timing belt and sprockets

8/8/2019 Timing Belt and Sprockets

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Timing Belt and SprocketsToyota Camry and Avalon 1997-2000

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Engine And Engine O...

ENGINE AND ENGINE OVERHAUL

The manufacturer recommends replacement of the timing belt (and water pump inspection),

undernormaloperating conditions, every 60,000 miles (96,000 km

If, however, the timing belt is inspected earlier or more frequently than suggested, and

shows signs of wear or defects, the belt should be replaced at that time.

WARNING

On all Camry and Avalon models it is very important to replace the timing belt at the recommended

intervals, otherwise expensive engine damage will likely result if the belt fails.

REMOVAL & INSTALLATION5S-FE Engines

1. Remove the timing belt covers as previously detailed.

2. Raise the engine just enough to remove the weight from the engine mount on the

right side.

3. Remove the thru-bolt, two nuts, and right hand mounting insulator.

4. Remove the retaining bolts and remove the right hand mounting bracket (from theside the alternator was removed from).

5. Remove the timing belt and timing belt guide. If the timing belt is to be reused, drawa directional arrow on the timing belt in the direction of engine rotation (clockwise)

and place matchmarks on the timing belt and crankshaft gear.

6. Remove the bolt retaining the No. 1 idler pulley and tension spring.

7. Remove the No. 2 idler pulley.

8. Remove the crankshaft timing gear , if it can not be removed by hand, use two flat

bladed tools to pry it off. Make sure to position shop rags to prevent damages to thecomponents.

9. Remove the nut retaining the oil pump pulley.

To install:

10.Align the cutouts of the oil pump pulley and shaft, and slide the pulley on. Retain the

pulley while tightening the nut to 21 ft. lbs. (28 Nm).

11.Align the crankshaft timing pulley set key with the key groove of the crankshaft

pulley, then slide the pulley on.

12. Install the No. 2 idler pulley with the bolt and tighten to 31 ft. lbs. (42 Nm). Be surethe pulley moves smoothly.

NOTERemove any oil or water on the idler pulley and keep it clean.
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13.Temporarily install the No. 1 idler pulley with the retaining bolt. Hint: use a 1.65 inch(42mm) bolt in length. Do not tighten the bolt yet. Install the tension spring. Pry the

pulley toward the left as far as it will go, then tighten the bolt.

14. Turn the crankshaft until the key groove in the crankshaft timing pulley is facing

upward. Install the timing belt on the crankshaft timing, oil pump, No. 2 idler andwater pump pulleys.

NOTEIf the old timing belt is being reinstalled, make sure the directional arrow is facing in the original direction

and that the belt and crankshaft gear matchmarks are properly aligned.

15. Install the lower (No. 1) timing belt cover and new gasket with the four bolts.

16.Align the crankshaft pulley set key with the pulley key groove. Install the pulley.Tighten the pulley bolt to 80 ft. lbs. (108 Nm).

17.Align the camshaft knock pin with the matchmarks on the oil seal retainer.

18.Align the knock pin with the groove of the pulley, and slide the pulley onto the

camshaft with the plate washer and set bolt.

19. Tighten the set bolt to 27 ft. lbs. (37 Nm).20.Turn the crankshaft pulley and align the 0mark on the lower (No. 1) timing belt

cover.

21. Install the timing belt and check the valve timing as follows:

1. Align the matchmarks that you made previously, and install the timing beltonto the camshaft pulley.

2. Loosen the No. 1 idler pulley set bolt1/2 turn.

3. Turn the crankshaft pulley two complete revolutions TDC to TDC. ALWAYSturn the crankshaft CLOCKWISE. Check that the pulleys are still in alignment

with the timing marks.

4. Tighten the No. 1 idler pulley set bolt to 31 ft. lbs. (42 Nm).5. Make sure there is belt tension between the crankshaft and camshaft timing

pulleys.

22. Install the upper (No. 2) timing cover with a new gasket(s).

23.Align the two clamps for the engine wiring harness with the cover mounting bolts.

24. Install the spark plugs.

25. Install the right mounting insulator with bracket. Tighten the bracket bolts to 38 ft.

lbs. (52 Nm), insulator nuts to 38 ft. lbs. (52 Nm) and thru-bolt to 52 ft. lbs. (71Nm).

