John Deere SST16 Spin-Steer Lawn Tractor Service Repair Manual Instant Download (tm1908)

JOHN DEERE WORLDWIDE COMMERCIAL & CONSUMER EQUIPMENT DIVISION Spin-Steer Lawn Tractor SST15, SST16 and SST18 TM1908 JULY 2004 TECHNICAL MANUAL North American Version Litho in U.S.A.

INTRODUCTION Manual Description Safety Specifications and Information Engine (Briggs & Stratton) Engine (Kohler) Electrical Power Train Steering NOTE: Depending on the particular section or system being covered, not all of the above groups may be used. Brakes Attachments Miscellaneous w w

SAFETY Be Prepared For Emergencies Recognize Safety Information Understand Signal Words Replace Safety Signs Use Care In Handling and Servicing Batteries Prevent Battery Explosions p p

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SAFETY Prevent Acid Burns Service Machines Safely Avoid acid burns by: If you spill acid on yourself: Avoid Injury From Rotating Blades, Augers and PTO Shafts If acid is swallowed: Wear Protective Clothing Use Proper Tools DO NOT Illuminate Work Area Safely

SAFETY Work In Clean Area Using High Pressure Washers Before starting a job: Work In Ventilated Area Park Machine Safely Before working on the machine: Warning: California Proposition 65 Warning Support Machine Properly and Use Proper Lifting Equipment Remove Paint Before Welding Or Heating Avoid Harmful Asbestos Dust

SAFETY Handle Chemical Products Safely Service Tires Safely Dispose Of Waste Properly Live With Safety

GENERAL VEHICLE SPECIFICATIONS TABLE OF CONTENTS Table of Contents Fastener Torques..............................................7 General Information..........................................9 Serial Number Locations ...............................12

GENERAL VEHICLE SPECIFICATIONS FASTENER TORQUES Fastener Torques Metric Fastener Torque Values 12.9 4.8 8.8 9.8 10.9 Property Class and Head Markings 12.9 10.9 8.8 9.8 4.8 8.8 9.8 12.9 4.8 10.9 12.9 Property Class and Nut Markings 12 10 10 5 10 10 12 5 5 10 10 12 o Lubricated means coated with a lubricant such as engine oil, or fasteners with phosphate and oil coatings. Dry means plain or zinc plated (yellow dichromate - Specification JDS117) without any lubrication

GENERAL VEHICLE SPECIFICATIONS FASTENER TORQUES Inch Fastener Torque Values 8 5 5.1 5.2 8.2 1 or 2b SAE Grade and Head Markings No Marks 5 2 SAE Grade and Nut Markings 8 No Marks o Lubricated means coated with a lubricant such as engine oil, or fasteners with phosphate and oil coatings. Dry means plain or zinc plated (yellow dichromate - Specification JDS117) without any lubrication Grade 2 applies for hex cap screws (Not Hex Bolts) up to 152 mm (6 in.) long. Grade 1 applies for hex cap screws over 152 mm (6 in.) long, and for all other types of bolts and screws of any length.

GENERAL VEHICLE SPECIFICATIONS GENERAL INFORMATION General Information Gasoline CAUTION: Avoid Injury! Gasoline is HIGHLY FLAMMABLE, handle it with care. DO NOT refuel machine while: Indoors, always fill gas tank outdoors; Machine is near an open flame or sparks; Engine is running, STOP engine; first; Engine is hot, allow it to cool sufficiently IMPORTANT: Avoid damage! California Proposition 65 Warning: Gasoline engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. smoking. Help prevent fires: Fill gas tank to bottom of filler neck only; Gasoline Storage Be sure fill cap is tight after fueling; Clean up any gas spills IMMEDIATELY; IMPORTANT: Avoid damage! Keep all dirt, scale, water or other foreign material out of gasoline. of excess grease, oil, debris, and faulty or damaged parts. Keep machine clean and in good repair - free John Deere Gasoline Conditioner and Stabilizer (TY15977) Any storage of machines with gas left in tank should be in an area that is well ventilated to prevent possible igniting of fumes by an open flame or spark, this includes any appliance with a pilot light. To prevent fire or explosion caused by STATIC ELECTRIC DISCHARGE during fueling: POLYETHYLENE PLASTIC fuel container and funnel WITHOUT any metal screen or filter. ONLY use a clean, approved To avoid engine damage: Engine Oil ONLY use clean, fresh unleaded gasoline with an octane rating (anti-knock index) of 87 or higher TURF - GARD - SAE 10W-30; PLUS - 4 - SAE 10W-30; also recommended TORQ - GARD SUPREME - SAE 5W-30 PLUS - 4 - SAE 10W-40

