Winter Boat Upgrade Event

Sierra Engine Coupler For Mercury Marine Engine, Sierra Part #18-2172

Item # 327048
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Ships within 5 - 6 business days

Additional Information:
  • Additional discounts do not apply.


  • Sierra Part #18-2172

  • Engine coupler

  • For Mercury Marine engine

Product Summary 

Sierra engine coupler for Mercury Marine engine. Used when replacing V6 or V8 rear main seal with 3-1/2" crankshaft bolt pattern to a newer 1-piece rear main seal with 3" pattern. Sierra Part #18-2172.

OEM Part Number: