RESIDENTIAL PRODUCTS

SINGLE STAGE SNOW

ENGINE SERVICE MANUAL
LC154FS / LC154FDS (87cc)
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. We are hopeful that you will find this manual a
valuable addition to your service shop. If you have any questions or comments regarding this
manual, please contact us at the following address:

The Toro Company

Residential and Landscape Contractor Service Training Department
8111 Lyndale Avenue South
Bloomington, MN 55420
Chapter 1 – General Service Information 1

Chapter 2 - Engine Service / Maintenance 2

Chapter 3 - Engine Disassembly and Service 3

Chapter 4 - Electrical 4
NOTES:
Chapter 1 – General Service Information 1

Safety 2
Service Rules 3
Engine Model / Serial Number Location 3
Engine Fastener Torque Specification 4
General Specifications 5
Engine Specifications 5
Troubleshooting 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.

Avoid Unexpected Engine Start - Turn off engine and disconnect the spark plug before servicing engine.

Avoid Lacerations and Amputations - Stay clear of all moving parts while the engine is running.

Avoid Burns - Do not touch the engine, muffler, or other components which may increase in temperature
during operation, while the unit is running or shortly after it has been running.

Avoid Fires and Explosions - Avoid spilling fuel and never smoke while working with any type of fuel or
lubricant. Wipe up any spilled fuel or oil immediately. Never remove the fuel cap or add fuel when the engine
is running. Always use approved, labeled containers for storing or transporting fuel and lubricants.

Avoid Asphyxiation - Never operate an engine in a confined area without proper ventilation.

Avoid Injury From Batteries - Battery acid is poisonous and can cause burns. Avoid contact with skin, eyes,
and clothing. Battery gases can explode. Keep cigarettes, sparks, and flames away from the battery.

Avoid Injury Due To Inferior Parts - Use only original equipment parts to ensure that important safety
criteria are met.

Avoid Injury To Bystanders - Always clear the area of bystanders before starting or testing power
equipment.

Avoid Injury Due To Projectiles - Always clear the area of sticks, rocks, or any other debris that could be
picked up and thrown by the power equipment.

Avoid Modifications - Never alter or modify any part unless it is a factory approved procedure.

2
Service Rules 1
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

2010-2011 - The engine model and serial number are stamped into the crankcase near the electric starter
mounting position on the side of the engine towards the front of machine (shown below).
2012 - The engine model and serial number are stamped into the crankcase near the rear of the machine.

Engine Model and

Serial Numbers

XXX-XXXX XXXXXXXXXXX
Engine Model Serial Number

3
Engine Fastener Torque Specifications

Torque
Item
Specification

Oil Drain Plug 17 ft-lbs (23 Nm)

Connecting Rod Bolts 8.5 ft-lbs (12 Nm)

Cylinder Head Bolt 25 ft-lbs (34 Nm)

Crankcase Cover Bolts 8.5 ft-lbs (12 Nm)

Valve Lash Lock Nut 11 ft-lbs (15 Nm)

Rocker Arm Studs 22 ft-lbs (30 Nm)

Valve Cover Bolts 7 ft-lbs (10 Nm)

Spark Plug 22 ft-lbs (30 Nm)

Cylinder Head Cover Bolts 7 ft-lbs (10 Nm)

Heater Box Nuts 7 ft-lbs (10 Nm)

Flywheel Nut 50 ft-lbs (70 Nm)

Ignition Coil Bolts 7 ft-lbs (10 Nm)

Governor Arm Nut 7 ft-lbs (10 Nm)

Starter Bolts 7 ft-lbs (10 Nm)

Muffler Hex Nuts 22 ft-lbs (30 Nm)

Fuel Tank bolts 7 ft-lbs (10 Nm)

Standard Torque Values

M5 Bolt / Nut 4.5 ft-lbs (6 Nm)

M6 Bolt / Nut 7.5 ft-lbs (10 Nm)

M8 Bolt / Nut 19 ft-lbs (26 Nm)

