87399A3 Aftermarket Mercruiser Cylinder Overhaul Kit | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket MerCruiser Alpha One Gen II Trim-Cylinder Overhaul Kit - Part Number: 87399A3

Complete internal service kit for one Alpha One Gen II hydraulic trim cylinder. Two kits are required to overhaul both cylinders on a complete sterndrive installation.

⚙️ Key Features

• Services one trim cylinder

• Designed for Alpha One Gen II cylinder assemblies

• Renews the principal piston, rod, end-cap and static seals

• Suitable for port or starboard cylinder

• Use two kits for a complete paired-cylinder overhaul

📋 Kit / Assembly Contents

• 1 × Piston-seal group - supplied under 87399A3

• 1 × Rod-seal group - supplied under 87399A3

• 1 × End-cap O-ring group - supplied under 87399A3

• 1 × Wiper/dust-seal group - supplied under 87399A3

• 1 × Internal static O-ring and backup-ring group - supplied under 87399A3

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 87399A3 → Current overhaul-kit reference for the applicable Alpha One Gen II cylinder

• Earlier individual seal references are consolidated in the complete kit

OEM / Related Numbers:

• 87399A3

• REC87399A3

• GLM 26580

• Mercury service seal kit family 25-87400A2

• 58-08211 aftermarket seal-kit family

Aftermarket / Verified Equivalents:

• Recmar: REC87399A3

• GLM: 26580

• Aftermarket Alpha One Gen II cylinder seal kits matched to 87399A3

🚤 Compatibility

Commonly used on:

• MerCruiser Alpha One Generation II trim cylinders

Typically suits:

• Engine / drive models:

• Alpha One Gen II 1991-1995, serial 0D469859-0F679999

• Alpha One Gen II 1996-1997, serial 0F680000-0K999999

• Alpha One Gen II 1998 and later, serial 0L100040 and up

• Port and starboard cylinders that list 87399A3

• HP Range: Drive application; not engine-horsepower specific

• Engine / Drive Type: Hydraulic trim-cylinder internal overhaul kit

• Year Range: 1991 onward

• Serial / Identification Range: Confirm cylinder casting/serial; some late assemblies use revised seal kits. Two kits are normally required per sterndrive.

🔌 Function

Restores internal pressure sealing and external rod protection so the cylinder can move smoothly and hold the drive under load.

Common signs of failure or replacement requirement:

• Fluid leaking at rod or cap

• Drive drifts down

• Unequal cylinder travel

• Jerky operation or internal bypass

• Corroded rod damaging new seals

📦 Condition

• Brand-new aftermarket replacement part

• Supplied as a new replacement component

• Supplied in suitable retail or equivalent packaging