Section 05
ENGINE (4-TEC)
Subsection 08
(CYLINDER HEAD AND VALVES)
05-08-14
SMR2002_072_05_08A.FM
Replace valve guide if it is out of specification or
has other damages such as wear or friction sur-
face.
Valve Face and Seat
1. Valve seat
2. Exhaust valve contaminated area
3. Valve face (contact surface to valve seat)
– Check valve face and seat for burning or pittings
and replace valve or cylinder head if there are
signs of damage.
Ensure to seat valves properly. Apply some lap-
ping compound to valve face and work valve on its
seat with a lapping tool.
Measure valve face contact width.
NOTE:
The location of contact area should be in
center of valve seat.
Measure valve seat width, using a caliper.
If valve seat contact width is too wide or has dark
spots, replace the cylinder head.
A. Valve face contact width
B. Valve seat contact width
Installation
For installation, reverse the removal procedure.
Pay attention to the following details.
Install thrust washer
no. 30
, valve spring guide
no. 29
then valve stem seal
no. 28
.
VALVE GUIDE DIAMETER mm (in)
NEW MINIMUM
Exhaust
5.994 mm (.2359 in)
Intake
NEW MAXIMUM
Exhaust
6.018 mm (.2369 in)
Intake
SERVICE LIMIT
Exhaust
6.060 mm (.2386 in)
Intake
1
2
R1503motr107A
3
VALVE SEAT CONTACT WIDTH mm (in)
NEW
Exhaust
1.25 to 1.55 mm
(.049 to .061 in)
Intake
1.10 to 1.30 mm
(.043 to .051 in)
SERVICE LIMIT
Exhaust
2 mm (.078 in)
Intake
1.8 mm (.07 in)
V01C1HA
B
A
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Содержание GTX 4-TEC 5573 2002
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