1978 1995 Porsche 928 GT, GTS, S4 Workshop Manual

Technical Scope and Coverage for the Porsche 928 Series

• Covers 1978–1995 Porsche 928, 928 S, 928 S4, 928 GT, and 928 GTS models, documenting technical specifications for V8 engine variants and drivetrain configurations
• Official workshop documentation, printed in Germany, revised XXVII 1991
• Contains dozens of exploded-view diagrams, torque specification tables for internal engine components, and electrical pinout references for the diagnostic socket
• Files are accessible from your device as soon as the order is placed
• Suitable for printing individual sections for shop-floor use
• This 1991 edition provides the definitive assembly data and maintenance parameters required for the 32-valve engine iterations and earlier 16-valve units

Manual Content Preview

This Porsche 928 publication serves as a comprehensive workshop resource, organizing technical data into specific repair groups that align with the vehicle's drive unit, drivetrain, chassis, bodywork, and electrical systems. It provides detailed diagnostic guidance for the LH and EZK control units, including error code interpretation for sensors, fuel injection components, and ignition systems. The manual details the structural breakdown for engine components, from crankcase assembly and crankshaft bearing clearances to camshaft housing, valve train settings, and cooling system maintenance. Users gain access to critical specifications regarding intake and exhaust valve timing, piston and cylinder bore tolerances, and fluid capacity requirements across the various model years.

Specification Highlights

Specifications cover engine tuning data, tightening sequences, and diagnostic thresholds essential for accurate maintenance. The manual documents the torque values for the Porsche 928 camshaft housing at 45 Nm and lists main bearing bolt torques across multi-stage sequences. Coolant system capacity is documented at 16 liters for most models, while engine oil volume for changes is listed at approximately 7.5 liters. Electrical system data includes a standard 12 V battery rating and specific resistance values for engine temperature sensors across temperature ranges from 32°F to 212°F. Diagnostic reference values for the LH control unit include how factory workshop documentation is structured to ensure system integrity. This official Porsche 928 workshop manual provides essential mechanical and diagnostic data for the 1978–1995 production range, including detailed specifications for the 928 S4, GT, and GTS high-performance engine variants.