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Evinrude E-TEC 40 Specifications
| Engine Model: Evinrude E-TEC 40 Hp |
| Engine Type: 2-stroke 2-cylinder gasoline outboard engine |
| Total Displacement: 52.7 cu.in (0.87 L) |
| Rated Engine Power: 40 Hp (29 kW) at 5500 rpm |
| Fuel System: Direct fuel injection |
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| General Technical Data |
The Evinrude E-TEC 40 is a compact,
technologically advanced two-stroke outboard engine that brings direct
injection efficiency and performance to the mid-power segment. As a
two-cylinder E-TEC model, it represents a sophisticated alternative to
conventional carbureted and four-stroke engines in its class. The engine
delivers 40 Hp through a refined combustion process that eliminates raw
fuel wash and short-circuiting common in older two-stroke designs.
It is engineered for smooth, quiet operation with immediate throttle
response and strong low-end torque. Available in both electric start
remote and tiller configurations, the E-TEC 40 is recognized for its
lightweight design, extended maintenance intervals, and clean emissions
profile. This engine serves as a versatile and reliable power source for
a wide range of small to medium-sized vessels.
Engine Designation: Evinrude E-TEC 40
Engine Type: Two-stroke, E-TEC Direct Fuel Injection
Cylinder Arrangement: Inline 2-cylinder
Bore: 3.62 inches (92.0 mm)
Stroke: 2.60 inches (66.0 mm)
Displacement: 52.7 cubic inches (0.868 liters)
Compression Ratio: 6.1:1
Rated Power: 40 Hp (29 kW) at 5,500 RPM
Full Throttle Operating Range: 5,500 to 6,000 RPM
Ignition System: Fully electronic capacitor discharge ignition (CDI)
integrated within the Engine Control Module (ECM).
Starting System: Available in 12-volt electric start configuration or
manual rope start. Electric start models include a solenoid and a
dedicated starter motor.
Charging System: High-output 81-amp alternator. Provides a 25-amp net
dedicated charge for auxiliary battery systems.
Direction of Rotation: Standard right-hand rotation (clockwise when
viewed from above).
Gear Ratio: 2.00:1
Gear Shift: Manual shift via a mechanical cable linkage (remote models)
or integrated tiller handle.
Exhaust System: Through-the-propeller-hub underwater exhaust.
Fuel Requirement: 87 octane (R+M)/2 unleaded gasoline.
Emissions Certification: Meets U.S. EPA and European Union recreational
marine emissions standards.
| Cylinder Block |
The cylinder block is a single aluminum alloy casting configured as an inline two-cylinder powerhead. This monoblock design provides structural integrity and simplifies manufacturing. The block incorporates cylinder bores finished with a hardened composite material, providing a durable wear surface without the use of traditional iron liners.
A forged steel crankshaft rotates within the block, supported by three main bearings. The casting includes internal transfer passages that route the incoming air charge from the crankcase to the cylinders. Mounting bosses for the intake manifold, oil injection components, and external accessories are integral to the block structure.
| Cylinder Head and Valves |
This E-TEC direct injection two-stroke engine operates without conventional poppet valves. Gas exchange is controlled exclusively by piston-port timing. A single aluminum alloy cylinder head assembly seals both cylinders to the block. The combustion chamber for each cylinder is a machined cavity designed to promote efficient swirl and complete combustion of the directly injected fuel charge.
The head design works in conjunction with the porting to facilitate effective loop scavenging, where fresh charge enters and exhaust exits via ports on opposite sides of the cylinder. The head contains threaded inserts for the spark plugs and direct fuel injectors.
| Fuel System |
The fuel system is the E-TEC high-pressure direct injection system. It consists of an electric lift pump, a mechanical high-pressure fuel pump driven by the crankshaft, a fuel rail, and individual solenoid-controlled injectors for each cylinder. Fuel is injected directly into the combustion chamber at precise pressures and timings controlled by the ECM.
The system employs a stratified charge strategy at low RPM and idle, creating a rich, ignitable air-fuel mixture near the spark plug within a lean overall cylinder charge. This approach maximizes fuel efficiency and minimizes emissions during trolling and low-speed operation. At higher RPM, the system transitions to a homogeneous charge for maximum power output.
| Lubrication System |
The lubrication system is a multi-point targeted oiling system. A positive-displacement oil pump, driven from the crankshaft, supplies 100% synthetic Evinrude XD100 oil to specific critical engine bearings. These lubrication points include the crankshaft main bearings, connecting rod big-end bearings, and piston pin bearings. Oil is not pre-mixed with the fuel.
