78033 Mercury Intake Cover | Genuine Used Part

🔧 Product Description

Genuine Mercury Intake Manifold Cover - Part Number: 78033

A genuine Mercury intake cover for selected 7.5HP and 9.8HP twin-cylinder two-stroke outboards.

The cover seals the intake passage on the cylinder block and works with the matching gasket to maintain crankcase vacuum and correct fuel-and-air flow.

⚙️ Key Features

• Genuine Mercury intake cover
• Correct part number 78033
• Fits selected 7.5HP and 9.8HP engines
• Bolts directly to the cylinder block and crankcase
• Uses matching intake-cover gasket 27-780321

🚤 Compatibility

Commonly used on

• Mercury portable twin-cylinder intake assemblies

Typically suits

• Engine models:
• Mercury 7.5HP
• Mercury 75 model designation for 7.5HP
• Mercury 9.8HP
• Mercury Merc 110
• Serial families 5206550 and above
• Serial families 7125388 and above
• Serial families 8057545 and above
• Serial families 9217756 and above
• HP Range: 7.5HP - 9.8HP
• Engine Type: Mercury twin-cylinder carburetted two-stroke outboard
• Year Range: Approximately mid-1970s-mid-1980s

🔌 Function

The intake cover seals the engine's intake and crankcase passage. An airtight seal is essential for the pressure pulses that draw fuel through the carburettor and into the crankcase.

⚠️ Common Signs of Failure

• Engine idles poorly or runs lean
• Fuel mist leaks around the cover
• Cover is cracked or distorted
• Gasket surface is damaged
• Mounting screws or threads are stripped

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 78033 current documented OEM intake-cover reference

OEM / Related Numbers

• 78033
• 27-780321 related intake-cover gasket
• Related intake and reed components
• Related cylinder-block mounting screws

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

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