Sierra 18-5158 Ignition Coil for Mercury 125 DFI 3 Cylinder & V-135 DFI 2.5L Outboard Motors

The Sierra 18-5158 is an ignition coil engineered for compatible Mercury outboard motors, built to meet or exceed original equipment manufacturer standards. The coil uses a high-quality brass secondary post for superior corrosion protection in demanding marine environments, along with a quality heatsink design that promotes efficient heat dissipation for consistent spark performance. Inside, a moisture-proof, molded distributor insulator body helps resist water intrusion, and a high-quality conductive center carrier maintains reliable electrical contact for dependable ignition timing.

The 18-5158 is compact, measuring 0.39 x 0.39 x 0.39 inches and weighing 0.9 pounds, and connects using a male connector for straightforward installation. It is a single-unit ignition coil intended as a direct replacement for the specific Mercury outboard applications it covers.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5158
• Product Type: Ignition Coil
• Connector Gender: Male
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 0.9 pounds
• UPC: 808282373832
• Unit Count: 1

Fitment

• Mercury 125 DFI (3 Cylinder), serial number 1B736885 and up
• Mercury V-135 DFI 2.5L, serial number 1B417702 and up

Replaces (OEM)

No OEM cross-reference numbers are specified for this part.

Frequently Asked Questions

What is the Sierra 18-5158 ignition coil used for? It is an ignition coil for compatible Mercury outboard motors, designed to meet or exceed OEM standards for spark performance and reliability.

Which Mercury outboard motors does the 18-5158 ignition coil fit? The 18-5158 fits Mercury 125 DFI (3 Cylinder) outboards from serial number 1B736885 and up, as well as Mercury V-135 DFI 2.5L outboards from serial number 1B417702 and up.

Does the 18-5158 fit Mercury 125 DFI 3 cylinder motors? Yes, the Sierra 18-5158 fits Mercury 125 DFI (3 Cylinder) outboard motors with serial number 1B736885 and up.

Does the 18-5158 fit Mercury V-135 DFI 2.5L motors? Yes, the 18-5158 fits Mercury V-135 DFI 2.5L outboard motors with serial number 1B417702 and up.

What serial number is required for the 125 DFI 3 Cylinder fitment? For the Mercury 125 DFI (3 Cylinder) application, the 18-5158 ignition coil fits motors with serial number 1B736885 and up.

Is the Sierra 18-5158 built to OEM standards? Yes, the 18-5158 ignition coil meets or exceeds OEM standards, with a brass secondary post and heatsink design for reliable performance.

What connector type does the 18-5158 use? The Sierra 18-5158 ignition coil has a male connector.

What are the dimensions and weight of the 18-5158 ignition coil? The 18-5158 measures 0.39 x 0.39 x 0.39 inches and weighs 0.9 pounds.

What is the secondary post made of on the 18-5158? The 18-5158 ignition coil uses a high-quality brass secondary post for superior corrosion protection.

How many ignition coils come in the package? The Sierra 18-5158 is sold as a single ignition coil, unit count of 1.

Does the 18-5158 ignition coil include a warranty? Yes, the Sierra 18-5158 ignition coil is covered by a limited warranty.

What is the UPC for the Sierra 18-5158 ignition coil? The UPC for the Sierra 18-5158 ignition coil is 808282373832.