Mercury Mariner XR4 Outboard lower unit

This listing is for one professionally reconditioned Mercury Mariner XR4 Outboard Lower Unit for 150HP engines. Originally manufactured under part number 1655-9572A3, this gear case has been completely disassembled, meticulously cleaned, inspected, and rebuilt with all-new internal seals and a brand-new impeller. It has undergone a rigorous pressure test and successfully held 18 PSI, ensuring it’s leak-free and ready for performance.

With a 4-1/4″ gear case bullet, 8-spline drive shaft, and 15-spline propeller shaft, this lower unit is built for precision and reliability. The driveshaft measures approximately 23 1/2″ from the top to the base of the water pump, matching standard XR4 specifications. Buy Mercury Mariner XR4 Outboard lower unit Online.

You will receive exactly the unit pictured—no surprises, just reliable performance.

Features

✅ Reconditioned Mercury XR4 Lower Unit for 150HP outboards
✅ Complete internal inspection and cleaning
✅ All-new seals and a new impeller installed
✅ Pressure-tested to 18 PSI for reliability
✅ 14-tooth pinion gear / 25-tooth forward & reverse gear
✅ OEM-fit bullet: 4-1/4″ diameter
✅ Exact match to part number 1655-9572A3
✅ Ships fully assembled and ready for installation

Mercury Mariner XR4 Outboard lower unit Specifications

• Brand: Mercury / Mariner

• Condition: Re-manufactured

• Horsepower: 150 HP

• Drive Shaft Spline Count: 8

• Prop Shaft Spline Count: 15

• Driveshaft Length: ~23.5″ (top to base of water pump)

• Gear Case Bullet Diameter: 4 1/4″

• Pinion Gear Teeth: 14T

• Forward/Reverse Gear Teeth: 25T

• OEM Part Number: 1655-9572A3

• Casting Number: 1655-9572-C

• Related Part Numbers: 1674-814247T3, 1674-814247A3

• SKU: GB649092552

Benefits

🔧 Restored to OEM Specs – Reliable performance at a fraction of the cost of a new lower unit
🌊 Ready to Install – No need to source parts or rebuild it yourself
⚙️ Durability Tested – Passed 18 PSI pressure test for peace of mind
🚤 Perfect Fit – Built to match Mercury Mariner XR4 150HP models exactly
💰 Cost-Effective Solution – Reconditioned with new components to maximize value

FAQs

Q: Will this fit my Mercury XR4 150HP outboard?
A: Yes, if your engine matches the OEM part number 1655-9572A3 or compatible numbers 1674-814247T3 and 1674-814247A3. If unsure, contact us with your serial number.

Q: Is this a new or used part?
A: This is a re-manufactured unit—cleaned, inspected, rebuilt, and fitted with new internal seals and impeller.

Q: Is the unit pressure-tested?
A: Yes, it has been pressure-tested to 18 PSI to ensure there are no leaks or cracks.

Q: Does it come ready to install?
A: Yes, the unit is fully assembled and ready for immediate installation upon arrival.

Q: Can I see the exact unit I’ll receive?
A: Yes. The photos show the exact lower unit you will get.