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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
19543A2
19543A4
19543A8
19543T1
19543T2
33981
33981T
33981T1
35187A1
35187A2
35187A4
41951A1
49518A1
66065A1
66069A2
73679A2
73723A 1
73723A01
73723A1
8M0176524
8M0176525
8507521
8507522
865436A02
865436A03
19543A2
19543A4
19543A8
19543T1
19543T2
33981
33981T
33981T1
35187A1
35187A2
35187A4
41951A1
49518A1
66065A1
66069A2
73679A2
73723A01
73723A1
8M0176524
8M0176525
8507521
8507522
865436A02
865436A03
9-72158
164591
164592
8M0185784
861175A1
861175A2
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
21420
45589A1
45589A3
45589A4
8M0184382
18-2154
21010
30617A1
30617A2
8M0112749
21031
8M0127949
815919A1
9-72477
0775537
18-2161
21140
45518A1
45518A2
45518A3
45518B2
45518B3
9-72153
18-2130
66062
76865
8M0226861
8M2009865
823903