Toyota 4-Runner 1985 Repair Manual page 48

ENGINE MECHANICAL -
Cylinder Head EM-19
6. INSPECT HEAD FOR FLATNESS
7.
8.
(a) Using a precision straightedge and feeler gauge, check
that the head and manifold surfaces are not warped.
(b) Measure warpage along the four edges and diagonally
as illustrated.
If warpage is greater than specified value, replace the head.
Maximum head surface warpage: 0.15 mm (0.0059 in.)
Maximum manifold surface warpage: 0.20 mm (0.0079 in.)
INSPECT CYLINDER HEAD FOR CRACKS
Using a dye penetrant, check the combustion chamber, in-
take and exhaust ports, head surface and the top of the head
for cracks.
If a crack is found, replace the head.
CLEAN VALVES
Use an old valve to chip any carbon from the valve head.
Using a gasket scraper, clean the valve thoroughly.
9. INSPECT VALVE STEM GUIDE WEAR
(a) Using a dial indicator or telescoping gauge, measure
the inside diameter of the valve guide.