Sierra 18-5172 Marine Ignition Coil, Replaces OMC 581786 - Johnson/Evinrude Outboard Motor

The Sierra 18-5172 is a marine ignition coil built for Johnson and Evinrude outboard motors. It is manufactured to meet or exceed original equipment quality, giving boat owners a reliable way to restore spark output on an outboard with a failed or weakening coil. The coil cross-references directly to Evinrude/Johnson OEM numbers 0581786, 0581370, and 0502881, as well as OMC 581786, GLM 72030, and Mallory 9-23106, so it can be ordered as a straightforward, drop-in replacement for the original part using any of those reference numbers.

The coil has a compact body measuring 0.39 x 0.39 x 0.39 inches and uses a screw-in or bolt-on installation type, consistent with typical outboard ignition coil mounting. It weighs 0.59 pounds and is sold as a single unit. This part is intended as a fit-specific replacement, so buyers should confirm the cross-reference or OEM number against their existing coil before ordering.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5172
• Product Type: Ignition Coil
• Compatible Engine Brands: Johnson/Evinrude Outboard Motor
• Installation Type: Screw-In or Bolt-On
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 0.59 pounds
• UPC: 030999318435
• OEM Cross Reference: GLM 72030, Evinrude/Johnson 0581786, 0581370, 0502881, Mallory 9-23106, OMC 581786

Fitment

Fits Johnson/Evinrude outboard motors that use the OEM coil numbers listed below; confirm against your motor's existing coil number before ordering.

Replaces (OEM)

• GLM 72030
• Evinrude/Johnson 0581786
• Evinrude/Johnson 0581370
• Evinrude/Johnson 0502881
• Mallory 9-23106
• OMC 581786

Frequently Asked Questions

What motors does the Sierra 18-5172 ignition coil fit? The Sierra 18-5172 is built for Johnson/Evinrude outboard motors. It is a fit-specific part, so confirm the OEM coil number on your motor matches one of the cross-references before ordering.

Is GLM 72030 the same part as Sierra 18-5172? Yes, GLM number 72030 cross-references directly to Sierra 18-5172, so either number identifies the same ignition coil.

What OEM part numbers does the 18-5172 coil replace? It interchanges with Evinrude/Johnson 0581786, 0581370, and 0502881, OMC 581786, Mallory 9-23106, and GLM 72030.

What are the dimensions of the Sierra 18-5172 ignition coil? The coil measures 0.39 x 0.39 x 0.39 inches.

How much does the Sierra 18-5172 ignition coil weigh? It weighs 0.59 pounds.

Is the 18-5172 a genuine Sierra part or a generic aftermarket coil? It is a Sierra branded ignition coil manufactured to meet or exceed original equipment quality, not a generic unbranded part.

How is the 18-5172 ignition coil installed? It uses a screw-in or bolt-on installation type, matching the mounting style of the original Johnson/Evinrude coil it replaces.

What comes in the box with the Sierra 18-5172? The listing includes one Sierra 18-5172 marine ignition coil, sold as a single unit.

What is the UPC for the Sierra 18-5172 ignition coil? The UPC is 030999318435.

Is Mallory 9-23106 interchangeable with the Sierra 18-5172? Yes, Mallory 9-23106 is listed as an interchangeable number for the Sierra 18-5172 ignition coil.

How does the Sierra 18-5172 compare to the original OMC 581786 coil? The Sierra 18-5172 cross-references directly to OMC 581786 and is manufactured to meet or exceed original equipment quality, making it a direct functional replacement.

Does the Sierra 18-5172 ignition coil have a warranty? Yes, the Sierra 18-5172 is backed by a limited warranty.