Mercury - Idler Pulley Support Bushing - 865193
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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Alternate/Superseded Part Numbers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. ā
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3ā4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us ā and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity ā and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.