Mitsubishi Eclipse II technical information manual page 25

text version of content this owner's manual page from owners manual to the vehicle Mitsubishi Eclipse, year of production 1995 - 1999:

ENGINE - Base Engine CONNECTING RODS N71ABO4AA The connecting rods are different from past designsthe surface hardness slightly. This design process because the manufacturing process has changed. The connecting rod is forged as one piece from eliminates the need for several machining opera- powdered metal. The powdered metal is placed tions that are required for cast iron, connecting rod assemblies. Other designs required machining the in a form that is slightly oversized and then sent connecting rod and connecting rod cap individually, to sintering furnace. It melts the powdered metalthen finish machining, honing, and balancing are in the mold. The mold travels to a forging press performed as an assembly. where the rod is forged to the final shape. This is done while the rod is still warm, but not molten. Note The new process and the different metal does not After the forging process, the inside diameter of prohibit the use of standard tools. If the connecting the crankshaft end of the rod is scribed with a laser rods require removal from the engine a center punch and is fractured in a fixture. This creates a rod cap and rod that only fit together one way. The final can be used to identify the correct position of the connecting rod and cap. step in the process is shot peening which increases CAMSHAFT N71ABOSAA The camshafts have six bearing journals and 2 cam sensor on the exhaust camshaft at the rear of cylin- der head. A hydrodynamic oil seal is used for oil lobes per cylinder. Flanges at the rear journals con- trol camshaft end play. Provision for cam positioncontrol at the front of the camshaft. CRANKSHAFT N71ABOGAA The engine has 5 main bearings, with number vide end sealing, where the crankshaft exits the3 flanged to control thrust. The 52 mm (2.0472 in.)block. Anaerobic gasket material is used for parting diameter main and 48 mm (1.8898 in.) diameter line sealing in the block. A sintered powder metal crank pin journals (all) have undercut fillets that timing belt sprocket is mounted on the crankshaft nose. This sprocket provides motive power; via tim- are deep rolled for added strength. To evenly distrib- ing belt to the camshaft sprockets (providing timed ute bearing loads and minimize internal stress, 8 valve actuation) and to the water pump. counterweights are used. Hydrodynamic sealspro-

owners manual Mitsubishi Eclipse

owners manual Mitsubishi Eclipse - year of production: 1995, 1996, 1997, 1998, 1999 - Mitsubishi Eclipse II technical information manual EN