Tohatsu 4-Stroke 45HP Outboard Engine Parts

(5 products)

This page is dedicated to Tohatsu 4‑Stroke 45 HP outboard engines. Use it to find compatible parts, routine service information, maintenance tips, commonly replaced items, and quick troubleshooting guidance. You can also browse the main Tohatsu collection at any time. Scroll to the bottom of this page to start browsing parts specific to this engine, and remember that on the collection page you can use the “Filter & Sort” controls to narrow results by horsepower, year range, and part category.

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How to Identify Your 45 HP Model

Check the nameplate/serial sticker on the transom bracket or swivel bracket. It lists model identification and serial number.
Model codes typically include power rating and suffix letters. Suffixes indicate shaft length (S/L/UL), start/charging options, and control type (tiller vs. remote).
For 4‑stroke models in this class, many markets use a shared platform with 40/50/60 hp variants; the exact calibration may define a 45 hp rating. Confirm via serial plate when ordering parts.
Measure shaft length (approx. 15, 20, or 25 inches) and note features like power trim/tilt and remote control, as these affect parts compatibility.

Engine Overview

Mid‑Range EFI Four‑Stroke Platform

Feature	Description
Configuration	Inline‑3 EFI 4‑stroke, within the 40–60 hp family; tuned for a 45 hp output in some markets.
Common Models	Often shares components with 40/50/60 hp EFI three‑cylinder Tohatsu four‑strokes; verify with serial plate for exact variant.
Advantages	Good fuel economy, smooth mid‑range torque, relatively light weight and straightforward routine service.
Notes	Many wear components (impeller, filters, plugs, anodes) interchange across sibling hp ratings. Always confirm shaft length and control type before ordering.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow the official service manual and your local operating conditions.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	First 20 hours, then every 100 hours or annually	Warm engine before draining; replace crush washer if applicable.	Oil Filters
Gear oil (lower unit)	Every 100 hours or annually	Inspect for metal, water intrusion; replace drain screw gaskets.	Tohatsu Lower Unit Seal Kits
Spark plugs	Inspect every 100 hours; replace 200 hours or as needed	Use correct heat range and gap; replace if fouled or worn.	Spark Plugs
Fuel filter / water separator	Inspect every 50–100 hours; replace annually or when restricted	Drain water if serviceable; replace sooner with ethanol or dirty fuel.	Fuel Filters
Water pump impeller / kit	Every 2–3 seasons (annually in sandy/silty water)	Replace housing and key as needed; confirm tell‑tale flow.	Tohatsu Water Pump Repair Kits
Anodes (internal & external)	Inspect every 50 hours; replace when 50% consumed	Match alloy to water type (salt, brackish, fresh) and keep paint off anodes.	Anodes

Frequently Used Parts Categories

Routine Service: Tohatsu Outboard Parts
Cooling System: Tohatsu Water Pump Repair Kits
Fuel System: Fuel Filters and Fuel Pumps
Ignition / Electrical: Spark Plugs, Starters, Electrical Items
Gearcase & Seals: Tohatsu Lower Unit Seal Kits
Propulsion: Propellers and Propeller Guards
Corrosion Protection: Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens for debris, verify water pump impeller condition, and thermostat operation.	Water pump kit, thermostat, intake screens, anodes
Poor acceleration or power loss	Confirm fresh fuel, inspect fuel filter and venting, check spark plugs and propeller condition/pitch.	Fuel filter, spark plugs, propeller, fuel pump
Hard starting or rough idle	Verify battery voltage and connections, inspect plugs, check for stale fuel or water in fuel.	Spark plugs, fuel filter, starter/battery cables
Gearcase noise or metal in gear oil	Drain and inspect gear oil; check for water intrusion at prop shaft or drive shaft seals; verify prop hub.	Lower unit seal kit, bearings, propeller hub, drain screw gaskets

FAQs

Are parts interchangeable between 40/45/50 hp Tohatsu four‑strokes?

Many routine service items (impellers, filters, plugs, anodes) are shared across the 40–60 hp inline‑3 EFI platform. However, confirm with your model/serial, shaft length, and control type to ensure proper fit.

When should I replace the water pump impeller?

As a rule of thumb, replace every 2–3 seasons, or annually if operating in sandy/silty shallows or if the tell‑tale stream weakens. Replace the full kit when wear is noted.

How often should I change lower unit gear oil?

Change at least annually or every 100 hours. If the drained oil appears milky (water intrusion) or metallic, service seals and inspect internal components before further use.

What information helps confirm part compatibility?

Provide the model and serial number from the nameplate, shaft length (S/L/UL), control type (tiller or remote), and any notable features (electric start, power trim/tilt). Photos of the nameplate and the part needing replacement are very helpful.

Ready to find parts? Browse the main Tohatsu collection and use the Filter & Sort tools to narrow by horsepower, year, and model.

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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.