Timing Cover Gasket Set – Fits Mercruiser 224 CID 3.7L (Replaces 27-68714A6, 27-68714A7)

$20.80

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Product Details

This Timing Cover Gasket Set – Fits Mercruiser 224 CID 3.7L is designed for a range of Mercruiser 4-cylinder engines, including the 165, 170, 180, 190, 470, 485, and 488 HP models (224 CID / 3.7L) manufactured between 1980 and 1989.

It serves as a direct interchange for Sierra 18-4380, GLM 39760, and Mercury/Mercruiser part numbers 27-68714A6, 27-68714A7, 68714, 72098, and 72099.

Engineered for a direct replacement fit.
Specifically designed for 224 CID (3.7L) 4-cylinder Mercruiser engines.
Constructed from durable composite gasket materials to ensure a reliable seal.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
Sierra	18-4380
GLM	39760
Mercury/Mercruiser	27-68714A6
Mercury/Mercruiser	27-68714A7
Mercury/Mercruiser	68714
Mercury/Mercruiser	72098
Mercury/Mercruiser	72099

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Mercruiser	224 CID	165	4-Stroke	1980–1989	27-68714A6/27-68714A7
Mercruiser	224 CID	170	4-Stroke	1980–1989	27-68714A6/27-68714A7
Mercruiser	224 CID	180	4-Stroke	1980–1989	27-68714A6/27-68714A7
Mercruiser	224 CID	190	4-Stroke	1980–1989	27-68714A6/27-68714A7
Mercruiser	470	170	4-Stroke	1980–1989	27-68714A6/27-68714A7	224 CID/3.7L engine
Mercruiser	485	185	4-Stroke	1980–1989	27-68714A6/27-68714A7	224 CID/3.7L engine
Mercruiser	488	185	4-Stroke	1980–1989	27-68714A6/27-68714A7	224 CID/3.7L engine

Technical Specs

Product Type: Timing Cover Gasket Set
Installation: Direct replacement
Housing Material: Gasket material (paper/composite)
Dimensions: 38.0cm x 31.0cm x 2.0cm
Engine Application: For 224 CID (3.7L) 4-cylinder Mercruiser engines

What’s in the Box

1 x Timing Cover Gasket Set

Installation Notes

Disconnect the battery and drain the engine coolant completely.
Remove any components blocking access to the timing cover, such as accessory belts, pulleys, and the water pump.
Carefully unbolt and remove the old timing cover and worn gasket.
Thoroughly clean both the engine block and timing cover mating surfaces, ensuring they are free of old gasket material, sealant, oil, and debris.
Position the new gasket on the engine block, aligning it with the bolt holes.
Reinstall the timing cover and tighten the bolts to the manufacturer's specified torque in the correct sequence.
Reassemble all previously removed components in reverse order.
Refill the cooling system, reconnect the battery, and start the engine to check for any leaks.

Troubleshooting & FAQ

How do I know if this gasket set fits my engine?

This set is specifically for 224 CID (3.7L) 4-cylinder Mercruiser engines manufactured from 1980–1989. Please verify your engine model and year against the compatibility table on this page to ensure a perfect match.

What are the signs of a failing timing cover gasket?

Common symptoms include visible coolant or oil leaks from the front of the engine, unexplained engine overheating, or a milky, emulsified appearance in the engine oil, which indicates coolant contamination.

Is any special sealant required for installation?

While the gasket is designed for a direct dry fit, applying a thin, even layer of a high-quality marine-grade gasket sealant can improve seal reliability. Always consult your engine's service manual for specific recommendations.

How often should this gasket be replaced?

There is no fixed replacement interval. The timing cover gasket should be replaced whenever the timing cover is removed for service or if you detect any signs of a leak or 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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