Toyota 4Runner Timing Belt & Sprockets Replacing Procedure?

Timing Belt & Sprockets Replacing details for Toyota 4Runner.
The procedure is mentioned for All types of Toyota 4Runner Engine models.

The details as well as appropriate diagrams are mentioned:----


NOTE
If you operate your vehicle under conditions of extensive idling and or low speed driving for long periods of time; such as a taxi, police or delivery service, replace the belt every 60,000 miles (96,000 km).


CAUTION
Valve timing in any engine is important, but in a Dual Over Head Camshaft (DOHC) engine like this, it is critical. Improperly performed, cam timing belt replacement can ruin the engine. Work carefully and verify that all timing marks properly align before attempting to start the engine.

1. Disconnect the negative battery cable.
2. Remove the engine undercover.
3. Drain the engine coolant.
4. Remove the radiator assembly using the procedures found in this section.
5. Remove the throttle body cover.
6. Remove the intake air connector assembly.
7. Remove the drive belt, fluid coupling (fan clutch) and fan pulley.
8. Without disconnecting the power steering lines, unbolt the power steering pump and wire it out of the way.
9. Remove the drive belt idler pulley by removing the bolt, cover plate, then the pulley.
10. Remove the right side timing belt cover (Toyota calls it the -RH No. 3 Timing Belt Cover-).
11. Remove the left side timing belt cover (Toyota calls it the -LH No. 3 Timing Belt Cover-). Use care when detaching the camshaft position sensor wire.
12. Remove the timing belt cover that is next to the drive belt pulley position (Toyota calls it the -No. 2 Timing Belt Cover-).
13. Without disconnecting the refrigerant lines, unbolt the air conditioning compressor and wire it out of the way.
14. Unbolt the fan bracket. Use care. The bolts are different lengths with different head sizes. Identify and mark the bolts are they are removed so they can be installed in the same locations.
15. If reusing the timing belt, look for installation marks on the timing belt. Check that there are three installation marks on the timing belt by turning the crankshaft pulley clockwise. Look for marks at the crankshaft and camshaft pulleys. If the installation marks have disappeared, place a new mark on the timing belt before removing each part.
16. Loosen (but do not remove) the crankshaft pulley bolt. A holding tool may be needed to keep the crankshaft from turning as the bolt is broken loose.

2uz-FE Engine

Fig. Camshaft timing belt and related components-4.7L (2UZ-FE) Engine

Fig. If reusing the timing belt, check that these installation marks are on the timing belt-4.7L (2UZ-FE) Engine

Fig. A holding tool will be required when loosening the crankshaft and camshaft pulley bolts. A pin-type spanner is an adjustable tool adaptable to different sizes-4.7L (2UZ-FE) Engine

Fig. Measure the tensioner pushrod. If OK, compress the tensioner in a shop press and secure with a pin-4.7L (2UZ-FE) Engine

Fig. With the timing belt installed, turn the crankshaft exactly two complete turns and check the timing marks again. They must be properly aligned or the engine will be damaged

1. Set the engine up so No. 1 cylinder is at Top Dead Center (TDC) of the compression stroke, using the following as a guide:
   1. Turn the crankshaft pulley and align its groove with the timing mark 0of the No.1 timing belt cover.
   2. Check that the timing marks of the camshaft timing pulleys and timing belt rear plates are aligned. If not, then the No. 1 cylinder is not on the compression stroke. Turn the crankshaft clockwise exactly one revolution until the crankshaft pulley groove is aligned with the timing mark 0 of the No.1 timing belt cover.
   3. Now remove the crankshaft pulley bolt, using care not to allow the pulley to turn off TDC.
      
