Yanmar 4-Stroke 38HP Marine Engine Parts

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This page is tailored for Yanmar 4-Stroke 38HP outboard engines. It helps you quickly find compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Yanmar 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 38HP Model

Nameplate/serial plate: Typically on the transom bracket or swivel bracket (port or starboard side). Record the full model code and serial number.
Model code and suffix: Suffix letters often indicate shaft length (S/L/XL), control type (tiller vs. remote), and other options. Note these when ordering parts.
4‑Stroke specifics: Confirm whether your engine uses EFI or carburetion, as fuel and ignition components can differ.
Visual cues: Cowling decals and midsection features (e.g., gearcase shape, intake silencer) help distinguish sub-variants within the 30–40 HP class.

Engine Overview

4‑Stroke Inline Platform (38 HP class)

Feature	Description
Configuration	Compact 4‑stroke inline platform typically used in the 30–40 HP range; quiet operation, good fuel economy.
Common Models	38 HP 4‑stroke models in short/long shaft variants (model code suffixes denote options such as tiller/remote control).
Advantages	Low vibration and noise, strong mid‑range torque, and reduced emissions compared to older 2‑stroke designs.
Notes	Verify model code and serial before ordering; ignition, fuel, and cooling parts may vary by year, shaft length, and control configuration.

Routine Maintenance & Service Parts

Intervals below are general guidelines for many 4‑stroke outboards. Always follow the service schedule and specifications in your official owner’s/service manual.

Item	Interval*	Remarks	Parts Link
Engine oil & filter	100 hours or annually	Use marine‑grade 4‑stroke oil; replace filter at each oil change.	Yanmar Oil Filters
Gear oil (lower unit)	100 hours or annually	Inspect magnetic plug for metal; replace drain/fill gaskets when servicing.	Yanmar Collection
Spark plugs	100–200 hours or annually	Check gap and replace if fouled, worn, or out of spec.	Spark Plug Collection
Fuel filter / water separator	100 hours or as needed	Replace more often with poor fuel quality or storage issues.	Yanmar Fuel Filters
Water pump impeller/kit	Every 2–3 seasons or 200 hours	Replace sooner if weak tell‑tale or overheat alarm occurs.	Water Pump Impeller Rebuild Kits
Anodes (gearcase/engine)	Inspect every 3 months; replace when 50% consumed	Use alloy appropriate for your water (aluminum, magnesium, or zinc).	Anodes

Frequently Used Parts Categories

Routine Service Kits – Yanmar Service & Maintenance Kits
Fuel System – Yanmar Fuel Filters
Lubrication – Yanmar Oil Filters
Cooling System – Water Pump Impeller Rebuild Kits
Corrosion Protection – Anodes
Electrical/Charging – Rectifiers
Propulsion – Propellers

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens for blockage, check impeller age, verify thermostat operation.	Water pump impeller kit, intake screen, thermostat.
Hard starting or rough idle	Confirm fresh fuel, replace/bleed fuel filter, inspect plugs and idle speed settings.	Fuel filter/water separator, spark plugs, air/fuel hoses.
Poor acceleration or power loss	Check prop condition/pitch, verify fuel supply and compression, confirm throttle opens fully.	Propeller, fuel filter, ignition components, intake silencer elements.
Gearcase noise or metal in gear oil	Inspect gear oil color and smell; check for water intrusion and seal damage.	Drain/fill plugs and gaskets, lower unit seal kit, prop shaft seals.

FAQs

Are parts interchangeable between different years or platforms?

Some service items (anodes, filters, and impellers) can overlap across 30–40 HP 4‑stroke models, but ignition, fuel, and cooling components often change by year and model code. Always confirm with your model code and serial number.

When should I replace the water pump impeller?

As a preventive measure every 2–3 seasons or ~200 hours. Replace sooner if the tell‑tale is weak, you run in sandy/silty water, or you trigger an overheat alarm.

How often should I change lower unit gear oil?

Inspect at 50 hours on new-to-you equipment, then replace every 100 hours or annually. If you see water contamination (milky oil) or metal particles, service seals before further use.

What information do you need to confirm part compatibility?

Please provide the full model code, serial number, shaft length (S/L/XL), and control type (tiller or remote). Photos of the nameplate and the part being replaced are very helpful.

Ready to find parts for your Yanmar 4‑Stroke 38HP outboard? Browse the main Yanmar collection and filter by horsepower, year, and part category.

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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.