4-24
b
VALVES AND VALVE SPRINGS
ENG
NOTE:
*****************************************************
*****************************************************
5. Measure:
S Runout (valve stem)
Out of specification Replace.
Runout limit:
0.03 mm
D When installing a new valve always replace
the guide.
D If the valve is removed or replaced always re-
place the oil seal.
6. Eliminate:
S Carbon deposits
(from the valve face and valve seat)
7. Inspect:
S Valve seats
Pitting/wear Reface the valve seat.
8. Measure:
S Valve seat width
a
Out of specification Reface the valve
seat.
Valve seat width:
Intake:
1.0 1.2 mm
<Limit>: 1.8 mm
Exhaust:
1.0 1.2 mm
<Limit>: 1.8 mm
Measurement steps:
D Apply Mechanic’s blueing dye (Dykem)
b
to
the valve face.
D Install the valve into the cylinder head.
D Press the valve through the valve guide and
onto the valve seat to make a clear pattern.
D Measure the valve seat width. Where the
valve seat and valve face made contact,
blueing will have been removed.
D If the valve seat is too wide, too narrow, or the
seat is not centered, the valve seat must be
refaced.
To Next Page