      WARNING

      Do NOT turn the crankshaft pulley.
2. Remove the timing belt tensioner, as follows:
   1. If reusing the timing belt, look for the installation marks. If the installation marks have disappeared, before removing the belt, paint two new installation marks on the timing belt to match the timing marks of the camshaft pulleys.
   2. When replacing the timing belt tensioner only, to avoid incorrect meshing of the timing pulley and timing belt, secure one of them with a string or wire, to keep the belt tight on the pulley. Place matchmarks on the timing belt and right side camshaft pulley.
   3. Alternately loosen the two bolts and remove them, then separate the belt tensioner and dust boot.
3. Disconnect the timing belt from the camshaft pulleys, noting the following:
   1. Using a spin spanner or equivalent tool that fits on the camshaft pulleys, loosen the tension spring between the left side and right side camshaft timing pulleys by slightly turning the left side camshaft pulley clockwise.
   2. Remove timing belt from the camshaft pulleys .
4. To remove the camshaft pulleys, use a pin spanner or equivalent tool to hold the camshaft pulleys and keep them from turning, loosen the pulley center bolts and remove the pulleys. Use care not to turn the pulleys.
5. Remove the alternator.
6. Remove the drive belt tensioner.
7. To remove the crankshaft pulley, the center bolt should have already been removed in a previous step. Using a suitable harmonic balancer-type puller draw the pulley from the nose of the crankshaft. Use care not to turn the crankshaft pulley from TDC.
8. Remove the lower timing belt cover (Toyota called it the No. 1 Timing Belt Cover).
9. Remove the timing belt guide and cover spacer.
10. Remove the timing belt from the engine. If reusing the timing belt, and the installation mark has disappeared from it, paint a new installation mark on the timing belt to match the dot mark of the crankshaft timing pulley.
11. If necessary, remove the idler pulleys and check them for smooth turning.
12. If it is necessary to remove the crankshaft timing belt pulley, use a suitable gear puller to draw the pulley from the nose of the crankshaft. Use care not to turn the crankshaft pulley from TDC.

To install:

1. Inspect the timing belt. Do NOT bend, twist or turn the timing belt inside out. Do NOT allow the timing belt to come into contact with oil, water, anti-freeze or solvents.
   1. If the belt teeth are cracked or damaged, check that one of the camshafts is locked.
   2. If there is noticeable wear or cracks on the belt face, check for nicks on the side of the idler pulley and water pump.
   3. If there is wear or damage on even one side of the belt, check the belt guide and the alignment of each pulley.
   4. If there is noticeable wear on the belt teeth, check the timing cover for damage and for foreign material on the pulley teeth.
2. If necessary, replace the timing belt. Do NOT use the timing belt tension when installing or removing the mount bolt of the camshaft timing pulleys.
3. Check the idler pulleys. Check seal for leaking lubricant. If necessary, replace the idler pulley. Check the belt tensioner for leaks. Push in on the tensioner pushrod. Check that it doesn-t move. If it does move, replace the tensioner. Measure the protrusion (the amount the pushrod sticks out of the tensioner. It should be 0.413-0.453 inch (10.5-11.5mm).
4. Inspect the water pump for leaks. See that the shaft turns smoothly, without play.
5. If removed, install the crankshaft timing belt pulley. Align the pulley key with the groove and install the pulley. It may be necessary to gently tap the pulley in place with a suitably sided socket or short length of pipe.
6. Install the idler pulleys. Use a small amount of thread-locking compound, Loctite®242, or equivalent, on the bolt threads. Tighten the bolts to 25 ft. lbs. (35 Nm). Verify that the idler pulleys turn smoothly.
7. Temporarily install the timing belt. Remove any oil or water on the crankshaft pulley, oil pump pulley, water pump pulley, both idler pulleys and keep them clean. Wipe them clean with a clean shop cloth. Do NOT use solvents. Align the installation mark on the timing belt with the timing mark on the crankshaft timing pulley. Install the belt on the crankshaft timing pulley and over the idler pulleys.
8. Install the timing belt cover spacer. Make sure the gasket (seal) is in position.
9. Install the timing belt guide, facing the cup side outward.
10. Install the timing belt cover and its four bolts.
11. Install the crankshaft pulley. Align the key with the slot and install the pulley. It may be necessary to gently tap the pulley in place with a suitably sided socket or short length of pipe.
12. Install the drive belt tensioner (this is not the timing belt tensioner). The bolt should be 4.18 inches (106mm) in length. Tighten the bolt and nuts to 144 inch lbs. (16 Nm).
13. Install the alternator.
14. Check the crankshaft pulley position. Check that the timing mark of the crankshaft pulley is aligned with the timing mark 0 on the lower timing belt cover.
15. Install the right and left camshaft timing pulleys. Align the dowel pin on the camshafts with the groove in the pulleys and slide on the pulleys. Use a pin spanner or other suitable tool to keep the pulleys from turning and torque the center bolts to 80 ft. lbs. (108 Nm). Wipe the pulleys clean of any oil or water. Use a clean shop cloth. Do NOT use solvent.
16. Install the timing belt to the camshaft pulleys using the following as a guide:
    1. Turn the left side pulley to align the installation mark on the timing belt with the timing mark on the camshaft pulley. Hang the belt on the pulley.
    2. Turn the left side pulley counterclockwise until there is tension between the crankshaft timing pulley and the left side camshaft timing pulley.
    3. Turn the right side pulley to align the installation mark on the timing belt with the timing mark on the camshaft pulley. Hang the belt on the pulley.
17. Using a shop press, compression the tensioner pushrod. It may take anywhere from 220-2200 pounds of pressure. Align the holes of the pushrod and housing and insert a 0.50 inch (1.27mm) hex wrench or other suitable stiff pin to secure the setting position of the pushrod. Release the press and install the dust boot. Install the belt tensioner and alternately tighten the bolts to 19 ft. lbs. (26 Nm). With the tensioner securely bolted in place, use pliers to pull the restraining pin from the belt tensioner.
18. Check the valve timing. Temporarily install the crankshaft pulley bolt. Slowly turn the crankshaft pulley two complete revolutions from TDC to TDC. Always turn the pulley clockwise. Verify that each pulley aligns with the timing marks. If the timing marks do not align, stop. Remove he timing belt and reinstall it. It can be see how important is was to make installation marks on the belt before removal, as described earlier.
19. When satisfied that all timing marks are correctly aligned, tighten the crankshaft pulley bolt to 180 ft. lbs. (245 Nm). A holding tool may be required to keep the pulley from turning as it is tightened.
20. Install the fan bracket. Use care to get the bolts installed in the correct location. Some bolts are 4.17 inch (106mm) long and have a 12mm head. Other bolts are 4.49 inch (114mm) long and have a 14mm head. Torque the bolts as follows:
    1. Bolts with a 12mm head are tightened to 12 ft. lbs. (16 Nm).
    2. Bolts with a 14mm head are tightened to 24 ft. lbs. (32 Nm).
21. If equipped with air conditioning, install the compressor.
22. Install No. 2 timing belt cover and tighten the two bolts to 12 ft. lbs. (16 Nm).
23. Install the right side timing belt cover, matching it with the fan bracket Tighten the bolts and nut to 66 inch lbs. (7.5 Nm).
24. Install the left side timing belt cover observing the following:
    1. Install the oil cooler pipe with the nut and bolt.
    2. Run the camshaft position sensor wire through the timing belt cover hole.
    3. Install the belt cover, matching it with the fan bracket.
    4. Tighten the bolts and nut to 66 inch lbs. (7.5 Nm).
    5. Install the sensor wire grommet to the cover and attach the sensor connector and secure to its bracket.
    6. Secure the remaining wire clamps for the engine harness, as required.
25. Install the drive belt idler pulley and torque the bolt to 30 ft. lbs. (39 Nm).
26. Install the power steering pump and torque the bolts to 156 inch lbs. (17 Nm).
27. Install the fan pulley, fan, fan clutch and drive belt.
28. Install the air connector assembly.
29. Install the throttle body cover.
30. Install the radiator assembly and fill with coolant.
31. Start the engine and check for leaks and abnormal noises.
32. Recheck the engine coolant.
33. Install the engine undercover.

