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MerCruiser 4-Stroke 260HP Marine Engine Parts

(23 products)

This page is for MerCruiser 4‑Stroke 260HP marine sterndrive engines. It helps you find compatible parts and service information, with maintenance tips, common replacement items, and troubleshooting guidance. You can also browse the main MerCruiser collection. Scroll to the bottom of this page to start browsing parts for this engine, and on the collection page use the Filter & Sort controls to narrow results by horsepower, year range, and part category.

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How to Identify Your 260HP Model

  • Find the serial plate: typically on the flame arrestor cover, valve cover, or starboard side of the engine; the sterndrive/gearcase serial is on the transom assembly or drive housing (Alpha or Bravo).
  • Record engine serial and drive serial: MerCruiser parts lookups are serial‑driven. The serial identifies model year range, ignition/fuel system (carb vs. EFI/TBI), and drive family.
  • Check fuel/ignition type: 260HP 5.7L packages were commonly carbureted on earlier models and TBI/EFI on later; ignition may be Thunderbolt IV/V or equivalent electronic distributor.
  • Confirm drive family: Alpha One vs. Bravo drives use different anode kits, water pump configurations, and gearcase seals.

Engine/Platform Overview

5.7L V8 260HP — Carbureted Packages

Feature Description
Configuration 5.7L (350 cu in) V8 gasoline, 4‑Stroke, carbureted, raw‑water or closed‑cooling variants.
Common Models 260HP packages paired with Alpha One Gen I/Gen II or Bravo One drives; Thunderbolt IV/V ignition common.
Advantages Simple fuel system, strong low‑to‑mid torque, wide parts availability.
Notes Alpha drives use an impeller in the drive; many Bravo installs use a crank‑driven seawater pump. Anode kits vary by drive family.

5.7L V8 260HP — TBI/EFI Packages

Feature Description
Configuration 5.7L V8 gasoline, 4‑Stroke, throttle‑body or multi‑port fuel injection, electronic ignition.
Common Models 260HP EFI/TBI with Alpha or Bravo drives; variations in ECM, sensor sets, and fuel delivery components.
Advantages Improved cold starts, smoother idle, better fuel economy than carb variants.
Notes Fuel system parts (filters, pumps, injectors) and sensors depend on the exact serial range and ECM; verify by serial number.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical use. Always follow the official MerCruiser service manual and your boat builder’s recommendations.

Item Interval* Remarks Parts Link
Engine oil & filter Every 100 hours or annually Use marine‑rated FC‑W oil; change at end of season if hours are low. MerCruiser Service & Maintenance Kits
Gear oil (drive) Every 100 hours or annually Inspect magnet and oil for metal; pressure test if contamination is found. Lower Unit Seal Kits
Spark plugs Every 300 hours or 3 years Check gap and condition; replace sooner if fouled or misfiring. Spark Plug
Fuel filter / water separator Inspect each 50 hours; replace annually Drain water regularly; replace element to protect carb/EFI components. MerCruiser Fuel Filters
Seawater pump impeller Every 2–3 seasons (inspect annually) Alpha: impeller in drive. Many Bravo: crank‑driven pump on engine. Replace sooner in sandy/silty water. MerCruiser Impellers
Anodes (zinc/aluminum/magnesium) Inspect monthly in season; replace at ~50% wear Match material to water type (salt/brackish/fresh). Alpha vs. Bravo kits differ. MerCruiser Anodes

Frequently Used Parts Categories

Common Symptoms & Quick Checks

Symptom Check First Related Parts
Overheat alarm / high temperature Inspect seawater pump impeller, intake screens, hoses, and thermostat; verify belt condition on crank‑driven pumps. Water pump impeller kit, thermostat, intake screen/strainer, belts, hose clamps
Poor acceleration / power loss Check fuel quality, water separator, anti‑siphon valve, spark plugs, and timing/ignition; confirm prop pitch/load. Fuel filter/water separator, fuel pump, spark plugs, ignition components, propeller
Hard starting / rough idle Verify battery voltage and grounds; inspect IAC/idle air (EFI) or carb settings; look for vacuum leaks. Fuel filters, fuel pump, ignition parts, gaskets/hoses, starter/battery cables
Gearcase noise / metal in gear oil Drain and inspect oil; check prop shaft for fishing line; pressure/vacuum test seals; ensure correct oil level. Lower unit seal kit, bearings, gear lube, prop shaft hardware
Battery not charging Inspect belt tension, alternator output, connections, and main grounds. Alternator, belt, electrical connectors

FAQs

Are parts interchangeable between different years or between Alpha and Bravo packages?

Some service items cross over, but many parts differ by serial number, fuel/ignition type, and drive family. Anodes, water pump components, and gearcase seals in particular vary between Alpha and Bravo. Always confirm by engine and drive serial.

When should I replace the seawater pump impeller?

Inspect annually and replace every 2–3 seasons under normal use. In sandy or silty water, or if signs of overheat/low flow appear, replace sooner. Alpha drives have the impeller in the drive; many Bravo packages use a crank‑driven pump on the engine.

How often should gear oil be changed?

Change drive gear oil every 100 hours or at least annually. If water or metal is found, pressure test and service seals before returning to service.

What information do you need to confirm part compatibility?

Please provide the engine serial number, drive serial number (Alpha/Bravo), fuel type (carb vs. EFI), and any known year range. A photo of the serial plates helps us verify the exact parts.

Ready to find parts by horsepower, year, and model? Browse the main MerCruiser collection and use Filter & Sort to narrow to your 260HP package.

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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.
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