26. Install the No. 2 engine mount bracket and tighten to 38 ft. lbs. (52 Nm); install thecontrol rod and tighten the bolts to 47 ft. lbs. (64 Nm).

27.Lower the engine.

28. Install the alternator and alternator bracket.

29. Install the drive belt and adjust the tension.

30. Install the cruise control actuator with bracket.

31. Install the fender apron seal and right engine under cover.

32. Install the right front wheel.


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1MZ-FE Engine

1. Remove the timing belt covers as described earlier in this section.

2. Remove the right engine mounting bracket by removing the nut and two bolts.

Remove the right engine mounting bracket bolts and nut . . .

. . . then lift the right engine bracket from the engine

3. Remove the crankshaft timing belt guide.

Slide the timing belt guide off the crankshaft pulley
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Place matchmarks on the pulley and cover

4. Temporarily install the crankshaft pulley bolt.

5. Turn the crankshaft and align the crankshaft timing pulley groove with the oil pumpalignment mark. Always turn the engine clockwise.

Turn the crankshaft clockwise to align the crankshaft timingpulley grove with the oil pump mark

6. Ensure the timing mark of the camshaft timing pulleys and rear timing belt cover arealigned. If not, turn the engine over an additional 360 .

Align the timing marks to set No. 1 cylinder to TDC
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If the timing marks are not aligned, turn the crankshaft one fullrevolution (360 degrees)

7. Remove the crankshaft pulley bolt.

NOTE

If the belt is to be reused, align the installation marks on the belt to the marks on the pulleys. If the marks

have worn off, make new ones.

Make sure the timing belt marks are aligned with the camshaftpulley and No. 3 timing belt cover

8. Alternately loosen the two timing belt tensioner bolts. Remove the tensioner anddust boot.

Unbolt the timing belt tensioner . . .
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. . . and only carry it in the upright position

9. Remove the timing belt.

Place a directional arrow on the belt if reusing it

Slip the belt off the lower and upper pulleys and extract it from

the engine

10.Using a spanner wrench, remove the right side camshaft timing pulley. Do the same

for the left side.
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Remove the camshaft pulley bolt and pulleys

Label the camshaft pulleys with an L and R to identify them

NOTEMake sure the left and right side camshaft pulleys are arranged on the table correctly. Do not mix them up!

It is recommended to mark them with an L and R.

11.Remove the bolt retaining the No. 2 idler pulley, the slide the pulley off.

Remove the No. 1 idler pulley and bolt


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Remove the bolt retaining the No. 1 idler pulley, then slide thepulley off

12.Using a 10mm hexagon wrench, remove the bolt and No. 1 idler pulley with plate

washer.

13.Remove the crankshaft bolt and timing belt plate. Using a gear puller, separate the

crankshaft pulley from the engine.

Remove the crankshaft timing belt plate . . .

. . . then remove the crankshaft pulley gear

NOTEDo not scratch the sensor portion of the crankshaft timing pulley.

14. Inspect the seal for leakage and replace if necessary.


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Look for seal leakage and replace if noticeable

To install:

15.When installing the crankshaft timing pulley, along the pulley set key with the keygroove of the pulley, then slide the pulley on. Install the crankshaft timing pulley,

with the sensor side facing inward. Install the timing belt plate and tighten the boltto 69 inch lbs. (8 Nm).

Install the crankshaft timing pulley with the sensor facing inward

16. Install the No. 1 idler pulley using a 10mm hexagon wrench, install the plate washerand idler pulley with the pivot bolt. tighten the pivot bolt to 25 ft. lbs. (34 Nm).

Check that the pulley moves freely.

17. Install the No. 2 idler pulley and tighten to 32 ft. lbs. (43 Nm). Check that the pulley

moves smoothly.

Install the No. 2 idler pulley with the bolt and washer in these

locations
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18. Install the right side camshaft timing pulley, face the flange side of the pulleyoutward. Align the knock pin on the camshaft with the knock pin groove of the timing

pulley, then slide the right hand camshaft pulley on. Install the pulley bolt andtighten to 65 ft. lbs. (88 Nm).

NOTEUse a torque wrench with a fulcrum length of 13.39 inch (340mm).

19. Install the left side camshaft timing pulley, face the flange side of the pulleyoutward. Align the knock pin on the camshaft with the knock pin groove of the timing

pulley, then slide the left side camshaft pulley on. Install the pulley bolt and tightento 94 ft. lbs. (125 Nm).

