Sierra 18-8813-1 Spark Plug Wire Set, Replaces Volvo Penta 875571, for AQ120B/AQ125/AQ131/AQ140/AQ145/AQ151 4-Cylinder Engines

The Sierra 18-8813-1 is a MagForce premium marine spark plug wire set built for 4-cylinder Volvo Penta stern drive engines. Each wire uses a Kevlar core paired with a durable stainless steel wound conductor, giving the set the strength to handle continuous marine vibration and heat cycling while supporting reliable spark delivery for maximum horsepower and engine performance. The wires are covered in premium silicone jacketing with silicone boots, providing high temperature protection at the spark plug and distributor connections where heat exposure is greatest. Superior RFI suppression is built into the construction, reducing ignition-generated interference so that sensitive onboard electronics and marine electronics are not disrupted during operation.

Corrosion resistant stainless steel is used at both the spark plug and distributor terminals, maintaining strong electrical conductivity even in a saltwater and high-humidity marine environment. The set is sized with a 7 millimeter wire diameter and is designed for conventional ignition systems on 4-cylinder engines. The 18-8813-1 is a direct fit for a range of Volvo Penta AQ-series stern drive engines, replacing the original Volvo Penta ignition wiring while adding upgraded materials over typical wear-prone factory wiring. It ships as a complete one-set unit ready to install on a compatible 4-cylinder Volvo Penta engine.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8813-1
• Product Type: Spark Plug Wire Set
• Number of Cylinders: 4
• Ignition Type: Conventional
• Wire Diameter: 7 millimeters
• Core Material: Kevlar
• Conductor: Stainless steel wound conductor
• Jacket and Boot Material: Silicone
• Terminal Material: Corrosion resistant stainless steel
• Connector Type: Spark plug terminals and ignition system connector
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 0.93 pounds
• UPC: 808282194413

Fitment

• Volvo Penta AQ120B, 4-cylinder, 1977 to 1980
• Volvo Penta AQ125A/B, 4-cylinder, 1981 to 1985
• Volvo Penta AQ131A/B/C/D, 4-cylinder, 1985 to 1989
• Volvo Penta AQ140A, 4-cylinder, 1975 to 1979
• Volvo Penta AQ145A/B, 4-cylinder, 1979 to 1985
• Volvo Penta AQ151A/B/C, 4-cylinder, 1985 to 1989

Replaces (OEM)

• Volvo Penta 875571
• Volvo Penta 875571-2

Frequently Asked Questions

What Volvo Penta engines does the Sierra 18-8813-1 spark plug wire set fit? The 18-8813-1 fits Volvo Penta AQ120B (1977 to 1980), AQ125A/B (1981 to 1985), AQ131A/B/C/D (1985 to 1989), AQ140A (1975 to 1979), AQ145A/B (1979 to 1985), and AQ151A/B/C (1985 to 1989), all 4-cylinder engines.

Does this wire set replace Volvo Penta 875571? Yes, the Sierra 18-8813-1 replaces Volvo Penta 875571, as well as OEM number 875571-2.

What is the wire diameter on this set? 7 millimeters, matched to the conventional ignition systems used on the compatible 4-cylinder Volvo Penta engines.

What materials is the 18-8813-1 wire set made from? It combines a Kevlar core with a stainless steel wound conductor, covered by premium silicone jacketing and silicone boots.

Why does it use stainless steel terminals? Corrosion resistant stainless steel spark plug and distributor terminals keep the 18-8813-1 conductive in a marine environment where standard terminals would corrode.

Does the wire set reduce electronic interference? Yes, the 18-8813-1 includes RFI suppression to protect sensitive onboard electronics from ignition interference.

How many cylinders is this wire set designed for? This is a 4-cylinder wire set, matching the AQ120B, AQ125, AQ131, AQ140, AQ145, and AQ151 Volvo Penta engines.

What ignition type is the 18-8813-1 compatible with? Conventional ignition systems.

How much does the Sierra 18-8813-1 weigh? 0.93 pounds.

Is the 18-8813-1 a genuine Volvo Penta part or aftermarket? It is a Sierra-branded MagForce wire set engineered as a replacement for Volvo Penta 875571 and 875571-2, not an original Volvo Penta part.

What are the dimensions of the wire set components? Each component of the 18-8813-1 measures 0.39 x 0.39 x 0.39 inches.

What is included when ordering the 18-8813-1? One complete spark plug wire set for a 4-cylinder Volvo Penta engine.