Valve Clearance: Adjustments

1NZ-FE ENGINE MECHANICAL: VALVE CLEARANCE: ADJUSTMENT

ADJUSTMENT

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
2. REMOVE ENGINE UNDER COVER RH
3. REMOVE CYLINDER HEAD COVER NO. 2 Removal
4. REMOVE IGNITION COIL NO. 1 Removal
5. DISCONNECT VENTILATION HOSE Removal
6. DISCONNECT VENTILATION HOSE NO. 2 Removal
7. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY Removal
8. INSPECT VALVE CLEARANCE
HINT: Inspect the valve clearance when the engine is cold.

(a) Set the No. 1 cylinder to TDC/compression.

(1) Turn the crankshaft damper and align its timing notch with the timing mark "0" of the oil pump.

(2) Check that both timing marks on the camshaft timing sprocket and camshaft timing gear are facing upward, as shown in the illustration.
HINT: If not, turn the crankshaft 1 complete revolution (360°) and align the marks as above.

(b) Check the valves indicated in the illustration.
(1) Using a feeler gauge, measure the clearance between the valve lifter and camshaft.
Valve clearance (cold):
for intake
0.15 to 0.25 mm (0.006 to 0.010 in.)
for exhaust
0.25 to 0.35 mm (0.010 to 0.014 in.)
(2) Record any out-of-specification valve clearance measurements. They will be used later to determine the required replacement adjusting shim.
(c) Turn the crankshaft 1 complete revolution (360°) and align its timing notch with the timing mark "0" of the oil pump.

(d) Check the valves indicated in the illustration.
(1) Using a feeler gauge, measure the clearance between the valve lifter and camshaft.
Valve clearance (cold):
for intake
0.15 to 0.25 mm (0.006 to 0.010 in.)
for exhaust
0.25 to0.35 mm (0.010 to 0.014 in.)
(2) Record any out-of-specification valve clearance measurements. They will be used later to determine the required replacement adjusting shim.
9. ADJUST VALVE CLEARANCE

NOTE: When rotating the camshaft with the timing chain removed, rotate the crankshaft damper counterclockwise 40° from the TDC and align its timing notch with the matchmark of the timing chain cover to prevent the pistons from coming into contact with the valves.

(a) Remove the fan and generator V belt Removal.
(b) Remove the engine mounting insulator sub-assembly RH Removal.
(c) Set the No. 1 cylinder to TDC/compression.

(1) Turn the crankshaft damper and align its timing notch with the timing mark "0" of the oil pump.

(d) Place paint marks on the chain in the places where the timing marks of the camshaft timing sprocket and the camshaft timing gear are located.

(e) Using an 8 mm hexagon wrench, remove the screw plug.

(f) Insert a screwdriver into the service hole in the chain tensioner to pull the stopper plate of the chain tensioner upward.

(g) Using a wrench, rotate camshaft No. 2 clockwise to push in the plunger of the chain tensioner.

(h) Remove the screwdriver from the service hole, then align the hole in the stopper plate with the service hole and insert a 3 mm (0.12 in.) diameter bar into the holes to hold the stopper plate.
HINT:
- Fix the stopper plate using the bar while rotating the camshaft right and left slightly.
- Hold the bar with tape so that the bar does not come off.

(i) Using a wrench, hold the hexagonal lobe of camshaft No. 2 and remove the fringe bolt.

(j) Using several steps, loosen and remove the 11 bearing cap bolts uniformly in the sequence shown in the illustration, then remove camshaft bearing cap No. 1 and camshaft bearing cap No. 2.
NOTE: Loosen each bolt uniformly while keeping the camshaft level.

(k) Remove the fringe bolt and remove the camshaft timing sprocket.

(l) Remove camshaft No. 2.

(m) Using several steps, loosen and remove the 8 bearing cap bolts uniformly in the sequence shown in the illustration, then remove camshaft bearing cap No. 2.
NOTE: Loosen each bolt uniformly while keeping the camshaft level.

(n) Hold the chain by hand and remove the camshaft and the camshaft timing gear assembly.

(o) Tie the chain with a piece of string as shown in the illustration.
(p) Remove the 16 valve lifters.

(q) Using a micrometer, measure the thickness of the removed lifter.
(r) Calculate the thickness of a new lifter so that the valve clearance comes to within the specified values.

