Yanmar 4-Stroke 240HP Marine Engine Parts

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This page is dedicated to Yanmar 4-Stroke 240HP outboard engines and helps you quickly find compatible parts and practical service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Yanmar collection at any time. Scroll to the bottom of the page to start browsing parts for this engine, and remember you can use the Filter & Sort controls on the collection page to narrow results by horsepower, year range, and part category.

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How to Identify Your 240HP Model

Locate the engine identification plate: commonly on the rocker cover or side of the engine block. On some installations it may be on the mounting bracket or near the heat exchanger/transmission bellhousing.
Read the model code and suffix: example codes often seen around this power are 4LHA-STP/4LHAM-STP. Suffixes can indicate rating, drive type, or specific equipment (e.g., panel type, gearbox).
Confirm configuration details: a 240HP Yanmar at this level is typically an inline-4, direct-injection, turbocharged and aftercooled 4-stroke diesel. Note exhaust elbow style (L-type vs. high-riser), alternator output, and control panel type.
Record the full serial number and any gearbox/drive identifiers; this helps verify filter sets, elbows, belts, and raw-water pump components.

Engine Overview

Inline-4 Turbo Diesel (4LHA‑STP family, ~240 HP)

Feature	Description
Configuration	Inline‑4, direct-injection, turbocharged and aftercooled 4‑stroke diesel (fresh-water cooled with raw-water heat exchanger).
Common Models	Examples include 4LHA‑STP / 4LHAM‑STP around the 240 HP rating.
Advantages	Strong torque and efficiency in a compact package; widely supported filter sets and service items; robust raw‑water pump and heat exchanger system.
Notes	Service consumables (oil, fuel, air filters), raw‑water impellers, anodes, belts, and exhaust elbows are routine replacements. Confirm elbow height and panel/alternator specs before ordering.

Routine Maintenance & Service Parts

Intervals below are general guidelines; always follow your official Yanmar service manual and local operating conditions.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	Every 100 hours or annually	Use marine‑approved oil; replace filter at each oil change and check for leaks.	Yanmar Oil Filters
Fuel filters (primary/secondary)	100–200 hours or if contaminated	Replace both water‑separating and engine filters; bleed the system after service.	Yanmar Fuel Filters
Air filter	Inspect 100 hours; replace 200–300 hours	Clean/replace sooner in dusty or sooty environments to protect turbo and cylinders.	Yanmar Air Filters
Raw‑water pump impeller	Every 200 hours or 2 years	Replace preventatively; inspect pump cam, cover, and seals for wear.	Impellers
Anodes (engine/heat exchanger)	Inspect 100 hours; replace as needed	Check sacrificial anodes in the cooling system to control corrosion.	Anodes
Gear oil (drive/gearcase)	Every 100 hours or annually	For outboard/sterndrive gearcases: change oil and inspect for water intrusion/metal.	Lower Unit Seal Kits
Belts (alternator/raw‑water)	Inspect 100 hours; replace if worn	Adjust tension; replace if cracked, glazed, or slipping.	Belts
Exhaust mixing elbow	Inspect annually	Monitor for internal scaling/corrosion; replace elbow or gasket if restricted.	Yanmar Elbows

Frequently Used Parts Categories

Routine Service Kits – Yanmar Service & Maintenance Kits
Fuel Filtration – Yanmar Fuel Filters
Oil Filters – Yanmar Oil Filters
Cooling System – Water Pumps
Exhaust & Elbows – Yanmar Elbows
Turbo & Charge Air – Yanmar Turbos
Corrosion Protection – Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak water stream or overheat alarm	Inspect intake screen, raw‑water pump impeller, thermostat, and heat exchanger for blockage.	Water pump impeller kit, thermostat, anodes, intake screen
Poor acceleration or power loss	Check fuel filters for restriction, air filter condition, turbo hoses/clamps for leaks, and exhaust elbow for carbon scale.	Fuel filters, air filter, turbocharger, exhaust mixing elbow
Hard starting or rough idle	Verify battery health and connections, look for air ingress at fuel lines, and confirm clean fuel supply.	Starters, sensors, fuel filters
Gearcase noise or metal in gear oil	Check drive oil condition, propeller for damage, seals for water intrusion; service promptly.	Lower unit seal kit, bearings, propeller

FAQs

Are parts interchangeable between different years or platforms?

Some filters and general service items are shared across Yanmar 4‑cylinder families, but exhaust elbows, belts, panels, alternators, and raw‑water pump components can differ by model year, rating, and installation. Always match by full model code and serial number.

When should the impeller be replaced?

As a preventive measure, replace the raw‑water pump impeller every 200 hours or 2 years, sooner if run dry or if cooling flow weakens. Inspect the cam, cover plate, and seals during each service.

How often should gear oil be changed?

For outboard/sterndrive gearcases, change gear oil every 100 hours or annually, and immediately if water or metal is found. Follow the drive manufacturer’s specification for oil type and capacity.

What information do you need to confirm part compatibility?

Provide the full model code (e.g., 4LHA‑STP), serial number, control panel type, alternator rating, exhaust elbow style (L vs. high‑riser), and details on your drive or gearbox. Photos of the nameplate and the part location also help.

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