Mercury 15" Short Shaft Lower Unit | Fits 1972–1977 Mercury 65HP 3-Cylinder Outboards | 1 Year Warranty

Product Overview

Replace your worn or damaged gearcase with this genuine OEM Mercury 15" Short Shaft Lower Unit, designed for 1972–1977 Mercury 65HP 3-cylinder outboard engines. This factory lower unit has been professionally inspected, fully resealed, pressure tested, and fitted with a new water pump impeller to deliver reliable performance and long service life. Every unit is opened and thoroughly inspected, with gears replaced only if necessary—good OEM gears are retained to maintain factory performance and durability. The driveshaft and propshaft have also been checked for straightness, making this an excellent replacement for your original Mercury lower unit. Whether you're restoring a classic Mercury outboard or replacing a damaged gearcase, this genuine OEM lower unit offers dependable factory fit and performance.

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Key Features

• Genuine OEM Mercury Short Shaft Lower Unit
• Fits 1972–1977 Mercury 65HP 3-cylinder outboards
• 15" short shaft configuration
• Fully resealed
• Pressure tested to 12 PSI
• New water pump impeller installed
• Driveshaft and propshaft checked for straightness
• Professionally inspected
• Ready to install
• 1-year working warranty included

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Technical Specifications

Specification	Details
Brand	Mercury
Product Type	Complete Lower Unit
Condition	Used – Professionally Serviced
Shaft Length	15" Short
Driveshaft Length	17-3/4" (measured from the top of the water pump)
Engine Configuration	3-Cylinder
Horsepower	65 HP

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Compatible Applications

Designed for select Mercury outboards including: Model Years

• 1972
• 1973
• 1974
• 1975
• 1976
• 1977

Horsepower

• 65 HP

Engine Configuration

• 3-Cylinder

Shaft Length

• 15" Short Shaft

Important: Always verify compatibility using your engine's model and serial number before purchasing. If you need assistance confirming fitment, contact EZ Boats Marine and we'll be happy to help.

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Condition

This Mercury 15" Short Shaft Lower Unit has been professionally serviced and is in good used condition. Inspection highlights include:

• Fully resealed
• Pressure tested to 12 PSI
• New water pump impeller installed
• Driveshaft and propshaft checked for straightness
• Opened and internally inspected
• Good OEM gears retained unless replacement was required
• Ready for installation
• Gear oil is not included and must be added before use

Please review all product photos carefully to evaluate the cosmetic condition before purchasing.

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What's Included

Your purchase includes:

• OEM Mercury 15" Short Shaft Complete Lower Unit

Only the components shown in the product photos are included.

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Shipping Information

Your lower unit will be professionally packaged to help prevent shipping damage during transit. We offer fast shipping throughout the United States, with international shipping available upon request. For an accurate shipping quote, please provide:

• Country
• ZIP or Postal Code
• Residential or Commercial Address
• Whether liftgate service is required

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Why Buy from EZ Boats Marine?

• Genuine OEM Mercury Marine Parts
• Professionally Inspected Components
• Factory Fit and Finish
• Fully Resealed and Pressure Tested
• Honest Condition Descriptions
• Fast Nationwide & International Shipping
• Secure Packaging
• Experienced Marine Parts Specialists
• Dedicated Customer Support

EZ Boats Marine is committed to supplying quality OEM marine parts backed by expert service and dependable support.

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Frequently Asked Questions

Is this a genuine Mercury lower unit?

Yes. This is an original OEM Mercury lower unit professionally inspected and serviced for reliable operation.

What condition is it in?

The lower unit is in good used condition. It has been fully resealed, pressure tested to 12 PSI, internally inspected, fitted with a new water pump impeller, and the driveshaft and propshaft have been checked for straightness.

Which engines does it fit?

This lower unit fits select 1972–1977 Mercury 65HP 3-cylinder outboards equipped with a 15-inch short shaft. Always verify compatibility using your engine's model and serial number before ordering.

Is it ready to install?

Yes. The lower unit is ready for installation. Gear oil must be added before operation, as it is shipped without lubricant.

What does the warranty cover?

This lower unit includes a 1-year working warranty covering failures under normal recreational use.

Can EZ Boats Marine verify fitment?

Absolutely. Simply send us your Mercury engine's model and serial number, and we'll confirm whether this OEM 15" Short Shaft Lower Unit is the correct fit before you purchase.