5121600LP 5121600TP Mercruiser Alpha Gen 2 Complete Sterndrive 2.00:1 Standard Rotation | Genuine Used Part

🔧 Product Description

Genuine MerCruiser Alpha One Gen II Complete Sterndrive - Part Number: 5121600TP

A genuine MerCruiser Alpha One Gen II complete sterndrive with a 2.00:1 reduction ratio and standard right-hand propeller rotation.

The 2.00 ratio is primarily used with MerCruiser 2.5L and 3.0L four-cylinder petrol engines, providing the deeper reduction required for the engine's operating range and propeller loading.

⚙️ Key Features

• Genuine MerCruiser Alpha One Gen II complete drive
• Current part number 5121600TP
• Supersedes original 5121600LP configuration
• 2.00:1 ratio with standard rotation
• Complete upper and lower sterndrive assembly

🚤 Compatibility

Commonly used on

• MerCruiser Alpha One Gen II four-cylinder sterndrive packages

Typically suits

• Engine models:
• MerCruiser 2.5L 120HP
• MerCruiser 3.0L 130HP
• MerCruiser 3.0LX
• MerCruiser 3.0L 135HP
• MerCruiser 3.0L 140HP
• Alpha One Gen II serial ranges beginning at 0D469859
• 1998-and-newer replacement applications from serial 0L100040 and above
• HP Range: Approximately 120HP - 140HP
• Engine Type: MerCruiser inline-four petrol sterndrive engine
• Drive Type: Alpha One Gen II standard rotation
• Gear Ratio: 2.00:1
• Year Range: 1991 onward, dependent on serial number

🔌 Function

The drive transmits engine power to the propeller, provides forward and reverse gear selection, supplies cooling water to the engine and allows steering, trim and trailering movement.

⚠️ Common Signs of Failure

• Water-contaminated or metallic gear lubricant
• Grinding, whining or rumbling from the upper or lower gears
• Difficult or incomplete gear engagement
• Excessive universal-joint or gimbal-bearing vibration
• Gear oil leaking around the propeller shaft or driveshaft

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 5121600TP → Supersedes 5121600LP
• 5121600TP → Replaces earlier 5121500LP 1.94-ratio service applications
• 5121600TP current 1998-and-newer service configuration

OEM / Related Numbers

• 5-5121600TP
• 5121600TP
• 5-5121600LP
• 5121600LP
• 5121500LP
• 5-51100007P Quicksilver 2.00 standard-rotation drive
• 861063A10 related 1.62 / 2.00 upper driveshaft housing

Aftermarket / Verified Equivalents

• Quicksilver: 5-51100007P Alpha Gen II 2.00 replacement drive
• SEI Marine: SE116 complete sterndrive, 2.00 ratio
• SEI Marine: 90-116-series Alpha Gen II replacement assemblies
• Specialist remanufactured 5121600TP / 5121600LP sterndrive

📦 Condition

• Genuine used part
• Removed from running drive where applicable
• In good working condition unless otherwise stated