Sierra NEW Ignition Coil 18-5186 Replaces: Mercury 339-7370A13 6-150HP NOS 0810

Sierra Ignition Coil — Part Number 18-5186
Brand: Sierra | Condition: New Old Stock (NOS)

You are purchasing a new Sierra Ignition Coil, part number 18-5186, for Mercury/Mariner and Chrysler/Force outboard motors. This is a genuine Sierra branded part — never installed, never used.

Installation Note: Use of RTV silicone is recommended when installing this coil. See Permatex Ultra Black Maximum Oil Resistance RTV Silicone or equivalent.

Condition Details:

This is a New Old Stock (NOS) part. The ignition coil itself is in new, uninstalled condition. As is common with NOS inventory, the original packaging may show signs of age, including shelf wear, dust, or minor cosmetic blemishes on the bag or box. The part is new and fully functional.

Part Number / Supersede Information:

Primary Part Number: 18-5186
Replaces OEM Mercury: 339-7370A13, 339-7370B13, 339-832757B4, 339-832757A4, 339-832757A3, 339-7370A2, 339-7370A6, 339-7370A8, 339-7370A16, 339-7370A19, 339-7370A23, 338-4774A1, 338-4995A1, 338-4995A2

Fitment:

Mercury / Mariner outboards across a wide range including:

• 6, 8, 9.9HP — S/N A197112 & Up | 15HP — S/N B292414 & Up | 18HP — S/N 5705532–B238463
• 20, 25HP — S/N 5705532–G760299 | 35HP — S/N 6445653 & Up
• 40HP 2-cyl — S/N 3859435–5823917 | 40, 45, 50HP 4-cyl — S/N 5531630 & Up
• 50, 55, 60HP 3-cyl | 70, 75HP 3 & 4-cyl | 80, 90HP 3, 4 & 6-cyl
• 100, 115, 125, 140HP 4-cyl | V135, V150 | 210CC Sail Power
• Chrysler / Force 40, 50HP (1992–1995) | 70, 90HP (1991–1995) | 120HP (1990–1995) | Sport Jet 120HP (1994–1995) | 150HP (1989–1994)
• Please verify fitment using your motor's model and serial number before ordering

Why Choose Quality Replacement Parts?

Sierra parts are engineered to meet or exceed OEM specifications, providing reliable performance and a precise fit for your Mercury, Mariner, or Chrysler/Force outboard. Every Sierra part is purpose-built for harsh marine environments and backed by Sierra's limited lifetime warranty covering defects in workmanship and materials.

Returns:

We proudly offer hassle-free returns. If you are not completely satisfied with your purchase for any reason, simply open a return request through eBay within 30 days of purchase and we will take care of you promptly.

Thank you for choosing QBS Parts Inc! We truly appreciate your business. If you have any issues whatsoever with your order, please give us the opportunity to resolve it before leaving feedback — we are committed to making every transaction a great experience. Please verify fitment using your motor's model and serial number before purchasing. Feel free to message us with any questions — we're here to help!

QBS Parts, Inc. — Gardena, CA