Sierra 18-7168-9 Gimbal Housing O-Ring, MerCruiser Bravo I/II Stern Drives, Pack of 5

The Sierra 18-7168-9 is a rubber O-ring sized for the gimbal housing of MerCruiser Bravo I/II stern drives, sold as a pack of 5. Two of these O-rings are used per gimbal housing on Bravo (I/II) units with beginning serial number B664190 and up, so this pack provides enough O-rings to reseal one housing with spares left over, or to keep on hand for a shop servicing multiple drives. The O-ring is molded in black rubber for resistance to marine gear lube, water intrusion, and the heat and vibration found at the drive-to-transom connection.

Replacing the gimbal housing O-ring is a standard step whenever the housing is opened for service, such as during a bellows replacement, U-joint service, or gimbal bearing job, since the original seal can take a compression set or lose elasticity once removed. Using a properly sized, application-specific O-ring rather than a generic hardware-store substitute helps maintain the seal against water and lubricant leakage at this critical connection point.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7168-9
• Product Type: Gimbal Housing O-Ring
• Material: Rubber
• Color: Black
• Package Quantity: 5 O-rings per pack
• Package Dimensions: 3.7 inches L x 3.6 inches W x 0.2 inches H
• Weight: 0.01 pounds
• Quantity Used Per Gimbal Housing: 2
• UPC: 808282165468
• Country of Origin: Taiwan

Fitment

• MerCruiser Bravo (I/II) stern drives, beginning serial number B664190 and up

Frequently Asked Questions

What does the Sierra 18-7168-9 O-ring fit? It is sized for the gimbal housing on MerCruiser Bravo (I/II) stern drives with a beginning serial number of B664190 and up, where two of these O-rings are used per housing.

How many O-rings come in a pack? The 18-7168-9 is sold in a pack of 5 rubber O-rings, giving enough for one full gimbal housing reseal (2 used per housing) plus spares.

What material is the 18-7168-9 O-ring made from? It is molded in black rubber, chosen for its resistance to marine gear lubricant, water, and the heat and vibration present at the gimbal housing.

How many of these O-rings are needed per job? MerCruiser Bravo (I/II) gimbal housings in the covered serial range use 2 of the 18-7168-9 O-rings each, so a single 5-pack covers one job with 3 left over.

What size is the 18-7168-9 O-ring package? The packaged O-ring set measures 3.7 inches long by 3.6 inches wide by 0.2 inches high and weighs 0.01 pounds.

Is the 18-7168-9 an OEM or aftermarket part? The 18-7168-9 is a Sierra-branded replacement O-ring manufactured to fit the MerCruiser Bravo (I/II) gimbal housing specification rather than an OEM MerCruiser part.

When would I need to replace this O-ring? This O-ring should be replaced any time the gimbal housing is opened for service, such as bellows, U-joint, or gimbal bearing work, since a removed O-ring loses its sealing compression set.

Where is the 18-7168-9 O-ring manufactured? The Sierra 18-7168-9 O-ring is made in Taiwan.

Does the 18-7168-9 fit other MerCruiser stern drive models besides Bravo I/II? The 18-7168-9 O-ring is specified for the Bravo (I/II) gimbal housing at serial number B664190 and up; other stern drive models use different Sierra oil seal and O-ring part numbers for their gimbal housings.

What color is the 18-7168-9 O-ring? It is black rubber, matching the color used across the Sierra gimbal housing O-ring line.

Is a UPC available for the 18-7168-9 pack? Yes, the Sierra 18-7168-9 O-ring pack carries UPC 808282165468.