Sierra Starter Solenoid 18-5811-1 for Volvo Penta, Mercruiser, Marine Power 3.0L Engines

The Sierra 18-5811-1 is a marine starter solenoid built for late model 3.0L engines equipped with a 14 inch flywheel. It is engineered to work with Volvo Penta, Mercruiser, and Marine Power engine platforms that share this flywheel and engine configuration, providing the high-current switching needed to engage the starter motor reliably in a marine environment.

As a starter solenoid, it acts as the electrical relay between the ignition switch and the starter motor, handling the heavy current draw required to crank the engine while allowing a low-current switch circuit to trigger it. This keeps the ignition switch and wiring protected from the high amperage the starter motor demands. Choosing a solenoid matched to your engine's flywheel size and engine family helps ensure correct fit and dependable starting performance.

The unit ships in package dimensions of 7.8 x 3.9 x 3.7 inches and weighs 1.73 pounds, consistent with a standard marine starter solenoid housing.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5811-1
• Type: Starter Solenoid
• Fitment: Volvo Penta, Mercruiser, Marine Power - Late Model 3.0L Engines with 14 inch Flywheel
• Weight: 1.73 pounds
• Package Dimensions: 7.8 x 3.9 x 3.7 inches
• UPC: 808282378943

Fitment

• Volvo Penta, Mercruiser, and Marine Power late model 3.0L engines with a 14 inch flywheel

Frequently Asked Questions

What engines does the Sierra 18-5811-1 solenoid fit? This solenoid is built for late model 3.0L engines with a 14 inch flywheel, covering Volvo Penta, Mercruiser, and Marine Power engine platforms that use this configuration.

Is the 18-5811-1 a starter solenoid or an ignition solenoid? The 18-5811-1 is a starter solenoid, which switches the high-current circuit needed to engage the starter motor when the ignition is turned to start.

How much does the Sierra 18-5811-1 weigh? The Sierra 18-5811-1 solenoid weighs 1.73 pounds.

What are the package dimensions for this solenoid? The Sierra 18-5811-1 ships in a package measuring 7.8 x 3.9 x 3.7 inches.

Will the 18-5811-1 work on any 3.0L marine engine? It is designed for late model 3.0L engines with a 14 inch flywheel, so confirm your engine has this flywheel size before ordering the 18-5811-1.

Does the 18-5811-1 fit Volvo Penta engines specifically? Yes, Volvo Penta is one of the three engine platforms this solenoid is built to fit, alongside Mercruiser and Marine Power, on late model 3.0L engines with a 14 inch flywheel.

Is the Sierra 18-5811-1 a genuine Sierra part? Yes, the 18-5811-1 is a Sierra branded starter solenoid, identified by Sierra part number 18-5811-1.

What is the UPC for this solenoid? The UPC for the Sierra 18-5811-1 starter solenoid is 808282378943.

What does a starter solenoid do on a marine engine? A starter solenoid like the 18-5811-1 relays high current from the battery to the starter motor when triggered by the ignition switch, allowing the engine to crank without routing full starter current through the ignition wiring.

Does the flywheel size matter when choosing this solenoid? Yes, the Sierra 18-5811-1 is matched to engines with a 14 inch flywheel, so flywheel size is a key fitment factor for this part.