OMC 5HP 4-Stroke Marine Engine Parts

(5 products)

This page is tailored for OMC 4-Stroke 5HP outboard engines. Use it to quickly find compatible parts and service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Johnson/Evinrude/OMC collection. Scroll to the bottom to start browsing parts for this engine. On the collection page, use the Filter & Sort controls to narrow by horsepower, year range, and part category.

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How to Identify Your 5HP Model

Nameplate location: Look for the identification plate on the transom bracket (usually the port/left side) and for a secondary sticker under the engine cover.
Reading the code: Model strings typically include horsepower and suffixes for features. Common suffixes: S/L for 15D/20D shaft, R for rope start, E for electric start, T for tiller. The serial or production number helps confirm year and microfiche grouping.
4-stroke cues: Presence of an engine oil dipstick, oil fill cap, and oil filter confirm a 4-stroke. The top cowling often carries a “Four Stroke” decal.
Shaft length check: Measure from the transom bracket mounting surface to the anti-ventilation plate. ~15 inches = short (S); ~20 inches = long (L).

Engine Overview

OMC-Class 5HP 4-Stroke Portable

Feature	Description
Configuration	Single-cylinder, carbureted 4-stroke with CDI ignition; manual start (some variants offer charging coil/electric start)
Common Models	Johnson/Evinrude-branded 5HP 4-stroke portable models (short and long shaft variants)
Advantages	Quiet operation, low fuel consumption, easy portability, strong trolling control
Notes	Many wear items (impellers, anodes, spark plugs) cross over with 4–6HP families. Always match parts by model and serial for best compatibility.

Routine Maintenance & Service Parts

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

Item	Interval*	Remarks	Parts Link
Engine oil + filter	First 20 hours, then every 100 hours or annually	Warm engine before draining; replace crush washer if equipped; verify capacity	Oil Filters
Gear oil (lower unit)	Every 100 hours or annually; inspect after impacts	Look for water intrusion (milky oil) or metal fines; replace sealing washers	Johnson/Evinrude/OMC Lower Unit Seal Kits
Spark plugs	Inspect every 100 hours; replace 200 hours or annually	Gap to spec; replace if fouled or worn	Spark Plugs
Fuel filter / water separator	Inspect 50 hours; replace 100 hours or as needed	Use fresh, ethanol-stable fuel; drain contaminants	Fuel Filters
Water pump impeller/kit	Every 2 seasons or 200 hours (annually in sandy/silty water)	Restore tell-tale flow and cooling performance	Johnson/Evinrude/OMC Water Pump Repair Kits
Anodes (zinc/aluminum/magnesium)	Inspect every 50 hours; replace at ~50% depletion	Select alloy for your water type (salt, brackish, fresh)	Johnson/Evinrude/OMC Anodes

Frequently Used Parts Categories

Routine Service Johnson/Evinrude/OMC Service & Maintenance Kits
Cooling System Johnson/Evinrude/OMC Water Pump Repair Kits
Fuel System Fuel Filters and Carburetor
Ignition / Electrical Electrical Items
Gearcase & Sealing Johnson/Evinrude/OMC Lower Unit Seal Kits
Propellers Johnson/Evinrude/OMC Propellers and Propeller Guards
Gaskets & Sealing Johnson/Evinrude/OMC Gaskets

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell-tale stream or overheat alarm	Inspect intake screens for blockage; verify impeller age; check thermostat operation	Water pump kit, intake screens, thermostat, housing gasket
Hard starting or rough idle	Confirm fresh fuel; prime bulb; clean/adjust idle mixture; inspect spark plug condition	Spark plug, fuel filter, carburetor rebuild kit, fuel hoses
Poor acceleration or power loss	Check propeller for damage/cavitation; verify throttle linkage and compression; clean main jet	Propeller, prop hardware, fuel pump, carburetor jets, gaskets
Gearcase noise or metal in gear oil	Drain and inspect oil; pressure/vacuum test seals; check for fishing line at prop shaft	Lower unit seal kit, bearings, prop shaft seals, drain/fill washers
High idle or surging (warm)	Look for vacuum leaks; verify carburetor cleanliness; confirm governor/linkage settings	Carburetor kit, intake gasket, fuel hoses, governor/linkage clips

FAQs

Are parts interchangeable between different years or related 4HP platforms?

Some wear items are shared across 4–6HP 4-stroke families, but revisions by year and shaft/start options can change part fit. Always confirm your exact model and serial before ordering.

When should I replace the impeller?

For most small outboards, replace the impeller every 2 seasons or ~200 hours. In sandy, silty, or weedy waters, a yearly change is prudent to protect the powerhead.

How often should I change gear oil?

Service the gearcase every 100 hours or annually, and anytime you suspect impact or see water intrusion. Replace drain/fill sealing washers to ensure a proper seal.

What information helps confirm compatibility?

Provide the model code, serial/production number, shaft length (S/L), start type (R/E), and a photo of the nameplate. Photos of the old part also help with quick cross-reference.

Ready to find parts by horsepower, year, and model? Browse the full Johnson/Evinrude/OMC catalog and filter to your engine.

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If youFre unsure about your model, send us a photo of the nameplate and the part you need and weFll help verify compatibility.