Sierra 18-2743 Drive Shaft Housing to Bell Housing Gasket, Replaces 19543A4 - Mercruiser Outdrive

The Sierra 18-2743 is a Drive Shaft Housing to Bell Housing Gasket designed to seal the joint between the drive shaft housing and bell housing on Mercruiser outdrives. As part of Sierra's Mercruiser Bell Housing Gasket lineup, this gasket restores a proper seal at this mating surface, helping prevent water intrusion and gear lubricant leakage at the housing joint. Each gasket is supplied one per application, matching the original factory fitment at this connection point.

At 0.06 pounds, the 18-2743 is a light, compact component intended to be replaced whenever the drive shaft housing or bell housing is removed for service, since gaskets should not be reused once disturbed. It cross-references to OEM numbers 19543A4 and 27-94996-2, making it a straightforward replacement for boat owners and marine technicians servicing Mercruiser outdrive lower units.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2743
• Product Name: Drive Shaft Housing to Bell Housing Gasket
• Category: Mercruiser Bell Housing Gaskets
• UPC: 030999775771
• Weight: 0.06 pounds
• Quantity Required: 1
• OEM Cross Reference: 19543A4, 27-94996-2

Fitment

Fits Mercruiser outdrives at the drive shaft housing to bell housing joint.

Replaces (OEM)

• 19543A4
• 27-94996-2

Frequently Asked Questions

What does the Sierra 18-2743 gasket seal? The Sierra 18-2743 seals the joint between the drive shaft housing and the bell housing on a Mercruiser outdrive, preventing water intrusion and lubricant leakage at that connection.

Is the 18-2743 the same as OEM part 19543A4? Yes, Sierra 18-2743 cross-references directly to OEM number 19543A4, so it is a suitable replacement wherever that OEM gasket is called for.

Does 18-2743 also replace OEM number 27-94996-2? Yes, 27-94996-2 is also listed as an OEM cross-reference for the Sierra 18-2743 drive shaft housing to bell housing gasket.

How much does this gasket weigh? The Sierra 18-2743 weighs 0.06 pounds, reflecting its thin, compact gasket construction.

How many gaskets come in one package? One Sierra 18-2743 gasket is required per application at the drive shaft housing to bell housing joint.

What is the UPC for the Sierra 18-2743? The UPC for the Sierra 18-2743 Drive Shaft Housing to Bell Housing Gasket is 030999775771.

Should the gasket be reused after removing the drive shaft housing? No, gaskets like the 18-2743 are single-use seals; once the drive shaft housing or bell housing is separated, install a new 18-2743 rather than reusing the old gasket.

What category of part is the 18-2743? Sierra 18-2743 falls under Mercruiser Bell Housing Gaskets, a category covering seals used at outdrive housing joints.

Is this a genuine Sierra part or a generic aftermarket gasket? The 18-2743 is a Sierra-branded gasket manufactured to fit in place of OEM numbers 19543A4 and 27-94996-2.

Where on the outdrive does the 18-2743 install? It installs at the mating surface between the drive shaft housing and the bell housing on a Mercruiser outdrive.