Sierra Ignition Rotor SIE-18-5425

Sierra SIE-18-5425 is an ignition rotor for selected Volvo Penta marine distributor applications. Current aftermarket listings consistently identify it as a Prestolite-style rotor and an interchange for Volvo Penta 834975 and 834975-5.

Key Features

• Ignition rotor
• Sierra part number: 18-5425
• Prestolite-style rotor
• Common interchange for Volvo Penta 834975 and 834975-5
• Common aftermarket interchange also includes GLM 71050.

Engine Compatibility
Common listings tie Sierra 18-5425 to selected Volvo Penta stern drive and marine gasoline applications using the matching Prestolite distributor setup. One fitment listing specifically shows Volvo Penta 8-cylinder applications including AQ200C, AQ225C, AQ255A, AQ190, AQ240, AQ255B, AQ280A, AQ260B, AQ200D, AQ225D, AQ260A, AQ290A, AQ260, BB225, and BB260 with Prestolite distributor IBM-7011B. Fitment should still be confirmed by engine model, distributor type, and original rotor number before ordering.

Serial Number Fitment Notice
Fitment should be confirmed by engine model, serial number, and installed distributor type before ordering. Rotor fitment is distributor-specific, so matching the original Volvo Penta number and distributor style is safer than matching by engine family alone.

When This Part Needs Replacement
Replace when the rotor shows burning, carbon tracking, corrosion, cracking, looseness, or visible tip wear, or when distributor service reveals inconsistent spark transfer. Rotor condition directly affects ignition performance and spark delivery.

Installation Notes
Install only on the correct Prestolite distributor application. Confirm the replacement matches the removed rotor exactly before installation, and inspect the distributor cap at the same time. This rotor is commonly sold as a direct replacement for Volvo Penta 834975 / 834975-5, so matching the original part number is the safest approach.

Alternate / Superseded Part Numbers

• 18-5425
• Volvo Penta 834975
• Volvo Penta 834975-5
• GLM 71050
• Crusader 834975
• Quicksilver 803322

Parts Desk Insight
This rotor is best matched by distributor type first. Sierra 18-5425 is consistently described as a Prestolite rotor, which is the key detail that separates it from similar Volvo Penta rotor listings that look close but fit different distributor families.

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