Cylinder Head Gasket – Fits Tohatsu/Nissan 6HP, 8HP, 9.8HP 2-Stroke Outboards (Replaces 3B2-01005-0)
Cylinder Head Gasket – Fits Tohatsu/Nissan 6HP, 8HP, 9.8HP 2-Stroke Outboards (Replaces 3B2-01005-0) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Cylinder Head Gasket – Fits Tohatsu/Nissan 6HP, 8HP, 9.8HP 2-Stroke...
Product Details
This aftermarket Cylinder Head Gasket is designed for a precise fit on Tohatsu and Nissan 6HP, 8HP, and 9.8HP 2-stroke outboard engines manufactured between 1997 and 2006. It also serves as a compatible replacement for popular Chinese outboard brands including Hangkai, Hidea, and Parsun 9.8HP/10HP 2-stroke models, ensuring a reliable seal and restoring engine performance.
It directly replaces Tohatsu part numbers 3B2-01005-0, 3B2-01005-1, and 3B2-01005-2; Nissan equivalents 3B201-0050M, 3B201-0051M, and 3B201-0052M; and Mercury part numbers 27-8036637 and 27-803663021.
- Engineered for direct OEM-level fit and function.
- Designed for use in 2-cylinder, 2-stroke marine gasoline engines.
- Includes one cylinder head gasket for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number | Notes |
|---|---|---|
| Tohatsu | 3B2-01005-0 | Superseded by 3B2-01005-1, then 3B2-01005-2 |
| Nissan | 3B201-0050M | Superseded by 3B201-0051M, then 3B201-0052M |
| Mercury | 27-8036637 | Also replaces 27-803663021 |
Engine & Model Compatibility
Confirm your engine model and year in the tables below.
Tohatsu & Nissan: This part fits the specific 2-stroke models listed for years 1997–2006.
Chinese Brands: Provides a compatible fit for many 9.8HP and 10HP 2-stroke models from Hangkai, Hidea, and Parsun that are based on the Tohatsu design.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Tohatsu | M6B | 6 | 2-Stroke | 1997–2006 | 3B2-01005-0 | Superseded part |
| Tohatsu | M8B | 8 | 2-Stroke | 1997–2006 | 3B2-01005-0 | Superseded part |
| Tohatsu | M9.8B | 9.8 | 2-Stroke | 1997–2006 | 3B2-01005-0 | Superseded part |
| Nissan | NS6B | 6 | 2-Stroke | 1997–2006 | 3B201-0050M | Superseded part |
| Nissan | NS8B | 8 | 2-Stroke | 1997–2006 | 3B201-0050M | Superseded part |
| Nissan | NS9.8B | 9.8 | 2-Stroke | 1997–2006 | 3B201-0050M | Superseded part |
| Hangkai | Various | 9.8/10 | 2-Stroke | Compatible | Aftermarket fit | |
| Hidea | Various | 9.8/10 | 2-Stroke | Compatible | Aftermarket fit | |
| Parsun | Various | 9.8/10 | 2-Stroke | Compatible | Aftermarket fit |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Direct OEM replacement
- Fuel Type
- Gasoline (2-stroke mix)
- Housing Material
- OEM specification material
- Engine Type
- For 2-cylinder 2-stroke engines
- Dimensions
- 25.5 cm x 14.5 cm x 0.2 cm (L x W x H)
What’s in the Box
- 1 x Cylinder Head Gasket (Replaces 3B2-01005-0 / 3B2-01005-1 / 3B2-01005-2)
Installation Notes
- Disconnect the battery and ground the ignition system. Drain the engine coolant completely.
- Remove components obstructing the cylinder head, such as the cover, intake, and exhaust manifolds.
- Following the service manual, loosen and remove the cylinder head bolts in the specified sequence (typically in reverse order of tightening).
- Carefully lift the cylinder head from the engine block. Avoid using pry tools that could damage the mating surfaces.
- Remove the old head gasket. Thoroughly clean all old gasket material, sealant, oil, and grime from both the engine block and cylinder head surfaces.
- Verify the new gasket is clean and correctly oriented before placing it on the engine block.
- Lower the cylinder head into position without disturbing the new gasket.
- Install new or verified head bolts. Torque them to the manufacturer's specifications in the correct pattern and sequence.
- Reassemble all previously removed components and refill the cooling system.
- Reconnect the battery, start the engine, and carefully inspect for any coolant, oil, or compression leaks.
Troubleshooting & FAQ
How do I know if this gasket will fit my engine?
This gasket fits Tohatsu and Nissan 6HP, 8HP, and 9.8HP 2-stroke models from 1997–2006. It is also compatible with many Hangkai, Hidea, and Parsun 9.8/10HP 2-stroke models. Always verify by checking your engine model and original part number against our compatibility tables.
What are the signs of a failed cylinder head gasket?
Common symptoms include engine overheating, loss of power and compression, white smoke from the exhaust (burning coolant), milky or discolored engine oil, or visible coolant/oil leaks from the seam between the cylinder head and engine block.
Can I reuse my old cylinder head bolts?
It is strongly recommended to use new cylinder head bolts during installation. Head bolts can stretch when torqued ("torque-to-yield" bolts are single-use) and may not provide the correct clamping force if reused, which can lead to premature gasket failure.
Is any sealant required with this gasket?
This gasket is typically designed to be installed dry. Unless explicitly specified by your engine's service manual for your specific model, do not use additional sealants, as they can interfere with the gasket's ability to create a proper seal.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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