Sierra 18-2765 U-Joint Bellows for Volvo Penta DP-S, SX Stern Drives, Replaces 3854127

The Sierra 18-2765 U-Joint Bellows is a direct-fit replacement bellows designed for Volvo Penta DP-S and SX stern drives. It seals the universal joint area of the drive, keeping water out of the u-joint and gimbal housing while allowing the drive's flexing movement needed for steering and trim. Over time the original rubber bellows on a stern drive hardens, cracks, or splits from age and exposure to water and fuel residue, which lets water intrude into the u-joint housing and leads to corrosion and premature bearing failure. Replacing a failed bellows with the 18-2765 restores the watertight seal and helps protect the u-joint and gimbal bearing from water damage.

This bellows is also used as the replacement Bellows component within Sierra's u-joint/gimbal bearing service kit, alongside a Gimbal Bearing (Sierra 18-2100, O.E. 3853807) and a second Bellows (Sierra 18-1074), for a complete u-joint area reseal. The 18-2765 corresponds to O.E. Part number 3854127.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2765
• Product Type: U-Joint Bellows
• Fits Drive Models: DP-S, SX
• Weight: 0.83 pounds
• UPC: 030999313058
• Unit Count: 1

Fitment

• Volvo Penta DP-S stern drive
• Volvo Penta SX stern drive

Replaces (OEM)

• 3854127

Frequently Asked Questions

What does the Sierra 18-2765 U-Joint Bellows fit? The 18-2765 is designed for Volvo Penta DP-S and SX stern drives, sealing the u-joint area of those drives.

What OEM part number does the 18-2765 replace? It replaces OEM part number 3854127 on applicable Volvo Penta DP-S and SX stern drives.

How much does the 18-2765 U-Joint Bellows weigh? The Sierra 18-2765 U-Joint Bellows weighs 0.83 pounds.

How many bellows come in one package? One Sierra 18-2765 U-Joint Bellows is included per unit, with a unit count of 1.

Why does a u-joint bellows need to be replaced? A bellows like the 18-2765 seals the u-joint housing against water intrusion; once the original bellows cracks or hardens with age, water can reach the u-joint and gimbal bearing and cause corrosion, so replacement with 18-2765 restores the seal.

Is the 18-2765 bellows part of a larger service kit? Yes, the 18-2765 Bellows is used as a component within a u-joint and gimbal bearing service kit that also includes a Sierra 18-2100 Gimbal Bearing (O.E. 3853807) and a Sierra 18-1074 Bellows.

What is the UPC for the Sierra 18-2765? The UPC for the Sierra 18-2765 U-Joint Bellows is 030999313058.

Does the 18-2765 fit both DP-S and SX drives the same way? Yes, the same Sierra 18-2765 Bellows fits both the Volvo Penta DP-S and SX stern drive models.

Is the Sierra 18-2765 an OEM or aftermarket part? The Sierra 18-2765 is an aftermarket bellows manufactured to replace OEM part number 3854127 on Volvo Penta DP-S and SX drives.

Can I replace just the bellows without replacing the gimbal bearing? Yes, the 18-2765 is sold as an individual Bellows and can be installed on its own, though it is also compatible for use alongside the 18-2100 Gimbal Bearing when servicing the full u-joint area.