Mercury MerCruiser Drive Gasket Set 64818T4
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Mercury / MerCruiser Quicksilver Drive Gasket Set — 64818T4
The Mercury Quicksilver 64818T4 (Mercury format 27-64818T4) is a genuine OEM drive / bell-housing gasket set designed for early MerCruiser MC-I sterndrives. The kit contains the gaskets required when installing or servicing the bell housing assembly, ensuring a proper seal between the engine and sterndrive components.
Key Specifications
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Part Number: 64818T4
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Mercury Format: 27-64818T4
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Component Type: Drive / bell housing gasket set
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OEM Brand: Mercury Marine / Quicksilver
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Superseded Number: 64818BK4
Compatible Applications
This gasket set is designed for MerCruiser MC-I sterndrives, including:
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MC-I drives (serial numbers 6225576 and below)
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Typical model years 1967–1982
These drives were commonly paired with early MerCruiser inline-4 and V-8 marine engines in classic runabouts and cruisers.
What’s Included
The 64818T4 kit typically contains five factory-spec gaskets used when reinstalling or servicing the bell housing.
These gaskets seal critical interfaces between the:
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Engine flywheel housing / bell housing
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Sterndrive mounting surfaces
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Drive housing components
Replacing the entire set during service ensures an even seal and prevents leaks.
Function
The gasket set helps to:
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Prevent water intrusion between engine and drive components
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Maintain proper alignment and sealing of the bell housing
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Protect internal components from corrosion and contamination
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Maintain reliable cooling and drivetrain operation
⚠️ Fitment Tip:
Because MerCruiser used several early drive models (MC-I, R, MR, Alpha), always verify the sterndrive model and serial number before ordering to ensure the correct gasket set.
When to Replace:
Replace all drive gaskets whenever separating drive housing components for any reason, including drive service, seal replacement, gear changes, or repairs. Gaskets are single-use components and should never be reused. Always use a complete new gasket set during drive reassembly to ensure proper sealing and prevent leaks.
Installation:
Professional installation recommended. Follow Mercury service procedures for proper installation. Clean all gasket surfaces thoroughly, removing old gasket material and debris. Ensure surfaces are flat and free from damage. Install gaskets dry or with appropriate sealant as specified by Mercury. Align gaskets properly with all mounting holes. Torque fasteners to specifications in the proper sequence to ensure even compression and proper sealing.
Service Best Practices:
Always use genuine Mercury MerCruiser OEM gasket sets for drive service. Never reuse old gaskets. Inspect housing surfaces for damage during gasket replacement. Use proper torque specifications and tightening sequence. Fill drive with correct gear oil to proper level. Check for leaks after installation. Follow Mercury maintenance schedules for optimal drive performance and longevity.
Shipping:
OEM parts ship same or next day for fast Canada wide shipping.
Technical Specifications:
- Type: Complete drive gasket set
- Compatible with: Mercury MerCruiser sterndrive and outdrive units
- Part Number: 64818T4
- Kit includes: All necessary gaskets for drive assembly
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 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 — 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 — 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.