M10 Bolt / Nut 28 ft-lbs (38 Nm)

M12 Bolt / Nut 41 ft-lbs (55 Nm)

4
General Specifications 1

MODEL LC154FS (Recoil Start) LC154FDS (Electric Start)

Engine Type OHV Single Cylinder, Four Stroke, Forced Air Cooling
Displacement (cc) 87
Bore x Stroke (mm) 54 x 38
Compression Ratio 8.0:1
Oil Capacity 12 oz. (0.35 l)
Engine Operating RPM 4350 - 4650 RPM
Fuel Capacity 0.4 Gal. (1.5l)
Fuel Type Unleaded Gasoline, 87 Octane
Ignition System T.C.I Transistorized Magneto
Lubrication System Splash
Cylinder Aluminum with Cast Iron Bore

Engine Specifications
Part Item Specification
Carburetor Float Height 0.748” (19mm)
Spark Plug Gap Gap 0.0275 - 0.0314” (0.7-0.8 mm)
Intake Cold 0.0059” (0.15 mm)
Valve Clearance
Exhaust Cold 0.0078” (0.20 mm)
Resistance (primary) 1-1.6Ω
Ignition Coil Resistance (secondary) 15K Ω ±15%
Gap to Flywheel 0.011- 0.019” (.3-.5 mm)

NOTE: The only internal parts available for this engine are gaskets and seals.

5
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 Function
- Operating RPM Incorrect
- Governor Adjustment Incorrect
- Engine Valve Clearance out of Specification
- Low Compression or Excessive Leakdown

Overheating
- Incorrect Oil Level
- Cylinder Head Gasket Leak
- Debris Build-Up Restricting Air Flow

6
Chapter 2 - Engine Service / Maintenance 2

Engine Oil Change Procedure 8

Spark Plug Service 9
Valve Clearance Inspection and Adjustment 10
Engine Governor – Zero Point Setting 11
Engine RPM Adjustment 11
Fuel Filter Replacement 12

7
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 leak 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. If necessary, replace drain plug gasket.
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. Wipe the dipstick clean and insert it into the dipstick hole
NOTE: DO NOT fully install / screw in the dipstick to check the oil.
9. Remove the dipstick and check the oil level – Add oil if needed until the proper oil level is reached.
NOTE: DO NOT overfill the engine oil
10. Fully install and tighten the dipstick.
11. Properly dispose of the used engine oil.

Engine Oil Capacity:

12 oz. (0.35 l)

Engine Oil Type:

API classification of SF,SG, SH, SJ, SL, or higher.

8
Spark Plug Service 2
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. Spark Plug Gap: 0.0275 - 0.0314” (0.7-0.8 mm)
5. Install spark plug and torque to specification - 22 ft-lbs (30 Nm).
6. Fully install the spark plug boot onto the spark plug.

0.0275 - 0.0314”

Spark Plug (0.7-0.8 mm)

9
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

Valve Stem
arm and the valve stem with a feeler gauge.

NOTE: Be sure feeler gauge blade is not opening the valve

while measuring valve clearance

Rocker Arm
Intake: 0.0059” (0.15 mm)
Exhaust: 0.0078” (0.20 mm)

4. To adjust valve clearance:

- Hold adjustment bolt and loosen the lock nut. Lock Nut
- Turn adjustment bolt to obtain the specified clearance.
- Hold the adjustment bolt and tighten the lock nut
to specification - 11 ft-lbs (15 Nm).

Image For Reference Only

5. Recheck the clearance and readjust if necessary.

6. Inspect the valve cover gasket and replace if necessary. Install the cylinder head cover and torque
fasteners to specification - 7.5 ft-lbs (10 Nm).

