Engine Unit

3MZ-FE ENGINE MECHANICAL: ENGINE UNIT: INSPECTION

INSPECTION

1. INSPECT CAMSHAFT






(a) Inspect camshaft for runout.
(1) Place the camshaft on V-blocks.
(2) Using a dial indicator, measure the runout at the center journal.
Maximum circle runout:
0.06 mm (0.0024 in.)
If the runout is greater than the maximum, replace the camshaft.






(b) Inspect cam lobes.
(1) Using a micrometer, measure the cam lobe height.
Standard cam lobe height:






Minimum cam lobe height:






If the cam lobe height is less than the minimum, replace the camshaft.






(c) Inspect camshaft journals.
(1) Using a micrometer, measure the journal diameter.
Journal diameter:
26.959 to 26.975 mm (1.0614 to 1.0620 in.)
If the journal diameter is not as specified, check the oil clearance.
2. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY






(a) Clamp the camshaft in a vise on the hexagonal lobe.
(b) Check that the VVT-i does not turn.






(c) Cover all the oil ports with vinyl tape except the port on the advance angle side (nearest to the convex portion) shown in the illustration.
(d) Apply about 100 kPa (1 kgf/cm2, 14 psi) of air pressure to the port on the advance angle side.
(e) Turn the VVT-i to the advance angle side (the white arrow marked direction in the illustration) by hand.
(f) Check that the VVT-i moves freely within about 30° range. Do not move the VVT-i unit to the most retard angle position as the lock-pin will be engaged again.
(g) Turn the VVT-i by hand and lock it at the most retard angle position.
3. INSPECT CYLINDER HEAD SET BOLT






(a) Using vernier calipers, measure the tension portion diameter of the bolt.
Standard outside diameter:
8.95 to 9.05 mm (0.3524 to 0.3563 in.)
Minimum outside diameter:
8.75 mm (0.3445 in.)
If the diameter is less than the minimum, replace the bolt.
4. INSPECT TIMING BELT
NOTICE:
- Do not bend, twist or turn the timing belt inside out.
- Do not allow the timing belt to come into contact with oil, water or steam.
- Do not utilize timing belt tension when installing or removing the mounting bolt of the camshaft timing pulley.
NOTE: Check the belt for any defects, as shown in the illustration. Also, check the points below.





(a) If there is premature parting:
- Check for proper installation.
- Check the timing cover gasket for damage and proper installation.

(b) If the belt teeth are cracked or damaged, check if either camshaft is locked.
(c) If there is noticeable wear or cracks on the belt face, check if there are nicks on the side of the idler pulley lock and water pump.
(d) If there is wear or damage to only one side of the belt, check the belt guide and the alignment of each pulley.
(e) If there is noticeable wear on the belt teeth:
- Check the timing cover for damage.
- Check that the gasket has been installed correctly.
- Check for foreign objects on the pulley teeth. If there is any trouble in the belt condition, replace the timing belt.

5. INSPECT CAMSHAFT GEAR BACKLASH
(a) Install the camshaft timing gear assembly.
(b) Install the camshafts to the cylinder head.
NOTICE:
- Install without valves and sub-gear.
- Install with its timing mark matched.

(c) Set the dial indicator to the teeth of the intake camshaft at a right angle (90°).






(d) Measure the backlash of the camshaft timing gear at least 4 positions.
Standard backlash:
0.020 to 0.200 mm (0.0008 to 0.0079 in.)
Maximum backlash:
0.30 mm (0.0118 in.)
6. INSPECT CAMSHAFT THRUST CLEARANCE
(a) Install the camshafts.






(b) Using a dial indicator, measure the thrust clearance while moving the camshaft back and forth.
Standard thrust clearance:
0.040 to 0.090 mm (0.0016 to 0.0035 in.)
Maximum thrust clearance:
0.12 mm (0.0047 in.)
If the thrust clearance is greater than the maximum, replace the camshaft. If necessary, replace the bearing caps and cylinder head together.
7. INSPECT CAMSHAFT OIL CLEARANCE
(a) Clean the bearing caps and camshaft journals.
(b) Place the camshafts on the cylinder head.






(c) Lay a strip of Plastigage across each of the camshaft journal.
(d) Install the bearing caps.
Torque: 16 Nm (163 kgf-cm, 12 ft-lbf)
NOTE: Do not turn the camshaft.

(e) Remove the bearing caps.






(f) Measure the Plastigage at its widest point.
Standard oil clearance:






Maximum oil clearance:
0.10 mm (0.0039 in.)
If the oil clearance is greater than the maximum, replace the camshaft. If necessary, replace the bearing caps and cylinder head together.
NOTE: Completely remove the Plastigage.