Mazda Trucks 1972-1986 Repair Guide

Timing Belt Tensioner



  1. Loosen the alternator mounting bolts, release the belt tension and remove the alternator belt.
  3. Remove the attaching bolts and remove the upper front cover and gasket. Rotate the engine in the normal direction of rotation until the camshaft pulley mark aligns with the V-notch at the top of the front housing. The notch in the crankshaft pulley will now be aligned with the arrow on the front housing, unless the belt has jumped time.
  5. With brake pliers or another suitable tool, remove the tensioning spring. Now, remove the bolt from the tensioner and remove the tensioner.
  7. Inspect the tensioner for bearing wear. It should rotate freely and smoothly. If not, replace it.
  9. Make sure the belt remains engaged at all three sprockets and that crankshaft and camshaft sprockets are properly in time. Locate the tensioner on its swivel pin with the slot through which the mounting bolt passes centered over the bolt hole. Install the bolt, but do not tighten it.
  11. Install the tensioner spring. With a wrench on the crankshaft pulley, turn the engine in the normal direction of rotation (clockwise) exactly two full turns until the timing marks are again aligned. Torque the lockbolt to 28-38 ft. lbs.
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