Yanmar 17HP 4-Stroke Marine Engine Parts

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This page is for Yanmar 4-Stroke 17HP marine 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 down to the bottom of the page 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.

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How to Identify Your 17HP Model

Nameplate location: Look for the Yanmar model/serial plate on the engine block near the injection pump, on the valve cover, or on the transmission/saildrive housing.
Model code and suffix: Yanmar small diesels often show a series (e.g., GM or YM) plus numbers. Suffix letters can indicate configuration options such as cooling arrangement (raw-water vs. freshwater/heat exchanger) or other features.
Platform clues: A 17HP rating typically falls in the small twin-cylinder range. GM-series (e.g., 2GM20/2GM20F) and YM-series (e.g., 2YM15, 3YM20) have different service parts—confirm your exact series.
Serial number: Note the full serial number from the plate to verify year/variant when selecting filters, gaskets, and service kits.

Engine Overview

GM-Series Small Twin-Cylinder Diesels (e.g., 2GM20 / 2GM20F)

Feature	Description
Configuration	Inline-2, mechanically injected 4-stroke marine diesel; typically raw-water or freshwater (heat exchanger) cooled.
Common Models	Examples include 2GM20 and 2GM20F in the ~18 HP class; many consumables are series-specific.
Advantages	Simple, durable design with wide parts availability; good torque and serviceability.
Notes	Cooling configuration and serial range affect impellers, anodes, and gasket sets—confirm details before ordering.

YM-Series Compact Diesels (e.g., 2YM15 / 3YM20)

Feature	Description
Configuration	Modern inline-2/inline-3 4-stroke marine diesels with refined combustion and updated peripheral components.
Common Models	Examples include 2YM15 (~15 HP) and 3YM20 (~21 HP); a 17HP application often cross-shops these platforms.
Advantages	Smooth running, efficient fuel use, compact footprint.
Notes	Filters, belts, and cooling parts differ from GM-series—use model and serial to confirm compatibility.

Routine Maintenance & Service Parts

Intervals below are general guidelines for small Yanmar 4-stroke diesel engines. Always follow the official service manual and your vessels duty cycle.

Item	Interval*	Remarks	Parts Link
Engine oil & filter	Every 100 hours or annually	Warm engine before draining; replace crush washer/gasket as required.	Yanmar Oil Filters
Primary/secondary fuel filters	Every 100 hours or seasonally	Drain water separators; bleed system after filter changes.	Yanmar Fuel Filters
Air filter / intake screen	Inspect 50 hours; replace as needed	Clean and ensure intake is free of obstructions; replace if oil-soaked or damaged.	Yanmar Air Filters
Raw-water pump impeller	Every 200 hours or annually	Replace sooner if flow is weak or after dry-run/overheat; carry a spare onboard.	Impellers
Cooling system anodes (HX/saildrive)	Inspect quarterly; replace when 50% consumed	Use the correct alloy for your water (salt/brackish/fresh).	Anodes
Drive belt (alternator/raw-water pump)	Inspect 100 hours; replace 200 hours or if cracked	Set correct tension; recheck after first run-in.	Belts
Exhaust mixing elbow inspection	Inspect annually; replace as needed	Look for internal corrosion/restriction causing high temps or smoke.	Yanmar Elbows
Thermostat & housing gasket	Every 2 years or if overheat/slow warm-up	Replace gasket on reassembly; verify opening temperature per spec.	Yanmar Gaskets
Service & maintenance kits	Use at scheduled services	Pre-bundled filters and common consumables for popular Yanmar models.	Yanmar Service & Maintenance Kits

Frequently Used Parts Categories

Routine Service: Yanmar Service & Maintenance Kits
Fuel System: Yanmar Fuel Filters
Cooling System: Water Pumps and Impellers
Air & Intake: Yanmar Air Filters
Exhaust: Yanmar Elbows
Corrosion Protection: Anodes
Electrical/Charging: Alternators

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Overheat alarm or high temperature	Raw-water strainer and intake, impeller condition, belt tension, thermostat operation, coolant level (if freshwater cooled).	Impeller kit, thermostat, heat-exchanger anodes, end-cap gaskets.
Hard starting or rough idle	Fuel quality, water in separator, air leaks on suction side, filter restriction, proper bleeding after service.	Fuel filter elements, fuel hoses/clamps, hand primer (if equipped).
Loss of power under load / black smoke	Air filter restriction, fouled propeller/boat bottom, fuel restriction, exhaust elbow carbon build-up.	Air filter, fuel filters, exhaust mixing elbow, fuel hoses.
White smoke or coolant loss	Coolant leaks, raw-water intrusion, thermostat stuck open (slow warm-up), injector spray quality.	Gaskets/seals, thermostat, injector service, heat exchanger service kit.

FAQs

Are parts interchangeable between GM- and YM-series engines?

Some hardware is similar, but most filters, belts, gaskets, and cooling components are series- and model-specific. Always confirm your exact model code and serial number before ordering.

When should the raw-water impeller be replaced?

As a preventative measure, replace it every 200 hours or annually, and immediately after any dry-run or overheat. Carry a spare onboard.

How often should engine oil be changed?

Typical interval is every 100 hours or annually, whichever comes first. Follow the official Yanmar service schedule for your specific model.

What information do you need to confirm part compatibility?

Please provide the full model code, serial number, cooling type (raw-water vs. freshwater/heat exchanger), and any existing part numbers. Photos of the nameplate and the part youre replacing are also helpful.

Ready to find parts for your Yanmar 4-Stroke 17HP marine engine? Browse the main Yanmar collection by model to filter results and zero in on compatible components.

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If youre unsure about your model, send us a photo of the nameplate and the part you need and well help verify compatibility.