Sierra 18-2794-1 - Yamaha Lower Unit Seal Kit
Sierra 18-2794-1 - Yamaha Lower Unit Seal Kit
Sierra
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Sierra 18-2794-1 - Yamaha Outboard Lower Unit Seal Kit
The Sierra 18-2794-1 lower unit seal kit is an aftermarket replacement for applicable Yamaha outboard gearcases. It cross-references six Yamaha seal kit numbers, along with Mallory 9-74539 and earlier Sierra 18-2794 and 18-2795 kits. These replacement references make it easier to identify the appropriate kit for gearcase resealing without relying on engine brand alone. Confirm the installed lower unit and its specified seal kit before ordering.
Part Specifications
- Part Number: 18-2794-1
- Component: Lower unit / gearcase seal kit
- Listed application: Applicable Yamaha outboard lower units
- Replaces Yamaha: 6E5-W0001-F1-00, 6E5-W0001-51-00, 6F3-W0001-C1-00, 6G5-W0001-C1-00, 6G5-W0001-21-00 and 6F3-W0001-21-00
- Replaces Sierra: 18-2794 and 18-2795
- Aftermarket cross-reference: Mallory 9-74539
Confirm Fitment Before Ordering
Use the parts diagrams available on our website to help identify the correct Yamaha lower unit seal kit. Alternatively, send us your engine model and serial number by email, text or live chat, and we will confirm fitment before ordering. If the lower unit has been replaced, include its identification details so we can check the installed gearcase.
Additional Information
- Vendor: Sierra
- Part Number: 18-2794-1
- OEM Cross-Reference: Yamaha 6E5-W0001-F1-00, 6E5-W0001-51-00, 6F3-W0001-C1-00, 6G5-W0001-C1-00, 6G5-W0001-21-00 and 6F3-W0001-21-00
Installation Notes
Refer to the applicable Yamaha engine and gearcase service manual for lower unit seal replacement requirements and specifications.
Frequently Asked Questions
Q: What is Sierra 18-2794-1 used for?
A: It is a replacement lower unit seal kit for applicable Yamaha outboard gearcases using one of the listed seal kit cross-references.
Q: Does it replace Yamaha 6E5-W0001-F1-00?
A: Yes. That number is a listed replacement reference, along with 6E5-W0001-51-00, 6F3-W0001-C1-00, 6G5-W0001-C1-00, 6G5-W0001-21-00 and 6F3-W0001-21-00. Verify your gearcase application before ordering.
Q: Does this kit replace Sierra 18-2794 and 18-2795?
A: Yes. Both earlier Sierra part numbers are listed replacement references for 18-2794-1.
Q: Is Mallory 9-74539 a listed interchange?
A: Yes. Mallory 9-74539 is the listed aftermarket cross-reference.
Q: Will this fit every Yamaha outboard lower unit?
A: No universal fit is specified. Check the applicable parts diagram or send your engine model, serial number and any replacement gearcase details by email, text or live chat for confirmation before ordering.
! Compatibility references are provided for informational purposes only and do not constitute a fitment guarantee. Part numbers, application listings, and "replaces" cross-references are based on manufacturer data and are intended as a starting point for identification — not a guarantee of fit for your specific engine, hull, or installation.
Buyer is solely responsible for verifying compatibility with their engine model, serial number, model year, and trim configuration before purchase. If you are unsure whether this part fits your application, contact MacombMarineParts.com before you buy — we're available via text, email, or online chat to help verify compatibility for your specific application.
MacombMarineParts.com is not liable for parts ordered based on assumed fitment. Returns due to buyer-selected incorrect fitment are subject to our standard return and restocking fee policies.