Mitsubishi 6G7 Engine Series 1990 Service Manual (P/N PWEE9037-A)

• A 1,728-page PDF set in 48 files combines a 368-page D-50/Ram 50/Raider repair volume, 687 pages in five Mitsubishi Motors workshop manuals, 672 pages in 41 Mitchell repair and diagnostic PDFs, and a one-page background note.
• Vehicle and engine coverage connects the D-50/Ram 50 and Raider chapters with 1990 Ram-50 2.4L and 3.0L work, Colt Vista 2.0L coverage, and the Colt Wagon 1.8L application, backed by VIN and engine-stamp identification tables.
• Engine repair sections cover removal and installation, cylinder-head and valve overhaul, timing-chain, timing-belt, and silent-shaft work, oil-pump inspection, piston and connecting-rod service, crankshaft and bearing checks, and engine-specific bolt-tightening sequences.
• For the R4AC1/V4AC1 automatic transmission, the 1990 article provides road, hydraulic-pressure, air-pressure, and stall testing, followed by oil-pump, clutch-pack, planetary, valve-body, and overdrive disassembly and reassembly. Separate Mitsubishi manuals cover V4AW4 and R4M21/R5M21/V5M21 bench work.
• Separate 2WD and 4WD chassis procedures address front and rear differentials, axle shafts and CV joints, locking hubs, driveshafts, hydraulic and cable clutches, disc/drum brakes, the load-sensing proportioning valve, suspension, and manual or power steering.
• Diagnostic material includes PFI sensor and actuator tests, charging and starting-system bench checks, HVAC and cooling-fan diagnosis, component-location views, vacuum diagrams, troubleshooting charts, and 1990 Ram-50 system wiring diagrams.

This is a mixed-source repair set, not a single PWEE9615 publication. The main vehicle volume moves from routine maintenance and fault finding into engine removal and internal rebuilding, while the additional workshop PDFs supply component-level engine and transmission data. The general repair material suits experienced DIY owners; the dimensional checks and bench-overhaul sections are better matched to technicians or rebuilders with pullers, presses, precision measuring tools, and prior assembly experience.

Document Identity and Application Matching

The Mitsubishi files are labeled PWEE9037-A (4G6, 1991-1992), PWEE9037-C (4G6, 1993 and subsequent), PWEE9615 (6G7, December 1996), PWEE8914-G (R4M21/R5M21/V5M21 manual transmissions), and PWEE8920-G (V4AW4 automatic transmission). The files also contain later revised pages marked PWEE9037-D, PWEE8914-H, and PWEE8920-J.

Engine matching is specific. The primary repair volume separates G52B/4G52 and G54B/4G54 applications from later G63B/4G63, 4G64, and 6G72 builds. The 1990 four-cylinder article identifies the Colt Wagon 4G37 by VIN code T, Colt Vista G63B by code V, and Ram-50 4G64 by code W; the V6 article identifies the 6G72 by code S. The 4G6 workshop books then expand component coverage to 4G61, 4G63, 4G64, and 4G67 SOHC, DOHC, turbocharged, 8-valve, 16-valve, and silent-shaft arrangements where applicable. PWEE9615 is specifically a SOHC 6G72 overhaul manual, not blanket coverage for every 6G7 variant.

The V4AW4 book is a later-model reference whose application table lists 1999 and 2001 H-series vehicles with 4G18, 4G93, or 4G94 engines. It is not the 1990 Ram-50 automatic; that truck's R4AC1/V4AC1 transmission is covered by its own 48-page overhaul PDF. Likewise, the 1980-2010 diagnostic-connector locator is a general multi-make index, not extended Ram-50 model-year coverage.

Repair and Rebuild Detail

The engine material covers compression checks, cylinder-head disassembly, valve-seat and guide rework, lash-adjuster testing and bleeding, block inspection and honing, piston and ring fitting, bearing-oil-clearance checks, crankshaft installation, final reassembly, and initial start-up after overhaul. Specifications include torque tables, rework dimensions, wear limits, oil-pump clearances, fluid capacities, sealants, and variant-specific adjustment data.

Transmission and driveline coverage reaches internal clutch and brake assemblies, planetary gearsets, servos, valve bodies, synchronizers, shift forks, shafts, bearing preload, and snap-ring or spacer selection. The axle PDFs add pinion-depth setup, tooth-contact inspection, backlash adjustment, limited-slip differential service, hub bearing work, and propeller-shaft inspection. Part-numbered service tools include MD998051 for cylinder-head bolts, MD998440 and MD998442 for lash-adjuster testing and bleeding, MD998736/MD998780 for piston pins, MD998903 for transmission clutch work, and MD998020 for transmission bearings.

Diagrams, Specifications, and Repair Cautions

Useful visuals include the 4G6 single- and double-cam engine sectional views, 4G6 lubrication-system diagrams, the V4AW4 hydraulic circuit diagram, the R4AC1/V4AC1 pressure-test-port layout, front-differential exploded, tooth-contact, and pinion-depth views, and the 1990 Ram-50 starting/charging and wiper/washer circuits.

The 4G6 instructions warn that reversing the crankshaft-sprocket flange can lead to a broken timing belt. In the 1990 four-cylinder article, installing the right silent-shaft spacer with its chamfer facing away from the oil seal will damage that seal. Fuel pressure must be released before injected-system service, R-12 air-conditioning work requires approved recovery equipment, and removal work requires secure support for the vehicle and heavy powertrain assemblies.