Canada - Engine - Loss of Power At High Engine RPMs

Bulletin
1237

Issue Date
2003-07-28

Reference
EM-03-004

Model
Celica

Year Range
2000 ~ 2002

Market
Canada

Component
EE

Subject:
VVTLI - INTERMITTENT VARIABLE LIFT OPERATION

In some cases, owners of 2000 - 2002 model year Celica GTS vehicles equipped with the 2ZZ-GE engine may complain of an intermittent slight loss of power and/or variable lift function at engine speeds over 6,000 rpm under high load. This can be caused if the bolt securing the rocker shaft separates, allowing the shaft to rotate in its bore. This rotation, when it occurs, can cause misalignment of the oil feed passages to the rocker shafts, resulting in a lack of variable lift operation and low power at higher engine rpm.

APPLICABLE VEHICLES:
- 2000 - 2002 model year Celica GTS vehicles equipped with 2ZZ-GE engine produced BEFORE the Production Change Effective VINs shown below.







PRODUCTION CHANGE INFORMATION:







PARTS INFORMATION:







REQUIRED TOOLS AND MATERIALS:

REPAIR PROCEDURE:







1. Remove Valve Cover
A. Disconnect the negative and then the positive battery terminal.
B. Remove the battery tie-down bracket and battery.
C. Remove the 4 bolts and No. 2 cylinder head cover. (Figure 1.)







D. Remove the wiring harness and protector from cylinder head cover. (Figure 3.)







E. Remove the ignition coils. (Figure 2.)







F. Disconnect the 2 PCV hoses from the cylinder head cover. (Figure 4.)







G. Remove drive belt.
a) Turn the drive belt tensioner slowly clockwise and loosen it. Then, remove the drive.belt and replace the drive belt tensioner slowly and carefully. (Figure 5.)







H. Remove the 2 nuts, 1 bolt and disconnect the No. 3 ventilation hose from the No. 1 ventilation pipe. (Figure 6.)
I. Remove the No. 1 ventilation pipe and gasket.







J. Remove the 9 bolts, pull back the wire harness protector, and remove the cylinder head cover and gasket. (Figure 7.)







K. Remove the O-ring from the cylinder head cover oil supply pipe. (Figure 8.)







2. Set No. 1 cylinder to TDC/compression.
A. Turn the crankshaft pulley, and align its groove with timing mark "0" of the timing chain cover. (Figure 9.)







B. Check that the point marks of the camshaft timing sprockets are in a straight line on the timing chain cover surface with the exhaust cam dot set one tooth above as shown in Figure 10. If not, turn the crankshaft one revolution (360�) and align the marks as explained.







3. Remove and inspect bolts to confirm separation. (Figure 11.)







4. Remove the bolts and oil control valve for VVTLi. (Figure 12.)







A. Remove the 4 bolts and 2 nuts. (Figure 13.)







B. Remove the oil control valve housing and gasket. (Figure 14.)







5. Paint matchmarks on cam sprockets and chain.







6. Remove drive belt tensioner.
A. Remove the bolt, nut and drive belt tensioner. (Figure 16.)







7. Remove timing chain tensioner.
A. Remove the securing nuts and he timing chain tensioner. (Figure 17.)







8. Remove exhaust cam drive sprocket. (Figure 18.)







9. Secure the timing chain to prevent the chain from falling into the timing chain cover







10. Remove intake camshaft assembly (also remove exhaust camshaft if exhaust rocker shaft bolt is separated).
A. Uniformly loosen and remove the 12 bearing cap bolts, in several passes, in the sequence shown, and remove the 5 bearing caps and intake camshaft. (Figure 20.)







11. Place shop rags between the timing chain cover and the cylinder head around the rocker shaft opening as shown in Figure 21.







12. Push or gently tap the rocker shaft out into the opening between the timing chain cover and head using a large punch and hammer. (Figure 22.)

NOTE:
Once the hole in the shaft is pushed past the end of the head, the separated piece of bolt will tend to bounce or fall out into the timing chain cover.

Seal the opening with rags to prevent losing a piece of the separated bolt down into the timing chain cover.







13. Be careful to push the rocker shaft only as far as the second hole where the piece of bolt is separated, and no further. (Figure 23.)







14. Once the hole is exposed, remove the separated piece of bolt and inspect for damage to the shaft or shaft housing. (Figure 24.)











15. Align the rocker shafts back in their correct positions (Figure 25) and install the rocker shaft set bolts (Figure 26).

Torque: 7.5 N-m (76 kgf-cm, 66 in.-lbf)).

HINT:
- Position the slit of the rocker shaft in the direction shown In Figure 25.
- Align the rocker shaft end with the cylinder head end.







16. Install the oil control valve housing.
A. Install the oil control valve filter.
B. Install the gasket and oil control valve housing with the 4 bolts and 2 nuts. (Figure 27.)

Torque: 9.0 N-m (92 kgf-cm, 80 In.-lbf)







17. Install camshaft(s).
A. Place the camshaft(s) on the cylinder head with the No. 1 cam lobes facing as shown in the illustration. (Figure 28.)







