Inspection and Repair

1. Inspect for flatness using precision straight edge and feeler gauge, measure the surfaces contacting the cylinder block and the manifolds for warpage.
Maximum warpage:
Cylinder block side: 0.05 mm (0.0020 in)
Manifold side: 0.08 mm (0.0031 in)
If warpage is greater than maximum, replace the cylinder head.





2. Inspect for cracks using a dye penetrant, check the combustion chamber, intake ports, exhaust ports and cylinder block surface for cracks.
If cracked, replace the cylinder head.





3. Inspect and clean valve seats.
a. Using a 45° carbide cutter, resurface the valve seats. Remove only enough metal to clean the seats.





b. Check the valve seating position.
Apply a light coat of prussian blue (or white lead) to the valve face. Lightly press the valve against the seat. Do not rotate valve.
c. Check the valve face and seat for the following:
^ If blue appears 360° around the face, the valve is concentric. If not, replace the valve.





^ If blue appears 360° around the valve seat, the guide and face are concentric. If not, resurface the seat.
^ Check that the seat contact is in the middle of the valve face with the following width: 1.0 - 1.4 mm (0.039 - 0.055 in)

If not, correct the valve seats as follows:
(1) If the seating is too high on the valve face, use 30° and 45° cutters to correct the seat.





(2) If the seating is too low on the valve face. use 75° and 45° cutters to correct the seat.





d. Hand-lap the valve and valve seat with an abrasive compound.
e. After hand-lapping, clean the valve and valve seat.


NOTE: Toyota does not provide any information about replacing the spark plug tubes on the cylinder head.