The toothed timing belt is the one that mostly moves the camshafts and the intermediate shaft and in case it slips or breaks, it may alter the timing of the valves and the piston-to-valve contact may occur and result into severe damage to the engine. Thus, it is essential to make sure that tensioning is performed correctly and that wear or deterioration is checked on a regular basis. First, put the vehicle and engine into immobility by loosening the negative battery cable, setting on the parking brake, and chocking the rear wheels. Enhance the accessibility of the timing belt covers by eliminating the air cleaner housing ducting and crankcase breather hose. Lift the timing belt cover by pushing the metal spring clips open and the securing screws, then lifting the cover. Disassemble the V-belt and ribbed drive belt, align an engine with TDC on cylinder No. 1 with alignment markings and remove the retaining screws to take out the ribbed drive belt pulley. Disassemble the water pump pulley, the timing belt lower cover, and take the tension off the timing belt by loosening the tensioner mounting nut. Check the timing belt to identify the manufacturer rotation marks, and in case it seems to be reusable, put it back in the same position to avoid faster wear. Unbolt the belt using the sprockets, taking caution to maintain the sprockets in their correct timing position and examine the belt and sprockets to confirm the absence of any contamination or wear. Although the belt may be questionable, and may have covered over 36,000 miles, it is still better to replace the belt. In case installing the timing belt is not going to be done right away, put a warning sign on the steering wheel so that no one can start the engine. To install, make sure the timing marks of the crankshaft, camshaft, and intermediate shaft are positioned at TDC on the No. 1 cylinder. Install the timing belt by looping around the crankshaft sprocker with the ribbed drive belt pulley (temporarily) in place and ensure that the timing marks are correct. Insert the timing belt teeth into the crankshaft sprocket and position it across the intermediate shaft and camshaft sprockets taking note of direction of rotation markings. Bring the flat part of the belt on the roller with a tensioner, and ensure that the run in the front is straight, and then tighten the belt by turning the tensioner clockwise. Check the tension by turning the belt between the intermediate shaft and the camshaft sprockets making sure that they can turn 90 degrees. After the proper tension is determined, screw the tensioner locknut, turn the crankshaft two full revolutions to align the timing marks again and re-adjust the belt tension. Lastly, re-fit the ribbed drive belt pulley, water pump pulley, tighten the drive belts and disturb the negative battery cable.