Description
Mercury 47397A1 Forward Gear Shim Set 15-47397A1
The Mercury 47397A1 Forward Gear Shim Set is used for bearing outer race adjustment in compatible Mercury, Mariner, and MerCruiser gear housing applications. Also referenced as 15-47397A1, this shim set is designed for forward gear setup during gearcase service, lower unit repair, and stern drive gear housing maintenance where this exact part number is specified.
Key Features
- Genuine Mercury forward gear shim set
- Part number: 47397A1
- Mercury part reference: 15-47397A1
- Product type: Forward gear bearing outer race shim set
- Used for forward gear bearing outer race adjustment
- Shim sizes include .002, .003, .005, and .010
- Fits select Mercury and Mariner outboard gear housing applications
- Fits select MerCruiser Alpha, MR, SS, and Alpha One Gen II stern drive applications
- Supports proper gear setup during service, repair, or rebuild
Fitment / Product Details
- Brand: Mercury
- Part Number: 47397A1
- Mercury Part Reference: 15-47397A1
- Product Type: Shim set / bearing outer race shim set
- Application: Forward gear bearing outer race shim adjustment for compatible outboard and stern drive gear housings
- Engine Types: Select Mercury and Mariner 2-stroke, carbureted, EFI, DFI, Pro Max, Pro XS, Sport XS, XRI, XR2, XR6, Magnum III, Jet, and MerCruiser stern drive applications where specified
- HP Range: Select 105 Jet through 300HP outboard applications, plus compatible MerCruiser stern drive applications
- Assembly Location: Forward gear / bearing outer race / gear housing assembly
- Shim Sizes: .002, .003, .005, and .010
- Supersedes: 35931A1
- Fitment Note: Match part number 47397A1 or 15-47397A1 to your gear housing parts diagram, outboard model, drive model, serial number, and service manual before ordering.
Expanded Outboard Fitment
- Mercury / Mariner 105 Jet: Select gear housing applications where 15-47397A1 is specified
- Mercury / Mariner 140 Jet: Select gear housing applications where 15-47397A1 is specified
- Mercury / Mariner 135HP: Select V6 2-stroke gear housing applications
- Mercury / Mariner 150HP: Select 2.4L and 2.5L carbureted, EFI, XR2, XR6, and Magnum III applications
- Mercury / Mariner 175HP: Select 2.4L and 2.5L carbureted, EFI, XRI, Magnum, and Pro XS applications
- Mercury / Mariner 200HP: Select 2.4L, 2.5L, EFI, XRI, Pro Max, Super Magnum, DFI, and Pro XS applications
- Mercury 225HP: Select 3.0L EFI, DFI, Pro Max, 225X, 225XS, and Sport XS applications
- Mercury 250HP: Select 3.0L EFI, DFI, Pro XS, 250XS, Sport XS, and related performance applications
- Mercury 300HP: Select 3.0L EFI, 300X, 300XS, and Pro Max applications
- Gearcase Applications: Select standard rotation and performance gear housing applications where 47397A1 is specified
Expanded Sterndrive Fitment
- MerCruiser IA / IB / IC & EZ Shift: 1964-1966, serial range 1684188 through 2065186
- MerCruiser 120 / 140: 1967, serial range 2062141 through 2187468
- MerCruiser MR / Alpha One: 1984-1990, serial range 6225577 and up
- MerCruiser MR / Alpha One Counter Rotation: 1983-1990, serial range 6225577 and up
- MerCruiser Alpha One SS: 1986-1989, serial range 0A545004 and up
- MerCruiser Alpha One Gen II: 1991-1995, serial range 0D469859 through 0F679999
- MerCruiser Alpha One Gen II Counter Rotation: 1991-1995, serial range 0D469859 through 0F679999
Why You Should Buy
- Correct shim set for applications requiring Mercury 47397A1 or 15-47397A1
- Designed for forward gear bearing outer race adjustment
- Useful for gear housing service, lower unit repair, and forward gear setup
- Fits select Mercury outboard and MerCruiser stern drive applications
- Helps support accurate gear setup when installed according to service specifications
Common Applications
- Mercury and Mariner outboard gear housing service
- Forward gear bearing outer race adjustment
- Lower unit repair and rebuilds
- Mercury 105 Jet through 300HP outboard applications where specified
- Mercury Pro Max, Pro XS, XRI, XR2, XR6, Magnum III, and performance gearcase applications where specified
- MerCruiser MR / Alpha One gear housing service
- MerCruiser Alpha One SS gear housing service
- MerCruiser Alpha One Gen II and Gen II counter rotation gear housing service
FAQ
- What is Mercury 47397A1? Mercury 47397A1 is a forward gear bearing outer race shim set used in compatible Mercury, Mariner, and MerCruiser gear housing applications.
- Is 15-47397A1 the same part? Yes. 15-47397A1 is the Mercury part reference for this shim set.
- What does this shim set adjust? This shim set is used to adjust the forward gear bearing outer race in compatible gear housing assemblies.
- What shim sizes are included? The shim set includes .002, .003, .005, and .010 shim sizes.
- What horsepower range does this fit? This shim set fits select Mercury and Mariner 105 Jet through 300HP outboard applications where 47397A1 is specified.
- What engine types does this fit? This part fits select 2-stroke, carbureted, EFI, DFI, Pro Max, Pro XS, Sport XS, XRI, XR2, XR6, Magnum III, Jet, and related Mercury / Mariner gear housing applications.
- Does this fit MerCruiser Alpha One Gen II? Yes. This shim set fits select Alpha One Gen II and Alpha One Gen II counter rotation applications from 1991-1995 with serial range 0D469859 through 0F679999.
- What part number does this supersede? Mercury 47397A1 supersedes 35931A1.
- How should I confirm fitment? Match part number 47397A1 or 15-47397A1 to your gear housing parts diagram, outboard model, drive model, serial number, and service manual before ordering.