RESIDENTIAL PRODUCTS SINGLE STAGE SNOW ENGINE SERVICE MANUAL LC168F / LC168FD (163cc)
About this Manual This service manual was written expressly for Toro service technicians. The Toro Company has made every effort to make the information in this manual complete and correct. Basic shop safety knowledge and mechanical/electrical skills are assumed. The Table of Contents lists the systems and the related topics covered in this manual. An electronic version of this service manual is available on the Toro Dealer Portal.
Chapter 1 – General Service Information 1 Chapter 2 - Engine Service / Maintenance 2 Chapter 3 - Engine Disassembly and Service 3 Chapter 4 - Electrical 4
NOTES: 0
Chapter 1 – General Service Information Safety Service Rules Engine Model / Serial Number Location Engine Fastener Torque Specification General Specifications Engine Specifications Troubleshooting 1 2 3 3 4 5 5 6 1
Safety Safety Information This symbol means WARNING or PERSONAL SAFETY INSTRUCTION – read the instruction because it has to do with your safety. Failure to comply with the instruction may result in personal injury or even death. This manual is intended as a service and repair manual only. The safety instructions provided herein are for troubleshooting, service, and repair of the Toro engine. The Toro operator’s manual contains safety information and operating tips for safe operating practices.
1 Service Rules 1. Only use genuine Toro parts and lubrication products. 2. Always install new gaskets, O-rings and seals when assembling engine. 3. Always torque fasteners to specification and in sequence. 4. Always lubricate friction components with clean engine oil or engine assembly lube when assembling engine.
Engine Fastener Torque Specifications Torque Item Specification Oil Drain Plug 17 ft-lbs (23 Nm) Connecting Rod Bolts 8.5 ft-lbs (12 Nm) Crankcase & Cover Bolts 17.5 ft-lbs (24 Nm) Valve Lash Lock Nut 11 ft-lbs (15 Nm) Rocker Arm Studs 22 ft-lbs (30 Nm) Spark Plug 22 ft-lbs (30 Nm) Valve Cover Bolts 7 ft-lbs (10 Nm) Starter Bolts 7 ft-lbs (10 Nm) Recoil Mounting Bolts 7 ft-lbs (10 Nm) Cylinder Head Bolt 25 ft-lbs (34 Nm) Heater Box Nuts 7 ft-lbs (10 Nm) Flywheel Nut 62.
1 General Specifications MODEL Engine Type LC168F-1 (Recoil Start) LC168FD-1 (Electric Start) OHV Single Cylinder, Four Stroke, Forced Air Cooling Displacement (cc) 163 Bore x Stroke (mm) 68 x 45 Compression Ratio 8.5:1 Engine Operating RPM 3550 - 3850 RPM Oil Capacity 20 oz. (0.6 l) Fuel Type Unleaded Gasoline, 87 Octane Ignition System T.C.I Transistorized Magneto Lubrication System Splash Cylinder Aluminum with Cast Iron Bore Engine Specifications Spark Plug Gap 0.0275 - 0.
Troubleshooting Hard Starting / Poor Running - Incorrect Fuel (Level, Age, Octane, Ethanol Content) - Fuel System Contamination and / or debris in Carburetor - Incorrect Oil Level - Spark Plug (Incorrect Gap, Fouled, Loose or Faulty) - Air Intake System Leaks - Ignition Coil to Flywheel Gap Incorrect - Weak / No Spark - Choke / Linkage - Operating RPM Incorrect - Governor Adjustment Incorrect - Engine Valve Clearance out of Specification - Low Compression or Excessive Leakdown Overheating - Incorrect Oil L
Chapter 2 - Engine Service / Maintenance Engine Oil Change Procedure Spark Plug Service Valve Clearance Inspection and Adjustment Engine Governor – Zero Point Setting Engine RPM Adjustment Fuel Filter Replacement 7 8 9 10 11 11 12 2
Engine Oil Change Procedure 1. Run engine to warm engine oil. 2. Remove the ignition key. NOTE: Ensure fuel system contains no fuel to prevent leakage when engine is tipped. 3. Position oil drain pan under oil drain plug. 4. Remove the oil fill / check cap. 5. Remove the oil drain plug. 6. Tip engine slightly backwards (if necessary) to completely drain the engine oil. 7. Install the oil drain plug - torque to 17 ft-lbs (23 Nm). 8. Add oil through the oil check / fill hole.
2 Spark Plug Service NOTE: Spark plugs of the wrong size or incorrect heat range can cause severe engine damage. NOTE: The shrouding, discharge chute and handle may need to be removed to access the spark plug. High Voltage Ignition Systems can be Dangerous - Use Caution when Servicing Ignition Systems 1. Disconnect the spark plug boot and thoroughly clean the spark plug area. 2. Remove the spark plug from the engine. 3.
Valve Clearance Inspection and Adjustment NOTE: Valve clearance inspection and adjustment must be done with the engine cold . 1. Rotate engine to TDC (top-dead-center) of the compression stroke. 2. Remove the valve cover. Be sure both valves are completely closed and the decompression arm is not holding the valve open. 3. Measure the clearance between the rotator and the valve stem with a feeler gauge.
Engine Governor – Zero Point Setting 2 1. Loosen but do not remove the governor pinch bolt nut (A). 2. Move the governor arm (B) towards the carburetor to fully open the throttle valve. Firmly hold the governor arm in this position. 3. Rotate the governor arm shaft (C) fully clockwise and secure it in this position with a pair of pliers. 4. Tighten the governor arm pinch bolt (A) and nut to specification - 7.5 ft-lbs (10 Nm). 5. Verify that the governor arm and throttle valve move freely. 6.
