Toyota Corolla 1970-1987 Repair Guide

Timing Chain and Tensioner

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REMOVAL & INSTALLATION



See Figures 1 through 5

Only the K-series and T-series engines covered by this manual are equipped with a timing chain. The diesel and the A-series engines are equipped with a timing belt. For timing belt procedures, please refer to the information found later in this section.

  1. Remove the drive belts.
  2.  
  3. Remove the crankshaft set bolt, then using a puller, remove the crankshaft pulley.
  4.  
  5. Remove the front cover as detailed earlier in this section.
  6.  
  7. On K-series engines, measure the timing chain slack using a spring scale. If the slack is more than 0.531 in. at 22 lbs. of tension, replace the chain and sprockets.
  8.  
  9. Remove the timing chain tensioner and vibration damper.
  10.  
  11. On K-series engines, remove the camshaft sprocket set bolt, then remove the timing chain and sprocket together. Use a gear puller to remove the crankshaft sprocket.
  12.  



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Fig. Fig. 1: Measuring the timing chain stretch with a spring scale



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Fig. Fig. 2: Measure the outer sides of the chain rollers with a vernier caliper

  1. On T-series engines remove the chain and both sprockets at the same time.
  2.  
  3. Measure the timing chain length with the chain fully stretched. It should be no more than 10.7 in. for K-series engines or 11.472 in. for T-series engines in any three positions. Wrap the chain around a sprocket. Using a vernier caliper, measure the outer sides of the chain rollers. If the measurement is less than 2.339 in. on the crankshaft sprocket or 4.480 in. around the camshaft sprocket, replace the chain and sprocket.
  4.  
  5. Installation for the K-series engines is performed in the following order:
    1. Install the camshaft sprocket.
    2.  
    3. Set the No. 1 piston to TDC and align the camshaft dowel pin with the mark on the thrust plate.
    4.  
    5. Install the timing chain around the two sprockets. Make sure that the marks on the sprockets are aligned with the marks (usually bright links) on the timing chain.
    6.  
    7. Install the timing chain and the two sprockets onto the shafts. Make sure the timing marks are aligned with the camshaft dowel pin and the mark on the thrust plate.
    8.  
    9. Install the timing chain tensioner and the vibration damper.
    10.  
    11. Installation of the remaining components is in the reverse order of removal.
    12.  

  6.  



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Fig. Fig. 3: Align the camshaft dowel pin and the mark on the thrust plate-K-series engines



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Fig. Fig. 4: Aligning the marks on the sprockets with the bright links on the chain



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Fig. Fig. 5: Align the timing marks with the chain and sprocket-T-series engines

  1. Installation for the T-series engines is performed in the following order:
    1. Align the key in the camshaft with the mark on the thrust plate. Face the key in the crankshaft straight up.
    2.  
    3. Install the timing chain around the two sprockets so that the bright links line up with the timing marks on the sprockets.
    4.  
    5. Install the chain and gears onto the shafts.
    6.  
    7. Squirt oil into the cylinder in the chain tensioner, then install it to the cylinder block.
    8.  
    9. Install the chain damper parallel to the chain so that there is a 0.020 in. space in between.
    10.  
    11. Installation of the remaining components is in the reverse order of removal.
    12.  

  2.  

 
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