RESIDENTIAL PRODUCTS TWO STAGE SNOW ENGINE SERVICE MANUAL LC175FDS (265cc) LC180FDS (302cc)
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
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Chapter 1 – General Service Information Safety Service Rules Engine Model / Serial Number Location Engine Fastener Torque Specification General Specifications Engine Specifications - 265cc / 175FDS Engine Specifications - 302cc / 180FDS Troubleshooting 1 2 3 3 4 5 6 7 8 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 Model / Serial Number Location The engine model and serial number are stamped into the crankcase, above the oil drain.
Engine Fastener Torque Specifications Item Fastener Size Torque Specification Cylinder Head Bolts M10 35 ft-lbs (48 Nm) Connecting Rod Bolts M8 14 ft-lbs (19Nm) Flywheel Nut M16 80 ft-lbs (109 Nm) Valve Adjust Lock Nut M6 11 ft-lbs (15 Nm) Rocker Arm Studs M8 22 ft-lbs (30 Nm) Crankcase Cover Bolts M8 22 ft-lbs (30 Nm) Exhaust Studs M8 6 ft-lbs (8 Nm) Exhaust Pipe Nuts M8 22 ft-lbs (30 Nm) Air Cleaner Nuts M6 7.
1 General Specifications MODEL Engine Type Displacement (cc) 265cc / LC175FDS 302cc / LC180FDS OHV Single Cylinder, Four Stroke, Forced Air Cooling 265 302 Bore × Stroke (mm) 75×60 80×60 Compression Ratio 8.2:1 8.9:1 66.1 lbs. (30Kg) 70.5 lbs. (32Kg) Dry Weight Engine Idle RPM 1700 - 2000 RPM Engine Operating RPM 3200 – 3400 RPM Oil Capacity 30 - 32 oz. (0.89 - 0.95 l) Fuel Type Unleaded Gasoline, 87 Octane Fuel Capacity 1.05 Gallons (4l) Engine Rotation Counter-clockwise (from P.
Engine Specifications - 265cc / 175FDS Part Item Standard Service Limit Cylinder Sleeve Inside Diameter 2.953 - 2.954” (75.015-75.025 mm) 2.959” (75.17 mm) Skirt Outside Diameter 2.951 - 2.952” (74.970-74.980 mm) Clearance to Cylinder 0.00059 - 0.002” (0.015-0.052 mm) 0.0047” (0.12 mm) Piston Pin Bore Inside Diameter 0.7087 - 0.7089” (18.002-18.008 mm) 0.7103” (18.042 mm) Piston Pin Clearance 0.000078 - 0.00055” (0.002-0.014mm) 0.0031” (0.08 mm) Outside Diameter 0.7083 - 0.7085” (17.
1 Engine Specifications - 302cc / 180FDS Part Item Standard Service Limit Cylinder Sleeve Inside Diameter 3.4651 - 3.4655” (80.015-80.025 mm) 3.4712” (80.17 mm) Skirt Outside Diameter 3.1484 - 3.1488” (79.97-79.98 mm) 3.1437” (79.85 mm) Clearance to Cylinder 0.00059 - 0.002” (0.015-0.052 mm) 0.0047” (0.12 mm) Piston Pin Bore Inside Diameter 0.7087 - 0.7089” (18.002-18.008 mm) 0.7103” (18.042 mm) Piston Pin Clearance 0.000078 - 0.00055” (0.002-0.014mm) 0.0031” (0.
Troubleshooting Hard Starting / Poor Running - Incorrect Fuel (Level, Age, Octane, Ethanol Content) - Fuel System Contamination and / or Carburetor Debris - Primer System Incorrect Function - Incorrect Oil Level - Spark Plug (Incorrect Gap, Fouled, Loose or Faulty) - Air Intake Restriction - 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 Compres
Chapter 2 - Engine Service / Maintenance Engine Oil Change Procedure Spark Plug Service Valve Clearance Inspection and Adjustment Engine Governor – Zero Point Setting Engine Idle Speed Fuel Filter Replacement 1 9 10 11 12 13 14 15 2
Engine Oil Change Procedure 1. Run engine to warm engine oil. 2. Remove the ignition key. 3. Remove oil dipstick. 4. Position oil drain pan under oil drain plug. 5. Firmly hold the oil drain tube (A) in position. 6. Completely drain the engine oil. 7. Firmly hold the oil drain tube (A) in position. 8. Add oil through the dipstick tube. Wipe the dipstick clean and fully insert it into the dipstick tube. 9.
2 Spark Plug Service NOTE: Spark plugs of the wrong size or incorrect heat range can cause severe engine damage. 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. Inspect the spark plug for excessively worn electrodes, chips or cracks in the insulator, or excessive deposits. 4. Measure the electrode gap and adjust if necessary.
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 rocker arm and the valve stem with a feeler gauge. Intake: 0.0059” (0.15 mm) Exhaust: 0.0078” (0.20 mm) 4.