GENERAL VEHICLE SPECIFICATIONS GENERAL INFORMATION TORQ - GARD SUPREME - SAE 30. also recommended as a break-in engine oil TORQ - GARD SUPREME - SAE 5W-30. IMPORTANT: Avoid damage! After the break-in period, use the John Deere oil that is recommended for this engine. SAE 30 SAE 10W-40 SAE 10W-30 SAE 5W-30 BREAK-IN OIL SAE 5W-30 PREFERRED AIR TEMPERATURE Engine Break-In Oil IMPORTANT: Avoid damage! ONLY use a quality break-in oil in rebuilt or remanufactured engines for the first 5 hours (maximum) of operation. DO NOT use oils with heavier viscosity weights than SAE 5W- 30 or oils meeting specifications API SG or SH, these oils will not allow rebuilt or remanufactured engines to break-in properly. PREFERRED AIR TEMPERATURE John Deere Dealers: BREAK-IN ENGINE OIL

GENERAL VEHICLE SPECIFICATIONS GENERAL INFORMATION Chassis Grease Hydrostatic Transmission Oil IMPORTANT: Avoid damage! ONLY use HY-GARD J20D oil in this transmission. Mixing of two viscosity grade oils is NOT RECOMMENDED. DO NOT use type F automatic transmission fluid. IMPORTANT: Avoid damage! ONLY use a quality grease in this application. DO NOT mix any other greases in this application. DO NOT use any BIO- GREASE in this application. HY-GARD J20D OIL HIGH-TEMPERATURE EP GREASE - JDM J13E4, NLGI Grade 2. John Deere Dealers: GREASE-GARD - JDM J13E4, NLGI Grade 2. Synthetic Lubricants NLGI Grade 2 JDM J13E4 Alternative Lubricants AIR TEMPERATURE IMPORTANT: Avoid damage! Use of alternative lubricants could cause reduced life of the component. John Deere Dealers:

GENERAL VEHICLE SPECIFICATIONS SERIAL NUMBER LOCATIONS Lubricant Storage Engine Serial Number Mixing of Lubricants Picture Note: Briggs and Stratton Engines Serial Number Locations Machine Product Identification Number Picture Note: Kohler Engine Transaxle Serial Number

ENGINE - BRIGGS AND STRATTON TABLE OF CONTENTS Table of Contents Specifications .................................................15 Diagnostics .....................................................19 Tests and Adjustments..................................26 Repair...............................................................33

ENGINE - BRIGGS AND STRATTON SPECIFICATIONS Specifications Engine Specifications Engine Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SST16 and SST18 Make. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Briggs and Stratton Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vanguard V-Twin Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Gasoline Stroke/Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Engine Model Number: SST16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303777 SST18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350777 Horsepower: SST16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.9 kW (16 hp) SST18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.4 kW (18 hp) Displacement: SST16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 480 cm3 (29.3 cu in.) SST18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 570 cm3 (34.8 cu in.) Bore and Stroke: SST16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 mm (2.68 in.) SST18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 mm (2.84 in.) SST16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 mm (2.60 in.) SST18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 mm (2.76 in.) Cooling Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air Cooled Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pressurized Oil Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Full Flow Filter (w/o By-Pass Valve) Engine Oil: With Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 L (1.6 qt) Without Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4 L (1.5 qt) Air Cleaner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paper with outer foam element Muffler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Horizontal discharge below frame Fuel Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replaceable (In-Line Type) Aspiration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Normal Tests and Adjustments Specifications Spark Plug Gap. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.76 mm (0.030 in.) Slow Idle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1500 100 rpm Fast Idle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3350 50 rpm Crankcase Vacuum (minimum) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.2 cm H2O (4 in. H2O) Intake Vacuum (minimum). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 cm Hg (13 in. Hg) Valve Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.10 - 0.16 mm (0.004 - 0.006 in.) Valve Guide Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.7 mm (0.281 in.) Oil Pump Operating Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 - 517 kPa (10 - 75 psi)

