Mercury MerCruiser OEM Wear Pad 879346T30 | Alpha One Gen II Sterndrive Drive Components
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Mercury MerCruiser OEM Wear Pad — Part 879346T30
- Part Number: 879346T30
- Brand: Mercury Marine / MerCruiser (Genuine OEM)
- Official Product Type: Sterndrive & Drive Components — Wear Pad
- System: Sterndrive drive assembly — Alpha One Gen II drive components
- Function: Sacrificial wear surface — absorbs contact loads and friction between mating drive components, protecting surrounding structural parts from accelerated wear
- Application: Applicable MerCruiser Alpha One Gen II sterndrive drive assemblies where the Mercury parts diagram specifies 879346T30
- Weight: approx. 0.05 kg
Order by part number — not by appearance: Many Mercury MerCruiser wear pads are visually similar but differ in thickness, material, or profile. 879346T30 is a specific OEM part for the drive assembly position shown in your Mercury parts diagram. Confirm the part number from the diagram for your exact drive model and serial number before ordering.
What It Is
The 879346T30 is a genuine OEM wear pad for applicable MerCruiser Alpha One Gen II sterndrive drive assemblies. Wear pads are intentionally sacrificial components — they are designed to absorb the friction and contact loads between mating or moving drive parts so that the surrounding, more expensive structural components are protected. Replacing a worn pad at the first sign of wear is significantly less costly than allowing damage to spread to the adjacent drive components.
Compatible Applications
Confirm fitment by locating 879346T30 in the Mercury parts diagram for your specific MerCruiser Alpha One Gen II drive model and serial number before ordering.
- Verified application: MerCruiser Alpha One Gen II (1998 and newer), serial 0L100040 and up, where the Driveshaft Housing and Drive Gears diagram specifies 879346T30 for the starboard wear pad
Not sure it fits? Send us your MerCruiser drive model and serial number before ordering.
Part Numbers
- 879346T30 — Current Mercury / MerCruiser OEM wear pad
Confirm any superseding numbers from the current Mercury parts diagram for your drive. The T-suffix numbering indicates a current OEM configuration — do not substitute earlier or unverified part numbers.
When to Replace
Inspect or replace the wear pad when:
- The pad surface is visibly worn, grooved, cracked, or thinned beyond the service limit
- Unusual noise, vibration, or roughness develops in the drive assembly during operation
- The Mercury service manual calls for wear pad inspection or replacement during a scheduled drive service
- The surrounding drive assembly is disassembled for major service — inspect the pad and replace if there is any doubt about its condition
- Adjacent mating surfaces show wear patterns indicating the pad has been operating beyond its service life
Service Interval
Follow the Mercury MerCruiser service manual for the specific Alpha One Gen II drive assembly interval. Wear pads in sterndrive drive components are typically inspected during drive gear lube service, annual drive service, or whenever the drive is disassembled. Because 879346T30 is an inexpensive sacrificial part, replacing it whenever the assembly is apart for other service — rather than waiting for visible wear — is a practical approach to avoid a second disassembly.
Installation Notes
- Confirm 879346T30 is the correct part number from the Mercury parts diagram for the specific Alpha One Gen II drive model and serial number before installation
- Clean all mating surfaces thoroughly before fitting the replacement wear pad — debris or old pad material on the mating face can cause premature wear or improper seating
- Inspect the adjacent mating components for wear, scoring, or damage caused by the failed or worn pad — a worn pad that was left in service too long may have allowed damage to the surrounding parts
- Follow the applicable Mercury Alpha One Gen II drive service manual for installation sequence, orientation, and any torque specifications that apply to the surrounding assembly
- Verify smooth drive operation after reassembly before returning to service
Technical FAQ
Q: Can I order this wear pad by appearance or size rather than by part number?
No. Many Mercury MerCruiser wear pads are visually similar but differ in thickness, material composition, or edge profile for specific assembly positions. Always order by the exact part number shown in the Mercury parts diagram for the drive being serviced — substituting by appearance risks incorrect fit or premature failure.
Q: Do I need to replace the wear pad every time I service the drive?
Not necessarily, but the pad should be inspected whenever the assembly is disassembled. Because 879346T30 is an inexpensive part relative to the surrounding drive components it protects, replacing it at each major drive service rather than waiting for visible failure is a sound preventive practice on Alpha One Gen II drives.
Q: What happens if I ignore a worn wear pad?
A worn or missing wear pad allows direct metal-to-metal contact between the mating drive components it was protecting. This can cause accelerated wear, scoring, or damage to those parts — turning what would have been an inexpensive pad replacement into a significantly more costly drive component repair or replacement.
Q: Is there a left-hand and right-hand version of this wear pad?
Some MerCruiser drive assemblies use both a standard and a left-hand wear pad in the same assembly. Confirm from the Mercury parts diagram whether your specific drive requires 879346T30 alone or both 879346T30 and a companion pad. See the related part below for the left-hand wear pad reference.
Related Parts
Parts Desk Insights
The most common ordering issue with 879346T30 is customers ordering by visual match rather than by the part number in their diagram — Alpha One Gen II drive wear pads can look nearly identical but differ in critical dimensions. The second most common scenario is discovering that the old pad wore through and caused damage to the mating drive surface; inspecting the contact face of the adjacent component before reassembly is worth the extra few minutes to avoid a repeat repair. Also worth noting: some Alpha One Gen II drive assemblies use both a standard and a left-hand pad in the same position, so checking whether a companion left-hand pad is also required before closing out the order is a useful habit.
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.
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Item must be in new, unused condition
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Important:
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