Toyota 4-Runner 1985 Repair Manual page 53

EM-24
ENGINE MECHANICAL - Cylinder Head
• Remove the caps. Measure the Plastigage at its
widest point.
If clearance is greater than the maximum, replace,
head and/or camshaft.
Maximum clearance:
Standard clearance:
0.1 mm (0.004 in.)
0.01 - 0.05 mm
(0.0004 - 0.0020 in.)
• Clean out the pieces of Plastigage from the bear-
ings and journals.
15. INSPECT ROCKER ARMS
Check the clearance between the rocker arms and shaft
by moving the rocker arms as shown. Little or no move-
ment should be felt.
If movement is felt, disassemble the rocker arm assembly
and measure the oil clearance as follows:
(a) Disassemble rocker arm assembly.
• Remove the three screws.
• Slide the rocker stands, springs and rocker arms off
the shafts.
(b) Using a dial indicator, measure the inside diameter of
the rocker arm. Using a micrometer, measure the out-
side diameter of the shaft. Subtract the shaft diameter
from the rocker arm diameter.
If the oil clearance is not within specification, replace the
rocker arm and/or shaft.
Maximum oil clearance: 0.08 mm (0.0031 in.)
(c) Assemble the rocker arm assembly as shown, and in-
stall the three screws.
NOTE: All rocker arms are the same but all rocker stands
are different and must be assembled in the correct order.