Yanmar 76HP 4-Stroke Marine Engine Parts

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This page is for Yanmar 4-Stroke 76HP outboard engines. It helps you find compatible parts and practical service information, including maintenance tips, common replacement 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, 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 76HP Model

Nameplate/serial plate: Look on the engine block side cover or upper mount area; on some installations the plate may also be on a bracket near the flywheel housing or transom bracket.
Model code and suffix: Yanmar codes such as 3TNV76 may appear on the compliance or parts label. Suffix letters/numbers often indicate specification updates (cooling, governor setup, mount type) and build year range.
Platform clues: A 4-stroke diesel with a mechanical injection pump and glow plugs is typical of the 3TNV76-based platform. Later variants with additional sensors/ECU will have more wiring and a common-rail rail/pressure sensor.
Shaft/installation details: For propulsion setups, note shaft length/gearcase type and control style (tiller/remote) as these affect propeller and some rigging components.

Engine Overview

Inline-3 4‑Stroke Diesel (3TNV76-based)

Feature	Description
Configuration	Inline-3, naturally aspirated 4-stroke diesel, mechanical fuel injection, raw-water cooled via impeller pump and heat exchanger
Common Models	3TNV76 family (e.g., 3TNV76-GMA) used in various marine/industrial adaptations around the 76 HP class
Advantages	Compact package, strong low‑RPM torque, good fuel economy, straightforward mechanical service
Notes	Confirm parts by engine serial/spec plate. Cooling, governor, and mounting variations can change gasket sets, pump covers, and belt lengths.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical usage. Always follow the official Yanmar service manual for your exact model and duty cycle.

Item	Interval*	Remarks	Parts Link
Engine oil & filter	Every 100 hours or annually	Use marine‑grade diesel oil; replace the oil filter at each oil change	Yanmar Oil filters
Fuel filter(s)	Every 200 hours or each season	Replace primary and secondary elements; bleed air after service	Yanmar Fuel filters
Raw‑water pump impeller	100–200 hours or 1–2 seasons	Shorten interval for sandy/silty water or high idling	Water pumps
Anodes (zinc/aluminum/magnesium)	Inspect every 50 hours; replace when 50% depleted	Match anode material to water type (salt/brackish/fresh)	Anodes
Gear oil (lower unit/saildrive)	Every 100 hours or annually	Check for water intrusion; reseal if milky oil is found	Lower Unit Seal Kits
Air filter	Every 200 hours (inspect more often in dusty conditions)	Replace if contaminated or after cleaning limits are reached	Yanmar Air filters
Drive/alternator belt	Inspect every 100 hours; replace 200–300 hours	Retension after initial run‑in; replace if cracked or glazed	Belt
Glow plugs (diesel)	Test every 200 hours or with cold start issues	Verify relay/timer function and battery voltage	Yanmar

Frequently Used Parts Categories

Routine Service — Yanmar Service & Maintenance Kits
Fuel System — Yanmar Fuel filters
Cooling System — Water pumps
Filtration (Air/Oil) — Yanmar Air filters | Yanmar Oil filters
Ignition / Electrical (Starting & Charging) — Starters | Alternators
Gaskets & Sealing — Yanmar Gaskets
Exhaust & Turbo — Yanmar Elbows | Yanmar Turbos

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale or overheat alarm	Inspect intake screens, raw‑water strainer, and impeller; verify thermostat operation	Water pump impeller/kit, pump cover, thermostat, intake screen
Hard starting when cold	Test glow plugs and relay; confirm battery voltage and fuel system is primed/no air	Glow plugs, glow relay/timer, battery, fuel filter, lift/primer pump
Poor acceleration or power loss	Replace fuel filters; check for air filter restriction and fouled prop; verify throttle/governor linkage	Fuel filters, air filter, injectors (service), propeller, governor linkage parts
Gearcase/drive noise or milky gear oil	Drain and inspect oil for water/metal; pressure test and reseal	Lower unit seal kit, bearings, shims, gear set
Low charging voltage or belt squeal	Check belt tension/condition and alternator output; inspect connections	Belt, alternator, regulator/rectifier, terminals

FAQs

Are parts interchangeable between different years or platform variants?

Some service parts (filters, belts, impellers) overlap across 3TNV76 variants, but many items depend on the exact specification and suffix. Always match by model code, serial number, and spec label before ordering.

When should I replace the raw‑water impeller?

In normal conditions, annually or every 100–200 hours—whichever comes first. Replace sooner if operating in sandy/silty water, or if telltale flow weakens.

How often should gear oil be changed?

As a rule of thumb, every 100 hours or annually. Inspect sooner after any impact or if you notice water contamination (milky oil) or metal particles.

What information do you need to confirm part compatibility?

Provide the engine model code (e.g., 3TNV76‑xxx), full serial number, any specification/suffix codes, and details about your installation (control type, shaft/drive). Photos of the nameplate and the part needing replacement are very 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.