36 ENGINE — 2UZ-FE ENGINE 5. Piston The piston is made of aluminum alloy. The piston head portion has adopted a taper squish to improve the fuel combustion efficiency. The piston ring grooves have been treated with alumite coating to improve the piston’s wear resis- tance. Tin Plating Semi floating type piston pins are used. 156EG02 6. Connecting Rod The sintered and forged connecting rod is very rigid and has little weight fluctuation. A weight-adjusting boss is provided at the big end to reduce fluctuation of weight and balance the engine assembly. The connecting rod cap is held by plastic region tightening bolts.
The connecting rods for the right and left banks are placed in opposite directions with the outer marks facing the crankshaft. The connecting rod bearing is made of aluminum alloy. Right Bank Connecting Rod Left Bank Connecting Rod Crankshaft Outer Mark Front Outer Marks (Projected) Outer Mark 156EG09 Weight Adjusting Boss 156EG03