Sierra 18-5752 Universal 8mm Spark Plug Boot, OEM Equivalent 580339, with Terminal Connector

The Sierra 18-5752 is a universal 8mm spark plug boot supplied complete with a terminal connector, designed to make a secure, weather-resistant connection between an ignition wire and the spark plug on marine engines. The boot's job is to shield the plug connection from moisture, salt spray, and vibration common in the marine environment while maintaining a tight electrical seal so the engine fires reliably. Because it is a universal-fit boot rated for 8mm wire, it is built to be paired during ignition wire replacement, tune-ups, or when repairing a damaged or deteriorated boot on an existing wire set rather than replacing the entire harness. The included terminal connector means no separate crimp fitting is needed to complete the installation, simplifying the repair to a single part. Sierra states that its products are engineered to meet the demands of high-horsepower engines and to hold up in harsh marine conditions, and that they meet or exceed the original equipment part being replaced. This boot is sold as a single unit and is a straightforward, low-cost way to restore a clean ignition connection on outboard and other marine engines using 8mm plug wire.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5752
• Product Type: Universal Spark Plug Boot
• Size: 8 mm
• Included Components: Terminal Connector
• OEM Equivalent Part Number: 580339
• Weight: 0.07 pounds
• UPC: 808282244484
• Vehicle Service Type: Watercraft
• Quantity: 1

Fitment

Universal 8mm spark plug boot; fits applications using 8mm ignition wire.

Replaces (OEM)

• 580339

Frequently Asked Questions

What size wire does the Sierra 18-5752 spark plug boot fit? It is sized for 8mm ignition wire, matching the thread and wire diameter used on many marine engines.

Does this boot come with a connector, or do I need to buy one separately? The Sierra 18-5752 ships complete with a terminal connector, so no separate crimp fitting is required to finish the installation.

Is the 18-5752 boot made for a specific engine brand? No, it is a universal-fit 8mm spark plug boot rather than a boot molded for one specific engine or brand.

What is the OEM equivalent part number for the Sierra 18-5752? 580339 is listed as the OEM equivalent part number for the Sierra 18-5752 spark plug boot.

How much does the 18-5752 spark plug boot weigh? The Sierra 18-5752 weighs 0.07 pounds.

Can I use this boot on a boat that runs in saltwater? Yes, Sierra states its parts are engineered to hold up in the harsh marine environment, which includes saltwater exposure.

How many boots come in one package? One Sierra 18-5752 spark plug boot is included per unit; the quantity is 1.

Will this boot work as well as the original equipment part? Sierra states its products meet or exceed the original equipment part they replace, which applies to the 18-5752 boot.

When would I need to replace a spark plug boot like the 18-5752? A spark plug boot typically needs replacement when it cracks, hardens, or no longer seats tightly, causing a weak or intermittent ignition connection; the 18-5752 is used to restore that seal.

What is included in the box with the 18-5752? The package includes one universal 8mm spark plug boot with its terminal connector already attached, ready to install on 8mm ignition wire.