MerCruiser Bravo One, Bravo Two, and Bravo Three Sterndrives Service Manual #11 1990-1998 ( P/N 90-17431-4)

• Covers 1990–1998 MerCruiser Bravo sterndrive units, including Bravo One, Two, and Three variants
• Official Mercury Marine publication P/N 90-17431-4, March 1998 edition
• Contains 596 pages outlining component breakdown, removal, installation, and adjustment parameters
• Features 124 exploded-view diagrams paired with specialized torque tables for transom and gear housing hardware
• Serves as the primary reference for Bravo series sterndrive service, component replacement, and system maintenance

Component and System Documentation

Navigating a major sterndrive overhaul requires precise, organized information. This 1998 Mercury Marine publication segments technical data into logical component groups to keep your workspace efficient. It kicks off with essential general information, maintenance schedules, and troubleshooting charts before diving deep into the hardware. Section 3 specifically breaks down drive shaft and gear housing data for the Bravo One, Two, and Three models. You will find thorough outlines for disassembly, inspection, and the critical shimming procedures needed to maintain proper gear mesh. Later chapters tackle transom assembly maintenance, power trim systems—including specifics on Oildyne trim pumps—and advanced steering system calibration. Before beginning any drivetrain work, always review the designated safety protocols to prevent personal injury or equipment damage.

Technical Data and Service Highlights

Shop-level service demands exact specifications, and this manual delivers the baseline data required for both heavy line repairs and periodic maintenance. It details torque values for all primary fasteners, noting the critical 20–25 lb. ft. (27–34 N·m) requirement for transom assembly hardware. Fluid capacity tables provide specific volume measurements geared toward different gear lube monitor configurations. Mechanics relying on precise tolerances will appreciate the documented reference values, such as the 3–5 lb. in. (0.3–0.8 N·m) bearing preload required for accurate gear housing assembly. Furthermore, the electrical sections supply power trim wiring diagrams across multiple configurations, enabling faster diagnostic work.