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Intake:
1.0 – 1.4 mm
(0.039 – 0.055 in.)
Exhaust:
1.0 – 1.4 mm
(0.039 – 0.055 in.)
Plastigage
2004 COROLLA (RM1037U)
ENGINE MECHANICAL
–
(b)
Intake:
(1)
60_
(c)
Exhaust:
45_
(1)
(d)
Hand–lap the valve and valve seat with an abrasive com-
pound.
(e)
Check the valve seating position.
75_
45_
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11.
INSPECT CAMSHAFT THRUST CLEARANCE
(a)
Install the 2 camshafts.
(b)
Using a dial indicator, measure the thrust clearance while
moving the camshaft back and forth.
Standard thrust clearance:
0.040 – 0.095 mm (0.0016 – 0.0037 in.)
Maximum thrust clearance: 0.110 mm (0.0043 in.)
If the thrust clearance is greater than maximum, replace the cyl-
inder head. If damages are found on the camshaft thrust sur-
A62900
faces, the camshaft also has to be replaced.
12.
INSPECT CAMSHAFT OIL CLEARANCE
(a)
Clean the bearing caps and camshaft journals.
(b)
Place the camshafts on the cylinder head.
(c)
Lay a strip of plastigage across each of the camshaft jour-
nal.
(d)
Install the bearing caps. (See page 14–45)
NOTICE:
Do not turn the camshaft.
(e)
Remove the bearing caps. (See page 14–45)
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(f)
Measure the plastigage at its widest point.
Standard oil clearance:
0.035 – 0.072 mm (0.0014 – 0.0028 in.)
Maximum oil clearance: 0.10 mm (0.0039 in.)
NOTICE:
Completely remove the plastigage after the measuring.
If the oil clearance is greater than maximum, replace the cylin-
der head.
A62902
CYLINDER HEAD ASSY
If the seating is too low on the valve face, use 60_
and 45_ cutters to correct the seat.
If the seating is too low on the valve face, use 75_
and 45_ cutters to correct the seat.
14–137
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