Toyota Pick-ups/Land Cruiser/4Runner 1989-1996

Timing Gears

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See Figures 1 through 7

This procedure applies to 3F-E engines only.

  1. Remove the timing gear cover and gasket.
  2.  
  3. Using a flat-bladded tool and a hammer, tap out the old oil seal from the cover.
  4.  
  5. Check the timing gear backlash. Using a dial indicator, measure the backlash at several places while turning the camshaft clockwise and counterclockwise.

    Standard backlash:0.0039-0.0072 in. (0.100-0.183mm)
     
    Maximum backlash:0.0098 in. (0.25mm)
     

  6.  



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Fig. Fig. 1: Use a dial indicator to check the timing gear backlash

  1. If the backlash is greater than the maximum, replace the camshaft and crankshaft timing gears.
  2.  
  3. Align the large (camshaft) gear so that the holes allow access to the camshaft retaining bolts. Remove the bolts and very carefully remove the cam with the gear attached. Use great care not to damage the bearing surfaces on the way out.
  4.  



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Fig. Fig. 2: Remove the camshaft retaining bolts through the access holes

  1. Tap out the gear set key.
  2.  



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Fig. Fig. 3: Carefully tap out the key

  1. With a puller or SST 09213-60017, remove the timing gear.
  2.  



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Fig. Fig. 4: Remove the gear by using an appropriate puller

  1. If necessary, remove the oil nozzle.
  2.  
  3. Use snapring pliers to remove the snapring holding the cam gear. Mount the camshaft in a press and, using the proper size tip on the press, press the cam out of the gear.
  4.  

To install:
  1. Clean all the gasket mating areas. With multi-purpose grease, install a new seal into the timing cover. A seal installer will be needed for this job such as 09223-50010.
  2.  
  3. Install the timing gear set key to the camshaft. Assemble the cam, thrust plate and timing gear. Use a press with the proper installation tool. Align the timing gear set key with the groove in the gear and press in the camshaft.
  4.  



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Fig. Fig. 5: A press must be used to remove and install the camshaft gear

  1. Install the snapring.
  2.  
  3. Use a thickness gauge to measure the thrust clearance between the thrust plate and camshaft. Correct clearance is 0.200mm-0.290mm (0.0079-0.0114 in.). Maximum allowance is 0.33mm (0.0130 in.).
  4.  
  5. Put the timing gear on the crankshaft with the timing gear facing forwards. Align the timing gear set key with the groove of the timing gear. Use a small mallet to tap the gear into place. Use a plastic mallet to tap in the pulley set key.
  6.  
  7. Turn the crankshaft timing gear clockwise to place the key groove upwards.
  8.  



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Fig. Fig. 6: Turn the crankshaft timing gear clockwise to place the key groove upwards

  1. Insert the camshaft into the block. Take great care not to damage the camshaft bearing surfaces on the way in.
  2.  
  3. Align the timing marks of the crankshaft and camshaft. Note that the one mark is on a tooth, the other in a valley. The tooth and valley must align exactly. Cylinder No. 6 should be at TDC compression if everything is set properly.
  4.  



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Fig. Fig. 7: Align the timing marks of the crankshaft and camshaft

  1. Install the two bolts holding the thrust washer to the block; tighten to 9 ft. lbs. (12 Nm).
  2.  
  3. Recheck the timing gear backlash.
  4.  
  5. Install the oil nozzle if it was removed. Make certain the oil hole points towards the gear mesh area. Use a hammer and small chisel to stake the threads of the oil nozzle.
  6.  
  7. Install the timing gear cover with a new seal and gasket.
  8.  

 
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