Nissan 13024-CK80A Sprocket-Camshaft

To pull the crankshaft sprocket out, you have to first take off the timing belt and then, you can take the sprocket from the crankshaft being careful about the orientation. For refitting, remove any debris on the crankshaft nose and the sprocket bore, make sure the sprocket is placed back on the crankshaft the right way and then properly fasten the timing belt. For the high-pressure pump sprocket, a suitable puller Is needed; first to remove the timing belt for holding the sprocket shaft and then to unscrew the central nut and at last use a puller to remove the sprocket from the pump and get the Woodruff key back. There should be a Woodruff key and it should be locked, engage the securing nut to the required torque and replace the timing belt tension. For the camshaft sprocket, you need to take off the timing belt to make the sprocket stay still then, unscrew the central nut to free the camshaft sprocket's position on the spline while freeing it while noting the proper alignment. The camshaft sprocket is to be refitted and the splines have to engage correctly, and then a bolt has to be inserted and tightened to the correct torque force and the timing belt tension had to be corrected. To reverse the process and to dismantle the tensioner one has to have the timing belt and securing nut loose, take off the washer and pivot bolt and then pull the tensioner assembly out. The replacement of the tensioner is carried out in the reverse sequence and then tension of the timing belt is adjusted.

Intake Position No 1 cylinder should be at TDC on compression stroke; then the cylinder head cover and the timing chain cover must be detached. With No 1 cylinder at TDC, the markings on the camshaft sprockets should be lined up; if not rotate the crankshaft 360° clockwise and align the cylinder head cam lobes for firing on No 1 cylinder. Pressing the depression on the tensioner, it is necessary to insert a thin shifter and hold the plunger with force and place it in the body of the tensioner. To fully remove the chain tensioner, loosen the two retaining bolts, and keep the tensioner rod intact; besides, you should now adjust the upper pivot point of the chain tensioner guide and pull it off the crankcase. Two mounting bolts need to be unscrewed in order to pull off the chain front guide followed by pulling the timing chain off the crankshaft sprocket and later lifting the chain out of the engine. Loosen the exhaust camshaft sprocket retaining bolt when the camshafts are held with another spanner and remove the bolt and comes out of the sprocket. Indeed, to get to the sprocket on the inlet camshaft, the inlet camshaft has to be unscrewed; similarly, to get to the crankshaft sprocket, the oil pump chain and sprocket as a single assembly has to be undone. Check the teeth on camshaft and crankshaft sprockets for wear or damage and the linking parts of the timing chain and chain really for wear; an excessive side play means renewal of the chain. It is recommended to replace the timing chain if the miles on the engine or the car was high or if there has been a loud sound coming from the chain, and the chain as well as the sprockets have to be renewed in pairs. It should be checked to see whether the chain guides are worn out, and whether the chain tensioner is working properly and any which are worn should be replaced. To refit the crankshaft ensure that you have the engine piston at TDC, then turn the engine until the timing pin of the exhaust camshaft sprocket is lined up with the corresponding slot, tighten the camshaft sprocket bolt then place the timing chain round the crankshaft sprocket such that the coloured link faces the TDC mark. Set and securely fasten the chain front fixed guide and its bolts and set the chain rear tensioner guide and position it. Place back the chain tensioner, torque up the bolts on the chain tensioner and ensure that the plunger of the tensioner will pull the slack chain. Ensure that all the timing marks coalign, fit crank shaft pulley on the crank shaft, rotate the engine two revolutions clockwise to ensure the alignment, remove the crank shaft pulley and fit the timing chain cover then fit the crank shaft pulley and cylinder head cover.