Sierra 18-21753 Engine Coupler, White, Replaces OMC 3853862 / Volvo 3853862-5, Fits Volvo Penta 50L & 58L (1989-1996)

The Sierra 18-21753 is a white engine coupler engineered as a direct-fit replacement for Volvo Penta 50L and 58L engines built between 1989 and 1996. The coupler connects the engine output to the drive system, transmitting rotational power while accommodating the slight misalignment inherent in the coupling joint. It is built to Sierra's OEM specification standard, so it installs the same way as the original coupler it replaces and restores proper power transfer between the engine and drive unit.

This coupler is a direct cross-reference match for the OMC 3853862, Volvo 3853862-5, and 985727 part numbers, making it a straightforward swap for boat owners and marine technicians replacing a worn, cracked, or failed original coupler. Because a coupler is a wear item subject to constant torque and vibration loads, replacing it with a part built to OEM spec helps ensure reliable engine-to-drive power transmission and reduces the risk of premature failure from an ill-fitting substitute.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-21753
• Color: White
• Weight: 6.57 pounds
• Compatible Engines: Volvo Penta 50L & 58L (1989-1996)
• OEM Cross Reference: OMC 3853862, Volvo 3853862-5, 985727
• UPC: 808282186388

Fitment

• Volvo Penta 50L (1989-1996)
• Volvo Penta 58L (1989-1996)

Replaces (OEM)

• OMC 3853862
• Volvo 3853862-5
• 985727

Frequently Asked Questions

What engines does the Sierra 18-21753 engine coupler fit? The Sierra 18-21753 fits Volvo Penta 50L and 58L engines built from 1989 to 1996.

What OEM part numbers does the 18-21753 replace? It cross-references to OMC 3853862, Volvo 3853862-5, and 985727, so any of those OEM numbers point to this same coupler.

What color is the Sierra 18-21753 engine coupler? It is finished in white, matching the original equipment coupler it replaces.

How much does the 18-21753 engine coupler weigh? The Sierra 18-21753 weighs 6.57 pounds.

Is the Sierra 18-21753 a genuine OEM part or an aftermarket replacement? It is a Sierra-manufactured replacement built to OEM specification, sold under the Sierra 18-21753 part number rather than under the original OMC or Volvo part numbers.

Will this coupler work if my engine data plate lists OMC 3853862? Yes, the Sierra 18-21753 is the direct cross-reference replacement for OMC 3853862.

Does the 18-21753 also replace Volvo Penta part 985727? Yes, 985727 is one of the OEM numbers this Sierra coupler replaces.

What does the engine coupler do? The 18-21753 connects the engine output to the drive system, transferring rotational power while accommodating minor misalignment at the coupling joint.

Is installation of the 18-21753 the same as the original coupler? Yes, since it is built to OEM specification and matches the original OMC 3853862 / Volvo 3853862-5 coupler, it installs using the same mounting arrangement.

What is included when I order the Sierra 18-21753? The order includes one Sierra 18-21753 white engine coupler.

Does this coupler fit engines outside the 1989-1996 range? The Sierra 18-21753 is specified for Volvo Penta 50L and 58L engines from 1989 to 1996; fitment outside that range is not confirmed.