5vz-FE Engine

Fig. Remove the upper timing belt cover-3.4L (5VZ-FE) Engine

Fig. Upper timing belt cover bolt locations-3.4L (5VZ-FE) Engine

Fig. Once the cover is removed, the timing belt and camshafts are in plain view-3.4L (5VZ-FE) Engine

Fig. Mark the installed position of the belt . . . -3.4L (5VZ-FE) Engine

Fig. . . . and direction of the camshaft-3.4L (5VZ-FE) Engine

Fig. View of the A/C bracket and bolts-3.4L (5VZ-FE) Engine

Fig. You may have to remove the A/C bracket . . . -3.4L (5VZ-FE) Engine

Fig. . . . to gain access to the rear timing belt tensioner bolt-3.4L (5VZ-FE) Engine

Fig. Carefully remove the timing belt tensioner -3.4L (5VZ-FE) Engine

Fig. View of the crankshaft pulley and bolt-3.4L (5VZ-FE) Engine

Fig. Lower timing cover, once removed from the vehicle-3.4L (5VZ-FE) Engine

Fig. Carefully remove the timing belt from the pulleys-3.4L (5VZ-FE) Engine

Fig. Exploded view of the timing belt and related components-3.4L (5VZ-FE) Engine

Fig. For proper installation and to avoid engine damage, all timing marks must align-3.4L (5VZ-FE) Engine

Fig. Measure the tensioner pushrod. If OK, compress it in a shop press and secure with a pin-3.4L (5VZ-FE) Engine

Fig. As a final check, verify that all of these timing marks are properly aligned-3.4L (5VZ-FE) Engine

