Checking and adjusting the thermal clearances of the 1mz-fe engine valves

Using a 5mm socket wrench, unscrew the two nuts and remove the motor protection cover

Using an 8mm socket wrench, remove the intake manifold top (fig. 1).

Fig. 1. Removing the upper part of the intake manifold

Remove the ignition coils.

Remove the spark plugs.

Remove the cylinder head covers.

Disconnect the high voltage wires from the spark plugs, holding them only by the rubber lugs

Removing the cylinder head cover

Fig. 2. Removing the wiring protection

Disconnect the two crankcase ventilation hoses from the cylinder head cover.

Disconnect the two harness guard clips from the #2 timing belt cover mounting bolts.

Remove the four nuts, remove the spark plug tube seal.

Remove the two nuts at the front of the engine and disconnect the wiring protection from the front cylinder head (fig. 2).

Remove the cylinder head cover and gasket.

In order to minimize oil leakage, arrange the spark plug tube seals in the removal order to reinstall them correctly.

Setting the piston of the first cylinder to TDC of the compression stroke

Fig. 3. Alignment of the marks of the crankshaft pulley with the marking "0" on the timing belt cover

Turning the crankshaft pulley, align the notch on the pulley with the installation marking "0" on the timing belt cover No. 1 (Fig. 3).

Checking valve clearances

Fig. 4. Checking valve clearances

Check the thermal gaps in the valves shown in Figure 4.

Using a feeler gauge, measure the clearance between the cam and the valve lifter. Record the results.

These will be used later when determining the thickness of the shim.

Thermal clearance in the valves (on a cold engine):

  • inlet - 0.15–0.25 mm;
  • graduation - 0.25–0.35 mm.
Fig. 5. Checking valve clearances

Rotate the crankshaft 240° (2/3 turn) and check the clearance in the valves shown in figure 5.

Fig. 6. Checking valve clearances

Rotate the crankshaft again 240° (2/3 turn) and check the clearance in the valves shown in figure 6.

Adjustment of thermal clearances in valves

If necessary, adjust the valve clearance.

To do this, remove the shim.

Fig. 7. Proper location of the valve lifter

Rotate the camshaft so that the top of the cam is pointing up.

Position the valve lifter as shown in Figure 7.

Use special tool 09248-05410 (A) and 09248-05420 (B).

Fig. 8. Using special tools to adjust valve clearances

Using the special tool (A), press the tappet and place the special tool (B) between the camshaft and the tappet.

Remove the special tool (A).

Insert the special tool (B) at a slight angle and make sure that the markings on the special tool are positioned as shown in figure 8.

If the special tool (B) is inserted too deep, the shim may jam it.

To prevent this, insert it from the side of the intake valves at a slight angle.

Fig. 9. Removing the adjusting washer: 1 - special tool (B); 2 - magnetic rod

Remove the shim using a small screwdriver and a magnetic bar (fig. 9).

Fig. 10. Measuring the thickness of the shim

Using a micrometer, measure the thickness of the removed shim and determine the size of the new shim (fig. 10).

Calculate the thickness of the new shim so that the clearance in the valves is within the specified values:

  • thickness of the removed shim - T;
  • measured valve clearance - A;
  • The thickness of the new shim is N.


  • inlet - N \u003d T + (A - 0.2 mm);
  • graduation - N \u003d T + (A - 0.3 mm).

Choose a new shim with a thickness as close as possible to the calculated value.

Fig. 11. Installing the shim

Install the new shim into the pushrod with the stamped number on the shim facing down.

Using the special tool (A), press the pusher and remove the special tool (B) (fig. 11).

Fig. 12. Places where sealant is applied

Check the valve clearance again.

Remove the old sealing material and apply sealant to the cylinder head, in the places shown in figure 12.

Install the cylinder head covers.

Install and tighten the spark plugs.

Install the ignition coils.

Install upper intake manifold assembly.

Install the protective cover.