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I was wandering how to change a timing chain on a 1991 v6 Toyota tocoma and if you had a diagram that you could e-mail me thanks.

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Hi, the procedures below are pasted from I have added information to the steps to explain and emphasize certain points. Please let me know if you have any questions, and thanks for using FixYa.

3VZ-E Engine

See Figures 1 through 10

WARNING This procedure requires tools which may not be in your tool box. Pulley extractors and a counter-holding bar are required. Do not attempt the procedure without these tools available.
I was wandering how to - jturcotte_714.gif

Fig. Fig. 1: Exploded view of the 3VZ-E engine timing belt routing

  1. Disconnect the negative battery cable and drain the coolant.
  2. Remove the radiator and shroud.
CAUTION When draining coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant may be reused unless it is contaminated or several years old.
  1. Remove the power steering belt and pump.
  2. Remove the spark plugs.
  1. Disconnect the air hoses at the air pipe.
  2. Disconnect the water bypass hose at the air pipe and then remove the water outlet.
  3. Remove the air conditioning belt. Remove the alternator drive belt, fluid coupling, guide and fan pulley.
  4. Disconnect the high tension cords and their clamps at the upper timing belt cover and then remove the cover and its three gaskets.
  5. Rotate the crankshaft pulley until the groove on its lip is aligned with the 0 on the lower timing belt cover. This should set the No. 1 cylinder at TDC of its compression stroke. The matchmarks on the camshaft timing pulleys must be in alignment with those on the upper rear timing cover. If not, rotate the engine 360° (one complete revolution).
  6. Remove the power steering pulley. Use the counter-holding tool to aid in removal of the crank pulley bolt. Remove the crankshaft pulley using a puller.
  7. Remove the fan pulley bracket and then remove the lower timing belt cover.
  8. If the belt is to be reused after removal, mark an arrow on the belt showing the direction of rotation. Make matchmarks on the side of the belt and the flanges of each pulley. These marks will be important at reassembly.

Fig. Fig. 2: Mark the position of the belt if it is to be reused

  1. Remove the timing belt guide and remove the tension spring.


Fig. Fig. 3: Remove the tension spring

  1. Loosen the idler pulley bolt and shift the idler to the left as far as it will go. Temporarily tighten the bolt and release tension from the belt. Slide the belt off the pulleys.

Fig. Fig. 4: Move the tensioner all the way to the left, then tighten the bolt

  1. Protect the belt at all times. Do not bend, twist or turn the belt inside out. Do not allow the belt to contact oil, grease or water.
  2. Examine the belt closely for cracking, loose teeth, separation or wear on the edges. If the belt is not virtually perfect, replace it.
  3. Check the idler pulleys for smoothness of rotation. Inspect the tension spring; correct length is 2.15 iI was wandering how to - jturcotte_718.gifn>

Fig. Fig. 5: Measure the length of the tension spring

To install:

  1. Make absolutely certain the marks on the camshaft pulleys are aligned with the marks on the rear belt cover. Check the lower belt pulley; align its mark with the mark on the oil pump housing.
  2. Install the timing belt onto the cam pulleys, idler pulley, water pump pulley and crank pulley. If reusing the original belt, take great care to align all the marks made before removal. Then, when installing the belt, keep belt tension first between the camshaft gears and then from the exhaust cam gear to the crankshaft gear--this is critical to the timing. All slack should be between the crankshaft gear and the intake cam gear, until the tensionI was wandering how to - jturcotte_719.gif take out the slack.


Fig. Fig. 6: Inspect the belt for any signs of damage

  1. Loosen the idler pulley bolt; move it as far to the right as it will go. Temporarily tighten it in position.
  2. Install the tension spring. Loosen the idle pulley bolt to the point that the idler pulley moves with the tension of the spring.
  3. Temporarily install the crankshaft pulley bolt. Turn the crankshaft clockwise two complete revolutions from TDC to TDC. Check that the mark on each pulley alI was wandering how to - jturcotte_720.gif the matching marks on the covers or housing.
jturcotte_720.gifI was wandering how to - jturcotte_721.gifig. 7: Always turn the engine in a clockwise direction

Fig. Fig. 8: After rotating the engine, ALL the timing marks must align perfectly

  1. Tighten the idler pulley bolt to 27 ft. lbs. (37 Nm).
  2. RemovI was wandering how to - jturcotte_722.gify bolt. Install the belt guide on the crankshaft pulley. The cupped side faces outward.


Fig. Fig. 9: Install the belt guide with the cupped side out

  1. Install the bottom belt cover with the two gaskets.tighten the bolts to (5 Nm).
  2. Install the fan pulley bracket and tighten it to 30 ft. lbs. (41 Nm).
  3. Install the upper cover and tighten the bolts 48 inch lbs. (5 Nm).
  4. Position the crankshaft pulley so the groove in the pulley is aligned with the woodruff key in the crankshaft. Tighten the bolt to 181 ft. lbs. (245 Nm).
  5. Install the fan pulley, guide, fluid coupling and alternator drive belt. Adjust the belt tension.
  6. Install the power steering pump and belt. Install the air conditioning belt. Adjust the belt tension.

Fig. Fig. 10: Apply sealant to the water outlet before installation

  1. Install the spark plugs.
  2. Install the radiator and fill with coolant.
  3. Road test the vehicle. Check for leaks. Recheck the ignition timing.

Posted on Jan 02, 2011


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