64 0.5156 13.0969 1/32 0.0312 0.7938 17/32 0.5312 13.4938 3/64 0.0469 1.1906 35/64 05469 13.8906 1/16 0.0625 1.5875 9/16 0.5625 14.2875 5/64 0.0781 1.9844 37/64 0.5781 14.6844 3/32 0.0938 2.3812 19/32 0.5938 15.0812 7/64 0.1094 2.7781 39/64 0.6094 15.4781 1/8 0.1250 3.1750 5/8 0.6250 15.8750 9/64 0.1406 3.5719 41/64 0.6406 16.2719 5/32 0.1562 3.9688 21/32 0.6562 16.6688 11/64 0.1719 4.3656 43/64 0.6719 17.0656 3/16 0.1875 4.7625 11/16 0.6875 17.4625 13/64 0.2031 5.1594 45/64 0.7031 17.8594 7/32 0.2188 5.5562 23/32 0.7188 18.2562 15/64 0.2344 5.9531 47/64 0.7344 18.6531 1/4 0.2500 6.3500 3/4 0.7500 19.0500 17/64 0.2656 6.7469 49/64 0.7656 19.4469 9/32 0.2812 7.1438 25/32 0.7812 19.8438 19/64 0.2969 7.5406 51/64 0.7969 20.2406 5/16 0.3125 7.9375 13/16 0.8125 20.6375 21/64 0.3281 8.3344 53/64 0.8281 21.0344 11/32 0.3438 8.7312 27/32 0.8438 21.4312 23/64 0.3594 9.1281 55/64 0.8594 21.8281 3/8 0.3750 9.5250 7/8 0.8750 22.2250 25/64 0.3906 9.9219 57/64 0.8906 22.6219 13/32 0.4062 10.3188 29/32 0.9062 23.0188 27/64 0.4219 10.7156 59/64 0.9219 23.4156 7/16 0.4375 11.1125 15/16 0.9375 23.8125 29/64 0.4531 11.5094 61/64 0.9531 24.2094 15/32 0.4688 11.9062 31/32 0.9688 24.6062 31/64 0.4844 12.3031 63/64 0.9844 25.0031 1/2 0.5000 12.7000 1 1.0000 25.4000

V Drill Size – Decimal Equivalent In Inches 60 .040 59 .041 58 .042 57 .043 56 .0465 55 .052 54 .055 53 .0595 1/16 .0625 52 .0635 51 .067 50 .070 49 .073 48 .076 5/64 .0781 47 .0785 46 .081 45 .082 44 .086 43 .089 42 .0935 3/32 .0938 41 .096 40 .098 39 .0995 38 .1015 37 .104 36 .1065 7/64 .1094 35 .110 34 .111 33 .113 32 .116 31 .120 1/8 .125 30 .1285 29 .136 28 .1405 9/64 .1406 27 .144 26 .147 25 .1495 24 .152 23 .154 5/32 .1562 22 .157 21 .159 20 .161 19 .166 18 .1695 11/64 .1719 17 .173 16 .177 15 .180 14 .182 13 .185 3/16 .1875 12 .189 11 .191 10 .1935 9 .196 8 .199 7 .201 13/64 .2031 6 .204 5 .2055 4 .209 3 .213 7/32 .2188 2 .221 1 .228 A .234 15/64 .2344 B .238 C .242 D .246 E, 1/4 .250 F .257 G .261 17/64 .2656 H .266 I .272 J .277 K .281 9/32 .2812 L .290 M .295 19/64 .2969 N .302 5/16 .3125 O .316 P .323 21/64 .3281 Q .332 R .339 11/32 .3438 S .348 T .358 23/64 .3594 U .368 3/8 .375 V .377 W .386 25/64 .3906 X .397 Y .404 13/32 .4062 Z .413 27/64 .4219 7/16 .4375 29/64 .4531 15/32 .4688 31/64 .4844 1/2 .500

