Removal of the timing chain requires time and patience. The timing chain on a Nissan Maxima is accessed from underneath the car, and replacing it involves removing major engine components while using an engine hoist. While timing chains don't need repairs very often, a faulty chain can lead to significant engine damage if it is not replaced quickly. A grinding noise coming from the engine of a car with high mileage can often be attributed to a damaged timing chain.
Replace the existing crankshaft sprocket with the mating mark facing out by sliding it onto the crankshaft, located low on the front of the motor. Position the crankshaft to top dead center (TDC) of the compression stroke. You may have to turn this by hand to get it to twelve o' clock. Lower the timing chain guide into position around the crankshaft sprocket. The front mark on the guide should face upwards.
Align the marks on the intake and exhaust camshaft sprocket with the marks on the timing chain. Tighten the exhaust camshaft sprocket onto the dowel pin (the dowel pin is connected to the chain cover assembly) and torque the mounting bolts to 88-95 foot-pounds.
Align the timing chain and sprocket mating marks and lower them into the engine compartment, wrapping the lower part of the timing chain around the crankshaft sprocket (previously installed in step 1), and connecting the upper part of the timing chain to the camshaft sprocket (previously installed in step 2).
Align the mating mark on the crankshaft with the match-mark (gold ink) on the lower timing chain by turning it clockwise with your hand. Install the lower timing chain to the water pump sprocket by pulling the chain around the sprocket, paying close attention to match up the mating marks.
Replace the existing intake sprocket by sliding it onto the crankshaft sprocket and torque the bolts to 88-95 foot-pounds. Replace the existing internal timing chain guide and upper timing chain guide by sliding them on to the crankshaft behind the intake sprocket. Replace the lower timing chain tensioner and slack side timing chain guide, in that order, by sliding onto the crankshaft. Tighten the timing chain guide to 88-95 foot-pounds.
