Yanmar 4-Stroke 135HP Outboard Marine Engine Parts

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This page is dedicated to Yanmar 4-Stroke 135HP outboard engines. Use it to find compatible parts and service guidance. Below you’ll find maintenance tips, common replacement parts, and troubleshooting help. You can also browse the main Yanmar collection. Scroll to the bottom of this 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/section.

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How to Identify Your 135HP Model

Locate the identification plate or decal on the transom/clamp bracket or swivel bracket. It typically lists model, serial number, and sometimes shaft length.
Read the full model code: suffixes can indicate shaft length (S/L/XL), control type (tiller/remote), and production revision or year code.
Confirm it’s a 4-stroke platform by checking for an engine oil dipstick/oil fill cap and a separate engine oil filter.
Record the serial number before ordering; it helps verify fit for ignition, fuel, and cooling components.

Engine/Platform Overview

Typical 4‑Stroke 135HP Outboard Platform

Feature	Description
Configuration	Inline‑4, 4‑stroke, EFI (electronic fuel injection) with modern ignition and a conventional gearcase.
Common Models	135HP 4‑stroke outboard variants with short/long/extra‑long shafts; remote or tiller configurations depending on boat setup.
Advantages	Quiet operation, solid mid‑range torque, good fuel efficiency, and broad parts availability for routine service.
Notes	Match parts to model code and serial. Some items (filters, anodes, impellers) require platform‑specific dimensions—verify before purchase.

Routine Maintenance & Service Parts

Intervals below are general guidelines for a 4‑stroke 135HP outboard. Always defer to your engine’s official service manual for exact procedures and schedules.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	Every 100 hours or annually	Warm the engine before draining; replace crush washers as required; verify capacity and viscosity spec.	Yanmar Oil filters
Gear oil (lower unit)	Every 100 hours or annually	Inspect for metal flakes and water intrusion; replace drain screw gaskets; pressure/vacuum test if contamination is found.	Lower Unit Seal Kits
Spark plugs	Inspect every 100 hours; replace as needed	Gap to spec; look for fouling or uneven coloration indicating mixture or ignition issues.	Spark plug
Fuel filter / water separator	Every 100 hours or annually	Drain water traps; replace elements sooner in high‑contamination environments or with ethanol fuels.	Yanmar Fuel filters
Water pump impeller/kit	Inspect annually; replace every 2–3 seasons or sooner if flow weakens	Essential for cooling; replace housing/key/seals as needed; ensure tell‑tale stream is strong.	Water Pump Impeller Rebuild Kits
Anodes (internal/external)	Inspect every 3–6 months; replace when 50% wasted	Select the correct alloy for your water (zinc, aluminum, or magnesium); clean contact surfaces.	Anodes
Air filter/strainer (if equipped)	Inspect every 100 hours	Keep intake clear; replace if contaminated by salt spray or debris.	Yanmar Air filters

Frequently Used Parts Categories

Routine Service: Yanmar Service & Maintenance Kits
Cooling System: Water Pump Impeller Rebuild Kits
Fuel System: Yanmar Fuel filters and Fuel Pumps
Ignition/Electrical: Spark plug and Starters
Corrosion Protection: Anodes
Seals & Drivetrain: Lower Unit Seal Kits
Gaskets & Wear Items: Yanmar Gaskets and Yanmar Bearings

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens for debris; verify impeller condition; check thermostat operation.	Water pump kit, intake screen, thermostat, gaskets
Hard starting or rough idle	Confirm fresh fuel; inspect spark plugs; check for water in fuel filter; verify battery voltage and connections.	Spark plugs, fuel filter, fuel pump, battery cables
Poor acceleration or power loss	Check prop condition/pitch, fuel delivery, and for any stored fault codes; ensure throttle opens fully.	Fuel filters, fuel pump, spark plugs, anodes (for corrosion on sensors), gaskets
Gearcase noise or milky gear oil	Drain and inspect oil; check for water intrusion; pressure/vacuum test and inspect seals.	Lower unit seal kit, drain screw gaskets, bearings

FAQs

Are parts interchangeable between different years or platforms?

Some service items carry across years, but many parts (impellers, anodes, filters, sensors) are model and serial specific. Always confirm your exact model code and serial number before ordering.

When should the water pump impeller be replaced?

Inspect annually and replace every 2–3 seasons, or immediately if the tell‑tale weakens, the engine overheats, or the impeller shows cracks or set‑memory.

How often should gear oil be changed?

At least every 100 hours or annually. If you see milky oil or metal flakes, service the gearcase and replace seals as needed after pressure/vacuum testing.

What information do I need to confirm part compatibility?

Provide the full model code, serial number, shaft length, and any noted suffixes. Photos of the nameplate and the part you’re replacing are also helpful.

Ready to find parts by horsepower, year, and model? Browse the main Yanmar collection to get started.

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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.