Sierra Serpentine Belt 18-15112, Replaces Mercruiser 57-8077554, Fits MerCruiser MX 6.2L MPI MIE 1999-01

The Sierra 18-15112 is a serpentine belt engineered to OEM standards for correct fit, form, and function on MerCruiser MX 6.2L MPI inboard/sterndrive engines. Serpentine belts drive multiple accessories -- such as the alternator and water circulation components -- off a single continuous belt routed around the engine's pulley system, so a belt that runs true and holds tension is essential to keeping the charging and cooling systems working together without slip or noise.

This belt is constructed from polychloroprene rubber reinforced with polyester fiber tensile members, giving it oil resistance and temperature stability so it holds up to the heat and exposure to fuel and oil residue typical in a marine engine compartment. It is built as a direct-fit replacement for the MerCruiser MX 6.2L MPI MIE engine covered by this part number, cross-referencing Mercruiser part number 57-8077554.

Sierra manufactures this belt to match the original routing length and width so it installs on the factory pulley system without modification. Every Sierra part, including this belt, is backed by Sierra's industry-leading customer satisfaction warranty.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-15112
• Product Type: Serpentine Belt
• Material: Polyester, Rubber (polychloroprene rubber with polyester fiber tensile members)
• Color: White
• Weight: 0.45 pounds
• Unit Count: 1 belt

Fitment

• MerCruiser MX 6.2L MPI MIE, model years 1999-01, serial numbers OL670000 through OM310099

Replaces (OEM)

• Mercruiser 57-8077554

Frequently Asked Questions

What engine does the Sierra 18-15112 serpentine belt fit? The Sierra 18-15112 fits the MerCruiser MX 6.2L MPI MIE engine, specifically units within serial number range OL670000 through OM310099, corresponding to model years 1999-01.

Does 18-15112 replace a specific Mercruiser part number? Yes, Sierra 18-15112 cross-references Mercruiser part number 57-8077554, so it can be ordered as a direct equivalent for that engine's serpentine belt.

How much does this belt weigh? The Sierra 18-15112 serpentine belt weighs 0.45 pounds.

What material is the 18-15112 belt made from? It is constructed from polychloroprene rubber reinforced with polyester fiber tensile members, giving the belt oil resistance and temperature stability.

Is the Sierra 18-15112 an OEM part or an aftermarket replacement? 18-15112 is a Sierra aftermarket belt manufactured to OEM specifications for fit, form, and function as a replacement for Mercruiser 57-8077554.

Will this belt fit a MerCruiser engine outside the OL670000-OM310099 serial range? Sierra 18-15112 is specified for the MX 6.2L MPI MIE engine within serial numbers OL670000 through OM310099 (model years 1999-01); engines outside that serial range use a different Sierra part number.

How many belts come in the package? The 18-15112 is sold as a single serpentine belt, one unit per package.

What color is the Sierra 18-15112 belt? This serpentine belt is white in color.

Is the 18-15112 belt covered under warranty? Yes, the Sierra 18-15112 serpentine belt is backed by Sierra's industry-leading customer satisfaction warranty.

What type of belt is 18-15112? Sierra 18-15112 is a serpentine belt, which drives multiple engine accessories off a single continuous belt path rather than separate individual belts.

Can this belt be used on Ski or Horizon MerCruiser variants? 18-15112 is specified for the MX 6.2L MPI MIE engine; Ski and Horizon variants of the MX 6.2L MPI engine use different Sierra part numbers for their serpentine belt.