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Description

Johnson/Evinrude Flywheel Nut 0326111 – Secure the Flywheel to the Crankshaft

The Flywheel Nut 326111 is used on select Johnson and Evinrude outboard engines to secure the flywheel to the crankshaft.

The flywheel plays a critical role in the ignition and rotating assembly. It must remain firmly seated on the crankshaft taper so ignition timing, rotating balance, and flywheel alignment remain correct during operation.

What the Flywheel Nut Does

The flywheel nut provides the clamping force needed to hold the flywheel securely against the crankshaft taper.

Proper flywheel retention helps maintain:

• Correct flywheel position
• Stable ignition timing reference
• Proper crankshaft-to-flywheel engagement
• Reliable high-RPM operation
• Secure operation of the rotating assembly

The flywheel should not depend on the flywheel key alone to resist engine torque. Proper taper fit and correct nut torque are essential to keeping the assembly secure.

Common Reasons to Replace a Flywheel Nut

Replacement should be considered when:

• The hex flats are rounded
• Threads are damaged
• Corrosion is present
• The nut has been overtightened or distorted
• The flywheel has come loose
• The nut no longer threads smoothly
• The crankshaft or flywheel is being serviced
• The original hardware is missing
• The engine is undergoing a complete rebuild

A questionable flywheel nut is inexpensive compared with the damage that can occur if the flywheel loosens during operation.

Common Signs of Flywheel Retention Problems

Problems with the nut, crankshaft taper, key, or flywheel fit may contribute to:

• Flywheel movement
• Abnormal vibration
• Ignition timing shifting unexpectedly
• Damaged flywheel key
• Difficulty keeping the flywheel tight
• Noise from the upper crankshaft/flywheel area
• Visible fretting or movement at the taper
• Engine performance changing after flywheel service

If the flywheel has loosened, do not simply tighten the nut and continue running the engine. The flywheel taper, crankshaft taper, key, and keyway should all be inspected for damage.

Key Features & Benefits

• Secures the Flywheel – Provides the clamping force needed to retain the flywheel on the crankshaft
• Supports Reliable Ignition Operation – Helps keep the flywheel in the correct relationship to the crankshaft
• Important for High-RPM Reliability – Proper flywheel retention is especially critical on performance engines
• Ideal for Ignition Service – Useful whenever the flywheel is removed
• Powerhead Rebuild Component – Common replacement hardware during crankshaft and engine service

Flywheel Service Considerations

Whenever the flywheel is removed, inspect:

• Flywheel nut threads
• Crankshaft threads
• Crankshaft taper
• Flywheel taper
• Flywheel key
• Keyway
• Flywheel condition

The crankshaft and flywheel tapers should be clean and free of oil, corrosion, burrs, or damage before reassembly.

Always tighten the flywheel nut to the torque specification listed for your exact engine model.

Why Proper Torque Matters

Too little torque can allow the flywheel to move on the crankshaft taper.

Too much torque can damage threads or components.

An incorrectly secured flywheel can lead to:

• Sheared flywheel key
• Damaged taper
• Ignition timing problems
• Flywheel wobble
• Crankshaft damage
• Severe engine damage in extreme cases

Using the proper service procedure and torque specification is essential.

Performance & Racing Considerations

For performance and racing outboards, flywheel retention becomes even more important because the engine operates at sustained high RPM.

At Liquid Revolutions, we know that seemingly simple hardware can become a major reliability issue when an engine is being pushed hard. A damaged flywheel nut, worn keyway, or improperly seated flywheel can quickly turn into a race-ending problem.

Whenever a performance engine has the flywheel removed, inspect the nut and mating components carefully before reassembly.

A properly installed 326111 Flywheel Nut helps keep the flywheel securely seated, the ignition system properly indexed, and the rotating assembly reliable throughout the RPM range.