1. Disconnect the negative battery cable.
2. Remove the engine undercover.
3. Drain the engine coolant.
4. Disconnect the upper radiator hose from the engine and radiator.
5. Remove the power steering pump from the engine.
6. Without disconnecting the refrigerant lines, remove the A/C compressor from the engine. Carefully secure out of the way with wire.
7. Loosen the fan with the fluid coupling (also called a fan clutch) and fan pulleys.
8. Remove the alternator belt.
9. Remove the No. 2 fan shroud. This is the small, semi-circular piece below the fan.
10. Remove the fan along with the fluid coupling and fan pulleys.
11. If equipped with air conditioning, remove the five bolts and take off the compressor bracket.
12. Remove the No. 2 timing belt cover using the following procedure:
    1. Disconnect the camshaft position sensor connector from the No. 2 timing belt cover.
    2. Disconnect the high-tension spark plug cable clamps from the timing belt cover.
    3. Remove the six bolts and take off the timing belt cover.
13. Remove the fan bracket as follows:
    1. Remove the power steering pump adjusting strut by removing the nut.
    2. Remove the fan bracket by removing the bolt and nut.
14. Set the No. 1 cylinder to TDC of the compression stroke as follows:
    1. Turn the crankshaft pulley and align its groove with the timing mark 0of the No. 1 timing belt cover.
    2. Check that the timing marks of the camshaft timing pulleys and the No. 3 timing belt cover are aligned. If not, turn the crankshaft pulley one revolution (360°).
       
       NOTE

       If reusing the timing belt, make sure that you can still read the installation marks. If not, place new installation matchmarks on the timing belt to match the timing marks of the camshaft timing pulleys.
15. Remove the timing belt tensioner by alternately loosening the two bolts. Remove the bolts, the tensioner and dust boot.
16. Remove the timing belt from the camshaft sprockets (also called timing belt pulleys).
17. If the timing belt pulleys must be removed, continue with this procedure. Ordinarily, the timing belt pulleys do not need to be removed just to replace the timing belt.
18. Using SST 09960-10010, or an equivalent pin spanner-type tool, hold the pulley in place and remove the pulley bolt, camshaft timing pulley, and the small pin (Toyota calls it a -knock pin-) that locates the pulley to the camshaft. Remove both camshaft timing pulleys in this manner.
19. To remove the timing belt lower cover (Toyota calls it the No. 1 timing belt cover), first the crankshaft pulley must be removed. Use the following procedure:
    1. Using SST 09213-54015 and 09330-00021, or equivalent holding tool to keep the crankshaft from turning, loosen the pulley center bolt.
    2. Remove the holding tool, the pulley bolt, and the pulley.
20. Remove the starter wire bracket and the No. 1 timing belt cover.
21. Remove the timing belt guide and remove the timing belt from the engine.
22. Remove the bolt and the No. 2 idler pulley.
23. Remove the pivot bolt, the No. 1 idler pulley, and the flat washer.
24. Remove the crankshaft timing belt pulley. It should pull off. If not, use the gear puller to coax the pulley from the front of the crankshaft.

To install:

1. Clean all parts well. Do NOT bend or turn the timing belt inside out. Check the belt for cracks or deterioration. Take care to keep solvents, oil, water and anti-freeze off the timing belt. If contaminated, the belt must be replaced.
2. Inspect the idler pulleys. Check around the seals for oil leakage. Check that the pulley turns smoothly. Replace the idler pulley if necessary.
3. Inspect the timing belt tensioner. Check the seal for signs of leakage. Hold the tensioner securely ands and push the pushrod strongly to check that it doesn-t move. If the pushrod moves, replace the tensioner. NEVER hold the tensioner pushrod facing downward. Measure the protrusion of the pushrod from the housing end. It should stick out 0.394-0.425 inch (10.0-10.8mm). If not as specified, replace the tensioner.
4. Install the crankshaft timing belt pulley. Align the key in the crankshaft groove with the key groove of the timing pulley. Slide the timing pulley onto the crankshaft with the flange side inward. The toothed flange is for the crankshaft position sensor and must be positioned properly to line up with the sensor. Use care not to bend or damage this toothed flange.
5. Install the flat washer and the No. 1 idler pulley with the pivot bolt and tighten to 26 ft. lbs. (35 Nm). Check that the pulley bracket moves smoothly.
6. Install the No. 2 timing belt idler with the bolt. Tighten the bolt to 30 ft. lbs. (40 Nm). Check that the pulley bracket moves smoothly.
7. Temporarily install the timing belt, as follows:
   1. Using the crankshaft pulley bolt, turn the crankshaft and align the timing marks on the crankshaft timing pulley and the oil pump body.
   2. Align the installation mark on the timing belt with the dot mark of the crankshaft timing pulley.
   3. Install the timing belt on the crankshaft timing pulley, No. 1 idler, and the water pump pulleys.
8. Install the timing belt guide with the cup side facing outward.
9. Install the No. 1 timing belt cover and starter wire bracket. Tighten the timing belt cover bolts to 80 inch lbs. (9 Nm).
10. Install the crankshaft pulley as follows:
    1. Align the pulley key with the key groove of the crankshaft pulley.
    2. Install the pulley bolt and tighten it to 217 ft. lbs. (300 Nm). A holding tool will be required to keep the pulley from turning.
       
