Cylinder Head and Valves
02
020
35
RG,RG34710,87 –19–28NOV00–1/2
Grind Valve Seats
RG8311 –UN–06DEC97
Valve Seat Grinding Pilot
RG8312 –UN–06DEC97
Valve Seat Arbor and Grinding Stone
RG8313 –UN–21MAY98
Grinding Valve Seat
A—Pilot
B—Grinding Stone
C—Arbor
IMPORTANT: Valve seat grinding should only be
done by experienced personnel familiar
with equipment and capable of
maintaining required specifications.
ALWAYS keep valve guides and work
area clean when grinding valve seats to
maintain valve guide bore-to-seat
runout.
Grinding valve seats increases seat
width and valve recess in cylinder head.
DO NOT grind excessively. Only a few
seconds are required to recondition the
average valve seat. Dress grinding
stone as necessary to maintain
specified seat angle.
Support the weight of grinder to avoid
excessive pressure on the stone.
Blend or radius all sharp edges
0.50 mm (0.02 in.) maximum corner
break to eliminate burrs after grinding
valve seats.
1. Install appropriate pilot (A) in valve guide bore.
2. Install appropriate grinding stone (B) on arbor (C) and
position onto valve seat and pilot.
3. Using drill from JT05893 Heavy-Duty Seat Grinder Set,
grind valve seats to the following specifications:
Specification
Valve Seat Grinding—Contact
Angle 30°.....................................................................................................
Width 1.50—2.00 mm (0.059—0.079 in.)...................................................
Maximum Runout 0.16 mm (0.006 in.).......................................................
Continued on next page
CTM100 (06APR04)
02-020-35
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=107
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