Sears 4-Stroke 6-15HP Marine Engine Parts

(2 products)

This page supports Sears 4‑Stroke 6–15 HP outboard engines and helps you find compatible parts and service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. Many Sears‑badged small outboards in this range were manufactured by Mercury, so cross‑referencing Mercury small‑horsepower components is common. You can also browse the main Mercury outboard collection. Scroll to the bottom of the page to start browsing parts for this engine, and remember that on the collection page you can use the Filter & Sort controls to narrow results by horsepower, year range, and part category/section.

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How to Identify Your 6–15 HP Model

Locate the serial/model plate on the transom bracket or swivel bracket; it typically lists brand (Sears/Gamefisher badge), horsepower, and a serial/model code.
Decode suffixes for shaft length and controls (e.g., S = short shaft, L = long shaft; rope vs. electric start). These details affect propellers, shift/tilt parts, and wiring.
Confirm 4‑stroke features: an engine oil fill/dipstick and oil filter indicate a 4‑stroke; maintenance requirements differ from 2‑stroke models.
For Sears‑badged units built by Mercury, match parts by the Mercury small 4‑stroke family (6/8/9.9/15 HP) using the serial range to ensure correct gaskets, pumps, and ignition items.

Platform Overview

6–8 HP 4‑Stroke Platform

Feature	Description
Configuration	Small 4‑stroke outboard, typically single‑ or twin‑cylinder, carbureted; manual or electric start variants.
Common Models	Sears‑badged 6–8 HP models built on the Mercury small‑horsepower platform.
Advantages	Lightweight, quiet operation, excellent trolling economy, simple service access.
Notes	Many cooling and ignition service parts interchange with 9.9/15 HP of the same family; confirm by serial.

9.9–15 HP 4‑Stroke Platform

Feature	Description
Configuration	Inline‑2 4‑stroke, carbureted; manual or electric start; tiller or remote options depending on variant.
Common Models	Sears‑badged 9.9/15 HP models corresponding to Mercury small 4‑stroke families.
Advantages	Strong low‑end torque for small boats, good fuel economy, widely available service parts.
Notes	Water pump, anodes, and many tune‑up items are shared across 6/8/9.9/15 HP families; verify by serial plate and shaft length.

Routine Maintenance & Service Parts

Intervals below are general guidelines for small 4‑stroke outboards. Always follow your specific service manual and serial‑range procedures.

Item	Interval*	Remarks	Parts Link
Engine oil & filter	100 hours or annually	Use marine 4‑stroke FC‑W oil; replace filter at each oil change.	Oil Filters
Gear oil (lower unit)	100 hours or annually	Inspect for water (milky oil); replace seals if contamination is found.	Mercury Outboard Parts
Spark plugs	Inspect 100 hours; replace 200 hours or as needed	Gap to spec; replace if fouled or worn.	Spark Plugs
Fuel filter / water separator	100 hours or seasonally	Replace more often with ethanol fuel or storage issues.	Fuel Filters
Water pump impeller or kit	Every 2–3 seasons (200–300 hours) or sooner if weak tell‑tale	Critical for cooling; inspect annually if used in sandy/silty water.	Mercury Water Pump Kits
Anodes (sacrificial)	Inspect every 50–100 hours; replace when ~50% eroded	Choose anode material for your water (zinc, aluminum, or magnesium).	Anodes

Frequently Used Parts Categories

Routine Service: Service & Maintenance Kits
Cooling System: Mercury Water Pump Repair Kits
Fuel System: Fuel Filters and Fuel Pumps
Ignition / Electrical: Electrical Items and Spark Plugs
Gearcase & Seals: Mercury Lower Unit Seal Kits
Propulsion & Protection: Propellers and Propeller Guards
General Mercury Coverage: Mercury Outboard Parts

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screen, thermostat, and impeller housing for wear/debris.	Water pump kit, thermostat, intake screen
Hard starting or rough idle	Verify fresh fuel, primer bulb firmness, choke/fast‑idle operation, and spark plug condition.	Spark plugs, fuel filter, carburetor cleaning kit
Poor acceleration or power loss	Check prop pitch/damage, fuel restriction, and ignition performance.	Propeller, fuel filter, fuel pump, ignition components
Gearcase noise or milky gear oil	Drain gear oil; inspect for water intrusion and seal damage.	Lower unit seal kit, gear lube, drain/vent screw gaskets

FAQs

Are parts interchangeable across 6/8/9.9/15 HP models?

Many wear items (water pump, anodes, and select ignition/fuel parts) interchange across the small 4‑stroke family. Always confirm by serial/model and shaft length before ordering.

When should I replace the impeller?

Replace every 2–3 seasons (or 200–300 hours). Inspect annually if you run in sandy or silty water, or whenever the tell‑tale weakens.

How often should I change gear oil?

Every 100 hours or annually. If you see milky oil, replace seals before returning to service.

What info do you need to confirm compatibility?

Provide the serial/model number from the bracket plate, shaft length (S/L), start type (manual/electric), and any known Mercury cross‑reference. Photos of the nameplate and the part to replace help ensure an exact match.

Ready to find parts by horsepower, year, and model? Browse our Mercury outboard collection for the Sears‑compatible small 4‑stroke families.

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If you’re unsure about your model, send us a photo of the nameplate and the part you need and we’ll help verify compatibility.