Valve Cover Feeler Gauge

Feeler Gauge

10
Engine Governor – Zero Point Setting 2
1. Remove the (3) fuel tank mounting fasteners to gain access to the governor asm.
Fuel tank removal is not necessary.
2. Loosen but do not remove the governor pinch nut (A).
3. Move the governor arm (B) towards the carburetor to fully open the throttle valve. Firmly hold the
governor arm in this position.
4. Rotate the governor arm shaft (C) fully clockwise and secure it in this position with a pair of pliers.
5. Tighten the governor arm pinch bolt and nut to specification - 7.5 ft-lbs (10 Nm).
6. Verify that the governor arm and throttle valve move freely.
7. Install fuel tank mounting fasteners and torque to specification - 7 ft-lbs (10 Nm).
8. Start and warm engine.
9. Verify the engine operating RPM is set between 4350 – 4650 RPM.

C A

D B

Engine RPM Adjustment

1. Properly set the governor zero point as shown in this manual.
2. Start and warm engine.
3. Attached an appropriate tachometer to the engine.
4. Adjust engine RPM by turning the High Speed Setting Screw (D) located on the engine shroud.

Engine Operating RPM - 4350 - 4650 RPM

11
Fuel Filter and Hose Replacement

- Fuel is Extremely Flammable - Use Extreme Caution When Servicing Fuel System

1. Properly 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 hose clamps (A) and slide them away from the carburetor and fuel tank fittings.

3. Remove the fuel filter / hose asm. from the engine.

4. Unscrew the fuel tank drain fitting (B) from the fuel tank.

5. Install a new fuel tank fitting (B).

6. Install new fuel filter / fuel hose asm. and clamps (A).

7. Re-fill tank with fresh fuel.

8. Verify hose routing and check for leaks.

9. Properly dispose of any unused fuel.

12
Chapter 3 - Engine Disassembly and Service 3

Engine Service – Upper End 14-24

Muffler / Heat Shield Exploded View 14

Fuel Tank Mounting 15
Heater Box Exploded View 16
Carburetor / Governor Mounting 17
Carburetor Exploded View 18
Recoil Asm. Exploded View 19
Starter / Flywheel / Coil Exploded View 20
Cylinder Head Exploded View and Service Information 21
Cylinder Head / Valves Exploded View and Service Information 22
Valve Seat Width Inspection / Cylinder Head Warp Inspection 23
Valve Seat Reconditioning 24

Engine Service – Lower End 25-28

Crankcase Exploded View and Service Information 25

Governor Exploded View 26
Piston / Connecting Rod Exploded View and Service Information 27
Valve Timing 28

NOTE: The only internal parts available for this engine are gaskets and seals.

13
Engine Service – Upper End
Muffler / Heat Shield Exploded View

Self Tapping Screws

Muffler Shield

Muffler

Gasket
27 ft-lbs (30 Nm)

14
Fuel Tank Mounting 3

- Fuel is Extremely Flammable - Use Extreme Caution When Servicing Fuel System

Fuel Tank Fuel Tank

Mounting Hardware
7 ft-lbs (10 Nm)
Shield

Fuel Tank
Mounting Hardware
7 ft-lbs (10 Nm)

Fuel Filter

Fuel Tank
Fitting

15
 Heater Box Exploded View

Key
7 ft-lbs (10 Nm)

18 in-lbs (2 Nm)

Key Switch

Primer Asm.

Switch Carburetor

Note: Verify primer hose is not kinked or pinched upon heater box installation.

16
Carburetor / Governor Mounting Exploded View 3

Governor Arm
7 ft-lbs (10 Nm)
Governor Spring Carburetor Asm.

Clip

Spacer

Gasket

17
Carburetor Exploded View

O-ring
Jet
Throttle Shaft

Choke Lever
Stop Screw

Carburetor Body
Choke Plate
Plate

Main Jet
Needle Asm.
Pin
Gasket

Float
Float Bowl
Gasket

7 ft-lbs (10 Nm)

18
Recoil Asm. Exploded View 3

Shroud and Recoil Asm.

7 ft-lbs (10 Nm)

7 ft-lbs (10 Nm)

Recoil
Set Screw Spring
Clip Asm.

