TM 10-4320-310-14
5-10.
INSPECT/REPLACE CYLINDER HEAD AND VALVE ASSEMBLY (Continued)
CLEANING/INSPECTION:
.
Dry cleaning solvent P-D-680 (safety or Stoddard's Solvent) is potentially
dangerous. Avoid repeated and prolonged breathing of vapors and skin
contact with the liquid. Do not use near open flame, arcing equipment, or
other Ignition sources. Always wear eye protection and protective clothing.
The flash point of P-D-680 Is 100°F to 138°F (38°C to 59°C).
Death or serious injury could occur if compressed air Is directed against the
skin. Do not use compressed air for cleaning or drying unless the pressure
Is/has been reduced to 30 psi (2.06 bar) or less. When working with
compressed air always use chip guards, eye protection, and other personal
equipment.
1
Clean all parts with a clean cloth dampened with dry cleaning solvent. Use wire brush where necessary. Dry with
compressed air.
2
Inspect all parts for cracks, rust, corrosion, and excessive heat damage.
3
Inspect for accumulated carbon around injector seat in cylinder head.
4
Replace cylinder head if it is damaged.
5
Measure rocker shaft (1) diameter. If rocker shaft
diameter is smaller than 0.7074 inch (17.967 mm), R
must be replaced.
6
Measure rocker bore bushing (2) inside diameter. If
rocker bore bushing inside diameter is greater than
0.7076 inch (17.974 mm), replace bushing (2).
7
Inspect rocker (3) radius. No flattening or brinelling is permitted on the rocker radius. If there is evidence of
flattening, the rocker must be replaced.
NOTE
When replacing rocker (3) you must also replace bushing (2). They are
replaced as an assembly. Bushing (2), however, can be replaced separately.
8
Inspect valve seats in cylinder head. If there is any evidence of damage, replace the cylinder head.
NOTE
Whenever a valve is replaced, the valve seat must be reconditioned.
9
Inspect valves. If there is any evidence of damage or distortion, replace valve and recondition valve seat.
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