Mitsubishi 6G72 / 4G6 & Dodge Ram 50 1990 Repair Manual Collection (P/N PWEE9615)

The vehicle repair volume covers maintenance, fault finding and mechanical repairs, while the separate engine and transmission publications provide component overhaul instructions and inspection data. Application tables distinguish the assemblies before their procedures or specifications are selected.

Application limits: The 6G7 publication covers the SOHC 6G72. The V4AW4 reference lists later H-series applications with 4G18, 4G93 and 4G94 engines; it is not the 1990 Ram-50 automatic transmission reference. The diagnostic-connector locator is a general index, and its date range does not extend vehicle repair coverage.

PDF Search, Bookmarks and Diagram Detail

Finding text and circuit details: Text search is available in the vehicle repair volume, 6G72 manual and repair-article text. The two 4G6 manuals and manual-transmission workshop PDF lack searchable body text; the V4AW4 PDF has searchable text on its revised application-table page. All five Mitsubishi component manuals have chapter bookmarks. The vehicle volume has only two generic bookmarks, and the separate repair articles have none. Small labels in the vehicle-volume wiring diagrams need magnification, and scan lines cross some drawings; the separate Ram-50 circuit sheets are clearer.

The ZIP contains 48 printable PDFs totaling 1,728 pages. This includes 42 notes or intentionally blank pages within the Mitsubishi component manuals, one catalog page within the vehicle volume, and the separate one-page background note.

Engine, Transmission and Vehicle Repair Coverage

These selected content highlights show the main workshop areas rather than a complete contents list. Other topics include door hardware, minor body repairs and instrument-gauge testing.

• Engine overhaul: Engine removal and installation, cylinder-head and valve work, piston and connecting-rod service, crankshaft inspection, bearing checks and reassembly.

• Timing and lubrication: Timing-chain, timing-belt and silent-shaft procedures, tensioner inspection, oil-pump checks and engine-specific tightening sequences.

• Transmission work: R4AC1/V4AC1 road, pressure and stall tests, plus internal overhaul procedures and separate Mitsubishi manual-transmission and V4AW4 bench references.

• Axles and driveline: Differential overhaul, axle shafts, CV joints, locking hubs, driveshafts, transfer cases, and hydraulic or cable-operated clutch service.

• Brakes and chassis: Disc/drum brake repairs, load-sensing proportioning-valve adjustment, wheel bearings, suspension, and manual or power-steering procedures.

• Fuel and engine controls: Carburetor overhaul, fuel-system checks, injector service, PFI sensor and actuator tests, and emissions-control diagnosis.

• Electrical and HVAC diagnosis: Charging and starting tests, heater and cooling-fan checks, component-location drawings, vacuum diagrams, troubleshooting charts and system wiring diagrams.

The general vehicle repairs suit experienced DIY owners; the precision measurements and internal overhaul work require prior mechanical experience, appropriate measuring equipment, pullers and presses.

Engine Applications and Overhaul Detail

The vehicle volume separates the earlier G52B/4G52 and G54B/4G54 engines from G63B/4G63, 4G64 and 6G72 applications. The 1990 engine articles also distinguish the Colt Wagon, Colt Vista and Ram-50 engines through their identification tables.

The 4G6 books address applicable SOHC, DOHC, turbocharged, 8-valve, 16-valve and silent-shaft configurations. Their sectional views and lubrication diagrams support component identification alongside the repair procedures.

Internal inspection: Coverage includes compression testing, valve-seat and guide rework, lash-adjuster leak-down testing and bleeding, block inspection and honing, ring fitting, bearing-clearance measurement, and initial start-up after rebuilding. Rework dimensions, wear limits, sealants and torque tables accompany the relevant assemblies.

Fuel and cooling: The vehicle chapters contain step-by-step procedures for carburetor disassembly and reassembly, along with fuel-pressure checks and fuel-injection component service. Cooling coverage includes thermostat testing, radiator removal, water-pump replacement and heater-system work.

Timing cautions: The 4G6 instructions warn that an incorrectly oriented crankshaft-sprocket flange can cause timing-belt failure. The four-cylinder overhaul article also identifies a silent-shaft spacer orientation that can damage the oil seal.

Transmission, Transfer Case and Axle Work

The automatic-transmission material goes beyond external servicing into oil pumps, clutch packs, planetary assemblies, valve bodies and overdrive components. Hydraulic and air-pressure test illustrations connect the diagnostic checks with the internal assemblies.

The manual-transmission workshop material covers synchronizers, shift forks, shafts, bearings, preload checks and selective snap rings or spacers. V5MT1 appears in the separate servicing application table; the supplied manual-transmission bench publication is identified for R4M21, R5M21 and V5M21.

Differential setup: Front and rear axle material includes pinion-depth measurement, tooth-contact assessment, backlash adjustment and limited-slip differential service. Exploded differential drawings and pinion-setting illustrations accompany the setup instructions.

Named service tools include MD998051 for cylinder-head bolts, MD998440 and MD998442 for lash-adjuster checks and bleeding, MD998736 and MD998780 for piston pins, MD998903 for clutch assemblies, and MD998020 for transmission bearings.

Electrical Tests and Workshop References

PFI coverage includes sensor resistance checks, connector-terminal identification, relay tests and idle-control checks. The component-test article distinguishes these checks from diagnosing wiring opens or shorts, so a component result is not a substitute for circuit diagnosis.

Charging and starter articles include output, regulated-voltage and bench tests. HVAC material adds blower, switch, relay and temperature-sensor checks, while the instrument-panel article supplies gauge and sending-unit tests.

Diagram examples include the V4AW4 hydraulic circuit, R4AC1/V4AC1 pressure-test-port layout, and 1990 Ram-50 starting/charging and wiper/washer circuits. These complement the engine sectional views, lubrication diagrams and differential drawings.

Fuel-system work requires pressure release before service. R-12 air-conditioning procedures call for approved recovery equipment, and vehicle or powertrain removal work requires secure support.

Examples of 6G72 Ring and Thrust-Bearing Specifications

For the 6G72-SOHC, the No. 1 piston-ring end-gap specification is 0.30–0.45 mm, with a 0.8 mm service limit. The overhaul section pairs these figures with ring inspection instructions.

Crankshaft end play is specified at 0.05–0.25 mm, with a 0.3 mm limit for the thrust-bearing check.