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MerCruiser 4-Stroke 260-385HP Marine Engine Parts

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This page is for MerCruiser 4-Stroke 260–385HP outboard engines. It helps you find compatible parts and key 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/section.

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How to Identify Your 260–385HP Model

  • Locate the serial/nameplate: typically on the engine assembly (starboard side of the block or flame-arrestor cover) and on the transom/drive bracket. Photograph these plates before ordering.
  • Read the model descriptors: displacement (5.7L/350, 6.2L, 8.2L), fuel/controls (MPI, DTS), and drive family (Alpha/Bravo). These affect gaskets, pumps, and ignition/electrical parts.
  • Distinguish platforms: Small‑block V8 (5.7L/6.2L, 300–350 HP) vs Big‑block V8 (8.2L, 380–385 HP). Cooling and exhaust layouts differ between platforms and serial ranges.
  • It’s a 4‑stroke: engine oil and a spin‑on oil filter are serviced separately from the drive unit gear oil. Always confirm by serial number when selecting kits.

Engine Overview

V8 Small‑Block Platform (5.7L / 6.2L)

Feature Description
Configuration V8 gasoline 4‑stroke with multi‑port fuel injection; common outputs 300–350 HP.
Common Models 350 MAG MPI 300 HP; 6.2L 300/350 HP; 383 MAG Stroker 350 HP.
Advantages Broad torque curve, solid mid‑range power, wide parts availability.
Notes Manifolds/risers, raw‑water pumps, and serpentine belt setups vary by serial range and drive family (Alpha/Bravo). Verify serial number for an exact fit.

V8 Big‑Block Platform (8.2L)

Feature Description
Configuration V8 gasoline 4‑stroke with EFI; typical outputs 380–385 HP.
Common Models 8.2 MAG 380 HP; 8.2 Horizon 375/385 HP.
Advantages High torque for heavier boats, strong holeshot, robust cooling hardware.
Notes Exhaust components and raw‑water pump styles differ from small‑block setups; match by exact model/serial. Anode kits and gear lube capacity vary by drive.

Routine Maintenance & Service Parts

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

Item Interval* Remarks Parts Link
Engine oil & filter 100 hours or annually Use marine‑grade 4‑stroke oil; warm engine before draining for a complete change. MerCruiser Oil Filters
Gear oil (drive unit) 100 hours or at seasonal lay‑up Inspect for water intrusion/metal fines; replace sealing washers as needed. MerCruiser
Spark plugs 100 hours or annually Check gap and replace sooner if misfire or rough idle occurs. Spark Plugs
Fuel filter / water separator 50–100 hours or annually Drain bowl for water; replace cartridge if flow drops or contamination is present. MerCruiser Fuel Filters
Raw‑water pump impeller/kit Every 2 seasons or ~200 hours Replace sooner if overheat alarms, weak flow, or vane set memory is observed. MerCruiser Impellers
Anodes (engine/drive) Inspect every 50 hours; replace when 50% depleted Choose alloy for your water (zinc—salt, aluminum—brackish, magnesium—fresh). MerCruiser Anodes
Serpentine/drive belt Inspect at 100 hours; replace if cracked or glazed Check tensioner and idlers; a slipping belt can cause overheat and charging issues. Belts

Frequently Used Parts Categories

Common Symptoms & Quick Checks

Symptom Check First Related Parts
Overheat alarm or rising temperature Inspect seawater intake screens/strainers, raw‑water pump impeller, and thermostat; verify belt drive to circulation pump. Water pump impeller kit, thermostat, intake screen/strainer, serpentine belt
Poor acceleration or power loss Check propeller condition/pitch, fuel quality (water in separator), and air/fuel filters; review ignition (plugs/wires) and throttle linkage. Propeller, fuel filter/water separator, spark plugs, air filter, fuel pump
Hard starting or rough idle Verify battery state and connections, replace fouled plugs, inspect vacuum leaks and dirty throttle body; ensure clean fuel supply. Battery cables, spark plugs, fuel filter, intake gaskets
Gearcase noise or metal in gear oil Check gear lube level/condition; inspect prop shaft for fishing line (seal damage); listen for U‑joint/gimbal bearing noise. Gear oil, prop shaft seals, gimbal bearing, U‑joints
Trim/tilt not operating Test battery voltage, trim switches/relays, and fluid level; inspect harness/grounds. Trim motor, relays/solenoids, hydraulic fluid, wiring

FAQs

Are parts interchangeable between different years or platforms?

Some service parts overlap, but many items (cooling, exhaust, ignition/electronics) change with platform and serial range. Always confirm your engine’s serial number and displacement (5.7L/6.2L/8.2L) before purchasing.

When should the raw‑water impeller be replaced?

As a preventive measure, replace every two seasons or about 200 hours. Replace immediately if you see weak flow, overheating, or vane damage during inspection.

How often should gear oil be changed?

Change every 100 hours or at seasonal lay‑up. Inspect for milky color (water) or metallic particles. Replace sealing washers and address any leaks before operating again.

What information do you need to confirm part compatibility?

Provide the engine serial number, displacement (5.7L/6.2L/8.2L), drive family (Alpha/Bravo), and any descriptors like MPI or DTS. A photo of the nameplate and the part needing replacement is very helpful.

Ready to find the parts you need? Browse the main MerCruiser collection and use horsepower, year, and model filters to narrow your search.

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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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