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⚓ Seal your power with confidence — don’t let leaks sink your ride!
The Sierra 18-3899 Marine Cover Gasket is a precision-machined, OEM-quality replacement part designed for 20-35 HP Johnson/Evinrude outboard motors. Engineered to withstand harsh marine environments, it ensures a perfect, leak-free seal backed by Sierra’s top-tier warranty and trusted by professionals for reliable, long-term performance.
| ASIN | B001IV030M |
| Best Sellers Rank | #511,500 in Automotive ( See Top 100 in Automotive ) #711 in Powersports Engine Gaskets |
| Brand | Sierra |
| Customer Reviews | 4.6 4.6 out of 5 stars (116) |
| Date First Available | October 20, 2008 |
| Exterior | Machined |
| Global Trade Identification Number | 00808282244118 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.317 ounces |
| Item model number | 18-3899 |
| Manufacturer | Sierra |
| Manufacturer Part Number | 183899 |
| Model | Water Cover Gasket |
| OEM Part Number | OMC 327674 |
| Product Dimensions | 0.39 x 0.39 x 0.39 inches |
| Shape | Round |
| UPC | 808282244118 |
| Unit Count | 1.0 Count |
P**T
35 hp
Gasket lined up and fit perfectly on 1979 Johnson 35hp. No leaks. I’m very happy and shipping was on time as projected. Thank you.
J**3
Worked great!
No leaks even with two snapped off bolts. Be careful when removing the bolts, i was working on an engine that sat for 20 years, sprayed the bolts with blaster for 2 days and still rung off two bolts.
W**K
Perfect fit....
Fit was perfect. Problem solved!
S**7
quality
matched cover. have not used as yet do to another part "no show"
A**N
great deal
great product and fast shipping when you have prime. worked out great and had my motor up and running again.
I**S
Fit like perfectly
Fit my 91' Johnson 30hp perfectly. Don't forget the sealant.
J**A
As described
Husband seemed pleased. Hasn't asked me to send back! Must have been a correct description
J**E
Thin, very thin, poor quality for sure.
The cut out for one, is not clean nor precise. And so thin, wow a very crap gasket and quality.
F**E
Super utilisation personnel
L**T
Parfait ! Livraison dans les temps, colis bien protégé et joint identique à l'original ! Parfait !
A**E
The right gasket for my motor and it shipped quick.
Trustpilot
1 day ago
1 month ago