Guide

Ratchet

Spring

19
Starter / Flywheel / Coil Exploded View

Blower Shroud
Electric Start
Starter Asm. Blower Shroud
Recoil Start

7 ft-lbs (10 Nm)

Flywheel

Cup

Ignition Coil Asm.

Side Plate
7 ft-lbs (10 Nm)
Fan

Flywheel Nut
50 ft-lbs (70 Nm)
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.

20
Cylinder Head Exploded View and Service Information 3

Spark Plug
Gasket
22 ft-lbs (30 Nm)

Gasket

Cylinder Head

7 ft-lbs (10 Nm)

Breather
Tube

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).

21
Cylinder Head / Valves Exploded View and Service Information

Valve Spring Exhaust Valve

Push Rod

7 ft-lbs (10 Nm)

Intake Valve

Retainer Guide Plate

Valve Lash Lock Nut
11 ft-lbs (15 Nm)

22
Valve Seat Width Inspection 3
Remove carbon deposits from the combustion chamber. Inspect the valve
seats for pitting or other damage.

Standard Service Limit

0.0315 - 0.0394” 0.0787”
(0.8-1.0 mm) (2.0 mm)

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.
FEELER GAUGE
- Check the cylinder head for warpage with a straight
edge and a feeler gauge as shown.

Service Limit 0.00393” (0.10 mm)

NOTE: If this measurement is out of specification, complete engine replacement is required.

The only internal parts available for this engine are gaskets and seals.

23
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.

4. Use a 45°cutter to remove enough material to produce a smooth and concentric seat. Follow the valve
seat cutter manufacture’s instructions. Turn the cutter clockwise, never counterclockwise. Continue to
turn the cutter as you lift it from the valve seat.

5. Use a 30°~32° and 60° cutter to narrow and adjust the valve seat so that it contacts the middle of the
valve face. The 30°~32° cutter removes material from the top edge. The 60° cutter removes material from
the bottom edge. Be sure that the width of the finished valve seat is within specification.

6. Lap valves in accordance with valve lapping kit instructions.

7. Clean valve and seat of all lapping compound.

Valve Seat Width

Standard Service Limit
0.0315 - 0.0394” 0.0787”
(0.8-1.0 mm) (2.0 mm)

CONTACT TOO HIGH

CONTACT TOO LOW

24
 Engine Service – Lower End 3

Crankcase Exploded View and Service Information

8.5 ft-lbs (12 Nm)

Seal

Bearing
Gasket

Crankshaft Governor
Shaft

Key Governor

Bearing

Crankcase Cover

Camshaft

8.5 ft-lbs
Connecting Rod (12 Nm)
Asm
Oil Splash Spoon
Point Down to
Match Piston Arrow Piston Asm.

Triangular Mark to Face Down

25
Governor Exploded View

Clip

Weight

Slider

Governor Gear

Washer

Washer
Pin
Governor
Shaft Clip

Shaft

26
 Piston / Connecting Rod Exploded View and Service Information 3
Second Ring / Gap
Piston Rotation Arrow

Install Piston Ring

Markings “UP”

Top Ring / Gap Oil Rings

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

27
Valve Timing

Crankshaft
Timing Marks

Camshaft

28
Chapter 4 – Electrical System Information 4

Ignition Coil Gap Adjustment 30

Ignition Coil Resistance Inspection 31
Spark Testing 31

29
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. Torque the ignition coil fasteners to specification - 7 ft-lbs (10 Nm).

0.011- 0.019”
Ignition Coil Gap
(.3-.5 mm)

Gap
Ignition
Coil

Ignition
Coil

30
Ignition Coil Resistance Inspection 4

Primary Coil
Place Ohm meter leads between the harness connection
lead and the exposed metal coil leg. A
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
B - Secondary Coil Resistance 15 KΩ +/- 15%

Image for Reference Only

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 boot 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. Reinstall the spark plug and torque to specification - 22 ft-lbs (30 Nm).
6. Properly install the spark plug boot.

31
 RESIDENTIAL PRODUCTS

Form Number: 492-9233

32