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Inboard Marine Engine & Drive Parts For Mercruiser, Volvo, OMC, PCM
Shop inboard and sterndrive marine parts for maintenance, troubleshooting, repair, and full engine rebuild projects. This category includes OEM parts and quality OEM specification aftermarket products from Pro Marine for Mercruiser, Volvo, OMC, Crusader, Pleasurecraft, Indmar, and Chrysler marine engine applications.
Browse marine engine parts by brand and engine system, including cooling systems, ignition and electrical components, fuel delivery parts, exhaust components, internal engine parts, sterndrive and lower drive components, gaskets, seals, steering components, service kits, oil change kits, and rebuild parts.
Shop Inboard Categories
Mercruiser Engine Cooling, fuel, ignition, exhaust, and engine parts 
Mercruiser Drive Driveshaft housing, lower gearcase, transom, and trim parts 
Volvo Engine Volvo cooling, electrical, exhaust, and internal engine parts 
Volvo Drive Volvo drive housing, gearcase, transom, and trim components 
OMC Engine OMC fuel, cooling, electrical, exhaust, and engine parts 
OMC Drive OMC drive housing, lower gearcase, transom, and trim parts 
Crusader Engine Crusader cooling, fuel, ignition, exhaust, and engine parts 
Pleasurecraft Engine Pleasurecraft marine engine maintenance and repair parts 
Indmar Engine Indmar cooling, fuel, electrical, and engine components 
Chrysler Engine Chrysler marine engine maintenance and rebuild parts Common Inboard and Sterndrive Parts Found in This Category
- Water pumps, impellers, thermostats, manifolds, and cooling system parts
- Fuel pumps, carburetor kits, injectors, filters, and fuel delivery components
- Ignition coils, distributors, sensors, alternators, starters, and electrical parts
- Pistons, bearings, crankshafts, gaskets, seals, and engine rebuild components
- Bellows, gimbal bearings, shift cables, trim parts, and sterndrive components
- Exhaust manifolds, risers, couplers, and marine exhaust parts
- Oil change kits, filters, spark plugs, lubricants, and routine service items
Common Inboard and Sterndrive Problems and Where to Start
- Overheating: inspect impellers, water pumps, thermostats, manifolds, and cooling passages.
- Hard starting or rough idle: check ignition components, carburetor parts, fuel delivery systems, and sensors.
- Water intrusion into the drive: inspect bellows, seals, gimbal bearings, and sterndrive housing components.
- Loss of power or engine noise: inspect compression, bearings, gaskets, pistons, and internal engine components.
- Drive vibration or shifting issues: inspect couplers, shift cables, u-joints, gears, and lower drive components.
Frequently Asked Questions
What is the difference between OEM and aftermarket marine parts?
OEM parts are produced by the original engine manufacturer. Aftermarket parts are replacement parts produced by other manufacturers to fit the same application. Pro Marine provides quality OEM specification aftermarket products for marine maintenance, repair, and rebuild applications.
How do I find the correct inboard or sterndrive parts?
Use your engine model number, serial number, drive model, and horsepower information to confirm fitment. Sterndrive applications may also require the drive serial number for accurate parts matching.
What brands are included in this category?
This category includes Mercruiser, Volvo, OMC, Crusader, Pleasurecraft, Indmar, and Chrysler marine engine applications.
What are common signs my sterndrive needs service?
Common warning signs include overheating, water in gear lube, vibration, difficult shifting, drive noise, poor acceleration, bellows leaks, and excessive corrosion.
Are aftermarket sterndrive and inboard parts reliable?
Yes. Quality aftermarket marine parts are commonly used by marine mechanics and rebuilders. Pro Marine offers OEM specification aftermarket products for many marine engine and sterndrive repair applications.
Tip: Before ordering sterndrive or inboard parts, verify the engine model, serial number, and drive model information whenever possible.
881620001
0777130
0777826
18-3086
777130
777826
89760
9-45281
59564
72785
85810
22540
848147
99386
993861
Shift Shaft Bushing Assembly 65529
The 65529 Shift Shaft Bushing Assembly is a Sierra replacement component designed for MerCruiser Alpha One Gen II sterndrives. This assembly supports and seals the shift shaft where it passes through the drive housing, ensuring smooth shifting and proper sealing.
Fitment Overview
This bushing assembly replaces Mercury / MerCruiser part numbers 815921A2, 815921A6, 815921A8, 815921A10, 815921A17, and 815921A21.
These OEM numbers are used specifically on MerCruiser Alpha One Gen II sterndrives across multiple production years.
Compatibility
| Brand | Drive Model | Application |
|---|---|---|
| MerCruiser | Alpha One Gen II | Sterndrive |
| MerCruiser | Alpha One Gen II (various ratios) | Sterndrive |
Commonly used on Alpha One Gen II drives across a wide range of boat applications including runabouts, cruisers, and fishing boats.
Fits These Serial Ranges
Typical application includes Alpha One Gen II sterndrives within serial ranges such as:
- 0D469859 through later Alpha One Gen II production
Important: Always confirm fitment using your sterndrive serial number or OEM part number.
Looking for the OEM version of this part?
View OEM MerCruiser Shift Shaft Bushing Assembly
Part Numbers and Cross References
| Type | Part Number |
|---|---|
| Pro Marine | 65529 |
| Mercury / MerCruiser OEM | 815921A2 |
| Mercury / MerCruiser OEM | 815921A6 |
| Mercury / MerCruiser OEM | 815921A8 |
| Mercury / MerCruiser OEM | 815921A10 |
| Mercury / MerCruiser OEM | 815921A17 |
| Mercury / MerCruiser OEM | 815921A21 |
What This Part Is Used For
This assembly supports the shift shaft and provides sealing where it enters the sterndrive housing. It is critical for maintaining proper gear engagement and preventing water intrusion into the drive.
- Supports shift shaft alignment
- Seals shift shaft entry point
- Maintains smooth shifting operation
- Helps prevent water intrusion into the drive
A worn or damaged bushing can cause shifting issues, leaks, or internal drive damage.
System Function and Connections
- System Type: Sterndrive shifting system
- Component Type: Shift shaft bushing and seal assembly
- Location: Alpha One Gen II drive housing
FAQ
What does this part fit?
It fits MerCruiser Alpha One Gen II sterndrives.
Is this for outboard engines?
No, this part is used in sterndrives only, not outboard lower units.
What does this part replace?
It replaces 815921A2, A6, A8, A10, A17, and A21.
Why is this part important?
It ensures proper shifting and helps prevent water from entering the drive.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 (continental U.S.).
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1–5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Items must be new, unused, and in original packaging.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Part Numbers
65529, 815921A2, 815921A6, 815921A8, 815921A10, 815921A17, 815921A21, MerCruiser Alpha One Gen II shift shaft bushing
21015
815921A10
815921A17
815921A2
815921A21
815921A6
815921A8
19543A2
19543A4
19543A8
19543T1
19543T2
33981
33981T
33981T1
35187A1
35187A2
35187A4
41951A1
49518A1
66065A1
66069A2
73679A2
73723A01
73723A1
8M0176524
8M0176525
8507521
8507522
865436A02
865436A03
865509T