816219A4 Mercruiser Exhaust Manifold | Genuine Used Part

🔧 Product Description

Genuine MerCruiser 3.7L Aluminium Exhaust Manifold - Part Number: 816219A4

A genuine MerCruiser aluminium exhaust manifold assembly from the factory conversion system used on MerCruiser 165HP, 170HP, 180HP, 190HP, 3.7L, 3.7LX, 470, 485 and 488 inline four-cylinder engines.

Part number 816219A4 originally identified the complete conversion kit containing the aluminium manifold, cast-iron riser, coolant reservoir, thermostat housing and installation hardware. This listing is for the genuine used manifold component shown or supplied, rather than every component originally included in the new kit.

⚙️ Key Features

• Genuine MerCruiser OEM aluminium exhaust manifold
• Associated with factory conversion kit 816219A4
• Replaces the original cast-iron manifold arrangement
• Fits MerCruiser 3.7L / 224 CID inline four-cylinder engines
• Compatible with the matching aluminium-manifold riser and reservoir system

🚤 Compatibility

Commonly used on

• MerCruiser 3.7L aluminium exhaust-manifold conversion systems
• MerCruiser 470-series closed-cooling exhaust assemblies

Typically suits

• Engine models:
• MerCruiser 165HP 3.7L inline four-cylinder
• MerCruiser 170HP 3.7L inline four-cylinder
• MerCruiser 180HP 3.7L inline four-cylinder
• MerCruiser 190HP 3.7LX inline four-cylinder
• MerCruiser 470 MCM - 1980-1984
• MerCruiser 485 MCM - 1980-1984
• MerCruiser 488 MCM - 1980-1984
• MerCruiser 3.7L - 1985-1989
• MerCruiser 3.7LX - 1985-1989
• HP Range: 165HP - 190HP
• Engine Type: MerCruiser 3.7L / 224 CID inline four-cylinder petrol engine
• Year Range: Approximately 1980-1989

🔌 Function

The manifold collects exhaust gases from the cylinder head and routes them into the wet exhaust elbow. Its closed-cooling passages also carry engine coolant around the exhaust runners to control operating temperature.

⚠️ Common Signs of Failure

• External coolant or exhaust leakage
• Internal corrosion between coolant and exhaust passages
• White exhaust steam or unexplained coolant loss
• Soot staining around the cylinder-head or riser joint
• Cracking, distortion or severe corrosion around the mounting surfaces

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 816219A4 factory aluminium manifold conversion kit
• 816219A5 aluminium exhaust manifold casting
• 99908A3 earlier cast-iron exhaust manifold assembly
• 96768A3 earlier cast-iron exhaust manifold assembly
• 99907 / 96767 earlier manifold casting references

OEM / Related Numbers

• 816219A4
• 816219A5
• 816219
• 99908A3
• 96768A3
• 99907
• 96767
• 98562A6 aluminium-manifold exhaust elbow assembly
• 90880A2 cast-manifold exhaust elbow assembly
• 27-97542 exhaust elbow gasket

Aftermarket / Verified Equivalents

• GLM: 51200 complete exhaust elbow and manifold assembly
• GLM: 51202 aluminium manifold only
• Recmar: RM816219A4
• Barr Marine: MC-1-99908 related replacement manifold
• Aqua Power: 5725 related manifold conversion kit

📦 Condition

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