0433571 Johnson 20" Gearbox Complete | Genuine Used Part

🔧 Product Description

Genuine Johnson Evinrude 40HP-60HP 20-Inch Gearcase Assembly - Part Number: 0433571

A genuine OMC / BRP 20-inch lower unit for selected two-cylinder and three-cylinder loopcharged outboards.

Depending on the catalogue, 0433571 may identify the complete gearcase or the principal housing used in the complete assembly. This listing is for the supplied complete used gearbox built around the 0433571 gearcase.

⚙️ Key Features

• Genuine OMC / BRP gearcase
• Correct reference 0433571 / 433571
• 20-inch long-shaft configuration
• Used on selected 40HP-60HP loopcharged engines
• Mechanical shift and through-prop exhaust
• Common 14-spline driveshaft / 13-spline propeller-shaft family

🚤 Compatibility

Documented on selected approximately 1976-1988

• Johnson / Evinrude 40HP
• 45HP commercial applications
• 48HP and 50HP
• 55HP and 60HP
• Two-cylinder loopcharged 40HP-60HP engines
• Selected three-cylinder applications where the same housing, spline and ratio are specified
• 1987 50HP model families using related 20-inch gearcase diagrams
• Shaft Length: 20 inch
• Common Driveshaft Configuration: 14 spline
• Common Propeller-Shaft Configuration: 13 spline
• Fitment Requirement: Confirm housing size, gear ratio, spline count and complete model number

🔌 Function

The gearcase contains the reduction gears and clutch dog that transfer power to the propeller and select forward, neutral or reverse.

⚠️ Common Signs of Failure

• Unit jumps out of gear
• Gear oil is milky or metallic
• Propeller shaft is bent
• Driveshaft splines are worn
• Shift rod is incorrectly adjusted
• Carrier or pinion bearings are noisy

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 0387107 related earlier gearcase
• 0388475 / 388475 related earlier or service assembly
• 0396939 / 396939 related gearcase reference
• 0433571 later obsolete BRP gearcase reference
• Exact supersession varies by horsepower, year and housing size

OEM / Related Numbers

• 0433571
• 433571
• 0396939
• 396939
• 0387107
• 0388822
• 388822
• 0388475
• 388475
• Related long driveshaft, shift rod and water-pump assembly

Aftermarket / Verified Equivalents

• Specialist remanufactured 0433571 lower unit
• Rebuilt 40HP-60HP OMC long-shaft gearcase
• Sierra and GLM water-pump, seal and bearing kits for the applicable 1975-1988 loopcharged gearcase
• GLM 87603 related seal kit for compatible small-housing applications
• No verified current new complete aftermarket unit

📦 Condition

• Genuine used complete gearbox
• Built around the 0433571 gearcase
• Removed from running engine where applicable
• In good working condition unless otherwise stated
• Pressure and vacuum testing is recommended