Mercury MerCruiser 262 CID (4.3L) Inboard Engine Service Manual (P/N 90-861328-1)

• Official Mercury Marine publication (Part Number 90-861328--1, issued November 1999) covering 1999 MerCruiser 262 CID (4.3L) engines.
• Supports 4.3L, 4.3LH, and 4.3L EFI configurations paired with Alpha and Bravo sterndrive systems.
• Features 47 exploded-view diagrams, 12 wiring schematics, and complete torque specification tables.
• Serves as the primary reference for V-6 marine engine integration, detailing the chassis, electrical systems, and fuel delivery setups.

Engine and Fuel System Documentation

This factory service manual details the maintenance, teardown, and assembly procedures for the 1999 4.3L engine line. It breaks down marine-specific components like starting systems, Thunderbolt V ignition, charging circuits, and power steering diagnostics. Section 5 takes a deep dive into fuel delivery. It maps out Mercarb 2-barrel and Weber 4-barrel carburetors alongside Electronic Fuel Injection (EFI) operations, mapping out sensor functions and diagnostic trouble codes. Always observe standard marine industry safety protocols and ensure proper engine compartment ventilation before initiating any diagnostic or testing procedures.

Technical Specifications and Maintenance Data

Accurate mechanical specifications are critical for reliable rebuilding and servicing. The text provides exact factory measurements, noting the 9.4:1 compression ratio and 4.00-inch cylinder bore. Fluid capacities are clearly defined to prevent costly servicing errors. The manual lists a cooling system requirement of 20 quarts (19 liters) for closed setups, while seawater cooling systems need 15 quarts (14.1 liters) during winterization. Mechanics will also find exact baseline settings, such as the 600 RPM idle speed for EFI models versus the 650 RPM neutral specification for carbureted versions.