Toyota Land Cruiser

 Service Manual

Engine Mechanical
Valve clearance

INSPECTION

HINT: Inspect and adjust the valve clearance when the engine is cold.

1. DRAIN ENGINE COOLANT

2. REMOVE BATTERY CLAMP COVER

3. REMOVE V-BANK COVER

4. REMOVE AIR CLEANER AND INTAKE AIR CONNECTOR ASSEMBLY

5. REMOVE NO.3 TIMING BELT COVERS ( EM-15 )

6. REMOVE IGNITION COILS ( IG-6 )

7. REMOVE RH CYLINDER HEAD COVER

 

Remove the 9 bolts, the 9 seal washers and the cylinder head cover

8. REMOVE LH CYLINDER HEAD COVER

(a) Remove the oil dipstick for the transmission.

(b) Disconnect the PCV hose.

(c) Disconnect the engine wire clamp from the wire bracket on the cylinder head cover.

(d) Remove the 9 bolts, the 9 seal washers and the cylinder head cover.

9. SET NO.1 CYLINDER TO TDC/COMPRESSION

(a) Turn the crankshaft pulley, and align its groove with timing mark "0" of the No.1 timing belt cover.

(b) Check that the timing marks of the camshaft timing pulleys and that of the timing belt rear plates are aligned.

If not, turn the crankshaft 1 revolution (360) and align the mark as above.

10. INSPECT VALVE CLEARANCE

(a) Check only the valves indicated.

Using a feeler gauge, measure the clearance between the valve lifter and the camshaft.

Record the out-of-specification valve clearance measurements. They will be used later to determine the required replacement adjusting shim.

Valve clearance (Cold):

Intake 0.15 - 0.25 mm (0.006 - 0.010 in.)

Exhaust 0.25 - 0.35 mm (0.010 - 0.014 in.)

(b) Turn the crankshaft 1 revolution (360) and align the mark as above (See procedure in step 9).

(c) Check only the valves indicated as shown. Measure the valve clearance. (See procedure in step (a))

11. ADJUST VALVE CLEARANCE

(a) Remove the timing belt ( EM-15 ).

(b) Remove the camshafts ( EM-35 ).

(c) Remove the valve lifter and adjusting shim.

(d) Determine the replacement adjusting shim size according to the following Formula and Charts:

• Using a micrometer, measure the thickness of the removed shim.
• Calculate the thickness of a new shim so that the valve clearance comes within the specified value.

T ........... Thickness of removed shim A ........... Measured valve clearance N ........... Thickness of new shim

Intake: N = T + (A - 0.20 mm (0.008 in.))

Exhaust: N = T + (A - 0.30 mm (0.012 in.))

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

HINT: Shims are available in 41 increments of 0.020 mm (0.0008 in.), from 2.00 mm (0.0787 in.) to 2.80 mm (0.1102 in.).

(e) Place a new adjusting shim on the valve.

(f) Place the valve lifter.

(g) Reinstall the camshafts ( EM-57 ).

(h) Reinstall the timing belt ( EM-22 ).

(i) Recheck the valve clearance.

12. REINSTALL CYLINDER HEAD COVERS

13. REINSTALL IGNITION COILS

14. REINSTALL NO.3 TIMING BELT COVERS ( EM-22 )

15. REINSTALL AIR CLEANER AND INTAKE AIR CONNECTOR ASSEMBLY

16. REFILL WITH ENGINE COOLANT

17. START ENGINE AND CHECK FOR LEAKS

18. RECHECK ENGINE COOLANT LEVEL

19. REINSTALL V-BANK COVER

20. REINSTALL BATTERY CLAMP COVER

Adjusting Shim Selection Chart (Intake)

Adjusting Shim Selection Chart (Exhaust)

CO/HC

Compression

Cylinder block

Disassembly

Cylinder head

Inspection

Installation

Replacement

Engine unit

Idle speed

Ignition timing

Timing belt

Valve clearance