Engine Governor – Zero Point Setting 2 1. Remove the front and rear panel to gain access to the governor arm and throttle limit screw. 2. Loosen but do not remove the governor arm pinch bolt and nut. 3. Move the governor arm away the carburetor to fully open the throttle valve. Firmly hold the governor arm in this position. 4. Rotate the governor arm shaft fully counterclockwise and secure it in this position with a pair of pliers. 5. Tighten the governor arm pinch bolt and nut to Specification - 7.
Engine Idle Speed 1. Start the engine and allow it to warm to normal operating temperature. 2. With the engine at low idle, just before the kill switch is activated, adjust the throttle stop screw to achieve the recommended engine idle speed.
2 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 leak 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 clamps (A). 5. Re-fill tank with fresh fuel. 6.
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Chapter 3 - Engine Disassembly and Service Engine Service – Upper End 18-31 Heater Box Exploded View Carburetor Mounting Carburetor Exploded View Fuel Tank / Engine Cover / Rear Panel Exploded View Engine Cover / Front Panel / Fuel Tank / Fuel Hose View Muffler / Heat Shield Exploded View Governor and Throttle Control Exploded View Recoil Asm.
Engine Service – Upper End Heater Box Exploded View Ignition Switch and Key Gasket Heater Box Insert Heater Box Cover Carburetor Mounting Nuts 7 ft-lbs (10 Nm) 18 Primer Bulb
3 Carburetor Mounting Governor Rod Throttle Return Spring Note spacer orientation for installation Spacer Fuel Hose Primer Asm.
Carburetor Exploded View Primer Asm. O ring Choke Lever Asm. Jet Primer Hose Throttle Stop Screw Main Jet and Nozzle Float Needle Asm.
3 Fuel Tank / Engine Cover / Rear Panel Exploded View Fuel Tank Mounting Hardware 7 ft-lbs (10 Nm) Dip Stick Fuel Tank Cover Fuel Tank Clip Rear Panel 19 ft-lbs (26 Nm) Fuel Tank Mounting Hardware 7 ft-lbs (10 Nm) 7 ft-lbs (10 Nm) 21
Engine Cover / Front Panel / Fuel Tank / Fuel Hose Exploded View 7 ft-lbs (10 Nm) 19 ft-lbs (26 Nm) Fuel Tank Mounting Bracket Starter Switch Bracket Fuel Hose Fuel Filter Fuel Hose and Sleeve 7 ft-lbs (10 Nm) 7 ft-lbs (10 Nm) Front Panel Fuel Shut Off Valve 18 in-lbs (2 Nm) 7 ft-lbs (10 Nm) 22
3 Muffler / Heat Shield Exploded View 7 ft-lbs (10 Nm) Muffler Shield Muffler Protector 19 ft-lbs (26 Nm) Muffler Exhaust Pipe Gasket 7 ft-lbs (10 Nm) 22 ft-lbs (30 Nm) 23
Governor and Throttle Control Asm. Exploded View Throttle Control Asm.
3 Recoil Asm. Exploded View Upper Heat Shroud Shroud and Recoil Asm. 7 ft-lbs (10 Nm) 7 ft-lbs (10 Nm) 7 ft-lbs (10 Nm) Set Screw Clip Spring Guide Recoil Asm.
Starter / Flywheel / Coil Exploded View 12 in-lbs (1.5 Nm) Starter Asm. 7 ft-lbs (10 Nm) Rubber Grommet 80 ft-lbs (109 Nm) Stator Ignition Coil Asm.
Cylinder Head Exploded View and Service Information Spark Plug 22 ft-lbs (30 Nm) 3 Gasket Gasket Valve Cover 7 ft-lbs (10 Nm) Breather Tube Shroud 7 ft-lbs (10 Nm) 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 35 ft-lbs (48 Nm).
Cylinder Head / Valves Exploded View and Service Information Exhaust Valve Spring Seat Valve Spring Seal Retainer Valve Keeper Valve Keeper Rotator Intake Valve Push Rod Guide Plate Pivot Lock Nut 11 ft-lbs (15 Nm) Pivot Studs 23 ft-lbs (31 Nm) Rocker Arm 28
3 Valve Spring Free Length Specification Standard Service Limit 1.535” (39 mm) 1.476” (37.5 mm) 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 - 0.0393” 0.0591” (0.8-1.0 mm) (1.5 mm) Cylinder Head Warp Inspection - Remove carbon deposits from the combustion chamber. - Clean off any gasket material from the STRAIGHT EDGE cylinder head surface.
Valve Stem Inspection Inspect each valve for face irregularities, bending or abnormal wear. Valve Stem Diameter Specification Intake Exhaust Standard Service Limit 0.2584 - 0.2590” 0.2535” (6.565-6.58 mm) (6.44 mm) 0.2577 - 0.2583” 0.252” (6.545-6.56 mm) (6.40 mm) Valve Guide Inspection Ream the exhaust valve guide to remove any carbon deposits before measuring. Valve Guide ID Specification: Standard Service Limit 0.2598 - 0.2604” 0.2624” (6.60-6.615 mm) (6.