Cylinder wall lubrication is achieved through a separate, precisely metered oil delivery circuit. The electronic control module modulates the oil pump output based on real-time engine operating parameters including load, RPM, and temperature. This targeted approach ensures optimal component protection with minimal oil consumption and produces no visible smoke.
| Cooling System |
0The engine utilizes a standard raw water cooling system. A rubber impeller water pump, mounted in the gearcase housing, draws ambient water through the intake screens. This coolant water is circulated under pressure through passages in the cylinder block, cylinder head, and exhaust manifold.
A thermostat regulates engine temperature, maintaining optimal operating conditions. A visual tell-tale stream provides continuous confirmation of adequate water pump operation. The cooling system is designed for reliability and effective heat dissipation across the engine's operating range.
| Other Systems |
Electrical System: 12-volt negative ground architecture. The system is
managed by an Engine Control Module (ECM) that monitors sensors and
controls ignition, fuel injection, and oil injection. Wiring harnesses
utilize sealed connectors for corrosion resistance. Steering: Configured
for standard remote steering via mechanical cable or as a tiller-steer
model with an integrated handle containing throttle, shift, and
emergency stop functions.
Trim and Tilt: Available in manual tilt or power trim and tilt
configurations. Power trim models feature a self-contained hydraulic
system operated by a 12-volt electric motor. Gearcase (Lower Unit): A
durable aluminum alloy gearcase houses the driveshaft, propeller shaft,
forward/neutral/reverse gears, and the water pump. It is filled with
synthetic gearcase lubricant. Diagnostics: Basic diagnostic fault codes
are accessible through a sequence of warning light flashes on the tiller
handle or remote control panel. More advanced diagnostics require
proprietary software.
| Dimensions and Weight |
Dry Weight (Approximate): Ranges from 232 lbs (105 kg) for a manual start, manual tilt model to 250 lbs (113 kg) for an electric start model with power trim and tilt. Shaft Length: 20 inches (508 mm) is the standard and primary offering. Overall Dimensions: The inline two-cylinder configuration results in a narrow powerhead profile, contributing to the engine's compact and lightweight character. This design facilitates easy handling and installation on a variety of transoms.
| Maintenance Data |
Scheduled Maintenance: The E-TEC system extends service intervals
substantially. Recommended inspections occur at 300-hour or annual
intervals.
Spark Plugs: Use specified E-TEC surface-gap spark plugs. Replacement
interval is extended, generally recommended at 300-hour intervals.
Fuel Filter: An inline water-separating fuel filter is installed. This
filter requires periodic inspection and replacement as indicated by
service intervals or symptoms of fuel restriction.
Water Pump Impeller: The water pump impeller should be inspected and
replaced every three years or 300 hours of operation.
Gearcase Lubricant: Drain and refill the gearcase lubricant annually or
every 100 hours of operation.
Oil Injection System: Ensure the remote oil tank is filled with Evinrude
XD100 synthetic oil. The system is self-priming. Oil line and filter
inspection is advised during annual service.
Anode Inspection: Inspect and replace the sacrificial anode located on
the lower unit to protect against galvanic corrosion.
| Tightening Torques |
Cylinder Head Bolts: 24 lb-ft (33 Nm). Follow the manufacturer's
specified crisscross tightening sequence in two or three progressive
steps.
Spark Plugs: 15 lb-ft (20 Nm).
Flywheel Nut: 58 lb-ft (79 Nm). A crankshaft locking tool is required
for proper installation.
Main Bearing Cap Bolts: 22 lb-ft (30 Nm).
Connecting Rod Cap Nuts: 17 lb-ft (23 Nm). These fasteners often utilize
a locking tab or insert; follow proper reassembly procedure.
Gearcase Drain/Fill Screws: 50 lb-in (5.6 Nm).
Propeller Nut: 45 lb-ft (61 Nm). Secure with a new cotter pin.
Engine Mount (Clamp Bracket) Bolts: 40 lb-ft (54 Nm).
| Boat Applications |
The Evinrude E-TEC 40 HP is a highly versatile engine suited for a
diverse array of small craft where a balance of power, weight, and
efficiency is paramount. Primary Power: An ideal single engine for boats
from 14 feet to 18 feet in length. Twin Installation: Used in twin
configurations on larger pontoons and commercial workboats where
redundancy and maneuverability are required.
Boat Types: Aluminum fishing boats and jon boats, fiberglass skiffs and
center consoles, inflatable boats and rigid inflatable boats (RIBs),
pontoon boats, and utility dinghies. Common Hull Brands: This engine is
a popular choice for independent boat builders and as a dealer-installed
option on a wide range of hulls. It is commonly paired with brands such
as Lund, Alumacraft, G3, and Crestliner for aluminum boats, and Zodiac,
AB, and Highfield for inflatables. Its lightweight and direct injection
performance make it a favored powerplant for guides and recreational
anglers.
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