How do u change the timing belt on a 1990 4 cylinder honda accord?

Disconnect the wire harness at the distributor.Remove the spark plug closest to the drivers side front tire. Place the palm of your hand over the valve covers empty spark plug hole and have a helper crank the motor over until air pressure pushes past your the palm of your hand. Next, look at the cam shaft wheel and note the direction that the arrow is pointing, the arrow should be pointing straight up IN RELATION TO THE ENGINE not the earth. If it is not, you will need to manually rotate the engine till the cam wheel is infact pointing straight up. Next, Jack up the front of the car and support it with jack stand and remove the front drivers side tire.Next, support the weight of the engine with a floor jack remove the motor mount closest to the drivers side tire To remove it you will need a deep 17mm socket on a heavy duty breaker bar. Next, loosen and remove the power steering belt and alternator belts. To loosen and remove the belts you will need a 10mm wrench and a 12mm wrench. And also a 14mm or 15mm wrench. Next, use a 19mm socket AND an air powered IMPACT wrench to remove the bolt holding on the crank shaft pulley. Next, remove the crankshaft pulley. Next, use a 10mm wrench and/or 10mm socket and remove the bolts holding the plastic engine side cover. Next, loosen the 14mm or 15mm bolt which secures the 2 belt tension wheels. Next, LOOSEN the 10mm bolt that is on the balance shaft tensioner. The balance shaft is the cogged wheel with a small timing mark dot on the side of the wheel. Next, loosen the 10mm bolt on the timing belt tensioner. It's obvious what wheel is the timing belt tensioner. Next, remove the 12mm bolt on the back side of the block (near the balance shaft) a little bit of oil will drip out, this 12mm bolt will allow a long bolt to be inserted into a recessed channel of the balance shaft. This recessed channel is needed to lock the balance shaft in place. A bolt from the air conditioner works great for locking the balance shaft in place. You're basically just pushing the bolt in a hole to keep the balance shaft from spinning. Next, remove both the balance shaft belt and timing belt. Then reverse the procedure to complete the new belt installation. EXTREMELY IMPORTANT!!!!!!!!! PLEASE NOTE, the oil pump wheel furthest to the left (closest to the radiator), has a timing mark on the flat face side of the wheel, that timing mark has to be pointing directly to the 9:o'clock position in relation to the engine. The cam wheel has an arrow on the side of one of the "spokes" ...make sure it is pointing straight up in relation to the engine...straight away from the crank shaft. Put the crank wheel on with the arrow pointing straight up to the center of the cam wheel.