20.Temporarily install the crankshaft pulley bolt of the crankshaft. Turn the crankshaft,and align the timing marks of the crankshaft timing pulley and oil pump body.

21.Using a spanner wrench, turn the camshaft pulley, align the timing marks of thetiming pulley and the No. 3 timing belt cover.

22.Remove any dirt or oil from the pulleys and keep them clean. Only wipe the pulleys.Face the front mark of the timing belt forward. align the installation mark on the belt

with the timing mark of the crankshaft timing pulley. Align the installation marks onthe timing belt with the timing marks on the camshaft timing pulleys.

23. Install the timing belt in the following order:

1. Crankshaft pulley

2. Water pump pulley

3. Left camshaft pulley

4. No. 2 idler pulley

5. Right camshaft pulley

6. No. 1 idler pulley

Install the timing belt components in this order

24. Inspect the tensioner prior to installation of the old one as follows:

1. Visually check for any oil leakage. If there is only the faintest trace of oil onthe seal on the push rod side, the tensioner is still useable.

2. Using force against an sturdy object facing upwards only, press the rod to see

if there is no movement. If the rod moves, replace the tensioner.

3. Using a press, slowly press the timing belt tensioner until the holes of the

pushrod and housing align. Insert a 1.27mm hexagon Allen wrench throughthe holes to preserve the setting position.
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Remove the boot from the tensioner

Measure the protrusion of the rod from the housing end

Press the rod facing upwards only to see if it moves
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Insert an Allen head wrench through the hole of the tensioner

25. Install the dust boot to the tensioner.

26. Install the tensioner with the two bolts. Alternately tighten and then tighten the boltsto 20 ft. lbs. (27 Nm). Remove the Allen wrench.

27.Turn the crankshaft clockwise and align the crankshaft timing pulley groove with the

oil pump alignment mark.28.Ensure the camshaft timing marks align with the timing marks on the rear timing

belt cover.

29. Install the timing belt guide.

30. Install the right engine mounting bracket and tighten the bolts to 21 ft. lbs. (28 Nm).

31. Install the No. 2 timing belt cover with the five bolts. Tighten the bolts to 74 inch lbs.(8 Nm).

32. Install the engine wire protector clamp to the No. 3 timing belt cover.

33. Install the engine wire protector to the No. 3 timing belt cover with the bolt.

34. Install the No. 1 timing belt cover by installing the four bolts. Tighten the bolts to 74

inch lbs. (8 Nm).

35. Install the crankshaft pulley. Tighten the bolt to 159 ft. lbs. (215 Nm).

36. Install the No. 2 alternator bracket. Tighten the nut to 21 ft. lbs. (28 Nm). Do not

tighten the pivot bolt at this time.

37. Install the No. 2 right engine mounting bracket and the moving control rod.

38. Install the right engine mounting stay.

39.Connect the two ground wire connectors.

40. Install and adjust the drive belts.

41. Install the coolant reservoir.

42. Install the right front splash shield and wheel assembly.43.Connect the negative battery cable.

44.Start the vehicle and check for any leaks.

45.Recheck the ignition timing.

INSPECTION

Inspect both sides of the timing belt. Replace the belt with a new one if any of the following

conditions exist:
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Hardening of the rubberback side is glossy without resilience and leaves no indentation when

pressed with a fingernail

Cracks on the rubber backing

Cracks or peeling of the canvas backing

Cracks on rib root

Cracks on belt sides

Missing teeth or chunks of teeth

Abnormal wear of belt sidesthe sides are normal if they are sharp, as if cut by a knife.

Never bend or twist a timing belt excessively, and do not allow

solvents, antifreeze, gasoline, acid or oil to come into contact with the belt

Check for premature parting of the belt

Check if the teeth are cracked or damaged
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Look for noticeable cracks or wear on the belt face

You may only have damage on one side of the belt; if so, the

guide could be the culprit

Foreign materials can get in between the teeth and causedamage

Inspect the timing belt for cracks, fraying, glazing or damage ofany kind
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Damage on only one side of the timing belt may indicate a faulty

guide

ALWAYS replace the timing belt at the interval specified by themanufacturer

If none of these conditions exist, the belt does not need replacement unless it is at therecommended interval. The belt MUST be replaced at the recommended interval.
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