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 Crankcase Cover Seal Governor Governor Drive Gear Crankshaft 14 ft-lbs (19Nm) 22 ft-lbs (30 Nm) 22 ft-lbs (30 Nm) Rod Cap Bearing Gasket Valve Tappets Camshaft Piston Asm.
3 Governor Exploded View Crankcase Shaft Pin Washer Governor Shaft Weight Slider Clip Washer Governor Gear Pin 33
Piston / Connecting Rod Exploded View and Service Information Second Ring / Gap Piston Rotation Arrow Install Piston Ring with Markings “UP” Oil Rings Top Ring / Gap Stagger Scraper Rings 150°～ 210° from the Oil Ring Connecting Rod Piston Pin Piston Pin Clip Oil Splash Spoon Point Down to Match Piston Arrow Triangular Mark to Face “DOWN” Towards Push Rods Clip Gap Piston Cut-out 34
3 Crankshaft / Camshaft Timing Crankshaft Timing Marks Camshaft 35
Crankshaft Bearing Free Play 1. Clean the bearing in solvent and dry it. 2. Spin the bearing by hand and check for play. Replace the bearing if it is noisy or has excessive free play. Piston Pin OD Standard Service Limit 0.7083 - 0.7085” 0.7067” (17.992-17.998 mm) (17.95 mm) Cylinder Inside Diameter Inspect cylinder inside diameter for taper and out of round with a bore gauge.
3 Piston Skirt Outside Diameter Measure and the piston skirt outside diameter 10mm from the skirt base and 90°to piston pin hole. Engine Standard Service Limit 175FDS-1 2.951 - 2.952” 2.939” (74.970-74.980 mm) (74.65 mm) 3.1484 - 3.1488” 3.1437” (79.97-79.98 mm) (79.85 mm) 180FDS-1 Piston to Cylinder Clearance Specification Engine Standard Service Limit 175FDS-1 0.00059 - 0.002” 0.0047” 180FDS-1 (0.015-0.052 mm) (0.
Piston Ring End Gap Top and Middle Rings Engine Standard Service Limit 175FDS-1 0.0079 - 0.0157” 0.0394” 180FDS-1 (0.2-0.4 mm) (1.0 mm) Engine Standard Service Limit 175FDS-1 0.0079 - 0.0275” 0.0394” 180FDS-1 (0.2-0.7 mm) (1.0 mm) Oil Ring Use the piston to position the rings squarely 1” down from the top of the cylinder. Connecting Rod Small End ID Engine Standard Service Limit 175FDS-1 0.7088 - 0.7093” 0.7114” 180FDS-1 (18.006-18.017 mm) (18.07 mm) .
3 Crankshaft Pin Outside Diameter Engine Standard Service Limit 175FDS-1 1.2979” - 1.2984” 1.296” 180FDS-1 (32.966-32.981 mm) (32.92 mm) Connecting Rod Big End Side Clearance Engine Standard Service Limit 175FDS-1 0.0039 - 0.0275” 0.0394” 180FDS-1 (0.1-0.7 mm) (1.0 mm) Connecting Rod Big End Oil Clearance - Clean oil from the crankshaft and connecting rod. - Use plastic gauge style measuring tool in accordance to the manufactures instructions to measure the oil clearance.
Camshaft Lobe Height Specifications Intake Engine Standard Service Limit 1.2455 - 1.2501” 1.2342” (31.636-31.754 mm) (31.35 mm) 1.257 - 1.264” 1.244” (31.953-32.113 mm) (31.60 mm) Engine Standard Service Limit 175FDS-1 1.2470 - 1.2533” 1.2342” (31.674 -31.834 mm) (31.35 mm) 1.246 - 1.253” 1.232” (31.66 -31.82 mm) (31.30 mm) 175FDS-1 180FDS-1 Exhaust 180FDS-1 Camshaft Journal Outside Diameter Engine Standard Service Limit 175FDS-1 0.6285 - 0.6292” 0.6267” 180FDS-1 (15.966-15.
Chapter 4 – Electrical System Information Ignition Coil Gap Adjustment Ignition Coil Resistance Inspection Spark Testing Stator Resistance Test 42 42 43 43 41 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 igniting 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. Sufficiently tighten the mounting bolts. Ignition Coil Gap 0.011- 0.019” (.3-.
4 Spark Testing - Fuel is Extremely Flammable - Use Extreme Caution When Servicing the Fuel System - High Voltage Ignition Systems can be Dangerous - Use Caution when Servicing Ignition Systems 1. Remove spark plug cap from the spark plug. 2. Remove the spark plug from the engine. 3. Connect the negative (-) electrode of the spark plug (threaded area) to ground (cylinder head cover). 4. Crank the engine and view the electrode gap. Spark should be present when engine is turning over. 5.
RESIDENTIAL PRODUCTS Form Number: 492-9235 44
