Mercury MerCruiser Bravo Sterndrives Service Manual #28
Detailed service and repair procedures for Mercury MerCruiser Bravo Sterndrives. Includes Bravo One, Bravo Two, Bravo Three, and Diesel models. PN 90-863160
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Models Covered & Key Technical Specifications
Mercury Bravo Sterndrives 28 (90-863160) – Service Manual Sterndrive Unit Repair | Bravo Sterndrives Manual
- Drive Unit Gear Ratio Identification: 1.65:1 represents the standard gear ratio for Bravo One units.
- Propeller Shaft Components: Includes detailed exploded views for Bravo One and Diesel Bravo One X propeller shafts.
- Bearing Preloads: Drive shaft bearings require a preload of 3-5 lb-in (0.3-0.55 Nm) for proper operation.
- U-Joint Identification: Bravo Three sterndrives use a U-joint shaft marking of 'F' for a 1.50:1 ratio.
- Tools Required: A universal puller plate (91-37241) is essential for bearing removal procedures.
- Lubricants / Sealants / Adhesives: Quicksilver High-Performance Gear Lube is recommended for all bearing surfaces.
Manual Description & Preview
Mercury Bravo Sterndrives Service Manual #28: MerCruiser Sterndrive Unit Manual
Sterndrive Unit: Bravo Sterndrives // System: Drive Shaft Housing Logic // Details: Component Specifications
Specifications
| Assessment-Element | Diagnostic-Logic | Calibration-Spec |
|---|---|---|
| Driveshaft Pinion Screw Torque | 45 lb-in. (61 Nm) | 61 Nm |
| Bearing Carrier Retainer Nut | Torque to Proper Preload | Proper Preload |
| Drive Shaft Housing to Gear Housing Nuts | 35 lb-ft (48 Nm) | 48 Nm |
| Anodic Plate Screw | 23 lb-ft (32 Nm) | 32 Nm |
| Oil Fill/Drain Plug Torque | 40 lb-in. (5 Nm) | 5 Nm |
| Propeller Nut Torque | 55 lb-ft (75 Nm) | 75 Nm |
Table of Contents Summary
The service manual covers:
- Drive Shaft Housing Exploded View
- Bravo One Gear Housing Exploded View
- U-Joint and Pinion Gear Disassembly
- Bearing Carrier Reassembly
- Propeller Shaft Inspection
Component Overview
This manual provides comprehensive procedures for the disassembly, inspection, and reassembly of the Mercury Bravo Sterndrive units. It details specific components like the drive shaft housing, gear housing, propeller shaft, and the associated bearings and seals. The document includes exploded views and part numbers for various assemblies, aiding in correct identification and replacement. Proper torque specifications and lubrication guidelines are also documented to ensure correct component alignment retention and optimal performance.
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