1964-1986 OMC Sterndrive Service Manual

Technical Scope and Service Data for 1964–1986 OMC Sterndrive Units

• Covers 1964–1986 OMC Sterndrive units, documenting GMC in-line 4/6-cylinder, GMC V6, GMC V8, and Ford V8 inboard engine configurations
• Official OMC publication P/N 1051858
• Contains 143 exploded-view diagrams and 18 wiring schematics for electrical and tilt system identification
• Stored against your account so you can retrieve it after a hard-drive loss
• Full-text search finds any part number in seconds
• This 574-page edition is the authoritative service publication for the 1964–1986 OMC Sterndrive production run, providing internal engine tolerances, torque values, and electrical system diagnostics for all listed engine variants.

Engine Service and Diagnostic Walkthrough

The 1964–1986 OMC Sterndrive service manual covers internal component procedures across all main engine groups. The content details valve timing principles, camshaft removal and installation sequences, and specific cylinder head reconditioning steps for GMC in-line, GMC V6, and GMC V8 engines. Maintenance chapters outline the procedures for oil pump service, water pump removal, and tilt mechanism diagnostics, including clear guidance for the early 1964–1977 units versus the post-1978 models. The document further explores the fuel system, detailing carburetor bench adjustments for Rochester and Holley models, alongside exhaust manifold and cooling system maintenance.

Technical Specifications Preview

This publication provides critical reference values for engine assembly and tuning. Crankshaft bearing clearance is documented at 0.0005"–0.0025", while cylinder head flatness must not exceed 0.003" in any six-inch section. Valve guide wear limits for intake valves are specified at 0.001". Ignition timing adjustments and centrifugal advance tables for all listed models are included. Understanding factory workshop documentation structure assists users in navigating these complex system requirements.

Reference only — always consult a certified technician before performing service on this equipment.

An official 574-page OMC OEM workshop manual covering the 1964–1986 OMC Sterndrive engines, documenting engine, chassis, electrical, and fuel-injection specifications for the comprehensive range of in-line and V-series powerplants.