Yanmar 4-Stroke 150-160HP Marine Engine Parts

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This page is dedicated to Yanmar 4-Stroke 150-160HP outboard engines. Use it to find compatible parts and service information, including maintenance tips, commonly replaced items, and troubleshooting guidance. You can also browse our main Yanmar collection, and at the bottom of this page you’ll find a direct path to start 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 150-160HP Model

Locate the engine nameplate: typically on the starboard side of the engine block or valve cover area; some installations also have a secondary tag on the transmission/drive or near the ECU harness.
Read the model code and suffix. Example format: 4LV150 or 4BY150; suffix letters can indicate emissions stage, control type, or drive configuration.
Confirm the rated horsepower on the plate (150–160 HP) and note serial/production numbers to verify year range when ordering parts.
Platform cues: 4LV engines are newer common-rail inline‑4 diesels; 4BY engines are earlier inline‑4 common‑rail designs. Visual differences include intake layout, ECU labeling, and front-accessory arrangements.

Platform Overview

Yanmar 4LV (e.g., 4LV150)

Feature	Description
Configuration	Inline‑4, common‑rail turbodiesel 4‑stroke
Common Models	4LV150 (and related LV‑series variants)
Advantages	Strong mid‑range torque, efficient fuel use, modern electronic control
Notes	Service items (filters, impeller, anodes) follow standard intervals; verify parts by model and serial to ensure correct kits.

Yanmar 4BY (e.g., 4BY150)

Feature	Description
Configuration	Inline‑4, common‑rail turbodiesel 4‑stroke
Common Models	4BY150 (and related BY‑series variants)
Advantages	Proven reliability, broad parts availability, good service access
Notes	Some filters and impeller kits differ from 4LV; match by full model code and serial.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical pleasure‑craft use. Always follow the procedure and schedule in your official Yanmar service manual for your exact model and operating conditions.

Item	Interval*	Remarks	Parts Link
Engine oil & oil filter	Every 100 hours or annually	Use marine‑grade oil to spec; replace filter at each oil change	Yanmar Oil filters
Primary/secondary fuel filters	Inspect every 50 hours; replace ~100 hours or as needed	Drain water separators frequently; carry spares aboard	Yanmar Fuel filters
Raw‑water pump impeller/kit	Every 2 seasons or sooner if flow weakens	Replace proactively to prevent overheating; inspect housing & wear plate	Water pumps
Anodes (engine/drive/heat exchanger)	Inspect 50 hours; replace when 50% consumed	Choose alloy for your water (zinc, aluminum, or magnesium)	Anodes
Air filter	Inspect 100 hours; replace as required	Keep intake clear for proper boost and airflow	Yanmar Air filters
Glow/Intake heater system (if equipped)	Pre‑season check	Verify pre‑heat operation and wiring integrity	Electrical Items
Stern drive/Saildrive gear oil (if equipped)	Every 100 hours or annually	Change more often if water intrusion is suspected; check for metal	Yanmar Service & Maintenance Kits

*Intervals are general guidelines; adjust for heavy use, commercial duty, or severe environments.

Frequently Used Parts Categories

Routine Service – Yanmar Service & Maintenance Kits
Fuel System – Yanmar Fuel filters
Filtration (Oil) – Yanmar Oil filters
Air Intake – Yanmar Air filters
Cooling System – Water pumps
Exhaust & Elbows – Yanmar Elbows
Corrosion Protection – Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak water stream / overheat alarm	Inspect raw‑water intake screen, impeller condition, and thermostat	Water pump impeller kit, intake screen, thermostat, anodes
Poor acceleration or power loss	Check fuel filters for restriction, verify clean air filter, and inspect charge‑air hoses for leaks	Fuel filters, air filter, turbo/intercooler hoses, clamps
Hard starting / rough idle	Prime fuel system, replace clogged filters, verify glow/intake pre‑heat and battery condition	Fuel filters, electrical items, battery cables, starter
Gearcase noise or metal in oil (sterndrive/saildrive)	Change gear oil; check for water intrusion and seal wear	Seal kit, gear oil drain gaskets, anodes

FAQs

Are parts interchangeable between different years or platforms (4LV vs 4BY)?

Some service items may look similar but differ in dimensions or fittings between platforms and years. Always confirm by full model code and engine serial number before ordering.

When should the impeller be replaced?

As a preventive measure, replace the raw‑water impeller about every two seasons (or sooner if you notice weak flow, overheating, or vane damage). Heavy use, silty water, or long storage periods justify shorter intervals.

How often should gear oil be changed on a sterndrive or saildrive?

Typically every 100 hours or annually. If the drained oil shows water contamination (milky) or metal, service seals immediately and shorten the service interval.

What information helps confirm part compatibility?

Provide the full engine model (e.g., 4LV150), serial/production number, drive type (inboard/sterndrive/saildrive), and any suffix letters from the nameplate.

Ready to find parts by horsepower, year, and model? Browse our main Yanmar collection and use the filters to narrow down to the exact components for your engine.

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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.