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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.
866169T01
881633T01
881633001
895235
09-1028B
17937-0001
17937-0001-P
17937-0001P
179370001P
18-3038
18-3077
18-3077
18-30777
20799057
21422647
21951356
24139377
3838541
3841697
875593
877061
877061
877486
89550
MerCruiser Shift Shaft Bushing Assembly 65529-1 (OEM)
The 65529-1 Shift Shaft Bushing Assembly is a genuine Mercury MerCruiser OEM component designed specifically for Alpha One Gen II sterndrives. This assembly supports and seals the shift shaft where it enters the drive housing, ensuring precise shifting and proper sealing.
Fitment Overview
This OEM part replaces and supersedes earlier Mercury / MerCruiser part numbers including 815921A2, 815921A6, 815921A8, 815921A10, 815921A17, and 815921A21.
All of these part numbers correspond to the same shift shaft bushing assembly used in Alpha One Gen II sterndrive applications.
Compatibility
| Brand | Drive Model | Application |
|---|---|---|
| MerCruiser | Alpha One Gen II | Sterndrive |
| MerCruiser | Alpha One Gen II (all gear ratios) | Sterndrive |
This component is used in Alpha One Gen II drives across a wide range of marine applications.
Fits These Serial Ranges
Common applications include Alpha One Gen II sterndrives beginning approximately at serial range:
- 0D469859 and newer Alpha One Gen II production
Important: Always confirm compatibility using your sterndrive serial number or OEM part number.
Looking for a cost-effective aftermarket alternative?
View Pro Marine Shift Shaft Bushing Assembly 65529
Part Numbers and Cross References
| Type | Part Number |
|---|---|
| Mercury / MerCruiser OEM | 65529-1 |
| Mercury / MerCruiser OEM | 815921A2 |
| Mercury / MerCruiser OEM | 815921A6 |
| Mercury / MerCruiser OEM | 815921A8 |
| Mercury / MerCruiser OEM | 815921A10 |
| Mercury / MerCruiser OEM | 815921A17 |
| Mercury / MerCruiser OEM | 815921A21 |
| Aftermarket | 65529 (Pro Marine) |
What This Part Is Used For
This shift shaft bushing assembly supports the shift shaft and seals the entry point into the sterndrive housing. It ensures proper alignment and prevents water from entering the drive.
- Maintains shift shaft alignment
- Provides sealing at the drive housing
- Ensures smooth gear engagement
- Helps protect internal drive components
Using a genuine OEM part ensures proper fit, sealing, and long-term durability.
System Function and Connections
- System Type: Sterndrive shifting system
- Component Type: Shift shaft bushing assembly
- Location: Alpha One Gen II drive housing
FAQ
Is this a genuine Mercury part?
Yes, this is an OEM Mercury MerCruiser component.
What does this part fit?
It fits MerCruiser Alpha One Gen II sterndrives.
Does this replace older part numbers?
Yes, it replaces 815921A2, A6, A8, A10, A17, and A21.
Why choose OEM?
OEM parts are manufactured to exact specifications for proper fit and long-term reliability.
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
65529-1, 815921A21, 815921A10, 815921A8, 815921A6, 815921A2, MerCruiser Alpha One Gen II shift shaft bushing
21015
815921A10
815921A17
815921A2
815921A21
815921A6
815921A8
9-76136
881608001
864850A1
77100
818383T
861677T
