Section 05 ENGINE (4-TEC)
Subsection 07 (CYLINDER HEAD AND VALVES)
3
R1503motr256A
1
2
TYPICAL
1. Valve guide leading end
2. Cylinder head bore
3. Jig
With a suitable jig press the valve guide into the
cold cylinder head as shown.
A
R1503motr257A
TYPICAL
A. Protrusion
VALVE GUIDE PROTRUSION
MINIMUM 12.4 mm (.4882 in)
MAXIMUM
12.8 mm (.5039 in)
NOTE: For lubrication of the reamer use only cut-
ting oil. Turn the reamer only forward, in cutting
direction, never backward. Clean the reamer at
short intervals from swarf, moving the reamer on-
ly while turning in cutting direction.
Ream the new valve guide with a reamer 6 mm
diameter.
Clean cylinder head carefully. Check that the valve
seat is concentric with the new guide axis (check
contact surface with engineer's blue).
Valve Face and Seat
1
2
R1503motr107A
3
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 on 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.
smr2004-Complete Line Up 269
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