7736850_027 Volvo.Penta MD21, AQD21

(1) Turbocharger. (2) Crankcase Breather. (3) Oxygen Sensor. (4) Speed/Timing Sensor. (5) Magnetic Pickup Sensor. (6) Oil Filter. (7) Ignition Timing Wheel. (8) Waste Gate Actuator. (9) Vibration Damper. (10) Throttle Assembly. (11) Thermostat Housing. (12) Carburetor. (13) Motor Assembly. (14) Decelerator Fuel Cut Off (DFCO) Valve. (15) Actuator (Governor). (16) Ignition Transformer. (17) Caterpillar Interface Module. (18) Temperature Sensor. (19) MAP Sensor. (20) Air Compressor. (21) Oil Cooler. (22) Oil Filter. (23) Oil Drain Plug. (24) Electric Starter Motor. (25) Gas Pressure Regulator. Components that are remote mounted (not shown): governor control, air/fuel ratio control, and ignition control.Engine Information
The Caterpillar G3306 Truck Engine is turbocharged and has an air-to-air aftercooler arrangement (ATAAC).The cooling system consists of a gear-driven centrifugal pump, with one thermostat which regulates the engine coolant water temperature, an oil cooler, and an OEM radiator incorporating a shunt system.The engine lubricating oil, which is both cooled and filtered, is supplied by a gear-type pump. Bypass valves provide unrestricted flow of lubrication oil to the engine parts when oil viscosity is high, or if either the oil cooler or the oil filter elements (paper cartridge) should become plugged.Engine efficiency, efficiency of emission controls, and engine performance depend on adherence to proper operation and maintenance recommendations, and the use of recommended fuels and lubrication oils.Engine Identification
Caterpillar engines are identified with Serial Numbers, Performance Specification Numbers (fuel system settings), and Arrangement Numbers. In some cases, Modification Numbers are also used. These numbers are shown on the serial number plate mounted on the engine.Serial Number Plate Location
The Serial Number Plate is located on the side of the cylinder block.Information Plate
The 9L6531 Information Plate is located on the valve cover. The high idle rpm and the full load rpm are stamped on the Information Plate.Reference Numbers
Ordering Parts
Quality Caterpillar replacement parts are available from Caterpillar dealers throughout North America and the world. Their parts stocks are up-to-date and include all parts normally required to protect your investment in Caterpillar engines.* When ordering parts, your order should specify the part number, part name, quantity and serial number, arrangement number and modification number of the engine for which the parts are needed. If in doubt about the part number, please provide your dealer with a complete description of the needed item.* When maintenance or repair is needed for your Caterpillar engine, be prepared to give the dealer all the information that is provided on the 9L6531 Information Plate, described in this manual.* Discuss the problem with the dealer, such as; when it occurs, what happens, etc. This will help the dealer in troubleshooting and solving the problem faster.Fill in blanks for future reference.Chassis Serial No. ____________________Engine Model ____________________Engine Serial No. ____________________Engine Arrangement No. ____________________Modification No. ____________________Engine Low Idle RPM ____________________Engine Full Load RPM ____________________Engine Full Torque ____________________Performance Specification No. ____________________Governor Group No. ____________________Lubrication Oil Filter Element No. ____________________Auxiliary Oil Filter Element No. ____________________Liquid Supplemental Coolant Additive (Conditioner) Quantity ____________________Supplemental Coolant Additive Maintenance Element No. (If Equipped) ____________________Air Cleaner Element No. ____________________Fan Drive Belt Set No. ____________________Alternator Belt No. ____________________Lube System Capacity (Total) ____________________Cooling System Capacity (Total) ____________________