Problem

 

Possible Causes

 

Probable Solutions

 

 

Engine misfires

1. Spark plug cap loose.

1.

Check wire connections.

 

 

 

 

2.

Incorrect spark plug gap or

2.

Re-gap or replace spark plug.

 

 

 

 

damaged spark plug.

 

 

 

 

 

3.

Defective spark plug cap.

3.

Replace spark plug cap.

 

SAFETY

 

4.

Old or low quality gasoline.

4.

Use only fresh 87+ octane

 

 

 

 

 

 

 

 

unleaded gasoline.

 

 

 

 

 

 

Do not use gasoline with more than

 

 

 

 

 

 

10% ethanol (E15, E20, E85, etc.).

 

 

 

5.

Incorrect compression.

5.

Diagnose and repair compression.

 

 

 

 

 

 

(Use Engine will not start:

 

 

 

 

 

 

COMPRESSION RELATED section.)

 

 

Engine stops

1.

Low oil shutdown.

1.

Fill engine oil to proper level. Check

 

 

suddenly

 

 

 

engine oil before EVERY use.

 

 

 

 

 

 

 

2.

Fuel tank empty or full of impure or low

2.

Fill fuel tank with fresh 87+ octane

 

 

 

 

 

 

quality gasoline.

 

unleaded gasoline.

 

 

 

 

 

 

Do not use gasoline with more than

 

 

 

 

 

 

10% ethanol (E15, E20, E85, etc.).

 

 

 

3.

Defective fuel tank cap creating

3.

Test/replace fuel tank cap.

 

SETUP

 

 

vacuum, preventing proper fuel flow.

 

 

 

 

 

 

 

 

 

 

4.

Faulty magneto.

4.

Have qualified technician service magneto.

 

 

 

5.

Disconnected or improperly

5.

Secure spark plug cap.

 

 

 

 

connected spark plug cap.

 

 

 

 

Engine stops when

1.

Dirty air filter

1.

Clean or replace element.

 

 

under heavy load

2. Engine running cold.

2.

Allow engine to warm up prior

 

 

 

 

 

 

to operating equipment.

 

 

Engine knocks

1.

Old or low quality gasoline.

1.

Fill fuel tank with fresh 87+ octane

 

 

 

 

 

 

unleaded gasoline.

 

 

 

 

 

 

 

 

 

 

 

Do not use gasoline with more than

 

 

 

 

 

 

10% ethanol (E15, E20, E85, etc.).

 

 

 

2.

Engine overloaded.

2.

Do not exceed equipment’s load rating.

 

OPERATION

 

3.

Incorrect spark timing, deposit

3.

Have qualified technician

 

 

 

 

 

 

buildup, worn engine, or other

 

diagnose and service engine.

 

 

 

 

mechanical problems.

 

 

 

 

Engine backfires

1.

Impure or low quality gasoline.

1.

Fill fuel tank with fresh 87+ octane

 

 

 

 

 

 

unleaded gasoline.

 

 

 

 

 

 

Do not use gasoline with more than

 

 

 

 

 

 

10% ethanol (E15, E20, E85, etc.).

 

 

 

2.

Engine too cold.

2.

Use cold weather fuel and oil

 

 

 

 

 

 

additives to prevent backfiring.

 

 

 

3.

Intake valve stuck or overheated engine.

3.

Have qualified technician

 

 

 

 

 

 

diagnose and service engine.

 

 

 

4.

Incorrect timing.

4.

Check engine timing.

 

 

Follow all safety precautions whenever diagnosing or servicing the equipment or engine.

MAINTENANCE

Horizontal Engines

For technical questions, please call 1-800-520-0882.

Page 19

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Harbor Freight Tools 68306, 68120 owner manual Use Engine will not start Compression Related section
Page 18 Page 20

68306, 68120 specifications

Harbor Freight Tools is known for offering a wide range of tools and equipment at competitive prices, making it a favored choice for DIY enthusiasts and professionals alike. Among their extensive catalog, the 68120 and 68306 models stand out for their performance and versatility.

The Harbor Freight Tools 68120 is a 1,000-pound capacity engine hoist designed for lifting heavy engines and machinery with ease. One of its main features is its compact design, which allows for great maneuverability in tight spaces. The hoist operates on a hydraulic system, providing smooth lifting capabilities that ensure safety and reliability. The adjustable boom extends from 45 to 70 inches, enabling users to reach a variety of engine positions without hassle.

Additionally, the 68120 boasts a sturdy steel construction that adds to its durability and longevity. It also includes oversized wheels, making it effortless to move around the garage or shop without damaging floors. A safety latch is integrated into the main boom, which secures loads during operation, providing peace of mind to the user. The hoist is designed with efficiency in mind, enabling users to complete tasks more quickly and effectively.

The 68306 model is a pneumatic tire changer, specifically designed for hassle-free tire changing on various vehicles. This tool features an impressive range of compatibility, accommodating tires from 10 to 21 inches in diameter. The robust construction includes heavy-duty steel components, ensuring that it can withstand the rigorous demands of repeated use in a busy workshop or in mobile situations.

One of the standout features of the 68306 is its pneumatic operation, which allows for quick and effortless tire mounting and demounting. The user-friendly design includes an adjustable arm for varying tire widths, ensuring versatility for different vehicle types. Moreover, the incorporated bead breaker makes it easy to separate tires from their wheels without exerting excessive force.

In summary, both the Harbor Freight Tools 68120 and 68306 provide exceptional value for users seeking reliable, efficient, and robust tools to enhance their automotive repairs. With their advanced features and durable designs, they exemplify the high-quality offerings available from Harbor Freight, catering to both casual and professional users. Whether you need to lift heavy engines or change tires quickly, these tools stand ready to deliver performance and convenience.
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