Yanmar 35HP 4-Stroke Marine Engine Parts

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This page is for Yanmar 4‑Stroke 35HP outboard engines. It helps you 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 the 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 35HP Model

Nameplate/serial plate: Usually on the engine block or flywheel housing; if equipped with a saildrive, a second label may be on the upper gearcase.
Reading the model code: Yanmar small 3‑cylinder engines use codes like 3YM or 3JH with suffixes that can denote drive type (KM gearbox or SD saildrive), panel/electronics, and revision. The serial number determines exact build options.
Platform differences: 4‑stroke diesel models may be mechanically injected (e.g., 3YM family) or common‑rail (e.g., newer 3JH family). Common‑rail engines have an ECU and high‑pressure rail/sensor on the cylinder head.
Shaft/drive identification: Shaft‑drive engines pair to KM gearboxes; saildrive boats use SD units (e.g., SD60). Parts for the seawater pump, anodes, and prop/drive seals vary by drive type.

Engine/Platform Overview

3‑cylinder mechanical‑injection (approx. 30–35 HP class)

Feature	Description
Configuration	Inline‑3, 4‑stroke diesel with mechanical fuel injection; freshwater cooling via heat exchanger; belt‑driven seawater pump.
Common Models	3‑cylinder Yanmar models in the 25–35 HP class (e.g., 3YM/3GM families). Verify exact model and serial for parts.
Advantages	Simple, proven design; easy routine service; broad global parts support.
Notes	Service seawater impeller annually; inspect exhaust mixing elbow and heat‑exchanger anodes; saildrive units (if fitted) require dedicated gear oil and anodes.

3‑cylinder common‑rail (CR) 4‑stroke (approx. 35–40 HP)

Feature	Description
Configuration	Inline‑3, 4‑stroke diesel with high‑pressure common‑rail and ECU; freshwater cooling; belt‑driven seawater pump.
Common Models	3JH family (e.g., 3JH40). Confirm by model/serial, control panel, and drive type for exact part fit.
Advantages	Smooth running, improved fuel efficiency, integrated diagnostics.
Notes	Use the correct CR‑rated fuel filters; keep electrical connectors clean/dry; follow ECU battery voltage requirements.

Routine Maintenance & Service Parts

Intervals below are general guidelines commonly used in the field. Always follow the service schedule and specifications in your official Yanmar manual for your exact model and drive.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	Every 100 hours or annually	Use marine diesel‑rated oil; change hot; replace crush washer if applicable.	Yanmar Oil Filters
Fuel filter (secondary on engine)	200 hours or annually	Pre‑fill with clean diesel where specified; bleed system after service.	Yanmar Fuel Filters
Primary fuel/water separator (hull side)	Inspect every 50 hours; service annually	Drain water as needed; replace element at least annually.	Fuel Filters
Seawater pump impeller	100–200 hours or annually	Inspect cover and wear plate; replace sooner if flow weak or after dry‑run.	Impellers
Heat‑exchanger/saildrive anodes	Inspect every 50 hours; replace when 50% wasted	Critical for corrosion protection in brackish/salt water.	Anodes
Drive gear oil (saildrive, if equipped)	First 100 hours, then annually	Check for water intrusion (milky oil); renew sealing washers.	Yanmar Service & Maintenance Kits
V‑belt (alternator/pump)	Inspect every 100 hours	Check tension and cracks; replace if glazed or frayed.	Belts
Air filter	Inspect every 100 hours	Replace sooner in dusty or engine‑room lint conditions.	Yanmar Air Filters
Thermostat & gasket	Every 2 years (typical)	Replace if overheat issues persist after impeller service.	Yanmar Gaskets

Frequently Used Parts Categories

Routine Service Kits — Yanmar Service & Maintenance Kits
Oil & Filters — Yanmar Oil Filters
Fuel System — Yanmar Fuel Filters
Cooling System (pumps & impellers) — Water Pumps
Exhaust Mixing Elbows — Yanmar Elbows
Electrical & Sensors — Sensors
Starting/Charging — Starters

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak water stream or overheat alarm	Inspect intake screen, hoses, and tell‑tale; check impeller and thermostat; verify anodes are intact.	Water pump/impeller kit, thermostat, intake screen, anodes
Poor acceleration / power loss	Check for clogged fuel filters or air filter; inspect exhaust mixing elbow for carbon/salt restriction; confirm clean prop.	Fuel filters, air filter, exhaust mixing elbow, hoses
Hard starting or rough idle	Verify battery voltage and cranking speed; bleed air from fuel system after any service; on CR models, check sensor connections.	Fuel filters, electrical items/connectors, starter, sensors
Milky gear oil or gear noise (saildrive)	Look for water intrusion at shaft seals; renew oil and re‑inspect; verify anodes are present and sized correctly.	Lower unit/seal kit, anodes, gear oil service items
Sooty exhaust or smoke under load	Check air filter for restriction; inspect turbo/charge‑air hoses (if fitted); confirm clean fuel and correct prop load.	Air filter, hoses/clamps, injectors

FAQs

Are parts interchangeable between different years or platforms?

Many Yanmar service parts are used across families, but filters, belts, sensors, and exhaust elbows often change by model revision, control panel, and drive (KM gearbox vs SD saildrive). Always confirm by model and serial number.

When should I replace the seawater impeller?

Replace the impeller every 100–200 hours or annually (whichever comes first). Replace immediately if the water stream is weak, the pump has run dry, or pieces are missing from the vanes.

How often should saildrive gear oil be changed?

Typically at 100 hours for the initial change, then annually. Inspect for water intrusion and renew sealing washers as required. Follow the specific interval and oil spec in your Yanmar manual.

What information do you need to confirm part compatibility?

Please provide the engine model code, full serial number, drive type (KM gearbox or SD saildrive), and any control panel/electronics details. Photos of the nameplate and the part to be replaced are very helpful.

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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.