1964-1986 OMC 4/6-cylinder, GMC V6, GMC V8, and Ford V8 Sterndrive Service Manual (P/N 1051858)

This official 574-page OMC OEM publication (P/N 1051858) delivers comprehensive service data for the 1964–1986 OMC Sterndrive production run. It documents engine, chassis, electrical, and fuel-injection specifications for the complete range of in-line and V-series powerplants.

• Covers GMC in-line 4 and 6-cylinder, GMC V6, GMC V8, and Ford V8 inboard engine configurations.
• Features 143 exploded-view diagrams for precise component identification.
• Includes 18 wiring schematics targeting electrical routing and tilt system diagnostics.

Engine Service and Diagnostic Details

The manual breaks down internal component specifications across all main engine groups. You get exact documentation on valve timing principles, camshaft installation sequences, and cylinder head reconditioning. Maintenance sections outline critical parameters for oil and water pump teardowns. Tilt mechanism diagnostics are heavily featured. Crucially, the text differentiates between early 1964–1977 units and later post-1978 models. It details carburetor bench adjustments for Rochester and Holley configurations, alongside exhaust manifold and cooling system data. Marine powertrain maintenance inherently involves significant mechanical risks, particularly when handling heavy engine blocks or pressurized fuel lines. Always apply standard shop safety practices. Consider consulting a certified technician before attempting complex diagnostic work on these systems.

Technical Specifications and Clearances

Critical reference values for engine assembly and tuning are fully documented. For example, crankshaft bearing clearance is listed exactly at 0.0005" to 0.0025". Cylinder head flatness tolerances dictate a maximum deviation of 0.003" per six-inch section. Intake valve guide wear limits are firmly set at 0.001". The resource also provides full ignition timing adjustments and centrifugal advance tables for all covered models, ensuring you have the exact factory data required for accurate tuning. Understanding these complex system requirements is essential for accurate workshop procedures.