ENGINE - BRIGGS AND STRATTON SPECIFICATIONS Repair Specifications Valves: Valve Guide: Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.01 - 6.02 mm (0.236 - 0.237 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.05 mm (0.238 in.) Valve Stem Standard Dimension: Intake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.94 - 5.96 mm (0.234 - 0.235 in.) Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.94 - 5.95 mm (0.234 - 0.235 in.) Valve Stem Wear Limit: Intake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.92 mm (0.233 in.) Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.91 mm (2.328 in.) Valve Seat Width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 - 1.6 mm (0.047 - 0.062 in.) Valve Margin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 mm ( 0.030 in.) Valve Face Angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 Valve Seat Narrowing Angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 Cylinder Bore, Pistons and Rings: SST16 Cylinder Bore: Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68.0 - 68.025 mm (2.677 - 2.678 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68.065 mm (2.6795 in.) SST18 Cylinder Bore: Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72.0 - 72.025 mm (2.835 - 2.836 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72.065 mm (2.837 in.) Piston Pin: Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.07 - 17.08 mm (0.672 - 0.673 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.06 mm (0.672 in.) Piston Pin Bore: Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.09 - 17.10 mm (0.673 - 0.674 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.12 mm (0.674 in.) Ring End Gap: Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.20 - 0.40 mm (0.008 - 0.016 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.76 mm (0.030 in.) Compression Ring Groove Wear Limit (New Ring Installed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.10 mm (0.004 in.) Oil Ring Groove Clearance Wear Limit (New Ring Installed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.20 mm (0.008 in.) Connecting Rod and Crankshaft: Connecting Rod Crankpin: Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.06 - 37.08 mm (1.459 - 1.460 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.11 mm (1.461 in.)

ENGINE - BRIGGS AND STRATTON SPECIFICATIONS Connecting Rod Piston Pin Bearing: Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.07 - 17.09 mm (0.672 - 0.673 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.13 mm (0.6745 in.) Crankshaft PTO Journal: Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.96 - 34.97 mm (1.376 - 1.377 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.92 mm (1.375 in.) Crankshaft Magneto Journal: Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.99 - 35.01 mm (1.3776 - 1.378 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.95 mm (1.376 in.) Magneto Bearing: Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.03 - 30.06 mm (1.1825 - 1.1835 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.08 mm (1.184 in.) PTO Bearing: Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.04 - 35.05 mm (1.379 - 1.380 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.07 mm (1.381 in.) Crankshaft Crankpin Journal: Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.0 - 37.02 mm (1.456 - 1.457 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36.95 mm (1.455 in.) Crankshaft End Play. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.08 - 0.40 mm (0.003 - 0.015 in.) Cam Gear PTO Journal: Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.94 - 19.96 mm (0.785 - 0.786 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.92 mm (0.784 in.) Cam Gear Magneto Journal: Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.95 - 15.97 mm (0.628 - 0.629 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.93 mm (0.627 in.) Cam Lobe: Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.33 - 30.53 mm (1.194 - 1.202 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.25 mm (1.191 in.) Cam Bearing (Magneto Side): Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.0 - 16.025 mm (0.630 - 0.631 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.08 mm (0.633 in.) Cam Bearing (PTO Side): Standard Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.0 - 20.02 mm (0.787 - 0.788 in.) Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.04 mm (0.789 in.)

ENGINE - BRIGGS AND STRATTON SPECIFICATIONS Torque Specifications Alternator to Cylinder Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 Nm (20 lb in.) Air Cleaner Base to Carburetor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 N m (65 lb-in.) Clutch to Crankshaft Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 N m (50 lb-ft) Connecting Rod Cap Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 N m (115 lb-in.) Clutch Mounting Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 N m (55 lb-ft) Crankcase Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 N m (150 lb-in.) Cylinder Head Cap Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 N m (165 lb-in.) Cylinder Shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 N m (65 lb-in.) Engine Mounting Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 N m (24 lb-ft) Exhaust Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 N m (150 lb-in.) Flywheel Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 N m (129 lb-ft) Fuel Shutoff Solenoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 N m (45 lb-in.) Oil Breather Mounting Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 N m (30 lb-in.) Oil Filter Adaptor Mounting Bolts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 N m (62 lb-in.) Oil Pump Mounting Screws. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 N m (62 lb-in.) Rocker Arm Adjustment Lock Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 N m (62 lb-in.) Rocker Mounting Studs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 N m (140 lb-in.) Spark Plug. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 N m (180 lb-in.) Starting Motor Mounting Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 N m (140 lb-in.) Valve Cover Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 N m (30 lb-in.)