1 1 SECTION 1 General Information Section Contents Page SAFETY 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AIR CLEANER IDENTIFICATION 8-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cartridge Type 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dual Element 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil-Foam  9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CHECK-UP 13-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Compression 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carburetion 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ignition 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ENGINE OPERATION Equipment Affecting 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hard Starting 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Kick-Back 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Noise 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Loss 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Will Not Start 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vibration 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FUEL RECOMMENDATIONS 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MAINTENANCE Air Cleaners Clean Cartridge Type 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dual Element See Cartridge and Oil-Foam  Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil-Foam  11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Remove and Install Cartridge Type 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dual Element 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil-Foam  11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil, Lubrication Change Oil 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil Capacities 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OIL RECOMMENDATIONS 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cooling System Clean 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ENGINE IDENTIFICATION 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TUNE-UP PROCEDURE 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 2 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 with the alert symbol to indicate the likelihood and the potential severity of injury. In addition, a hazard symbol may be used to represent the type of hazard. DANGER indicates a hazard which, if not avoided, will result in death or serious injury. WARNING indicates a hazard which, if not avoided, could result in death or serious injury. CAUTION indicates a hazard which, if not avoided, might result in minor or moderate injury. CAUTION, when used without the alert symbol, indicates a situation that could result in damage to the engine. HAZARD SYMBOLS AND MEANINGS Hot Liquid or Steam Toxic Fumes Shock Hot Surface Kickback Fire Moving Parts 4 Prior to work, read and understand the section(s) of this manual that pertain to the job. Follow all safety warnings. 4 WEAR suitable eye protection (safety glasses, goggles or face shield when performing repair procedures). 4 PREVENT ACCIDENTAL STARTING by removing spark plug wire from spark plug when servicing engine or equipment. Disconnect negative wire from battery terminal if equipped with electric starting system. 4 PERIODICALLY clean engine. Keep governor parts free of dirt, grass and other debris which can affect engine speed. 4 USE fresh gasoline. Stale fuel can gum carburetor and cause leakage. 4 CHECK fuel lines and fittings frequently for cracks or leaks. Replace if necessary. WARNING: The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

1 3 WARNING Gasoline and its vapors are extremely flammable and explosive. Fire or explosion can cause severe burns or death. WHEN ADDING FUEL • Turn engine OFF and let engine cool at least 2 minutes before removing gas cap. • Fill fuel tank outdoors or in well-ventilated area. • Do not overfill fuel tank. Fill tank to approximately 1-1/2 inches below top of neck to allow for fuel expansion. • Keep gasoline away from sparks, open flames, pilot lights, heat, and other ignition sources. • Check fuel lines, tank, cap, and fittings frequently for cracks or leaks. Replace if necessary. WHEN STARTING ENGINE • Make sure spark plug, muffler, fuel cap and air cleaner are in place. • Do not crank engine with spark plug removed. • If fuel spills, wait until it evaporates before starting engine. • If engine floods, set choke to OPEN/RUN position, place throttle in FAST and crank until engine starts. WHEN OPERATING EQUIPMENT • Do not tip engine or equipment at angle which causes gasoline to spill. • Do not choke carburetor to stop engine. WHEN TRANSPORTING EQUIPMENT • Transport with fuel tank EMPTY or with fuel shut-off valve OFF. WHEN STORING GASOLINE OR EQUIP- MENT WITH FUEL IN TANK • Store away from furnaces, stoves, water heaters or other appliances that have a pilot light or other ignition source because they can ignite gasoline vapors. WARNING Unintentional sparking can result in fire or electric shock. Unintentional start-up can result in entangle- ment, traumatic amputation, or laceration. BEFORE PERFORMING ADJUSTMENTS OR REPAIRS • Disconnect spark plug wire and keep it away from spark plug. • Disconnect battery at negative terminal (only engines with electric start). WHEN TESTING FOR SPARK • Use approved spark plug tester. • Do not check for spark with spark plug removed. WARNING Starting engine creates sparking. Sparking can ignite nearby flammable gases. Explosion and fire could result. • If there is natural or LP gas leakage in area, do not start engine. • Do not use pressurized starting fluids because vapors are flammable.

1 4 WARNING Engines give off carbon monoxide, an odor- less, colorless, poison gas. Breathing carbon monoxide can cause nau- sea, fainting or death. • Start and run engine outdoors. • Do not start or run engine in enclosed area, even if doors or windows are open. WARNING Running engines produce heat. Engine parts, especially muffler, become extremely hot. Severe thermal burns can occur on contact. Combustible debris, such as leaves, grass, brush, etc. can catch fire. • Allow muffler, engine cylinder, fins, and radiator to cool before touching. • Remove accumulated combustibles from muffler area and cylinder area. • Install and maintain in working order a spark arrester before using equipment on forest- covered, grass-covered, brush-covered unimproved land. The state of California requires this (Section 4442 of the California Public Resources Code). Other states may have similar laws. Federal laws apply on federal land. WARNING Rotating parts can contact or entangle hands, feet, hair, clothing, or accessories. Traumatic amputation or severe laceration can result. • Operate equipment with guards in place. • Keep hands and feet away from rotating parts. • Tie up long hair and remove jewelry. • Do not wear loose-fitting clothing, dangling drawstrings or items that could become caught. WARNING Broken bones, fractures, bruises or sprains could result. • Remove all external equipment/engine loads before starting engine. • Direct coupled equipment components such as, but not limited to, blades, impellors, pulleys, sprockets, etc., must be securely attached.

Briggs & Stratton L-Head Series 250000 Engines Service & Repair Manual

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