Sierra 18-7178 - O-Ring
Sierra 18-7178 - O-Ring
Sierra
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Sierra 18-7178 - O-Ring
When your assembly's parts reference specifies Sierra 18-7178, this separately listed O-ring provides a focused seal-replacement option. Order by the required part number rather than appearance: the source listing does not identify a particular engine family, seal location or dimensional specification. Confirming those details before purchase helps avoid choosing a similar-looking ring intended for a different assembly.
Part Specifications
- Part Number: 18-7178
- Component: O-ring
- Selection Reference: Sierra 18-7178; confirm the required seal against the applicable parts diagram
Confirm Fitment Before Ordering
Use the parts diagrams available on our website to identify the O-ring required for your assembly. Alternatively, send us your engine model and serial number by email, text or live chat, and we'll confirm fitment before you order; include the drive model and serial number if the seal is for a stern-drive assembly.
Additional Information
- Vendor: Sierra
- Part Number: 18-7178
Installation Notes
Refer to the applicable engine or drive service manual for the correct seal location, preparation requirements and assembly specifications.
Frequently Asked Questions
Q: What are the inside diameter and cross-section of Sierra 18-7178?
A: Those dimensions are not provided in this listing. Confirm the required part number rather than selecting this seal by an assumed size.
Q: What material is the O-ring made from?
A: The material is not established in the source product details, so a specific elastomer or fluid-resistance rating is not claimed.
Q: Which engine or drive does it fit?
A: A specific engine or drive application is not established here. Send us the model, serial number and seal location by email, text or live chat so we can verify the required part.
Q: Does Sierra 18-7178 replace an OEM part number?
A: No OEM replacement reference is confirmed in this listing. Check the applicable parts diagram or contact us before treating it as a substitute for another numbered seal.
Q: Is this a complete seal kit?
A: This listing identifies an O-ring, not a complete seal kit. Additional seals or service components are not confirmed as included.
! 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.