ENGINE - BRIGGS AND STRATTON DIAGNOSTICS Engine Cranks But Does Not Start Diagnostics Symptom: Engine Cranks But Does Not Start Engine Diagnostics (1) Are battery cables loose or dirty? Yes - CAUTION: Avoid Injury! The engine may start to rotate at any time. Keep hands away from moving parts when testing. No - (2) Is battery fully charged? No - Test Conditions: Yes - (3) Have the operating conditions for the cranking and ignition systems been met? See Cranking Circuit Operation on page 138 and See Ignition Circuit Operation on page 142 in the Electrical section. Yes - No - (4) Is air cleaner dirty? Engine Doesn t Crank Yes - Symptom: Engine Doesn t Crank (1) Are battery cables loose or dirty? No - Yes - (5) Are spark plugs loose/dirty? No - Yes - (2) Is battery fully charged? See Battery Voltage & Specific Gravity Tests on page 178 in the Electrical section. No - (6) Is fuel old or contaminated? No - Yes - No - Yes - (7) Are fuel filter/lines clogged? (3) Is key switch working correctly? Yes - Yes - No - No - (8) Is fuel shutoff solenoid defective? See Fuel Shutoff Solenoid Test on page 29. Yes - (4) Has engine seized? No - Yes - (9) Is fuel pump defective? No - Yes - (5) Is starting motor or solenoid defective? No - Yes - (10) Is ignition coil air gap adjusted properly? See Ignition Armature Air Gap Adjustment on page 32. No -

ENGINE - BRIGGS AND STRATTON DIAGNOSTICS Engine Starts Hard Symptom: Engine Cranks But Does Not Start Yes - CAUTION: Avoid Injury! Do not rotate engine with starting motor if the spark plugs are removed. Gasoline spray from the open cylinders may be ignited by ignition spark and cause an explosion or fire. (11) Is carburetor adjusted properly, clean? See Carburetor Adjustment on page 28. No - Yes - IMPORTANT: Avoid damage! Perform a visual inspection first to determine if battery cables are tight and not corroded and if the battery is of sufficient size to turn the engine over at minimum cranking speed of 350 rpm. (12) Is magneto kill circuit grounded - shorted? See Ignition Circuit Operation on page 142 In the Electrical section. Yes - No - Symptom: Engine Starts Hard (13) Does engine lack compression? See Compression Test on page 30. (1) Are battery cables loose or dirty? Yes - Yes - No - No - (2) Is battery fully charged? See Battery Voltage & Specific Gravity Tests on page 178 in the Electrical section. (14) Do valve tappets need adjustment? See Valve Inspection and Repair on page 47. Yes - No - No - Yes - (15) Are valves and/or valve seats burned or are valve seats loose? See Valve Inspection and Repair on page 47. (3) Is air cleaner dirty? Yes - Yes - No - No - (16) Has engine seized? (4) Is fuel pump defective? Yes - Yes - No - No - (5) Is ignition coil air gap adjusted properly? See Ignition Armature Air Gap Adjustment on page 32. (17) Is camshaft worn? Yes - No - Yes - (6) Is carburetor adjusted properly, clean? See Carburetor Adjustment on page 28. No - Yes - (7) Are spark plugs loose/dirty? Yes - No -

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ENGINE - BRIGGS AND STRATTON DIAGNOSTICS Engine won t shut off Symptom: Engine Starts Hard Symptom: Engine won t shut off (8) Is fuel old or contaminated? (1) Is magneto kill circuit grounded - shorted? See Ignition Circuit Operation on page 142 in the Electrical section. Yes - No - (9) Does engine lack compression? See Compression Test on page 30. Yes - No - Yes - (2) Is carburetor adjusted properly, clean? See Carburetor Adjustment on page 28. No - (10) Do valve tappets need adjustment? See Valve Inspection and Repair on page 47. No - Yes - Yes - (3) Is fuel shutoff solenoid defective? See Fuel Shutoff Solenoid Test on page 29. No - (11) Are valves and/or valve seats burned or are valve seats loose? See Valve Inspection and Repair on page 47. Yes - Loss of power Yes - Symptom: Loss of power (1) Is air cleaner dirty? No - Yes - (12) Is cylinder head warped? See Cylinder Head Inspection and Repair on page 46. No - Yes - (2) Are fuel filter/lines clogged? Yes - No - No - (13) Is exhaust system restricted? (3) Is fuel pump defective? Yes - Yes - No - No - (14) Is camshaft worn? (4) Is ignition coil air gap adjusted properly? See Ignition Armature Air Gap Adjustment on page 32. Yes - No - No - (15) Is connecting rod broken? See Connecting Rod Inspection on page 50. Yes - Yes - (5) Are spark plugs loose/dirty? Yes - No - No - (16) Are cylinder bore or rings worn? See Piston, Rings & Rod Removal and Installation on page 48 and See Cylinder Bore Inspection on page 52. (6) Is fuel old or contaminated? Yes - Yes - No - (7) Is fuel shutoff solenoid defective? See Fuel Shutoff Solenoid Test on page 29.

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