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The 1 UZ–FE engine has 8–cylinders in a V–arrangement at a bank angle of 90 ° . From the front of the RH bank cylinders are numbered 2–4–6–8, and from the front of the LH bank cylinders are numbered 1 –3–5–7. The crankshaft is integrated with 8 weights which are cast along with it for balancing. Oil holes are built into the center of the crankshaft for supplying oil to the connecting rods, pistons and other components. The ignition order is 1–8–4–3–6–5–7–2. The cylinder head is made of aluminum alloy, with a cross flow type intake and exhaust layout and with pent–roof type combustion chambers. The spark plugs are located in At the front and rear of the intake manifold, a water passage has been provided which connects the RH and LH cylinder heads. Exhaust and intake valves are equipped with irregular pitch springs made of special valve spring carbon steel which are capable of following no matter what the engine speed. The RH and LH intake camshafts are driven by a single timing belt, and a gear on the intake camshaft en- gages with a gear on the exhaust camshaft to drive it. The camshaft journal is supported at 5 (intake) or 4 (ex- Adjustment of the valve clearance is done by means of an outer shim type system, in which valve adjusting shims are located above the valve lifters. This permits replacement of the shims without removal of the cam- Pistons are made of high temperature–resistant aluminum alloy, and a depression is built into the piston head to prevent interference with valves. Piston pins are the full–floating type, with the pins fastened to neither the piston boss nor the connecting rods. Instead, snap rings are fitted on both ends of the pins, preventing the pins from falling out. The No.1 compression ring is made of steel and the No.2 compression ring is made of cast iron. The oil ring is made of a combination of steel and stainless steel. The outer diameter of each piston ring is slightly larger The cylinder block is made of aluminum alloy with a bank angle of 90 ° . Cast iron cylinders are installed inside the cylinder block. It has 8 cylinders which are approximately twice the length of the piston stroke. The The No.1 and No.2 oil pans are bolted onto the bottom of the cylinder block. The No.1 oil pan is made of aluminum alloy. The No.2 oil pan is an oil reservoir made of pressed steel sheet. An oil level sensor is installed Plastic region tightening bolts are used for the cylinder head, main bearing cap and connecting rod. EM–4 – ENGINE MECHANICAL Operation |