Cylinder Base Nut Wrench – 9/16" | Continental Engine Tool

Designed for cylinder removal, installation, and engine overhaul work, this professional-grade 9/16" Cylinder Base Nut Wrench provides the reach and clearance needed to access hard-to-reach cylinder base nuts on many Continental engine applications.

The 15-inch span reaches around the cylinder barrel, while the extra-thin 0.14" wall allows access in areas where conventional sockets and wrenches may not fit. The 12-point end works with both hex and 12-point nuts, and the 1/2" square drive allows use with a compatible torque wrench or breaker bar.

Forged from 4130 steel, tempered for maximum strength, and finished with industrial chrome plating, this specialty wrench is built for repeated engine maintenance and overhaul use.

Product Features

• Hex Size: 9/16"
• Drive Size: 1/2" square drive
• Span: 15" (381 mm)
• Wall Thickness: 0.14" (3.5 mm)
• 12-point end fits both hex and 12-point nuts
• Long-reach design fits around most engine cylinders
• Thin-wall construction reaches tight cylinder base nut locations
• Forged from high-strength 4130 steel
• Tempered for maximum strength and durability
• Industrial chrome plating improves surface hardness and corrosion resistance
• Quality tested to meet or exceed engine manufacturer torque specifications
  

Continental Engine Compatibility

This 9/16" wrench is commonly used on select:

A-Series: A-50 • A-65 • A-75 • A-80
C-Series: C-75 • C-85 • C-90 • C-125 • C-145
O-Series: O-200 • O-300
GO-Series: GO-300
E-Series: E-165 • E-185 • E-225
IO-Series: IO-360

Fitment Note: Verify the cylinder base nut size on your specific engine before ordering, as hardware and engine configurations may vary.

Ideal for Engine Maintenance

Perfect for:

• Cylinder removal and installation
• Cylinder replacement
• Top overhauls
• Complete engine rebuilds
• Cylinder base nut removal
• Cylinder base nut torquing
• General engine teardown and assembly

Important Torque Note

When using a cylinder base nut wrench with a torque wrench, the extension can affect the actual torque delivered to the fastener. Follow the applicable engine manufacturer's torque procedure and calculate any required torque correction before installation.

Airboat Solutions

A purpose-built specialty tool for maintaining and rebuilding Continental-powered airboat engines where access to cylinder base hardware can be difficult with conventional tools.

Size: 9/16"
Drive: 1/2" Square
Span: 15" (381 mm)
Wall: 0.14" (3.5 mm)
Material: Forged 4130 Steel
Finish: Industrial Chrome Plated