Sierra 18-5906 Starter, Replaces Volvo Penta 840808-0, Fits AQ145B AQ151A AQ151B AQ151C 4 Cylinder

The Sierra 18-5906 is a gear reduction starter built for Volvo Penta 4 cylinder gas inboard engines. It uses a permanent magnet design with an aluminum pinion housing that has 2 threaded mounting holes, and it rotates clockwise to engage the flywheel. Running on a 12 volt system with 1.4 KW of output, this starter is sized to deliver reliable cranking power on the AQ145B, AQ151A, AQ151B, and AQ151C engine applications.

Construction is centered on an aluminum housing for reduced weight compared to heavier cast alternatives, while still standing up to the marine engine bay environment. The unit measures 9.02 x 12.99 x 5.98 inches and weighs 6.76 pounds, so installers replacing an existing Volvo Penta starter can expect a comparable footprint. Fitment covers the AQ145B (1979-1985), and the AQ151A, AQ151B, and AQ151C (1985-1989), all 4 cylinder Volvo Penta engines. This starter directly replaces the OEM Volvo Penta 840808-0 unit, making it a straightforward swap for boat owners and marine technicians servicing these engine models.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5906
• UPC: 030999320100
• Material: Aluminum
• Voltage: 12 Volts
• Wattage: 1.4 KW
• Rotation: Clockwise
• Pinion Housing: Aluminum, 2 threaded mounting holes
• Starter Type: Gear reduction, permanent magnet
• Weight: 6.76 pounds
• Dimensions: 9.02 x 12.99 x 5.98 inches
• OEM Cross Reference: VOLVO 840808-0

Fitment

• Volvo Penta AQ145B, 4 cylinder, 1979-1985
• Volvo Penta AQ151A, 4 cylinder, 1985-1989
• Volvo Penta AQ151B, 4 cylinder, 1985-1989
• Volvo Penta AQ151C, 4 cylinder, 1985-1989

Replaces (OEM)

• VOLVO 840808-0

Frequently Asked Questions

What engines does the Sierra 18-5906 starter fit? The Sierra 18-5906 fits the Volvo Penta AQ145B (1979-1985) and the AQ151A, AQ151B, and AQ151C (1985-1989), all 4 cylinder gas inboard engines.

Is the 18-5906 a direct replacement for the OEM Volvo Penta starter? Yes, the 18-5906 replaces the OEM Volvo Penta 840808-0 starter and is built to install in the same location without modification.

What voltage and power output does this starter have? The Sierra 18-5906 is a 12 volt starter rated at 1.4 KW of output, sized for Volvo Penta 4 cylinder gas engines.

Is the 18-5906 a gear reduction or direct drive starter? It is a gear reduction starter with a permanent magnet motor, which provides strong cranking torque in a compact housing.

What is the pinion housing made of? The pinion housing on the 18-5906 is aluminum and includes 2 threaded mounting holes for installation.

Which direction does the starter motor rotate? The Sierra 18-5906 rotates clockwise, matching the flywheel engagement direction required on the Volvo Penta AQ145B and AQ151 series engines.

How much does the 18-5906 starter weigh? This starter weighs 6.76 pounds.

What are the dimensions of the Sierra 18-5906? The 18-5906 measures 9.02 x 12.99 x 5.98 inches.

Will the 18-5906 fit a 6 cylinder Volvo Penta engine? The Sierra 18-5906 is listed for the Volvo Penta AQ145B and AQ151A/AQ151B/AQ151C, which are 4 cylinder engines.

Does the 18-5906 come with mounting hardware? The product includes the starter unit itself with an aluminum pinion housing featuring 2 threaded mounting holes for attachment to the engine bracket.

Is Sierra a reputable brand for Volvo Penta replacement starters? Sierra manufactures the 18-5906 as a purpose-built replacement for Volvo Penta 4 cylinder engines, matching the fit and output of the original 840808-0 starter.