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Re: 1993 nissan maxima
Use a impact gun with a few extensions is the easiest solution. I can assure you that trying to loosen it by hand will not work. Be careful, sometimes that bolt on various vehicles has reverse threads.
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Do you have the crank pulley bolt loose? To loosen it, pull the starter and wedge something against the ring gear teeth on the flywheel-I often use a piece of wood in there, although a large screwdriver or prybar would also work. Put a socket on the crank pulley bolt (use a large breaker bar) and loosen it while holding the flywheel stationary. If the pulley wont move off the crank with some tapping on it to move it, then you will have to use a puller to get the pulley off the crank. Use a harmonic balancer pulley puller, or a 2 or 3 armed puller, if the harmonic balancer puller wont work.
Disconnect the negative battery terminal. Using a ½-inch-drive ratchet and the 19 mm socket, turn the center bolt on the crankshaft so that number-one cylinder piston is at top dead center (TDC). You will know you ware at TDC when the mark on the crank is in alignment with the arrow on the timing cover.
Disconnect the cruise control connector and remove the cruise control actuator. Loosen the upper mounting bolt with the 14 mm socket. Use a 12 mm socket to loosen the lower nut then use a 10 mm socket to loosen the adjuster from the power steering pump and remove the belt.
Loosen the upper air conditioner mounting bolt using the 14 mm socket. Use the 12 mm socket to loosen the lower nut and adjusting bolt on the alternator and remove the alternator/AC belt. Remove the valve cover using a 10 mm socket.
Place the jack behind the left front wheel where the arrow is located indicating the jack location, and raise the vehicle. Put the jack stand under the subframe behind the jack, then lower the jack. Remove the left front wheel for easy access to the crank pulley. Using a block of wood atop the jack, place the jack under the oil pan and lift with slight pressure to hold the engine in place. Remove the side engine mount using a 17 mm deep socket.
Take off the dipstick, pipe tube and upper timing cover using a 10 mm socket. Then remove the timing belt adjuster rubber seal without loosening the adjuster nut. Take off the crankshaft pulley bolt. Use the chain wrench to hold the the crankshaft pulley while turning the crankshaft pulley bolt with a 19 mm socket. Use the 10 mm wrench and 10 mm socket to remove the bolts on the lower cover. Remove the lower cover and mark the location of the cam, crank and balancer shaft with Liquid Paper. Remove the balancer shaft belt and timing belt.
Install the timing belt and the balancer shaft belt in the reverse order of removing them. During Installation of the crank pulley, coat the threads of the crank pulley bolt with engine oil and tighten it to 159 foot-pounds. Finally, adjust the tension of the power steering and alternator belts as well.
get every thing out of your way that needs to be out of your way. figure a way out to hold the engine in place to get the crank pully bolt off wether it be with manual tranny and someone holding the brakes or if automatic you will need to hold the pully it self with something along the lines of a oil filter wrench like one with a chain that is adjustable this is what i use but you have to be sure not to damage the groves for the belt, a little nic or two will be ok. some cars have special tools to do the holding also. then take the bolt off. it will be tight so use good tools and you may have to use a cheater bar for leverage. and on assembly make sure everything is torqued to specs. the particular vehicle may require light duty lock tight on the pully bolt so check to make sure.