Mercury Mercruiser Marine Engine Parts

(358 products)

This page helps Mercury and MerCruiser marine engine owners find compatible parts and service information. Inside you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Mercury and MerCruiser collections, and when you open a collection use the Filter & Sort controls to narrow results by horsepower, year range, and part category. Scroll to the bottom of this page to start browsing parts for your engine.

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How to Identify Your Model

Find the serial/nameplate: Mercury outboards typically have a sticker on the transom bracket (starboard side). MerCruiser packages use two serials — one on the engine and one on the drive (Alpha/Bravo).
Model code and suffix: Outboards often include suffixes for shaft length (S/L/XL) and control type (tiller vs. remote). Sterndrives use separate engine and drive model identifiers.
2‑Stroke vs 4‑Stroke outboards: 2‑Strokes are carbureted or oil‑injected and require premix/oil injection service; 4‑Strokes have an engine oil filter and usually EFI.
Record key details before ordering: serial number(s), shaft length, control type, and approximate model year to confirm parts compatibility.

Platform Overview

Mercury Outboards (2‑Stroke and 4‑Stroke families)

Feature	Description
Configuration	Inline 2–4 cylinder 2‑Stroke carb/oil‑injected (legacy) and Inline 3–4 cylinder 4‑Stroke EFI (modern)
Common Models	Typical 40–150 HP families across multiple year ranges; serial number confirms exact sub‑model
Advantages	2‑Stroke: light weight and strong hole‑shot; 4‑Stroke: fuel efficiency, low noise, and clean idle
Notes	Many service items (impellers, filters, plugs) are model‑specific; always verify with the serial plate.

MerCruiser Sterndrive (Gasoline V6/V8 packages)

Feature	Description
Configuration	V6/V8 gasoline, carb or EFI/MPI with Alpha or Bravo drives
Common Models	Popular MPI packages and classic carb models; drive type (Alpha/Bravo) is critical for parts
Advantages	Strong torque for planing and cruising; broad parts availability
Notes	Always capture both engine and drive serial numbers to select correct gimbal, pump, and gearcase parts.

Routine Maintenance & Service Parts

Intervals below are general guidelines; always follow the official service manual for your exact serial range and usage conditions.

Item	Interval*	Remarks	Parts Link
Engine oil + filter (4‑Stroke only)	First 20 hours, then every 100 hours or annually	Use FC‑W marine oil; warm engine before draining; replace crush washer if applicable	Oil Filters
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water/milkiness and metal on magnetic plug; replace seals if intrusion is found	Mercury Lower Unit Seal Kits
Spark plugs	Inspect every 100 hours; replace 200–300 hours or as needed	Check gap and color; replace if fouled, worn, or out of spec	Spark Plugs
Fuel filter / water separator	Every 100 hours or annually; sooner with poor fuel	Drain and check for water; replace cartridge or in‑line filter per model	Fuel Filters
Water pump impeller / kit	Every 2–3 seasons or 200 hours; annually in sandy/silty water	Replace full kit if housing is worn or scored; verify telltale flow after service	Mercury Water Pump Repair Kits
Anodes (sacrificial)	Inspect every 50 hours; replace when 50% consumed	Match alloy to water type (salt, brackish, fresh); ensure good electrical contact	Anodes
2‑Stroke oiling system (if equipped)	Annually	Verify injection pump calibration, filters, and check valves; inspect hoses for brittleness	Mercury Outboard Parts

Frequently Used Parts Categories

Routine Service — Service & Maintenance Kits
Cooling System — Mercury Water Pump Repair Kits
Gearcase & Seals — Mercury Lower Unit Seal Kits
Fuel System — Fuel Filters
Ignition / Electrical — Electrical Items
Corrosion Protection — Anodes
Propulsion — Propellers

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale stream / overheat alarm	Clear the telltale, inspect intake screens, verify impeller age and thermostat operation	Water pump kit, intake screen, thermostat, gaskets
Poor acceleration / power loss	Check prop for damage/cavitation, replace fuel filter, inspect plugs and compression	Propeller, fuel filter, spark plugs, fuel pump
Hard starting / rough idle	Prime fuel system, confirm clean fuel, test spark, check IAC (4‑Stroke) or carb settings (2‑Stroke)	Spark plugs, fuel filter, hoses, carb kits / IAC valve
Excessive smoke (2‑Stroke)	Verify premix ratio or oil injection settings; look for stuck check valves	Oil injection components, fuel lines, reeds, thermostat
Gearcase noise / metal in oil	Check oil level/condition; pressure test for seal failure; inspect prop shaft for fishing line	Lower unit seal kit, gear oil, bearings

FAQs

Are parts interchangeable between different years or platforms?

Some service items may cross between years, but many parts are specific to the serial range and platform (2‑Stroke vs 4‑Stroke outboards; Alpha vs Bravo drives). Always confirm with your serial(s) before ordering.

When should I replace the impeller?

Typically every 2–3 seasons or 200 hours, and annually if you run in sandy/silty water or notice a weak telltale. Replace the full kit when the cup or wear plate is scored.

How often should gear oil be changed?

Every 100 hours or annually. Inspect for water (milky color) or metal debris on the magnetic plug; address seal or bearing issues promptly if contamination is found.

What information helps confirm part compatibility?

Provide the engine and (if sterndrive) drive serial numbers, approximate model year, shaft length, control type, and clear photos of the nameplate and the part you need.

Ready to find the right components? Browse the main Mercury collection by horsepower, year, and model, then use Filter & Sort to narrow your results.

Shop Mercury Outboard Parts

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.