Yanmar 575HP 4-Stroke Outboard Marine Engine Parts

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This page supports Yanmar 4-Stroke 575HP outboard engines and helps you find compatible parts and service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Yanmar collection, and at the bottom of this page you’ll find a quick way to begin browsing parts for this engine. 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 575HP Model

Locate the nameplate/serial label on the transom bracket or under the cowling. It lists the model designation, serial number, and sometimes a production date.
Decode the model: horsepower rating plus suffixes for shaft length (L=20”, XL=25”, XXL=30”), starting/controls (e.g., electric start, power trim/tilt), and other options. The serial number helps confirm exact build details.
Confirm it is a 4-stroke platform: look for the oil fill/dipstick and external spin-on oil filter (locations vary by model). Emissions and engine family labels under the cowling can also help.
When in doubt, record the full model code and serial number from the plate and compare with your service manual or parts diagrams before ordering.

Engine Overview

High‑Output 4‑Stroke Outboard

Feature	Description
Configuration	Modern 4-stroke outboard platform with electronic fuel delivery and engine management; exact cylinder layout varies by model family.
Common Models	575HP 4-stroke outboard models (verify full model code and serial for parts compatibility).
Advantages	Strong torque and top-end power, improved fuel efficiency relative to legacy platforms, smooth operation, and reduced emissions.
Notes	Always match parts to the exact model code, serial range, and shaft length. Gearcase and rigging components can vary by application.

Routine Maintenance & Service Parts

Intervals below are general guidelines for heavy-duty 4‑stroke outboards. Always follow the official service manual for your exact model, operating profile, and environment.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	100 hrs or annually	Use marine 4‑stroke oil of the correct viscosity; replace crush washer where applicable.	Yanmar Oil filters
Gear oil (lower unit)	100 hrs or annually	Inspect magnetic drain plug; check for water intrusion. Replace seals if contamination is found.	Yanmar
Ignition plugs (gasoline) / glow plugs (diesel)	Inspect 100 hrs; replace as needed	Gap/torque correctly (gasoline). For diesel, test glow plug resistance and replace if weak.	Spark plug
Fuel filter(s) / water separator	100 hrs or annually; sooner if contaminated fuel	Drain water frequently; replace elements at interval or if restriction is noted.	Yanmar Fuel filters
Water pump impeller / kit	100–200 hrs or 1–2 seasons	Replace more often with sandy/silty use or weak telltale stream.	Water Pump Impeller Rebuild Kits
Anodes (internal & external)	Inspect every 50–100 hrs; replace when 50% depleted	Match alloy to water type (zinc/brackish, aluminum/salt, magnesium/fresh).	Anodes
Belts (alternator/timing as applicable)	Inspect 100 hrs; replace per manual	Check for cracks, glazing, and correct tension.	Belt
Charging system check	100 hrs or annually	Verify output voltage and inspect wiring/grounds; service battery as needed.	Alternators

Frequently Used Parts Categories

Routine Service Kits — Yanmar Service & Maintenance Kits
Cooling System — Water Pump Impeller Rebuild Kits
Fuel System — Yanmar Fuel filters
Ignition / Electrical — Electrical Items
Gaskets & Seals — Yanmar Gaskets
Corrosion Protection — Anodes
Propulsion — Propellers

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale stream or overheat alarm	Inspect intake screens for debris, verify impeller condition, confirm thermostat operation, and check for blocked passages.	Water pump kit, thermostat, intake screen, anodes
Hard starting or rough idle	Test battery/grounds, verify fuel quality and primer bulb, replace/inspect fuel filters, inspect spark plugs (gasoline) or glow plugs (diesel).	Fuel filters, spark plugs or glow plugs, electrical connections
Poor acceleration or power loss	Check propeller for damage or wrong pitch, look for fuel restriction, and confirm proper engine tune.	Propeller, fuel filter/water separator, plugs/injectors
Gearcase noise or metal in gear oil	Verify correct oil level; look for milky oil (water intrusion); inspect seals and bearings; listen for whine under load.	Lower unit seal kit, bearings, gear oil
Charging system not maintaining voltage	Check belt condition/tension (if applicable), inspect rectifier/regulator and alternator connections, load test battery.	Alternator, rectifier/regulator, belts, battery cables

FAQs

Are parts interchangeable between different years or platforms?

Some service items interchange across years, but high‑output outboards often have platform‑specific components (gearcase, rigging, electrical). Always confirm by model code, serial range, and shaft length before ordering.

When should the water pump impeller be replaced?

As a rule of thumb, replace every 100–200 hours or at least every 1–2 seasons. In sandy or silty environments, or if the telltale weakens, replace sooner.

How often should gear oil be changed?

Change every 100 hours or annually, and any time you find water contamination or metal on the magnetic drain plug. Inspect seals if contamination is present.

What information do you need to confirm part compatibility?

Please provide the full model designation, serial number, shaft length (L/XL/XXL), control type, and a clear photo of the nameplate. Photos of the existing part also help speed verification.

Ready to find parts by horsepower, year, and model? Browse the main Yanmar collection and use Filter & Sort to narrow down to what you need.

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If you’re unsure about your model, send us a clear photo of the nameplate and the part you need and we’ll help verify compatibility.