Crowley Marine: serving boaters for over 50 years Crowley Marine: serving boaters for over 50 years
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Piston Ring Set 39-21665A12

Satisfaction rating 5 out of 5 (3 Ratings)
Save $2.83 (5%)
Leaves in 3-5 days

This product will be cross shipped from one of our secondary warehouses. Please note the additional handling time.

Last update: 85 days ago Update Now

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  • This is an OEM part manufactured by Mercury Marine
  • Flat rate shipping starting at $3.95
  • 30 day return policy

Product Description

Mercury factory part. Search for more factory parts & parts diagrams.

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3 Product Reviews

Mercury 7.5 hp 1984

Repair Difficulty
Repair Time
More than 4 hours
All parts fit as expected

Problem fixed: Replace piston rings and water pump

Low compression from running hot, replaced rings and water pump.

good parts information that displays well and they ship to Canada.

mercury 7.5 hp ,1983y


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Aftermarket Product Interchange

Name SKU Price Brand
Piston Rings 18-3900 $37.49 Sierra Marine
Due to manufacturer policy OEM Mercury products can only be shipped to addresses within the United States.

Flat $3.95 Shipping on ALL parts orders

We offer shipping flat $3.95 shipping on ALL parts orders. (Complete Engines, Lower Units and Sterndrives excluded). In addition orders over $89 have reduced cost express shipping available in checkout.

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