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Removing and installing timing chain
| Fig. 2.14. Details of the valve timing engine SR20DE: 1 - an asterisk of an inlet camshaft; 2 - the bolt of the upper chain guide; 3 - camshafts; 4 - upper chain guide; 5 - O-ring; 6 - cylinder block; 7 - the exhaust camshaft sprocket; 8 - the bolt of the camshaft sprocket; 9 - timing chain; 10 - Front chain guide; 11 - an asterisk of the crankshaft; 12 - bolt the front chain guide; 13 - Drive hub of the oil pump; 14 - a bolt of fastening of a cover timing; 15 - the crankshaft pulley; 16 - bolt crankshaft pulley; 17 - a cover of a drive of camshafts; 18 - pin-bolt; 19 - a lining; 20 - a sealing ring; 21 - chain tensioner; 22 - bolt and nut chain tensioner; 23 - tensioner shoe
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The device timing engine SR20DE shown in Fig. 2.14.
Withdrawal To remove the set of the first piston cylinder to TDC of the compression stroke. Remove the cylinder head cover. Remove the timing cover. Remove the oil filter. Turn out fixing bolts and nuts and remove the chain tensioner drive to the rear of the cylinder head. Remove the tensioner with the O-ring and gasket.
| Fig. 2.44. Removing the drive chain guide
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| Fig. 2.45. Removal of the tensioner shoe
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| Fig. 2.46. Removing the front drive chain guide
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| Fig. 2.47. Lock the rotation of the camshaft with a wrench
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Remove the screws and remove the top directing to a chain drive to the top of the cylinder head (Fig. 2.44). Remove the pin-bolt and the tensioner shoe with the crankcase (Fig. 2.45). Remove the screws and remove the front chain guide timing ( Fig. 2.46). Turn out bolts of asterisks of camshafts, previously blocked by rotating the camshafts using a wrench mounted on the flats on the right side of each of the camshaft (Fig. 2.47). Remove the bolts with washers Stars. Remove the asterisk from the ends of the camshafts. Remove the timing chain with the stars and out of the engine block. If necessary, remove the crankshaft sprocket.
NOTE Do not rotate the crankshaft at the removed circuit timing. |
| Fig. 2.48. Install the crankshaft sprocket
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Examine the teeth of sprockets and camshafts. They must be free of wear and damage. Inspect the drive chain links: roller should not be signs of wear or damage. The wear chain is determined by the presence of a large backlash.
| Fig. 2.49. Marking the chain timing
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Inspect chain guides: they should not be signs of wear or nicks from shocks chain. Before installing, make sure that the crankshaft of the engine established in the state in which the piston of the first cylinder is at TDC compression stroke and set the key in the groove of the crankshaft. Keyway on the crankshaft must be in the "12 o'clock". Put a star on the end of the crankshaft (Fig. 2.48). Chain timing has three links, different in color from the other units, one unit is worn on the crankshaft sprocket and the two links are established on the camshaft sprocket (Fig. 2.49). On some models, the motor chain links that are placed on the camshaft sprocket, different in color from the unit, which is mounted on the crankshaft sprocket.
| Fig. 2.50. Installation of a chain link, a different color from the other units, opposite the mark on the crankshaft sprocket
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Place the units differ in color from the outside; put the chain on the crankshaft sprocket by setting the corresponding link tags against the initial timing adjustment, located on the sprocket (Fig. 2.50). Turn the camshaft sprocket in a position where the label starting timing adjustment will be outside.
NOTE Asterisks camshafts interchangeable. |
| Fig. 2.51. Installation of a chain link, a different color from the other units, opposite the mark on the sprocket of the exhaust camshaft
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| Fig. 2.52. Installation of a chain link, a different color from the other units, opposite the mark on the sprocket of the inlet camshaft
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Put the chain on asterisks of camshafts. Install the chain links that differ in color, marks the start against the timing adjustment (Fig. 2.51, 2.52). Set pins (if they were removed) in the opening position and the camshaft sprocket so that they coincide with the slots alignment pins. Make sure that the color of different links in the chain are opposite marks the initial adjustment of the timing, which are located on the sprockets. Otherwise, remove the chain from the sprocket and correct the relative position of labels and distinguished by the color of links in the chain. After proper cueing insert the bolts and washers fastening of asterisks of camshafts and tighten the set moment, blocking wrench camshafts from rotating. Install the front chain guide in the housing and tighten the bolts specified torque. Install chain tensioner shoe and tighten the stud bolt specified torque. Install the top chain guide on the top of the cylinder head bolts and tighten the set moment.
| Fig. 2.53. Chain tensioner: 1 - the lever of relieving pressure hydraulic piston; 2 - biscuit lock plunger rod
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Press the lever to relieve pressure hydraulic piston, then press the plunger so that it entered the body (Fig. 2.53). Hold down the plunger to enter into engagement biscuit and plunger rod.
| Fig. 2.54. Installing the tensioner assembly to the cylinder head. The arrow should be pointing away from the cylinder head
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Install a new washer tensioner and a new O-ring into the groove on the body of the tensioner. Replace the tensioner. Make sure that the arrow is pointing away from the cylinder head (Fig. 2.54). Install nuts and washers securing the tensioner and tighten the set moment. After tightening the nut cracker automatically disengages the rod and the plunger is released. Perform further assembly operations in the reverse order of removal.
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