Description

The Mercury MerCruiser Quicksilver Idler Pulley Support Bushing 865193 is an OEM support spacer used with compatible MerCruiser serpentine belt idler pulley assemblies. It helps position and support the idler pulley so the belt tracks correctly across the accessory drive system.

Key Features

• Genuine Mercury/Quicksilver support bushing
• Part number: 865193
• Aluminum support/spacer component
• Used with select serpentine belt idler pulley assemblies
• Helps maintain correct pulley alignment
• Commonly paired with idler pulley 864625T
• Related pulley references include 807757T and 8M6500024

Engine Compatibility

Fits select GM-based MerCruiser marine engines with serpentine accessory belt systems, including 4.3L V6, 5.0L V8, 5.7L / 350 MAG, Black Scorpion, Towsport, and 6.2L / MX 6.2L applications across compatible Alpha, Bravo, and inboard layouts.

Serial Number Fitment Notice

Verify fitment by engine serial number, belt routing diagram, accessory bracket layout, and original bushing part number before ordering. Pulley support hardware can vary by engine model, bracket design, and production range.

When This Part Needs Replacement

Replace this bushing if it is worn, corroded, distorted, missing, cracked, or if the idler pulley no longer sits flush with the belt path.

Installation Notes

Inspect the idler pulley, mounting bolt, belt tensioner, serpentine belt, and adjacent pulleys during service. This is also a good time to replace a cracked, glazed, frayed, or oil-soaked serpentine belt.

Alternate/Superseded Part Numbers

Primary Mercury references: 865193, 818380, and 818380T.

Parts Desk Insight

Small pulley spacers matter because belt alignment depends on them. A worn or missing bushing can make a good pulley track incorrectly and shorten belt life.

Shipping: Ships same or next day for fast Canada wide shipping.