General Specification G643(E) Service Manual Chapter 1. General Information 14 G643E Engine G643 Engine GENERAL DESCRIPTION ENGINE TYPE: 90°4-Cycle V6, Water Cooled COMBUSTION SYSTEM: Naturally Aspirated INTAKE MANIFOLD Cast Iron, Dry EXHAUST MANIFOLD Cast Iron, Dry VALVE CONFIGURATION: Pushrod Actuated Overhead Valves - 2 Per Cylinder Auto Lash adjustment by hydraulic valve lifter CAMSHAFT DRIVING: Timing Chain System BALANCE SHAFT: One Balance Shaft System DISPLACEMENT: 4294 cc (262 CID) BORE: 101.60 mm (4.00 in.) STROKE: 88.39 mm (3.48 in.) COMPRESSION RATIO: 9.4:1 COMPRESSIONPRESSURE: 690 kPa (100 psi) Minimum FIRING ORDER: 1-6-5-4-3-2 WEIGHT: 296 Kg (653 lbs.), Wet ENGINE ROTATION:
Counter-Clockwise (CCW) when viewed from Flywheel End FUEL TYPE: LPG CRANK VENTILATION PCV System IGNITION SYSTEM IGNITION TYPE: Distributor System IGNITIOIN TIMING: Electronic controlled by ECM IGNITION COIL: 12 V operation volt DISTRIBUTOR: Delco EST Distributor with ignition module SPARK PLUGS: BOSCH 4205, 0.9mm (0.035in.) Air Gap LUBRICATION SYSTEM OIL PRESSURE (MIN. HOT): 28 kPa (4 psi) @ 700 RPM 124 kPa (18 psi) @ 2000 RPM OIL TEMPERATURE: Upper Limit: 130°C (266°F) Recommended: 99 - 110°C (210 - 230°F) Lower Limit: 80°C (176°F) CRANKCASE CAPACITY: 4.3 L (4.5 qts.) OIL FILTER: 0.47 L (0.5 qt.) ENGINE OIL SPECIFICATION: API - SJ, SAE 10W30 COOLING SYSTEM WATER PUMP ROTATION:
Serpentine Belt Drive - Clockwise (CW) when viewed from engine front THERMOSTAT: Opening Temperature: 82°C (180°F) Fully Open Temperature: 96°C (205°F) COOLING WATER CAPACITY 7.6 L (block only)