Yanmar 22HP 4-Stroke Marine Engine

(0 products)

This page is for Yanmar 4-Stroke 22HP outboard engines. It helps you find compatible parts and essential service information, with maintenance tips, commonly replaced items, and troubleshooting guidance. You can also browse the main Yanmar collection. Scroll to the bottom of this 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.

Browse All Yanmar Parts

How to Identify Your 22HP Model

Nameplate location: look for the riveted ID/serial plate on the engine block or rocker cover; some installations also include a tag on the transmission or mounting bracket. On transom-mounted units, the tag is typically on the clamp bracket.
Reading the code: Yanmar model strings often include the series (e.g., GM, YM) and cooling designation (e.g., “F” for freshwater/heat-exchanger cooled). Suffix letters can indicate configuration details. Record the full model and serial to confirm parts.
Platform cues: compact 4-stroke diesels in this HP range may be inline-2 or inline-3. Older GM-series are known for simple indirect injection; newer YM-series run smoother and quieter.
4-stroke diesel specifics: no spark plugs; expect a mechanical or electric lift pump, injector lines, and a raw-water pump feeding a heat exchanger on freshwater-cooled models.

Engine Overview

Small GM-Series Diesels (examples around this class)

Feature	Description
Configuration	Inline-2 or inline-3, indirect-injection 4-stroke diesel; raw-water impeller feeding heat exchanger on freshwater-cooled “F” variants.
Common Models	Examples include 2GM20F and 3GM30F near this output class.
Advantages	Rugged, simple, and widely supported; tolerant of marine conditions; easy to service with basic tools.
Notes	Exhaust elbows are a maintenance focus due to internal corrosion and carbon buildup. Air cleaner foam elements can deteriorate with oil exposure—inspect regularly.

Newer YM-Series Diesels (examples around this class)

Feature	Description
Configuration	Inline-2 or inline-3 4-stroke diesel with improved combustion and smoother operation; raw-water impeller with heat exchanger on most installations.
Common Models	Examples include 2YM20 and 3YM20 around the 20–22 HP range.
Advantages	Quieter running, good fuel efficiency, strong parts availability.
Notes	Service intervals are similar to GM-series. Continue periodic checks of the mixing elbow and raw-water impeller.

Routine Maintenance & Service Parts

Intervals below are general guidelines for compact 4-stroke marine diesels in this HP class. Always follow the maintenance schedule and specifications in your official Yanmar service manual.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	Every 100 hours or annually	Use marine-grade diesel oil; replace spin-on filter each change.	Yanmar Oil Filters
Fuel filter(s)	100–200 hours or each season	Replace engine-mounted element; service primary/water-separating filter and drain water.	Yanmar Fuel Filters
Air filter/cleaner	Inspect every 100 hours	Check for deteriorated foam; clean/replace to prevent ingestion and wear.	Yanmar Air Filters
Raw-water impeller	1 year or 200 hours	Replace impeller; inspect cover plate and cam for scoring.	Impellers
Thermostat & gaskets	Every 2–3 years	Test opening temp; renew gasket when serviced.	Yanmar Gaskets
Anodes (where fitted)	Inspect 3–6 months	Check exchanger, saildrive/gearbox, and bonding system; replace when 50% consumed.	Anodes
Transmission/Saildrive oil	100–200 hours or annually	Change oil; inspect magnetic drain plug for metal fines.	Yanmar Service & Maintenance Kits
Exhaust mixing elbow	Inspect every 1–2 years	Check for internal corrosion or carbon clogging; replace if restricted or leaking.	Yanmar Elbows
Drive/alternator belt	Inspect every 100 hours	Check tension and cracking; replace if glazed or frayed.	Belts

*Intervals are typical for this class; confirm requirements for your exact model and duty cycle.

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak water stream or overheat alarm	Inspect intake screen/strainer, raw-water impeller, hoses, and thermostat; check for blocked mixing elbow.	Water pump impeller kit, thermostat, hoses, mixing elbow.
Hard starting or rough idle	Confirm clean fuel, bleed air from lines, replace fuel filters; check cold-start aids where equipped and injector condition.	Fuel filters, lift pump, injectors, air filter.
Poor acceleration or power loss	Look for clogged air filter, restricted exhaust elbow, fouled fuel filters, or prop/drive fouling.	Air filter, fuel filter, exhaust elbow.
Excessive smoke under load	Black: air restriction or over-propped; White: cold combustion/air in fuel; Blue: oil consumption. Inspect filters, timing, and injectors.	Air filter, injectors, fuel filter, crankcase ventilation service.
Gearbox noise or metal on drain plug	Verify oil level/condition, alignment, and mount integrity; service on schedule.	Gear oil, seals/gaskets, engine mounts.

FAQs

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

Some service items look similar but differ in size or thread (filters, belts, elbows). Always match parts using the full model designation and serial number to ensure compatibility.

When should I replace the raw-water impeller?

Annually or every 200 hours is a common guideline. Replace sooner if the tell-tale weakens, the pump ingested debris, or the engine overheated.

How often should transmission or saildrive oil be changed?

Typically every 100–200 hours or annually. Inspect for water intrusion and check the magnetic drain plug for metal fines at each service.

What information do I need to confirm part compatibility?

Provide the full Yanmar model code, serial number, cooling type (raw-water vs. freshwater/heat exchanger), and photos of the nameplate and the part you’re replacing.

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

Browse All Yanmar Parts

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.