Cylinder Head Gasket – Fits Yamaha, Mercruiser, Parsun 9.9-15HP 4-Stroke (Replaces PAF15-07000100)
Cylinder Head Gasket – Fits Yamaha, Mercruiser, Parsun 9.9-15HP 4-Stroke (Replaces PAF15-07000100) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Cylinder Head Gasket – Fits Yamaha, Mercruiser, Parsun 9.9-15HP 4-S...
Product Details
This aftermarket Cylinder Head Gasket is engineered to fit a range of Yamaha, Mercruiser, and Parsun 9.9HP to 15HP 4-stroke outboard engines. It is designed for Yamaha F9.9, F13.5, and F15 models manufactured between 1998 and 2008, as well as specific Mercruiser and Parsun models sharing the same OEM specifications.
It serves as a direct replacement for Yamaha part numbers 66M-11181-00-00 and 66M-11181-10-00; Mercruiser 27-850836 and 27-8M0052705; and Parsun F15-07000100.
- Engineered for direct OEM replacement fit.
- Constructed from high-quality composite materials.
- Package includes one cylinder head gasket.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Yamaha | 66M-11181-00-00 |
| Yamaha | 66M-11181-10-00 |
| Mercruiser | 27-850836 |
| Mercruiser | 27-8M0052705 |
| Mercruiser | 850836 |
| Mercruiser | 8M0052705 |
| Parsun | F15-07000100 |
Engine & Model Compatibility
Confirm your engine model and year in the table below.
This part is documented to fit the following Yamaha 4-stroke outboards from 1998–2008. Compatibility with Mercruiser and Parsun is based on part number interchange only, as specific model data is unavailable.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Yamaha | F9.9 | 9.9 | 4-Stroke | 1998–2008 | 66M-11181-00-00/66M-11181-10-00 |
| Yamaha | F13.5 | 13.5 | 4-Stroke | 1998–2008 | 66M-11181-00-00/66M-11181-10-00 |
| Yamaha | F15 | 15 | 4-Stroke | 1998–2008 | 66M-11181-00-00/66M-11181-10-00 |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Direct OEM replacement
- Fuel Type
- Gasoline
- Housing Material
- OEM spec composite material
- Product Dimensions
- 18.0 cm L x 14.5 cm W x 0.1 cm H
- Weight
- 0.04 kg (0.09 lbs)
- Warranty
- 1 year (aftermarket)
What’s in the Box
- 1 x Cylinder Head Gasket (Replaces PAF15-07000100)
Installation Notes
- Disconnect the battery and relieve fuel system pressure before beginning work.
- Drain the engine coolant completely to avoid spills.
- Disconnect all electrical connectors, hoses, and linkages from the cylinder head.
- Carefully remove the valve cover and timing components according to your service manual.
- Loosen the cylinder head bolts in the reverse order specified by the manufacturer to prevent warping.
- Lift the cylinder head off the engine block and remove the old gasket.
- Thoroughly clean both the cylinder head and engine block surfaces, ensuring they are free of any old gasket material, oil, or debris.
- Position the new gasket correctly on the engine block, confirming all passages align.
- Carefully place the cylinder head onto the new gasket.
- Install and tighten the head bolts in the sequence and to the torque specifications required by your engine's service manual.
- Reassemble all remaining components in the reverse order of removal.
- Refill coolant, reconnect the battery, and check for leaks upon first start.
Troubleshooting & FAQ
How do I know if my cylinder head gasket is failing?
Common signs of a blown head gasket include engine overheating, white smoke from the exhaust (coolant burning), milky or frothy engine oil (coolant mixing with oil), unexplained coolant loss, or a loss of engine compression and power.
Is this gasket compatible with my specific Mercruiser model?
This part is a direct replacement for Mercruiser part numbers 27-850836 and 27-8M0052705. However, as specific Mercruiser model applications are not provided, you must verify the part number against your engine's service manual or existing part before ordering.
Can I reuse my existing head bolts?
It is strongly recommended to use new cylinder head bolts during installation. Many are "torque-to-yield" (TTY) bolts designed to stretch and are not safe for reuse. Always consult your engine's service manual for specific requirements.
Do I need to use a sealant with this gasket?
This gasket is typically designed to be installed dry. Applying sealants can interfere with its ability to seal correctly unless explicitly required by your engine's service manual for specific areas. Always follow the manufacturer's documented procedure.
What is the recommended replacement interval for a head gasket?
Cylinder head gaskets are not typically replaced on a fixed schedule. They are replaced only when they fail or during a major engine overhaul. Their lifespan depends on engine operating conditions, maintenance, and proper installation.
What is the difference between OEM and aftermarket parts?
This listing is an aftermarket replacement (not OEM). It has been engineered to meet or exceed OEM-level specifications using comparable materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected to ensure quality and consistency.
How much is shipping and how fast will it arrive?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free to most regions, with expedited options available at checkout where applicable. Tracking is provided for all orders.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal marine use. If an issue arises, contact our support team with your order details. Unused items in their original condition can be returned within our standard window. Please see our full policy page or contact us for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears on a compatibility list—do not install.
- This is an aftermarket replacement component, not an Original Equipment Manufacturer (OEM) part.
- Professional installation is strongly recommended for safety, performance, and to prevent engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — With free standard delivery to most regions, our parts typically arrive in 5–15 days.
- Manufacturer-Direct Value — We offer fair pricing by eliminating middlemen, without ever compromising on materials or quality control.
Payment & Security
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