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Evinrude Ocean Pro 150 Specs
| Engine Model: Evinrude Ocean Pro 150 |
| Engine Type: 2-stroke 6-cylinder gasoline outboard engine |
| Total Displacement: 158.2 cu.in (2.6 L) |
| Rated Engine Power: 150 Hp (110 kW) at 5250 rpm |
| Fuel System: Downdraft carburetors |
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| General Technical Data |
The Evinrude Ocean Pro 150 is a two-stroke V6
outboard engine engineered for rigorous saltwater service and commercial
reliability. As part of Evinrude's dedicated marine professional series,
this motor prioritizes robust construction, straightforward mechanics,
and sustained performance in demanding offshore and coastal
environments. It is a carbureted, loop-charged two-stroke, representing
a mature and proven design philosophy that favors serviceability and
durability.
The Ocean Pro 150 delivers its rated power with a strong emphasis on
mid-range torque, making it suitable for pushing heavy loads and
navigating rough seas. Its specifications include heavy-duty corrosion
protection, a high-output charging system, and components selected for
longevity. This engine is recognized as a dependable workhorse for
professional guides, commercial fishermen, and serious offshore boaters.
Engine Designation: Evinrude Ocean Pro 150
Engine Type: Two-stroke, loop-charged scavenging
Cylinder Arrangement: 90-degree V6
Bore: 3.62 inches (92.0 mm)
Stroke: 2.60 inches (66.0 mm)
Displacement: 158.2 cubic inches (2.6 liters)
Compression Ratio: 5.8:1
Rated Power: 150 Hp (110 kW) at 5,250 RPM
Full Throttle Operating Range: 4,850 to 5,850 RPM (specific range varies
with model year and propeller)
Ignition System: Electronic Capacitor Discharge Ignition (CDI) with
electronic timing advance. Utilizes a power pack and trigger assembly.
Starting System: 12-volt electric starter motor with solenoid.
Charging System: High-output 133-amp alternator. Provides a dedicated
50-amp net charge for auxiliary battery systems.
Direction of Rotation: Standard right-hand rotation. Counter-rotation
models are designated with an "R" suffix for dual installations. Gear
Ratio: 2.17:1 (common configuration)
Gear Shift: Hydraulic-mechanical actuation for forward, neutral, and
reverse.
Exhaust System: Through-the-propeller-hub underwater exhaust.
Fuel/Oil Requirement: 87 octane (R+M)/2 unleaded gasoline mixed at a
50:1 ratio with NMMA TC-W3 certified outboard oil. Oil injection systems
were not standard on all Ocean Pro models.
| Cylinder Block |
The cylinder block is a high-strength aluminum alloy casting configured in a 90-degree V6 layout. This vee angle provides excellent primary balance for smooth operation. The block incorporates pressed-in, centrifugally cast iron cylinder liners, offering superior wear resistance and long-term bore integrity in abrasive marine environments.
A forged steel crankshaft rotates within the block, supported by seven main bearings, contributing to the engine's smoothness and durability under load. The block casting is designed with substantial webbing and material thickness to withstand sustained high-load operation. Internal passages facilitate the loop-charging process and coolant circulation.
| Cylinder Head and Valves |
This loop-charged two-stroke engine operates without poppet valves. Gas exchange is managed entirely by piston-controlled port timing. Each cylinder bank is sealed by a single aluminum alloy cylinder head.
The combustion chamber is a machined cavity designed to direct the incoming fuel-air charge in a loop pattern across the cylinder for efficient scavenging of exhaust gases. The head design works in concert with the piston crown shape to optimize this process. Cylinder heads are sealed to the block with reusable metal gaskets and are secured by multiple studs.
| Fuel System |
The fuel system on the Ocean Pro 150 is a carbureted design. It consists of a diaphragm-type fuel pump, a fuel/water separator filter assembly, and six fixed-jet, downdraft carburetors (one per cylinder). Carburetors are mounted on a central intake manifold and are synchronized via a mechanical linkage shaft.
This system requires a pre-mixed fuel and oil combination at a 50:1 ratio. A fuel recirculation system returns excess fuel from the carburetor bowls to the tank to minimize vapor lock. The system is mechanically simple and field-serviceable with standard tools.
| Lubrication System |
The lubrication system on many Ocean Pro 150 models is a conventional pre-mix system. Engine oil is mixed directly with the gasoline in the fuel tank at a 50:1 ratio. This mixture lubricates all internal engine components as it passes through the crankcase and cylinders. Some later models may have been equipped with the VRO (Variable Ratio Oiling) automatic oil injection system.
If present, this system uses a dedicated oil tank and a pump that meters oil into the fuel supply based on engine demand. For pre-mix operation, using a high-quality NMMA TC-W3 certified outboard oil is mandatory for proper lubrication and to prevent piston seizure.
| Cooling System |
The cooling system is a positive-pressure raw water cooling system designed for reliability. A replaceable rubber impeller water pump, located in the gearcase, draws ambient water through large intake screens. Coolant water is forced upward through the driveshaft housing and into the engine block and cylinder heads.
