Mercury Complete Engine Gasket Set 27-42364A92 | 6–15 HP 2-Stroke Outboard
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Mercury Complete Engine Gasket Set 27-42364A92
Part Number: 27-42364A92 (short ref: 42364A92)
Brand: Mercury / Quicksilver
Product Type: Complete Engine Gasket Set — Powerhead & Lower Unit (OEM)
System: Outboard Powerhead / Lower Unit
Supersedes: 42364A91, 42364A86
Quantity Required: 1 complete set per engine
GTIN / UPC: 745061147539
Approximate Weight: 400 g
What This Part Is
The 27-42364A92 is a genuine OEM complete engine gasket set covering both the powerhead and lower unit on selected small Mercury and Mariner 2-stroke outboards. It is a major-service kit intended for powerhead teardowns and engine rebuilds, not a top-end-only or head gasket kit. Individual gasket and seal usage varies by engine model — not every component in the set is used on every supported horsepower application.
Compatible Applications
Confirm engine horsepower, serial number, and the complete gasket-set parts diagram before ordering. Fitment varies by production year and serial range within each horsepower family.
- Mercury / Mariner 6 HP 2-stroke (selected 1986–1993)
- Mercury / Mariner 8 HP 2-stroke (selected 1986–1993)
- Mercury / Mariner 9.9 HP 2-stroke (selected 1986–1993)
- Mercury / Mariner 10 HP / 10 Magnum / 10 Marathon 2-stroke (selected 1990–1998)
- Mercury XR10 2-stroke (selected applications)
- Mercury / Mariner 15 HP 2-stroke (selected 1988–1993)
Kit Components
Component usage varies by engine model. Typical contents include:
- Reed block gasket
- Baffle plate gasket
- Exhaust cover gasket
- Cylinder block cover gasket
- Intake cover gasket (selected 6/8 HP configurations)
- Thermostat cover gasket
- Powerhead-to-adapter-plate gasket
- Water-tube seal
- Water-tube gasket
- Driveshaft-housing gasket
- Lower-unit O-ring
- Water-inlet-tube seal
Match each gasket and seal to the Mercury service diagram for your specific engine before assembly. Do not assume every included component applies to your configuration.
Serial Number Notice
Because 42364A92 spans several horsepower families and production years, serial number verification is essential. Gasket usage, mating surface dimensions, and sealing arrangements can differ between otherwise similar engines in the same horsepower class. Always confirm against the parts diagram for your exact engine serial number.
When to Use This Kit
- Powerhead teardown or complete engine rebuild
- Cylinder block or cover service
- Exhaust-cover removal and service
- Reed-block or intake service
- Thermostat or cooling-passage overhaul
- Powerhead removal from the driveshaft housing
- Lower-unit or water-tube sealing service as part of a broader rebuild
Installation Notes
- Match each gasket and seal to the exact Mercury service diagram for the engine being rebuilt
- Clean all mating surfaces and inspect aluminum sealing surfaces for corrosion, distortion, or old gasket residue before assembly
- Do not assume every gasket in the set is used on your specific horsepower configuration
- While the powerhead is apart, inspect the water-pump components and lower-unit driveshaft seals — access is already available at this point
Part Number Cross-Reference
- Current OEM: 27-42364A92 / 42364A92
- Supersedes: 42364A91
- Supersedes: 42364A86
- Supersession chain: 42364A86 → 42364A91 → 42364A92
Technical FAQ
Q: Is this a head gasket kit or a complete engine gasket set?
A: This is a complete powerhead-and-lower-unit gasket set, not a head-gasket-only kit. It covers the full range of gaskets and seals needed for a major engine teardown on supported 6–15 HP 2-stroke applications.
Q: Do I need all the gaskets in the kit for my engine?
A: Not necessarily. Individual component usage varies by engine model and horsepower. For example, the intake-cover gasket included in the set applies to certain 6/8 HP configurations but is not used on every supported engine. Always reference your specific engine’s parts diagram.
Q: What does the A92 suffix mean?
A: It indicates the current revision in Mercury’s kit part numbering. 42364A92 supersedes the earlier 42364A91 and 42364A86 kits. Always order by the current number to ensure you receive the latest component specification.
Parts Desk Insights
Best use case: 27-42364A92 is the right kit when a supported 6–15 HP Mercury or Mariner 2-stroke engine is going through a full powerhead teardown or rebuild. Ordering the complete gasket set at the start of the job avoids mid-rebuild delays when individual gaskets are found damaged during disassembly.
Common issues: The most frequent mistake is assuming every gasket in the kit applies to the engine being rebuilt — some components are configuration-specific and using the wrong gasket in the wrong location causes leaks. A second common issue is starting a rebuild without also planning for water-pump and lower-unit seal service; with the powerhead off, access to those components is already available and replacing them at the same time avoids a repeat teardown.
Related Parts
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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