Quicksilver 8M0214919 Upper Driveshaft O-Ring | Mercury MerCruiser OEM — 5-Pack (Replaces 30613)
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Part Details
- Part Number (Current): 8M0214919
- Part Number (Previous): 30613 / 25-30613
- Brand: Quicksilver / Mercury Marine (Genuine OEM)
- Official Product Type: Upper Driveshaft O-Ring
- System: Gear housing — upper driveshaft sealing
- Package Quantity: 5 O-rings
- GTIN (30613 ref): 745061134492
What This Part Is
Quicksilver 8M0214919 (previously catalogued as 30613 / 25-30613) is the genuine OEM upper driveshaft O-ring used in selected Mercury outboard and MerCruiser gear-housing assemblies. It is positioned around the upper section of the driveshaft in the gear housing and is identified in factory parts breakdowns as the upper driveshaft O-ring, distinct from the nearby shift-shaft O-ring and water-pump-base O-ring. This listing contains 5 O-rings.
Compatible Applications
Mercury parts catalogs show 30613 / 8M0214919 in numerous gear-housing configurations. Documented applications include selected:
- Mercury 650 4-cylinder gear housing
- Mercury 700 6-cylinder gear housing
- Mercury 800 / 80-series gear housing
- Additional Mercury outboard gear-housing assemblies
- Selected MerCruiser sterndrive gear-housing assemblies
Some applications are serial-number specific. Always confirm 8M0214919 or 30613 in the parts diagram for the exact engine or drive serial number before ordering. Do not select by O-ring appearance alone — similar assemblies can use different seals depending on production range.
Diagram Position
In the applicable lower-unit diagrams, 8M0214919 is specifically identified as the upper driveshaft O-ring, typically positioned near the driveshaft slinger ring, water-inlet guide sleeve, and upper water-pump components. Inspect all surrounding components during service.
When to Replace
Replace the upper driveshaft O-ring whenever the surrounding assembly is dismantled, or if the seal shows:
- Flattening or permanent compression set
- Cracking or hardening
- Cuts or installation damage
- Swelling or distortion
- Loss of elasticity
- Damage discovered during water-pump or gear-housing service
A disturbed O-ring should always be replaced — never reinstall a seal that has been removed from service.
Installation Notes
- Clean the O-ring groove and all mating surfaces before fitting the new seal
- Inspect the driveshaft area for corrosion, scoring, or debris that could damage the replacement O-ring
- Lubricate the O-ring with the lubricant specified in the applicable Mercury service procedure
- Avoid stretching, twisting, or pinching the seal during installation
- Ensure the O-ring is fully seated in its groove before reassembly
- While this area is open, also inspect the driveshaft slinger ring, water-inlet guide sleeve, and water-pump components
Cross-Reference Part Numbers
- Mercury / Quicksilver (current): 8M0214919
- Mercury / Quicksilver (previous): 30613 / 25-30613
- GTIN (30613 ref): 745061134492
Related Parts
- Browse Mercury MerCruiser / Quicksilver Gaskets & Seals for all sealing components
- Browse Marine Gaskets, Seals & O-Rings
Parts Desk Insights
Best use case: The 5-pack format works well for a complete lower-unit service or water-pump rebuild where multiple seals are being replaced in the same job. Replacing the upper driveshaft O-ring any time this section of the gear housing is open adds virtually no cost and eliminates a common source of water intrusion or gear-lube contamination after reassembly.
Common issue: The most frequent ordering error is confusing the upper driveshaft O-ring (8M0214919 / 30613) with other nearby seals in the same lower-unit assembly — in particular the shift-shaft bushing O-ring (25439) or the water-pump-base O-ring (33145 / 8M0214923). These seals appear close together in the parts diagram and can look similar, but they are not interchangeable. Always match by the specific diagram position and part number for your engine or drive serial number.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
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