Sierra 18-6437

Keep your outboard engine firing up smoothly every time with the Sierra 18-6437 starter. Designed as a direct-fit replacement for popular Johnson and Evinrude models, this robust starter motor tackles the harsh marine environment head-on, ensuring reliable starts even after long days on the water. Boat owners swear by Sierra parts for their no-fuss performance and longevity, making this a smart choice for maintenance pros and weekend warriors alike.

Why the Sierra 18-6437 Stands Out

Crafted with marine-grade materials, the 18-6437 resists corrosion from saltwater exposure and vibration from rough seas. Its high-torque design delivers quick cranking power for 3- and 4-cylinder engines, reducing wear on your battery and flywheel. Unlike flimsy generics, this starter features sealed windings and heavy-duty brushes for extended life—often outlasting OEM units in real-world testing by mechanics.

• Direct OEM Replacement: Matches factory specs for seamless bolt-on installation.
• Corrosion-Resistant Housing: Zinc plating and epoxy coatings fight rust in brackish or saltwater.
• High-Performance Solenoid: Engages reliably under load, even with weak batteries.
• Compact and Lightweight: Easier handling during DIY swaps without sacrificing power.

Perfect Fit for Your Engine

The Sierra 18-6437 slots right into a range of Johnson/Evinrude outboards, including 40HP to 115HP 2-stroke models from the late '80s through early 2000s. Common applications include:

• Johnson 88, 90, 100, 115HP (3-cyl)
• Evinrude 70, 80, 90HP equivalents
• OMC inline 4-cylinder variants

Pro Tip: Cross-check your engine's serial number against Sierra's compatibility charts or consult your service manual for exact matches—peace of mind before purchase.

Boost Reliability with Smart Installation

Swapping starters is a straightforward job that saves big on shop labor. Here's a mechanic-approved walkthrough:

1. Disconnect the battery negative cable first—safety first.
2. Remove the cowling and unbolt the old starter (usually 2-3 bolts).
3. Detach wiring harness and solenoid leads carefully.
4. Bolt on the Sierra 18-6437, reconnect wires, and torque to spec (around 15-20 ft-lbs).
5. Test crank before full reassembly.

Expect 30-60 minutes for most DIYers. Freshen up connections with dielectric grease to prevent future corrosion.

Spotting Starter Troubles Early

Don't wait for a dead engine on the water. Watch for clicking noises, slow cranking, or grinding—hallmarks of a failing starter. The 18-6437 fixes these by restoring full amperage draw and pinion engagement. Pair it with a battery load test for total system health, and you'll minimize downtime next season.

Frequently Asked Questions

Equip your boat with the Sierra 18-6437 and get back to reliable adventures on the water. Solid starts mean more time fishing, cruising, or exploring.