B. Install the bearing caps in their proper locations. (Figure 29.).

HINT:
Camshaft bearing caps have a number and front mark.







17. C. If you removed both camshafts, install and uniformly tighten the 20 bearing cap bolts. After tightening the No. 1 camshaft bearing cap hand tight, tighten the rest in several passes, in the sequence shown. (Figure 30.)

Torque: 18.5 N-m (189 kgf-cm, 14 ft-lbf)







D. If it was only necessary to remove the intake camshaft, install and uniformly tighten the 10 bearing cap bolts. After tightening the No. 1 camshaft bearing cap hand tight, tighten the rest in several passes, in the sequence shown. (Figure 31.)

Torque: 18.5 N-m (189 kgf-cm, 14 ft-lbf)







18. Install camshaft timing sprocket.
A. Align the knock pin hole in the exhaust camshaft timing sprocket with the knock pin of the camshaft. (Figure 32.)







B. Temporarily install the timing sprocket bolt.
C. Hold the hexagonal wrench head portion of the camshaft with a wrench, and tighten the timing sprocket bolt. (Figure 33.)

Torque: 54 N-m (551 kgf-cm, 40 ft-lbf)







19. Set No. 1 cylinder to TDC/compression.
A. Turn the crankshaft pulley, and align its groove with timing mark "0" of the timing chain cover. (Figure 34.)







B. Turn the hexagonal wrench head portion of the camshafts, and align the point marks of the camshaft timing sprockets. (Figure 35.)
C. Install timing chain ensuring there is no slack on the intake side of the chain.







20. Install chain tensioner.
A. Check the chain tensioner.
B. Release the ratchet pawl, fully push in the plunger and apply the hook to the pin so that the plunger cannot spring out. (Figure 36.)







C. Insert the tensioner with your hand until it reaches to the chamfered position and install nut temporarily. (Figure 37.)
D. Then, by tightening the nuts, insert the chain tensioner to the fully installed position.

HINT:
- If the hook Is released while pushing In, remove the tensioner and re-apply the hook again and push the tensioner in again.
- Be careful not to tear the 0-ring as It Is not serviceable separately.

b) Tighten the 2 nuts.
Torque: 9.0 N-m (92 kgf-cm, 80 in.-lbf).







21. Set chain tension.
A. Turn the crankshaft counterclockwise, and disconnect the knock pin plunger from the hook. (Figure 38.)







B. Turn the crankshaft clockwise, and check that the slipper is pushed by the plunger. (Figure 39.)







HINT: If the plunger does not spring out, press the slipper Into the chain tensioner with a screwdriver or your finger so that the hook Is released from the knock pin and the plunger springs out. (Figure 40.)

22. Check valve timing
A. Turn the crankshaft pulley, and align its groove with timing mark "0" of the timing chain cover.

NOTE:
Always turn the crankshaft clockwise unless otherwise directed.







B. Check that the point marks of the camshaft timing sprockets are in a straight line on the timing chain cover surface as shown in Figure 41. If not, turn the crankshaft one revolution (360°) and align the marks as explained above.







23. Install cylinder head cover.
A. Remove any old packing (FIPG) material.

HINT:
When FIPG on the head cover gasket side cannot be eliminated completely, replace the gasket.

B. Apply seal packing (P/N 00295-00103 or equivalent) to 2 locations as shown in Figure 42.
C. Install the gasket on the cylinder head cover.

HINT:
Part must be assembled within 3 minutes of application. Otherwise, the material must be removed and reapplied.

D. Install a new O-ring on the cylinder head cover oil feed tube.







E. Install the cylinder head cover with the 9 bolts. Uniformly tighten the bolts, in several passes. (Figure 43.)

Torque: 10 N-m (100 kgf-cm, 7 ft-lbf)

F. Connect the 2 PCV hoses to the cylinder head cover.







24. Install a new gasket and the No. 1 ventilation pipe with 2 nuts and bolt. (Figure 44.)

Torque:
Nut: 10 N-m (100 kgf-cm, 7 ft-lbf)
Bolt: 25 N-m (255 kgf-cm, 18 ft-lbf)

25. Connect the No. 3 ventilation hose to the No. 1 ventilation pipe.







26. Install the 2 bolts and the wire harness protector. (Figure 45.)







27. Install ignition coils (with igniter).
A. Install the 4 bolts. (Figure 46.)
B. Connect the 4 ignition Coil connectors.

Torque: 9.0 N-m (92 kgf-cm, 80 in.-lbf)







28. Install the PCV hoses. (Figure 47.)







29. Install the No. 2 cylinder head cover with the 4 bolts. (Figure 48.)







30. Install the drive belt tensioner and belt. (Figure 49.)
A. Re-attach the tensioner assembly.

After replacing the belt tensioner assembly:

B. Fit a wrench on the hexagonal portion of the belt tensioner swing arm.
C. Slowly move the belt tensioner a least 4 times through its full stroke. (It should take at least 3 seconds to work it though one full stroke.) This will release any air from the tensioner assembly and prime it for proper operation.

31. Install the battery and tie-down.
32. Install the positive and then the negative battery cables.







REPAIR TIME:

NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.