Mitsubishi 4G63, 4G64 Gasoline Engine Factory Service & Repair Manual • P/N 99729-74120

Technical Details: Mitsubishi 4G63 and 4G64 Service Manual

• Available as an instant download, this 101-page OEM technical reference (P/N 99729-74120) provides immediate access to service data for gasoline and LP-gas engines used in forklift applications.
• Features an OCR text layer for quick digital navigation and allows printing of individual sections directly for shop-floor use.
• Contains 26 exploded-view assembly diagrams and 39 technical specification tables detailing tolerances, wear limits, and electrical reference settings.
• Streamlines diagnostic workflows and mechanical repair planning for the AA0001–YY9999 engine serial number range.

Engine Documentation Overview

When servicing material-handling equipment, accurate data is non-negotiable. Before initiating any mechanical work, technicians must verify all shop safety protocols and relieve fuel system pressures as outlined in the general information section. This documentation details the inspection and assembly requirements for the 4G63 and 4G64 engine family, starting with performance curves and model identification.

The manual provides technical guidance on the timing belt assembly, including the exact adjustment of tensioners and sprockets, alongside deep dives into the lubrication and cooling systems. You will find specific removal and reassembly reference points for fuel system components, such as the down-draft carburetor and air governor, ensuring correct calibrations after maintenance.

Internal Components and Tightening Data

Need to dive into the bottom end? The text provides exact assembly specifications for the crankshaft, pistons, and connecting rods, including verification techniques like the plastic gauge method for checking oil clearances. Additional chapters document the cylinder head, valves, rocker arms, and camshaft configurations.

Technical data is mapped out for all critical engine measurements. The manual details oversized dimensions for machine work on valve seats and guides, supplemented by extensive torque charts listed in N.m, kgf.m, and lbf.ft for all major fasteners. Cylinder head bolt torque is set at 20 N.m plus a 1/4 turn, while connecting rod bearing bolts require 10 N.m plus a 1/4 turn. Ignition timing for the 4G63 is documented at 4° BTDC for gasoline versions. With automatic lash adjusters eliminating the need for intake valve clearance checks, having these exact figures on hand prevents guesswork and ensures every shop-floor repair meets original factory standards.