Mercury MerCruiser Serpentine Belt & Pulley Kit – 8M0150824

Mercury MerCruiser Serpentine Belt & Pulley Kit – 8M0150824

Part Number: 8M0150824
Brand: Mercury Marine / Quicksilver
Official Product Type: Serpentine Belt & Pulley Kit (BELT/PULLEY KIT) – OEM
System: Accessory Belt Drive
Drive Type: Serpentine belt system

About This Kit

This is the genuine Mercury OEM serpentine belt and pulley kit for MerCruiser sterndrive engines. The serpentine belt drive system powers all engine-mounted accessories from a single belt — including the seawater pump, power steering pump, alternator, and other driven components. This kit consolidates the belt and associated pulley components into a single OEM part number, making it the correct choice for a complete accessory drive service or when replacing multiple worn belt drive components at once. Buying the kit is more economical than sourcing the belt and pulleys individually and ensures all components are matched to the same OEM specification.

Compatible Applications

• MerCruiser 4.3L V6 – serpentine belt accessory drive models
• MerCruiser 5.0L V8 – serpentine belt accessory drive models
• MerCruiser 5.7L V8 – serpentine belt accessory drive models
• MerCruiser 6.2L V8 – serpentine belt accessory drive models
• MerCruiser 7.4L V8 – serpentine belt accessory drive models
• MerCruiser 8.2L V8 – serpentine belt accessory drive models

Always verify fitment using your engine serial number. MerCruiser engines of the same displacement can use different accessory drive configurations depending on model year and production serial range. Confirm part number 8M0150824 appears on the Mercury MerCruiser parts diagram for your engine before ordering.

Serial Number / Fitment Note

Locate your MerCruiser engine serial number on the engine block tag or flame arrestor decal. Cross-reference against the Mercury MerCruiser parts diagram for your engine model to confirm this is the correct belt and pulley kit. Some MerCruiser engines use a V-belt accessory drive rather than a serpentine belt — this kit is for serpentine belt systems only.

System & Diagram Position

This kit is found in the Accessory Belt Drive section of the Mercury MerCruiser parts diagram. The serpentine belt routes around all accessory pulleys — seawater pump, power steering pump, alternator, tensioner, and idler — in a single continuous loop. Correct belt tension and pulley alignment across the entire system is critical for reliable operation of all belt-driven accessories.

Kit Contents

Includes the OEM serpentine belt and associated pulley component(s) as packaged by Mercury Marine for part number 8M0150824. Confirm exact kit contents against the Mercury parts diagram for your engine model before beginning service. Individual components are also available separately if only one item requires replacement.

Service Interval

Inspect the serpentine belt and all pulleys annually or every 100 hours, whichever comes first. Replace the belt at the first sign of cracking, glazing, rib loss, or fraying. Pulleys should be replaced when grooves are worn smooth, when wobble or runout is detected, or whenever the belt has been running on a damaged pulley surface. A complete belt and pulley service is recommended at the 300-hour major service interval.

When to Replace

• Belt cracking, glazing, missing ribs, or fraying
• Belt squeal or chirp that persists after tension adjustment
• Pulley grooves worn smooth — causes belt slip and accelerated belt wear
• Pulley wobble or runout detected when spun by hand
• Belt misalignment across the accessory drive
• Any overheating event traced to reduced seawater pump speed from belt slippage
• Scheduled 300-hour major service

Installation Notes

• A pulley puller and installer tool is required for any pulley replacement — do not hammer pulleys on or off the shaft
• Confirm alignment of all pulleys using a straightedge before installing the new belt
• Check and set belt tension per the Mercury MerCruiser service manual specification
• Inspect the tensioner and idler pulley bearings for roughness or play and replace if needed
• After installation, run the engine and verify normal coolant temperature, charging voltage, and power steering operation

Related Parts

• Mercury MerCruiser Power Steering Pump Pulley – 8M0150723
• Mercury MerCruiser Seawater Pump Pulley – 8M0150724
• Quicksilver Water Pump Pulley – 8M0153706
• Mercury MerCruiser Quicksilver Tensioner Pulley – 865777
• Mercury MerCruiser Quicksilver Idler Pulley 3.50 In Diameter Grooved – 865444T
• Mercury MerCruiser Quicksilver Serpentine Belt – 865615Q03
• Mercury MerCruiser Quicksilver Serpentine Belt – 8M0045986
• Mercury MerCruiser Quicksilver Serpentine Belt – 8M0135333
• Mercury MerCruiser Power Steering Pump without Pulley – 16792A39

Technical FAQ

What is included in this kit vs. buying the belt and pulleys separately?
This OEM kit packages the serpentine belt and associated pulley(s) together as a matched set. Buying the kit ensures all components meet the same OEM specification and are designed to work together. Confirm exact contents against the Mercury parts diagram for your engine.

How do I know if my MerCruiser uses a serpentine belt or a V-belt?
Serpentine belt systems use a single flat ribbed belt that routes around multiple pulleys in one continuous loop. V-belt systems use one or more separate V-shaped belts. Check your engine’s accessory drive visually or look up your serial number in the Mercury parts diagram to confirm which system your engine uses.

Can I replace just the belt without replacing the pulleys?
Yes, if the pulleys are in good condition. However, if a pulley has been running with a worn or damaged belt, inspect it carefully for groove wear and surface damage before reusing it. A worn pulley will quickly destroy a new belt.

What causes serpentine belts to fail prematurely on marine engines?
The most common causes are misaligned pulleys, a seized or rough tensioner bearing, a worn idler pulley, and saltwater or oil contamination on the belt surface. Inspect all pulleys and the tensioner whenever replacing the belt.

Parts Desk Insights

Best use case: This kit is the right choice for a complete accessory drive service on a MerCruiser sterndrive — particularly at the 300-hour major service interval or after a belt failure. Ordering the kit is more economical than sourcing the belt and pulleys separately, and it ensures everything is replaced to OEM spec in a single service visit.

Common issues: Customers sometimes order this kit without confirming their engine uses a serpentine belt system — always verify before ordering. A second common issue is replacing the belt and pulleys without inspecting the tensioner and idler bearings; a rough tensioner bearing will destroy a new belt within a season. Also watch for customers who replace only the belt after a failure without identifying what caused the belt to fail — a misaligned or seized pulley is usually the root cause and must be addressed at the same time.