Cylinder Head and Valves
02
020
37
RG,RG34710,89 –19–13AUG99–1/1
Measure Valve Seat Bore in Cylinder Head
RG8315 –UN–21MAY98
Measuring Valve Seat Bore
1. Measure valve seat bores in cylinder head and
compare with specifications given below.
Specification
Intake and Exhaust Valve Seat
Bore—ID 49.424 ± 0.013 mm (1.9458 ±
0.0005 in.)
.....................................................
Bore Depth 11.50 mm (0.443 in.)...............................................................
Radius at Lower Bore 0.64 ± 0.25 mm (0.025 ± 0.001
in.)
..............................
Standard Intake and Exhaust
Valve Seat—OD 49.487—49.513 mm
(1.9483—1.9493 in.)
........................................................
2. If valve seat bores are not within specification, oversize
seat inserts are available. Have a qualified machine
shop bore the valve seat to specification for installation
of oversize valve seat inserts. (See INSTALL VALVE
SEAT INSERTS, later in this group.)
CTM100 (06APR04)
02-020-37
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=109
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