1991-1995 Mitsubishi Sigma and Diamante Service Manual (P/N PWGE9004-D)

• Details 1991–1995 Mitsubishi Sigma and Diamante sedans, including SOHC and DOHC 6G72 V6 engine variants equipped with 5-speed manual or 4-speed automatic transmissions.
• Based on official Mitsubishi Motors publication P/N PWGE9004-D (includes revisions from 1990 through 1994).
• Includes over 100 pages of technical illustrations, exploded-view assembly diagrams, and precise torque specification tables for major engine and chassis components.
• This technical manual provides the exact assembly, lubrication, and identification data required for factory-level maintenance on the 6G72-series powerplant.

Component and Systems Documentation

This service manual breaks down critical powertrain and chassis systems for the 1991–1995 Mitsubishi Sigma and Diamante. The documentation starts with vehicle identification, model code breakdowns, and chassis number locations before diving into complete specifications for the 6G72 SOHC and DOHC engines. You will find dedicated reference material for service adjustments such as drive belt tension, ignition timing, and idle speed. Additional sections map out the lubrication system (including engine oil cooler removal and replacement), fuel system components with multi-point injection diagrams, and the supplemental restraint system (SRS) structure alongside essential safety precautions.

Engine and Torque Reference Data

Engine identification data, serial number cycles, and displacement metrics are mapped out for both the 6G72 SOHC and DOHC blocks. To ensure precision assembly across the engine block, cylinder head, and oil pan, all standard and flange bolt torque values are provided in Nm, kgm, and ft-lbs. The manual documents the 6G72 V6 total displacement at 2,972 cc (181.3 cu. in.) with a 10.0 compression ratio. You will also find technical specifications for crankshaft front oil seal installation tools, intake valve clearances, and sensor locations for the multi-point injection system. Please ensure you observe standard shop safety practices and verify all lift points and system depressurization steps before beginning mechanical work. As an essential reference document for the 6G72-powered flagship sedan, this manual delivers the clear technical data needed for professional diagnostics, routine maintenance, and mechanical overhauls.