       NOTE

       The left side camshaft pulley is to be installed next. Do NOT install the right side pulley yet since the camshafts must be timed. Follow the procedure closely.
11. Install the left camshaft timing pulley as follows:
    1. Slide the timing pulley onto the end of the camshaft with the flange side facing outward.
    2. Align the hole in the camshaft with the retaining pin groove of the timing belt pulley.
    3. Install the retaining pin to the camshaft.
    4. Tighten the pulley bolt to 81 ft. lbs. (110 Nm).
12. Set the No. 1 cylinder to TDC of the compression stroke as follows:
    1. Turn the crankshaft pulley, and align its groove with the timing mark 0of the No. 1 timing belt cover.
    2. Turn the right side camshaft and align the retaining pin hole of the camshaft with the timing mark of the No. 3 timing belt cover.
    3. Turn the left side camshaft timing pulley and align the timing marks of the camshaft timing pulley and the No. 3 timing belt cover.
13. Install the timing belt to the left camshaft timing pulley. Check that the installation mark on the timing belt is aligned with the end of the No. 1 timing belt cover as follows:
    1. Using SST 09960-01000 or equivalent pin spanner tool, slightly turn the left camshaft timing pulley clockwise. Align the installation mark on the timing belt with the timing mark of the camshaft timing pulley, and hang the timing belt on the left camshaft timing pulley.
    2. Align the timing marks of the left camshaft pulley and the No. 3 timing belt cover.
    3. Check that the timing belt has tension between the crankshaft timing pulley and the left camshaft timing pulley.
14. Install the right camshaft timing pulley and the timing belt as follows:
    1. Align the installation mark on the timing belt with the timing mark of the right camshaft timing pulley, and hang the timing belt on the right camshaft timing pulley with the flange side facing inward.
    2. Slide the right camshaft timing pulley on the camshaft. Align the timing marks on the right camshaft timing pulley and the No. 3 timing belt cover.
    3. Align the retaining pin hole in the end of the camshaft with the pin groove of the pulley and install the retaining pin. Install the bolt and tighten to 81 ft. lbs. (110 Nm).
15. Set the timing belt tensioner as follows:
    1. Using a shop press, slowly press in the pushrod. A considerable amount of force may be required, as much as 220-2,200 lbs. (981-9,807 N) of force.
    2. Align the holes of the pushrod and housing, pass a 1.5mm hexagon wrench or similar strong retaining pin through the holes to keep the setting position of the pushrod.
    3. Release the press and install the dust boot to the tensioner.
16. Install the timing belt tensioner and alternately tighten the bolts to 20 ft. lbs. (28 Nm). Using pliers, remove the 1.5mm hexagon wrench or other retaining pin used to contain the tensioner, from the belt tensioner.
17. Check the valve timing as follows:
    1. Slowly turn the crankshaft pulley two revolutions from the TDC to TDC. Always turn the crankshaft pulley clockwise.
    2. Check that each pulley aligns with the timing marks. If the timing marks do not align, the job must be done over. Remove the timing belt and reinstall it.
18. Install the fan bracket with the bolt and nut.
19. Install the power steering adjusting strut with the nut.
20. Install the No. 2 timing belt cover. Tighten the bolts to 80 inch lbs. (9 Nm).
21. Connect the clamps for the spark plug wires to the No. 2 timing belt cover.
22. Connect the camshaft position sensor connector to the No. 2 timing belt cover.
23. If equipped, install the A/C compressor bracket.
24. If equipped, install the A/C compressor.
25. Install the fan with the fluid coupling and fan pulleys. Tighten the nuts to 48 inch lbs. (6 Nm).
26. Install the fan shroud.
27. Install the alternator drive belt.
28. Install the cooling fan and tighten the nuts to 48 inch lbs. (6 Nm).
29. If equipped, install and adjust the A/C drive belt.
30. Install the power steering pump, the pump pulley, and the drive belt.
31. Connect the upper radiator hose.
32. Install the engine undercover.
33. Fill the cooling system with coolant.
34. Connect the negative battery cable.
35. Start the engine and check for leaks.

These details will help.

Thanks.

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Car repair guide?

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