Valve clearance:
Intake A = B + (C - 0.20 mm (0.008 in.))
Exhaust A = B + (C - 0.30 mm (0.012 in.))
(s) Select a new lifter with a thickness as close to the calculated values as possible.
HINT: Lifters are available in 35 sizes in increments of 0.020mm (0.0008 in.), from 5.060 mm (0.1992 in.) to 5.740 mm (0.2260 in.).

Intake valve clearance (cold):
0.15 to 0.25 mm (0.006 to 0.010 in.)
EXAMPLE:
A 5.250 mm (0.2067 in.) lifter is installed, and the measured clearance is 0.400 mm (0.0158 in.). Replace the 5.250 mm (0.2067 in.) lifter with a new No. 46 lifter.
New Shim Thickness:

Exhaust valve clearance (Cold):
0.25 to 0.35 mm (0.010 to 0.014 in.)
EXAMPLE:
A 5.340 mm (0.2102 in.) lifter is installed, and the measured clearance is 0.440 mm (0.0173 in.). Replace the 5.340 mm (0.2102 in.) lifter with a new No. 48 lifter.
New Shim Thickness:

(t) Install the selected valve lifter.
(u) Apply a light coat of engine oil to the camshaft and camshaft journals.

(v) Install the chain onto the camshaft timing gear with the paint mark and the timing mark aligned as shown in the illustration.

(w) Examine the front marks and the numbers on camshaft bearing cap No. 2 and check that the sequence is as shown in the illustration. Then uniformly tighten the bolts in several steps in the sequence shown in the illustration.
Torque: 13 Nm (129 kgf-cm, 9.4 ft-lbf)
NOTE: Tighten each bolt uniformly while keeping the camshaft level.

(x) Install camshaft No. 2.

(y) Hold the chain, and align the timing mark on the camshaft timing sprocket with the paint mark of the chain.
(z) Align the alignment pin hole in the camshaft timing sprocket with the alignment pin of the camshaft, and install the sprocket onto the camshaft.

(aa) Provisionally install the flange bolt.

(ab) Examine the front marks and the numbers of camshaft bearing cap No. 1 and camshaft bearing cap No. 2 and check that the sequence is as shown in the illustration. Then uniformly tighten the bolts in several steps, in the sequence shown in the illustration.
for bearing cap No. 2 - Torque: 13 Nm (129 kgf-cm, 9.4 ft-lbf)
for bearing cap No. 1 - Torque: 23 Nm (235 kgf-cm, 17 ft-lbf)
NOTE: Tighten each bolt uniformly while keeping the camshaft level.

(ac) Using a wrench, hold the hexagonal lobe of camshaft No. 2 and install the flange bolt.
Torque: 64 Nm (653 kgf-cm, 47 ft-lbf)
(ad) Remove the bar from the timing chain tensioner.

(ae) Turn the crankshaft damper and align its timing notch with the timing mark "0" of the oil pump.

(af) Check that all the pairs of timing marks are aligned.
(ag) Apply adhesive to the 2 or 3 threads of the screw plug.
Adhesive:
Toyota Genuine Adhesive 1324, Three Bond 1324 or Equivalent

(ah) Using an 8 mm hexagon wrench, install the screw plug.
Torque: 15 Nm (153 kgf-cm, 11 ft-lbf)
(ai) Install the engine mounting insulator sub-assembly RH Installation. (for Hatchback)
(aj) Install the engine mounting insulator sub-assembly RH Installation. (for Sedan)
(ak) Install the fan and generator V belt Installation.
(al) Adjust the fan and generator V belt Installation.
(am) Inspect the fan and generator V belt Installation.
10. INSTALL CYLINDER HEAD COVER SUB-ASSEMBLY Installation
11. CONNECT VENTILATION HOSE NO. 2 Installation
12. CONNECT VENTILATION HOSE Installation
13. INSTALL IGNITION COIL NO. 1 Installation
14. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
Torque: 5.4 Nm (55 kgf-cm, 48 in-lbf)
15. CHECK FOR ENGINE OIL LEAKAGE
16. INSTALL CYLINDER HEAD COVER NO. 2 Installation
17. INSTALL ENGINE UNDER COVER RH