Head Gasket – Fits Mercury/Mercruiser 3.7L (Replaces 27-13709)
Head Gasket – Fits Mercury/Mercruiser 3.7L (Replaces 27-13709) 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
Head Gasket – Fits Mercury/Mercruiser 3.7L (Replaces 27-13709)
Product Details
This replacement Head Gasket – Fits Mercury/Mercruiser 3.7L is designed for 224 CID engines manufactured between 1976 and 1989. It creates a secure seal between the cylinder head and the engine block, essential for maintaining compression and preventing fluid leaks.
This gasket is a direct interchange for Quicksilver part number 27-13709.
- Installs between the cylinder head and engine block.
- Engineered for gasoline marine engines.
- Replaces the original head gasket to restore engine integrity.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Quicksilver | 27-13709 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Stroke | Years | OEM Part No. |
|---|---|---|---|---|
| Mercury/Mercruiser | 3.7L (224 CID) | 4-Stroke | 1976–1989 | 27-13709 |
Technical Specs
- Product Type
- Head Gasket
- Installation
- Cylinder head to engine block
- Fuel Type
- Gasoline
- Dimensions
- 10.0" x 22.0" x 0.19"
- Weight
- 0.45 kg (1 lb)
- Other Technical Attributes
- Replaces Mercury/Mercruiser head gasket for 3.7L engines
What’s in the Box
- 1 x Head Gasket (27-13709)
Installation Notes
- Drain the engine coolant and safely disconnect the battery.
- Remove the exhaust manifold, intake manifold, and valve cover.
- Loosen and remove the cylinder head bolts in the reverse order of the torque sequence specified by the manufacturer.
- Carefully lift the cylinder head off the engine block. Do not pry between the head and block.
- Clean both the cylinder head and engine block surfaces meticulously, removing all old gasket material and debris.
- Place the new head gasket onto the engine block, ensuring it is correctly oriented. Do not use sealant unless specified by the gasket maker.
- Carefully place the cylinder head back onto the block.
- Install new or inspected head bolts and tighten them in stages, following the manufacturer's recommended torque sequence and specifications.
- Reassemble all other components (manifolds, valve cover, etc.) and reconnect the battery.
- Refill the cooling system, start the engine, and check for any leaks.
Troubleshooting & FAQ
How do I know if this head gasket fits my engine?
This gasket is specifically for Mercury/Mercruiser 3.7L (224 CID) 4-stroke engines from 1976–1989. Verify your engine model and year, and cross-reference the OEM part number 27-13709 to ensure compatibility.
What are the signs of a failing head gasket?
Common symptoms include engine overheating, white smoke from the exhaust (coolant burning), milky or frothy engine oil (coolant mixing with oil), loss of compression, and unexplained coolant loss.
Do I need to use sealant with this gasket?
Generally, modern head gaskets are designed to be installed dry without any additional sealants. Applying sealant can interfere with the gasket's ability to create a proper seal. Always follow the specific instructions from your engine's service manual.
What is the proper torque sequence for a Mercruiser 3.7L head?
The correct torque sequence and specifications are critical for a successful installation. This information must be obtained from the official service manual for your specific engine model and year. Incorrect torquing can lead to gasket failure.
Can I reuse my old head bolts?
It is strongly recommended to use new head bolts. Many are "torque-to-yield" (TTY) bolts that permanently stretch when tightened and cannot provide the correct clamping force if reused, risking gasket failure.
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/specifications vs 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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