Fuel Filter and Hose Replacement - Fuel is Extremely Flammable - Use Extreme Caution When Servicing Fuel System 1. Drain the fuel tank into an approved container. NOTE: Ensure fuel system contains no fuel to prevent leakage when the fuel filter is replaced. 2. Release the fuel filter / fuel hose clamps (A) and slide them away from the fittings. 3. Remove the fuel filter / hose asm. from the engine. 4. Properly install new fuel filter / hose asm. and hose clamps (A). A 5. Re-fill tank with fresh fuel. 6.
Chapter 3 - Engine Disassembly and Service Engine Service – Upper End 14-23 Muffler / Heat Shield Exploded View Heater Box Exploded View Carburetor Mounting Carburetor Exploded View Recoil Asm.
Engine Service – Upper End Muffler / Heat Shield Exploded View Muffler / Exhaust Pipe 22 ft-lbs (30Nm) 7 ft-lbs (10Nm) Gasket Muffler Mount Bracket 14
3 Heater Box Exploded View Wing Nut Cover Spacer and Washer Base Heater Box 7 ft-lbs (10Nm) Gasket Note Orientation for Assembly t Up 15
Carburetor Mounting Cylinder Head Gasket Primer Hose Spacer Gasket Fuel Hose Note Orientation for Assembly t 7 ft-lbs (10Nm) 16
3 Carburetor Exploded View . O-ring Throttle Shaft Jet Stop Screw Choke Lever Choke Plate Nozzle Main Jet Needle and Asm.
Recoil Asm. Exploded View Shroud and Recoil Asm.
3 Starter / Flywheel / Coil Exploded View Blower Shroud Electric Start Starter Asm. (Optional) Blower Shroud Recoil Start 7 ft-lbs (10 Nm) Flywheel Cup Ignition Coil Asm. Side Plate 7 ft-lbs (10 Nm) Fan Flywheel Nut 62.5 ft-lbs (85 Nm) Image for Reference Only Starter Removal 1. Remove recoil and shroud asm. 2. Remove flywheel with an appropriate puller. 3. Remove the fasteners securing the starter motor to the engine and remove starter asm.
Cylinder Head Exploded View and Service Information Cylinder Head Bolt Torque Sequence: 1. Initially Torque the (4) Cylinder Head Bolts in a Crisscross Pattern to 10 ft-lbs (14 Nm). 2. Evenly Torque the (4) Cylinder Head Bolts in a Crisscross Pattern to 25 ft-lbs (34 Nm). Spark Plug Cylinder Head Bolts 25 ft-lbs (34 Nm) 7 ft-lbs (10 Nm) Dowl Gasket Shroud Valve Cover Gasket Cylinder Head 7 ft-lbs (10 Nm) NOTE: The only internal parts available for this engine are gaskets and seals.
Cylinder Head / Valves Exploded View and Service Information Exhaust Valve Valve Spring Retainer Rotator Intake Valve Rocker Arm Push Rod Pivot Valve Lash Lock Nut 11 ft-lbs (15 Nm) NOTE: Stud 22 ft-lbs (30 Nm) The only internal parts available for this engine are gaskets and seals.
Valve Seat Width Inspection Remove carbon deposits from the combustion chamber. Inspect the valve seats for pitting or other damage. Standard Service limit 0.03149” (0.8mm) 0.07874” (2.0mm) Cylinder Head Warp Inspection - Remove carbon deposits from the combustion chamber. STRAIGHT EDGE - Clean off any gasket material from the cylinder head surface. - Check the spark plug hole and valve areas for cracks.
3 Valve Seat Reconditioning 1. Thoroughly clean the combustion chamber and valve seats to remove carbon deposits. 2. Apply a light coat of Prussian Blue or erasable felt-tipped marker ink to the valve faces. 3. Properly install valves, springs and keepers. Manually open the valves, then and snap them closed against their seats several times. Be sure the valves do not rotate on the seat. Remove the valve assemblies. The transferred marking compound will show any area of the seat that is not concentric.
Engine Service – Lower End Crankcase Exploded View and Service Information 17.5 ft-lbs (24 Nm) Seal Bearing Gasket Crankshaft Key Governor Bearing Governor Shaft Crankcase Cover Camshaft 8.5 ft-lbs (12 Nm) Piston Asm. Seal Triangular Mark to Face Down NOTE: The only internal parts available for this engine are gaskets and seals.
3 Governor Exploded View Clip Weight Slider Governor Gear Washer Washer Pin Governor Shaft Clip Shaft NOTE: The only internal parts available for this engine are gaskets and seals.
Piston / Connecting Rod Exploded View and Service Information Second Ring / Gap Piston Rotation Arrow Install Piston Ring Markings “UP” Oil Rings Top Ring / Gap Stagger Scraper Rings 8.
3 Valve Timing Crankshaft Timing Marks Camshaft 27
NOTES: 28
Chapter 4 – Electrical System Information Ignition Coil Gap Adjustment Ignition Coil Resistance Inspection Spark Testing 31 32 32 29 4
Ignition Coil Gap Adjustment High Voltage Ignition Systems can be Dangerous - Use Caution when Servicing Ignition Systems 1. Install the ignition coil and lightly tighten the ignition coil mounting bolts. 2. Rotate engine so ignition coil is aligned with the magnet portion of the flywheel. 3. Insert the feeler gauge between the flywheel and coil. 4. Adjust the ignition coil gap at both side of the coil. 5.
4 Ignition Coil Resistance Inspection Primary Coil Place Ohm meter leads between the harness connection A lead and the exposed metal coil leg. A - Primary Coil Resistance 1.0-1.6 Ω Secondary Coil Place Ohm meter leads between exposed metal coil leg and the spark plug terminal connection. B - Secondary Coil Resistance B 15.
RESIDENTIAL PRODUCTS Form Number: 492-9230 32
