Timing Cover Gasket – Fits Mercury Marine/Mercruiser Ford V8 Engines (Replaces 27-56108)

$2.99

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Product Details

This replacement Timing Cover Gasket – Fits Mercury Marine/Mercruiser Ford V8 Engines (Replaces 27-56108) is designed for Mercruiser inboard engines with Ford V8 302 and 351 cubic inch powerplants manufactured from 1970–1977. It ensures a precise seal for the engine's timing chain cover assembly.

This gasket provides a direct interchange for Mercury part numbers 27-56108 and 56108, and Quicksilver 27-56108. It is manufactured from high-quality paper/fiber gasket material to meet OEM factory specifications.

Installs on the engine timing chain cover.
Designed for gasoline-fueled marine engines.
Engineered to prevent oil and coolant leaks from the front of the engine.

Part Number Matrix

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

Brand	Part Number
Mercury	27-56108
Mercury	56108
Quicksilver	27-56108

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This gasket is compatible with specific Mercruiser sterndrive and inboard (MIE) models equipped with Ford V8 engines. Please check your engine's serial number to ensure an exact match.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Mercruiser	215 (4 BBL.) FORD 302 V-8	215	4-Stroke	1970–1972	27-56108	Serial range: 2781153-3395720
Mercruiser	215 MIE FORD 302 V-8	215	4-Stroke	1970–1972	27-56108	Serial range: 2781153-3563181
Mercruiser	225 (4 BBL.) FORD 302 V-8	225	4-Stroke	1973–1974	27-56108	Serial range: 3385721-4166999
Mercruiser	225 MIE FORD 302 V-8	225	4-Stroke	1973–1974	27-56108	Serial range: 3385721-4176999
Mercruiser	225-S (4 BBL.) FORD 302 V-8	225	4-Stroke	1973–1974	27-56108	Serial range: 3385721-4166999
Mercruiser	233 FORD 351 V-8	233	4-Stroke	1975–1977	27-56108	Serial range: 4173000-4902304
Mercruiser	233 MIE FORD 351 V-8	233	4-Stroke	1975–1976	27-56108	Serial range: 4173000-4775784
Mercruiser	255 FORD 351 V-8	255	4-Stroke	1973–1974	27-56108	Serial range: 3258728-4175499
Mercruiser	255 MIE FORD 351 V-8	255	4-Stroke	1973–1974	27-56108	Serial range: 3258728-4178299
Mercruiser	888 (2 BBL.) FORD 302 V-8	188	4-Stroke	1971–1977	27-56108	Serial range: 3108723 and up

Technical Specs

Product Type: Timing Cover Gasket
Installation: Engine Timing Chain Cover
Fuel Type: Gasoline
Housing Material: Paper/Fiber Gasket Material
Dimensions: 25.5" L x 29.5" W x 0.1" H
Warranty: 30 days (Green Bay Propeller & Marine LLC)
Other Technical Attributes: OEM Factory Part

What’s in the Box

1 x Timing Cover Gasket (27-56108)

Installation Notes

Drain the engine coolant completely to avoid spills.
Remove the serpentine belt and any accessories blocking the timing cover, such as the water pump and power steering pump.
Remove the crankshaft pulley/harmonic balancer using an appropriate puller tool.
Carefully unbolt and remove the timing cover from the engine block.
Remove the old gasket and thoroughly clean both the engine block and timing cover mating surfaces. Ensure they are free of old gasket material, oil, and debris.
Position the new gasket onto the engine block, aligning it with the bolt holes.
Reinstall the timing cover, ensuring it is seated correctly over the gasket.
Tighten the cover bolts to the manufacturer's specified torque sequence and values.
Reinstall the crankshaft pulley, accessories, and serpentine belt.
Refill the engine with coolant and check for leaks after starting the engine.

Troubleshooting & FAQ

How do I know if my timing cover gasket is failing?

Common signs of a faulty timing cover gasket include visible oil or coolant leaks from the front of the engine, near the crankshaft pulley. You may also notice a low coolant level or milky, contaminated engine oil, which indicates coolant is mixing with the oil.

Will this gasket fit my specific Ford V8 engine?

This gasket is specifically designed for the Mercruiser models listed in the compatibility table, which use Ford 302 and 351 V8 engines from 1970–1977. Always verify your engine's model and serial number against the compatibility chart before ordering.

Should I use sealant with this paper gasket?

While this gasket is designed to seal on its own, some mechanics apply a thin layer of gasket sealant (such as Permatex Aviation Form-A-Gasket) to one or both sides to improve the seal and hold the gasket in place during installation. Consult your engine's service manual for the recommended procedure.

What are the signs of an improper installation?

If the gasket is not installed correctly, you will likely see immediate or premature leaks of oil or coolant from the timing cover area. Over-tightening the bolts can damage the gasket or cover, while under-tightening can lead to an insufficient 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/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

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