Timing belts should be replaced every 60,000 miles on a Toyota T100. If you fail to repair or replace your timing belt, you run the risk of causing severe damage to your Toyota's engine. In addition, you could end up stranded with your truck out of order due to a broken timing belt. Your timing belt probably needs to be replaced if you hear slapping or screaming noises coming from your engine. Keeping a schedule of routine maintenance is recommended, and replacing the timing belt is easy.
Remove the engine's undercover.
Remove the radiator cap under the car, which resembles a household spigot. While wearing gloves, drain the engine coolant from the radiator drain valve by removing the radiator drain plug.
Remove the upper radiator hose by using a flathead screwdriver to loosen the hose clamp. Loosen the clamp and slide it down the hose, tightening it slightly to keep it in place. Remove the hose.
Disconnect the two power steering hoses from the air intake chamber by simply removing the power clamp bolt. The hoses should be easy to pull out of place. Move the power steering pressure tub close to the frame. Remove the power steering drive belt by simply unbolting the belt from the power-steering pump and loosening the lower mount bolt. This will allow you to pull the belt off of the pulley. Finally, loosen the adjuster clamp nut with a wrench, unbolt the adjuster bracket from the water pump housing, and remove the pump by slowing pulling it out of the area.
Find the suction hose that fits onto the compressor and remove it. Detach the compressor's electrical connector and mounting bolts with your wrench. This should free the compressor and allow you to pull it out of the area. Remove the compressor.
Remove the bolt, oil dipstick, dipstick tube and the O-ring. These are easy to identify because you use them when checking your oil levels. There should be an O-ring attached to a tube that indicates oil, and the oil dipstick is attached to that O-ring to make removing it simple. Use your wrench to remove the bolt holding these items in place, and then slowly remove them.
Remove the timing belt cover by disconnecting the four spark plug wire clamps as well as the six bolts around the cover with your wrench. If there are any signs of leakage from the seals of the timing pulleys, such as cracks and tears, stop working and call a professional mechanic. If the timing pulleys are in good working condition, remove the fan bracket and the crankshaft pulley. These items are attached to the engine's vibration dampener. Simply remove the bolts holding them in place with your wrench, then remove from the area. Remove the two bolts on the starter wire bracket as well as the four bolts on the cover of the number one belt cover.
Remove the timing belt guide, which resembles a large washer, on the crankshaft.
Remove the timing belt tensioner, the timing belt, and the camshaft timing pulleys by slowing pulling them out of place.
Install the crankshaft timing pulleys using 130 ft.-lbs. of torque with the torque wrench. Align the pulley set key with the key groove of the timing pulley and slide it onto the timing pulley, ensuring that the flange side is facing inward.
Install the timing belt. Be sure that no water or oil is on the belt. To start, face the front mark of the timing belt forward, and then install the timing belt to the lefthand timing pulley. Ensure that the alignment marks on the pulleys and the top of the crankshaft gear match. Repeat this process with the righthand pulley.
Set the timing belt tensioner, and install it using your Allen wrench. Slowly press in the push rod, aligning the holes of the push rod and housing. Replace the dust boot of the tensioner, and then install the two bolts that had been removed originally.
Check the valve timing. Install the timing belt guide with the cup side facing forward and the smooth side facing the belt. Turn the crankshaft clockwise and align the timing marks of the crankshaft timing pulley to the oil pump body. When the timing marks are aligned, remove the crankshaft pulley bolt. Install the timing belt guide plate, which holds the belt in place while the belt moves.
Install the timing belt cover with torque of 80 lbs. using your torque wrench on the four bolts that hold it in place. Install the fan bracket, belt cover, oil dipstick and guide, making sure the O-ring is in place to seal the dipstick tube. Install the fan bracket with one bolt and nut, and install the timing belt cover with six bolts. Install the oil dipstick, guide and O-ring by attaching the single bolt on each to the generator bracket.
Install the A/C compressor bracket with a torque of 35 lbs. using your torque wrench.
Install the fan shroud and the alternator belt using your wrench. Reattach the bolts you removed during disassembly.
Tighten the fan with the fluid coupling and the fan pulley with 65 lbs. of torque using the torque wrench.
Connect the A/C compressor to the engine with 18 lbs. of torque using your torque wrench on the four bolts removed during disassembly. Install and adjust the belt with 31 lbs. of torque with the torque wrench, and connect the power steering pump to the engine.
Reconnect the upper radiator hose by putting it back in place and tightening the hose clamp. Fill the engine with new coolant and check for leaks, which will be indicated by fluid coming through cracks and tears around the timing belt. If there are no leaks, install the engine under the cover by snapping it into place.
Perform a road test to see if there are any abnormal noises. If you do not notice any abnormal sounds, you have successfully replaced the timing belt of your Toyota T100. If there are any indications of a problem such as noise, shock or slippage, you may need to repeat this process.
