Sierra 18-15400 V-Belt for 8.2L 502 CID MIE/MPI/600 SC Engines, Replaces Mercury Marine 57-32850

The Sierra 18-15400 is a V-Belt designed as a drive belt replacement for 8.2L 502 CID, 8-cylinder marine engines. It is built to transfer power reliably between the crankshaft pulley and accessory components such as the water pump, alternator, or power steering pump on applicable engine applications. The belt is finished in black and is supplied as a single unit (1 count).

This V-Belt is engineered as a direct cross-reference replacement for the Mercury Marine 57-32850 and 57-69143T belts as well as the OMC 311606 belt, allowing owners to source a compatible replacement without needing the original manufacturer part number. It fits specific serial-number ranges across three 502 CID engine applications: the 8.2L 600 SC (1992-2000), the 8.2L MIE (1993-1997), and the 8.2L MPI MIE (1996-1997). Confirming the engine serial number against these ranges before ordering ensures the correct belt is installed.

Sierra manufactures this belt for straightforward removal-and-replacement service, making it a practical stocking item for scheduled maintenance or belt failure repairs on these MerCruiser-family 502 CID engines.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-15400
• Product Type: V-Belt
• Belt Style: V-Belt
• Color: Black
• Weight: 0.19 pounds
• Engine Displacement: 502 CID
• Cylinders: 8
• OEM Cross Reference: 57-32850, 57-69143T, 311606
• Compatible Serial Range, 8.2L 600 SC: D725676 - L601186
• Compatible Serial Range, 8.2L MIE: D857200 - K999999
• Compatible Serial Range, 8.2L MPI MIE: F819620 - K147349

Fitment

• 8.2L 600 SC, 502 CID, 8-cylinder, 1992-2000, serial range D725676 - L601186
• 8.2L MIE, 502 CID, 8-cylinder, 1993-1997, serial range D857200 - K999999
• 8.2L MPI MIE, 502 CID, 8-cylinder, 1996-1997, serial range F819620 - K147349

Replaces (OEM)

• 57-32850
• 57-69143T
• 311606

Frequently Asked Questions

What engines does the Sierra 18-15400 V-belt fit? The Sierra 18-15400 fits three 502 CID, 8-cylinder engine applications: the 8.2L 600 SC (1992-2000, serial range D725676 - L601186), the 8.2L MIE (1993-1997, serial range D857200 - K999999), and the 8.2L MPI MIE (1996-1997, serial range F819620 - K147349).

Is the Sierra 18-15400 the same as the Mercury Marine 57-32850 belt? Yes, the Sierra 18-15400 is a direct cross-reference replacement for the Mercury Marine 57-32850 belt, along with the Mercury Marine 57-69143T and OMC 311606 belts.

Does 18-15400 replace an OMC belt number? Yes, part 18-15400 cross-references to OMC belt number 311606 in addition to the Mercury Marine numbers 57-32850 and 57-69143T.

How much does the 18-15400 V-belt weigh? The Sierra 18-15400 V-belt weighs 0.19 pounds.

What color is the 18-15400 belt? The Sierra 18-15400 V-belt is black.

How many belts come in the package? The Sierra 18-15400 is sold as a single V-belt (one unit per package).

How do I know if this belt fits my engine serial number? Check your engine's serial number against the ranges listed for the 18-15400: D725676 - L601186 for the 8.2L 600 SC, D857200 - K999999 for the 8.2L MIE, or F819620 - K147349 for the 8.2L MPI MIE, since fitment for this belt is serial-number specific within each model.

Is the 18-15400 a V-belt or a serpentine belt? The 18-15400 is a V-belt style belt, not a serpentine belt.

What is the engine displacement for the applications this belt fits? All listed applications for the Sierra 18-15400 are 502 CID, 8-cylinder engines.

Can I use the 18-15400 on a 1998-2001 8.2L 502 MAG MPI engine? No, the 8.2L 502 MAG MPI (1998-2001) uses a serpentine belt system with a different part number, not the 18-15400 V-belt.

Is the Sierra 18-15400 an aftermarket or genuine part? The 18-15400 is manufactured by Sierra as a cross-reference replacement belt, not an original Mercury Marine or OMC branded part, though it is built to fit the same engine applications as OEM numbers 57-32850, 57-69143T, and 311606.