MerCruiser Bravo Sterndrives Service Manual #11 (1990-1998)

This comprehensive MerCruiser Bravo Sterndrives service manual covers models Bravo One, Bravo Two, and Bravo Three from 1990-1998. Includes detailed instructions for disassembly, inspection, and assembly. PN 90-17431-4.

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Document Details

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Document Number / Seller:
31527 / David Taylor
File Size:
11.93 MB
File Type:
PDF
Language:
English
Pages:
596
Printable:
Yes
Category:
Inboard Engine (Sterndrive)
Last updated / verified
Apr 14, 2025

Models Covered & Key Technical Specifications

MerCruiser Bravo Sterndrives (1990-1998) (90-17431-4)

Bravo Sterndrives / Service & Repair Reference: Bravo One, Bravo Two, Bravo Three

  • Verified Tolerance Values: 20-25 lb. ft. (27-34 N·m) is the specified torque for transom assembly attaching screws and nuts.
  • Key Interference Fit: 3-5 lb. in. (0.3-0.8 N·m) is the specified rolling preload for new driveshaft bearings.
  • Prescribed Electrical Load: Not specified in manual section.
  • Nominal Production Rate: Not specified in manual section.
  • Design Imaging Specs: Not specified in manual section.
  • Designated Clearance Data: 1/8 in. (3 mm) is the specified tolerance for parallel transom surfaces.

Professional Workshop Service Manual & Technical Specifications

MerCruiser Bravo Sterndrives Service Manual #11 (1990-1998)

Engineering-Metrics: MerCruiser Bravo Sterndrives // Model-Portfolio: Bravo One, Bravo Two, Bravo Three / Sterndrive Logic // Series-Validation: Manual #11 (1990-1998)

Service-Nexus Value Framework
Torque Specifications 20-25 lb. ft. (27-34 N·m) For transom assembly attaching screws and nuts
Lubricants/Sealers/Adhesives Quicksilver 2-4-C Marine Lubricant with Teflon For various lubrication points
Special Tools U-joint Bearing Retainer Wrench For removing bearing carrier retainer nut

Maintenance hierarchies are structured into:

  • Section 1: General Information (Important Info, Maintenance, Troubleshooting)
  • Section 2: Removal, Installation and Adjustments (All Models)
  • Section 3: Sterndrive Unit (Drive Shaft Housing, Bravo One/Two/Three Gear Housing)
  • Section 4: Transom Assembly (Minor and Major Disassembly Procedures)
  • Section 5: Power Trim (Oildyne Trim Pump, Trim Cylinders, Dual Power Trim System, Auto Trim II)
  • Section 6: Steering Systems (Power Steering)
  • Section 7: Corrosion Protection (All Models)
  • Section 8: Accessories

Reference data is included for the Bravo Sterndrive units, covering specifications, special tools, and lubricants. This manual covers the disassembly and reassembly of drive shaft and pinion gear components, including bearing inspection and U-joint procedures. It also details the gear housing disassembly and reassembly for Bravo One, Bravo Two, and Bravo Three models. Diagnostic procedures are covered for power trim systems and steering systems. Wiring diagrams are provided for the Auto Trim II system. Torque specifications are listed for various components to ensure proper assembly and function.

FAQ

What **essential** testing parameters are included for the power trim system? keyboard_arrow_down

20 amp fuses are specified for the power trim system's electrical components, with procedures to check for blown fuses and voltage at specific terminals.

Check the **correct** procedure for propeller shaft bearing removal. keyboard_arrow_down

A slide hammer puller (91-34569A1) along with a Snap-On adaptor and puller head (CG-40-4, CG-40-A10) is used for propeller shaft bearing removal.

What does the **documented** fluid capacity requirements state? keyboard_arrow_down

88 to 112 fluid ounces are the documented oil capacities for Bravo One, Bravo Two, and Bravo Three drive units, depending on the gear lube monitor type.

Reference the **precise** component identification for Bravo One gear housings. keyboard_arrow_down

1656-8865C or 1656-8865C1 are the precise casting numbers for early style Bravo One gear housings, with 1656-8866A11 being the service replacement part number.

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Reviews (2)

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New
I found this manual incredibly helpful. It covers everything you need to know about maintenance and repairs. The support team was very responsive when I had a question about the download link. Great service!
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New
This manual is a must-have for anyone working on MerCruiser Bravo sterndrives. The detailed instructions and diagrams made the repair process straightforward. Plus, I received my download link almost instantly!