Sierra 18-5305 Contact Set, Replaces Volvo Penta 243799 1306169 243460, Bosch 4-Cylinder I/O Ignition

The Sierra 18-5305 is a contact set (ignition points) built for Bosch 4-cylinder I/O ignition systems used on Volvo Penta stern drives. It is a precision-machined replacement component designed to meet or exceed the quality of the original equipment part it replaces, restoring proper point gap and dwell for reliable spark timing. This contact set is one of the individual components in Sierra's Volvo Penta tune-up kit lineup, alongside the matching 18-5349 condenser and 18-5428 rotor, and is sold here as a standalone part for owners replacing just the points.

Contact sets are a wear item in traditional breaker-point ignition systems, and swapping in a fresh set at regular intervals helps prevent hard starting, misfires, and rough idle caused by pitted or worn contacts. The Sierra 18-5305 is manufactured to original dimensions and mounting geometry so it installs the same way as the OEM part it replaces, with no modification required.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5305
• Product Type: Contact Set (Ignition Points)
• Compatible Ignition System: Bosch 4-cylinder I/O - Volvo Penta
• OEM Cross Reference: 243799, 1306169, 243460
• Weight: 0.05 pounds
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• Exterior Finish: Machined
• UPC: 030999318725

Fitment

• Volvo Penta stern drive (I/O) applications using a Bosch 4-cylinder ignition system

Replaces (OEM)

• 243799
• 1306169
• 243460

Frequently Asked Questions

What does the Sierra 18-5305 fit? The Sierra 18-5305 contact set is designed for Bosch 4-cylinder I/O ignition systems used on Volvo Penta stern drives.

What OEM part numbers does the 18-5305 replace? It replaces Volvo Penta part numbers 243799, 1306169, and 243460.

Is the 18-5305 a genuine Volvo Penta part? No, it is a Sierra-manufactured aftermarket contact set engineered to meet or exceed the quality of the original Volvo Penta ignition points it replaces.

What is included with part number 18-5305? This listing is for the contact set (ignition points) only; it does not include the matching Sierra 18-5349 condenser or 18-5428 rotor, which are sold separately.

How much does the Sierra 18-5305 weigh? The Sierra 18-5305 contact set weighs 0.05 pounds.

What are the dimensions of the 18-5305 contact set? It measures 0.39 x 0.39 x 0.39 inches.

Will the 18-5305 work with a different ignition system? The 18-5305 contact set is built specifically for Bosch 4-cylinder I/O ignition systems on Volvo Penta stern drives; check your engine's ignition system before ordering to ensure proper fit.

Why would I replace the contact set in a breaker-point ignition system? Contact sets wear and pit over time, which can cause hard starting, misfiring, and rough idle; installing a fresh Sierra 18-5305 restores correct point gap and dwell for reliable spark timing.

Does the 18-5305 require modification to install? No, the Sierra 18-5305 is manufactured to original dimensions and mounting geometry so it installs the same way as the OEM contact set it replaces.

What finish does the Sierra 18-5305 have? The 18-5305 contact set has a machined exterior finish.

Is the Sierra 18-5305 part of a larger tune-up kit? Yes, the 18-5305 contact set pairs with the Sierra 18-5349 condenser and 18-5428 rotor as part of a Volvo Penta ignition tune-up, though each is sold under its own part number.