Mercruiser MPI Mounting Studs (Set of 3) | Genuine Used Part

🔧 Product Description

Genuine MerCruiser MPI Throttle Body Mounting Studs - Part Number: 16-866204

A set of three genuine MerCruiser double-ended mounting studs used to secure the MPI throttle body and adaptor assembly on selected GM-based V8 sterndrive and inboard engines.

The photographed studs match Mercury Marine part number 16-866204. They are used with throttle-body adaptor 862538001, throttle-body assembly 8M0046460 and 1/4-20 retaining nuts 11-8267138. This listing is supplied as one set of three studs.

⚙️ Key Features

• Genuine Mercury MerCruiser OEM mounting studs
• Correct OEM part number 16-866204
• Supplied as a set of three
• Used with MPI throttle-body adaptor 862538001
• Fits selected 5.0L, 5.7L, 350 MAG, 377 MAG and 6.2L MPI engines

🚤 Compatibility

Commonly used on

• MerCruiser GM small-block V8 MPI throttle-body and adaptor assemblies
• Alpha, Bravo and MIE inboard engine configurations using stud 16-866204

Typically suits

• Engine models:
• MerCruiser 5.0L MPI Alpha / Bravo - serial 0W310000 to 0W649999
• MerCruiser 5.0L MPI Alpha / Bravo - serial 0W650000 to 1A299999
• MerCruiser 5.0L MPI Alpha / Bravo - serial 1A300000 to 1A611927
• MerCruiser 5.0L MPI Alpha / Bravo - serial 1A611928 to 1A623184
• MerCruiser 5.0L MPI Alpha / Bravo - serial 1A623185 and above
• MerCruiser 5.0L MPI EC Alpha / Bravo - serial 1A300000 and above
• MerCruiser 350 MAG MPI Alpha / Bravo - serial 0W310000 to 0W649999
• MerCruiser 350 MAG MPI Alpha / Bravo - serial 0W650000 to 1A299999
• MerCruiser 350 MAG MPI Alpha / Bravo - serial 1A300000 to 1A611927
• MerCruiser 350 MAG MPI Alpha / Bravo - serial 1A611928 to 1A623184
• MerCruiser 350 MAG MPI Alpha / Bravo - serial 1A623185 and above
• MerCruiser 350 MAG MPI Horizon Alpha / Bravo - serial 0W310000 and above
• MerCruiser 377 MAG MPI Bravo - serial 1A300000 to 1A611927
• MerCruiser 377 MAG MPI Bravo - serial 1A611928 to 1A623184
• MerCruiser 377 MAG MPI Bravo - serial 1A623185 and above
• MerCruiser 377 MAG MPI EC Bravo - serial 1A343300 and above
• MerCruiser 350 MAG MPI MIE - serial 0W390000 to 0W689999
• MerCruiser 350 MAG MPI MIE - serial 0W690000 to 1A089999
• MerCruiser 350 MAG MPI Horizon MIE - serial 0W390000 to 1A089999
• MerCruiser 5.7L MPI MIE - serial 1A090000 to 1A092168
• MerCruiser 5.7L MPI MIE - serial 1A092169 and above
• MerCruiser 5.7L MPI Horizon MIE - serial 1A090000 and above
• MerCruiser 6.2L MPI MIE - serial 1A090000 to 1A092168
• MerCruiser 6.2L MPI MIE - serial 1A092169 and above
• MerCruiser 6.2L MPI Horizon MIE - serial 1A090000 and above
• MerCruiser MX 6.2L MPI Bravo - serial 0W310000 to 1A299999
• MerCruiser MX 6.2L MPI MIE - serial 0W390000 to 1A089999
• MerCruiser MX 6.2L MPI Horizon Bravo / MIE - serial 0W310000 to 1A299999
• Engine Size: 5.0L, 5.7L and 6.2L / 305, 350 and 377 CID
• Engine Type: MerCruiser GM small-block V8 MPI petrol sterndrive and inboard engine
• Year Range: Approximately 2006 onward, dependent on engine serial number

🔌 Function

The studs thread into the throttle-body adaptor or intake mounting structure and provide the fixed mounting points used to locate and clamp the MPI throttle body. Correct studs maintain throttle-body alignment and even gasket compression.

⚠️ Common Signs of Failure

• Damaged or stripped threads
• Studs bent during throttle-body removal
• Heavy corrosion around the exposed threads
• Throttle body will not tighten evenly
• Loose throttle body causing an intake-air leak
• Stud seized in the adaptor or intake mount

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 16-866204 current / final MerCruiser throttle-body mounting stud reference

OEM / Related Numbers

• 16-866204
• 866204
• 862538001 throttle-body adaptor
• 8M0046460 throttle-body assembly
• 27-863215 throttle-body gasket
• 11-8267138 retaining nut, 1/4-20
• 12-86400 washer
• 26-866232 seal
• 8M0046370 throttle-body mount

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

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