A thermostat regulates engine temperature, maintaining operation within a specified range. A strong visual tell-tale stream provides immediate confirmation of water pump operation. The system includes corrosion-resistant components and is designed to handle extended operation in silt-laden or saltwater conditions.
| Other Systems |
Electrical System: 12-volt negative ground. The system includes the
high-output alternator, a solid-state voltage regulator, a CDI power
pack, and a starter solenoid. Wiring and connectors are selected for
corrosion resistance. Power Trim and Tilt: A robust hydraulic trim and
tilt system is standard. It is operated by a 12-volt electric motor
driving a hydraulic pump, with a manual release valve for emergency
lowering. Exhaust System: Tuned exhaust passages within the mid-section.
Exhaust gases are water-cooled and silenced before being expelled
underwater through the propeller hub.
Gearcase (Lower Unit): A heavy-duty, single-piece aluminum alloy "Ocean
Pro" gearcase. It features reinforced skeletal construction for impact
resistance, and houses a large-diameter driveshaft, stainless steel
propeller shaft, and high-capacity water pump. Lubricant capacity is
approximately 34 fluid ounces (1.0 liter) of high-performance gear oil.
Corrosion Protection: Features include stainless steel fasteners, anodic
protection, and special coatings on critical components to resist
saltwater corrosion.
| Dimensions and Weight |
Dry Weight (Approximate): 418 lbs (190 kg) for a standard 20-inch shaft model with electric start and power trim/tilt. Weight can vary slightly based on specific model year and configuration. Shaft Lengths Available: 20 inches (508 mm) and 25 inches (635 mm) are standard offerings. Overall Dimensions: The 90-degree V6 configuration presents a compact but substantial powerhead. The gearcase and mounting system are robust, reflecting the engine's heavy-duty purpose.
| Maintenance Data |
Spark Plug: Champion QL77JC4 or equivalent. Gap setting: 0.040 inches
(1.0 mm). Replace every 100 operating hours or annually.
Fuel Filter (Water Separator): Drain water weekly. Replace the filter
element every 100 operating hours or at least once per season.
Water Pump Impeller: Replace the complete water pump kit every year or
100 operating hours in severe service. In normal use, replace every two
years.
Gearcase Lubricant: Drain and refill with new gear oil every 100
operating hours or at least once per season. Inspect lubricant for water
contamination (milky appearance) or metal particles.
Link and Sync: The procedure to synchronize carburetor throttle opening
with ignition timing advance is required during reassembly or if rough
running is observed. Perform annually.
Carburetor Cleaning: Disassemble and clean carburetors every 200-300
hours to prevent clogging from fuel varnish or debris.
Anode Inspection: Inspect and replace all sacrificial zinc anodes every
50 hours in saltwater or when 50% eroded.
| Tightening Torques |
Cylinder Head Nuts: 20-22 lb-ft (27-30 Nm). Tighten in the specified
crisscross sequence in three progressive steps. Spark Plugs: 15 lb-ft
(20 Nm).
Flywheel Nut: 90-105 lb-ft (122-142 Nm). Requires a crankshaft locking
tool for proper installation.
Main Bearing Cap Bolts: 22-24 lb-ft (30-33 Nm).
Connecting Rod Cap Nuts: 17-19 lb-ft (23-26 Nm). Always install new
locking inserts or cotter pins.
Gearcase Drain/Fill Screws: 60-80 lb-in (6.8-9.0 Nm).
Propeller Nut: 55 lb-ft (75 Nm). Secure with a new cotter pin.
Engine Mount (Swivel Bracket) Nuts: 55 lb-ft (75 Nm).
Carburetor Mounting Nuts: 60-80 lb-in (6.8-9.0 Nm).
| Boat Applications |
The Evinrude Ocean Pro 150 is engineered for demanding applications
where reliability is paramount. Primary Power: An effective single
engine for heavier hulls from 18 feet to 22 feet, including walkaround
cabins and center consoles. Twin Installation: Extensively used in twin
configurations on offshore fishing boats, commercial charter vessels,
and patrol boats from 22 feet to 28 feet. Boat Types: Offshore center
console fishing boats, coastal bay boats, commercial fishing skiffs,
rigid inflatable boats (RIBs), aluminum deep-V workboats, and
government/military craft.
Common Hull Brands: This engine was a preferred choice for professional
operators and was frequently specified on hulls from manufacturers such
as Boston Whaler, Grady-White, Pursuit, and Hewes, as well as on many
commercial and custom boatbuilder hulls. Its reputation for toughness
and simple maintenance made it a staple in the commercial fishing and
charter fleet for many years.
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