Sierra Distributor Rotor SIE-18-5403

Sierra SIE-18-5403 is a marine distributor rotor identified as AP-873 for Prestolite distributor applications with screw-down caps. Current listings consistently describe it for Prestolite V6 and V8 marine ignition systems, including selected MerCruiser, OMC, Volvo Penta, Crusader, Pleasurecraft, and Chrysler applications.

Key Features

• Distributor rotor
• Sierra part number: 18-5403
• AP-873 application reference
• For Prestolite V6 and V8 distributors with screw-down caps
• Commonly listed for Prestolite 7013 applications
• Marine ignition tune-up replacement part.

Engine Compatibility
Common listings tie Sierra 18-5403 to Ford and GM 6- and 8-cylinder marine engines using Prestolite conventional ignition with screw-down cap distributors. Public cross-reference sources also connect it to selected MerCruiser stern drive, OMC stern drive, Volvo Penta, Crusader, Pleasurecraft, and Chrysler marine applications. Because rotor fitment is distributor-specific, fitment should be confirmed by engine model, distributor type, and cap style before ordering.

Serial Number Fitment Notice
Fitment should be confirmed by engine model, serial number, and installed distributor type before ordering. The safest match is by the original rotor number and Prestolite screw-down cap setup, not by engine family alone.

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

Installation Notes
Install only on the correct Prestolite screw-down cap distributor application. Confirm the replacement matches the removed rotor exactly before installation, and inspect the distributor cap at the same time. This part is easy to confuse with other Prestolite and Mallory marine rotors, so distributor match is more important than appearance alone.

Alternate / Superseded Part Numbers

• AP-873
• 18-5403
• Mercury MerCruiser 392-9089
• Mercury MerCruiser 392-9089T
• Mercury MerCruiser 392-9767
• OMC 982880
• Volvo Penta 855845
• Volvo Penta 855845-4
• Volvo Penta 841907
• Volvo Penta 3853801
• Pleasurecraft R103004
• Crusader 41074
• Crusader 41089
• Mallory 9-29203
• Mallory 9-29214
• GLM 71060
• GLM 71130.

Parts Desk Insight
The key match point on SIE-18-5403 is the distributor family and cap-retention style. Current sources consistently place it on Prestolite screw-down cap systems, which is the fastest way to separate it from similar marine rotors used on clip-down or Delco module-in-cap distributor setups.

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