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OMC 4-Stroke 8.2L Marine Engine Parts

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This page is for OMC 4‑Stroke 8.2L marine engines and is designed to help you find compatible parts and service information. Below you’ll find maintenance tips, commonly replaced parts, and troubleshooting guidance. You can also browse our main Johnson/Evinrude/OMC collection anytime. Scroll to the bottom of this 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.

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How to Identify Your 8.2L Model

  • Nameplate/serial plate: Look on the engine block or valve cover, and on the transom bracket or drive housing for sterndrive packages. Record both the engine serial and the drive model if equipped.
  • Model code and suffix: Codes often indicate displacement (8.2L), induction type (carbureted vs. EFI), cooling (raw water vs. closed), and year/production revisions.
  • Drive identification: OMC Cobra/King Cobra sterndrive tags are typically on the upper gearcase. Gear ratio and year help confirm seal kit and water pump compatibility.
  • 4‑Stroke cues: Presence of an engine oil filter, valve covers, and a separate gearcase with drain/fill plugs (for sterndrives) help confirm parts selection.

Engine Overview

OMC 8.2L V8 (Carbureted)

Feature Description
Configuration V8, 4‑stroke gasoline, carbureted; commonly paired with OMC Cobra/King Cobra sterndrives.
Common Models 8.2L big‑block packages used in heavy runabouts, cruisers, and workboats.
Advantages Strong low‑to‑midrange torque; straightforward service with conventional ignition/fuel systems.
Notes Match water pump and seal kits by drive model and year; verify ignition components and fuel filter style before ordering.

OMC 8.2L V8 (EFI)

Feature Description
Configuration V8, 4‑stroke gasoline with electronic fuel injection; sterndrive propulsion.
Common Models Late‑production big‑block OMC packages in performance and cruiser applications.
Advantages Smoother cold starts, improved fuel metering, and better altitude/temperature compensation.
Notes Confirm sensor and fuel filter part styles; impeller and gearcase parts are selected by the sterndrive model and year.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow the official service manual for your exact model, operating profile, and environment.

Item Interval* Remarks Parts Link
Engine oil + filter Every 100 hours or annually Use marine‑rated oil; replace filter at each oil change. Oil Filters
Gear oil (sterndrive) Every 100 hours or annually Inspect drain/fill seals and magnetic plug for debris. Johnson/Evinrude/OMC Lower Unit Seal Kits
Spark plugs Inspect 100 hours; replace 200 hours or as needed Gap to spec; replace fouled or worn plugs. Spark Plugs
Fuel filter / water separator Every 100 hours or annually Drain separator and replace elements regularly; ethanol fuel may require shorter intervals. Fuel Filters
Water pump impeller/kit Every 2 seasons (sooner in sandy/silty water) Critical for cooling; replace housing if scored or warped. Johnson/Evinrude/OMC Water Pump Repair Kits
Anodes (corrosion protection) Inspect every 50 hours; replace when 50% consumed Match alloy to water type (zinc/salt, aluminum/brackish, magnesium/fresh). Johnson/Evinrude/OMC Anodes
Accessory/serpentine belt Inspect 100 hours; replace 2 years or as needed Check for cracks, glazing, tensioner wear. Belts
Charging system check Annually Verify output and connections; inspect pulleys and wiring. Alternators

Frequently Used Parts Categories

Common Symptoms & Quick Checks

Symptom Check First Related Parts
Weak water stream or overheat alarm Inspect intake screens, hose clamps, and thermostat; verify impeller condition. Water pump kit, intake screen, hoses, thermostat
Poor acceleration or power loss Check propeller condition, fuel quality, and filter restriction; verify ignition timing and plug condition. Fuel filter, spark plugs, propeller hardware
Hard starting or rough idle Confirm battery voltage and cable integrity; inspect plugs and ignition leads; look for water in fuel. Spark plugs, starter/solenoid, fuel filter
Gearcase noise or metal in gear oil Check gear oil level/condition; inspect for leaking propshaft/driveshaft seals. Lower unit seal kit, drain/fill seals, bearings
Charging warning or low voltage Verify belt tension, alternator output, and wiring connections/grounds. Alternator, belt, rectifier/regulator

FAQs

Are parts interchangeable between different years or platforms?

Some service parts carry over, but OMC had variations across carb vs. EFI engines and Cobra vs. King Cobra sterndrives. Always confirm engine model/serial and drive model/year before ordering.

When should the impeller be replaced?

As a rule, replace every two seasons or sooner if you see weak flow, high temps at idle, or if you operate in sandy/silty water. Replace the full kit if the housing is scored.

How often should the gear oil be changed?

Change sterndrive gear oil every 100 hours or annually. Inspect the magnetic plug and oil for metal or water intrusion and renew drain/fill seals.

What information do you need to confirm part compatibility?

Provide the engine model and serial, driveline type (Cobra/King Cobra), gear ratio if known, and clear photos of the nameplate and the old part. This ensures we match the correct components.

Ready to find parts? Browse the main Johnson/Evinrude/OMC collection and filter by horsepower, year, and model to quickly narrow your results.

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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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