Sierra 18-6503 - Rewind Spring
Sierra 18-6503 - Rewind Spring
Sierra
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Sierra 18-6503 - Rewind Spring
A rewind-spring repair starts with the correct spring for the starter assembly, not simply the engine brand. Sierra 18-6503 offers a separately listed replacement for Mercury 878898 and OMC/Johnson/Evinrude 318944, allowing you to select the spring by its established part reference. Confirm the assembly shown in your engine's parts diagram before choosing this component for starter service.
Part Specifications
- Part Number: 18-6503
- Component: Rewind spring
- Replaces Mercury: 878898
- Replaces OMC/Johnson/Evinrude: 318944
- Fitment Basis: Matching starter-assembly part reference; specific horsepower and model-year ranges are not established in this listing
Confirm Fitment Before Ordering
Use the parts diagrams available on our website to identify the rewind spring specified for your starter assembly. Alternatively, send us your engine model and serial number by email, text or live chat, and we'll confirm the correct part before you order.
Additional Information
- Vendor: Sierra
- Part Number: 18-6503
- OEM Cross-Reference: Mercury 878898; OMC/Johnson/Evinrude 318944
Installation Notes
Refer to the applicable engine service manual for safe handling of the spring under tension and the specified rewind-starter assembly and tensioning requirements.
Frequently Asked Questions
Q: Which original part numbers does Sierra 18-6503 replace?
A: The listed replacement references are Mercury 878898 and OMC/Johnson/Evinrude 318944; match the required spring number in your engine's parts diagram.
Q: Will this spring fit any Mercury, Johnson or Evinrude starter?
A: No universal fitment is established. The starter assembly must call for the listed replacement reference, and engine model and serial number should be checked before ordering.
Q: Is this a complete starter assembly?
A: This listing identifies the rewind spring as the service component. It does not establish that a starter housing, pulley, rope or handle is included.
Q: Can I select a replacement spring by its appearance alone?
A: Appearance alone does not confirm fitment, and this listing does not provide dimensions or attachment details. Use the parts diagram and original part number to identify the correct spring.
Q: What should I check before handling a rewind spring?
A: Consult the applicable service manual's precautions for stored spring tension before disassembling the starter; use qualified marine service assistance if you are unfamiliar with the assembly.
! 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.