TM 5-4310-368-14
b. Camshaft and Tappets. (Figure 6-16 and 6-19)
(1) Replace any tappets which show any sign of wear or scoring.
(2) Replace camshaft if journals or any cam lobe show any sign of wear or scoring.
NOTE
Do not install used tappets with a new camshaft. New tappets may be installed on a
used camshaft.
(3) Install tappets into same location in crankcase from which they were removed.
(4) Push tappets up against underside of crankcase. Hold in place with elastic band.
(5) Install camshaft into crankcase.
(6) Remove elastic bands from tappets.
c.
Cylinder Block. (Figure 6-19)
(1) Replace any cylinder block which has broken fins.
(2)
Measure cylinder bore and piston clearance. Replace or recondition cylinder blocks which do not meet
requirements shown in Figure 6-24.
(3) Replace any valve which shows signs of bending, warping, overheating or burning.
(4) Replace any valve seat which shows signs of damage or overheating.
(5) Check clearance between valve stem and valve guide. If clearance exceeds .008 inches, replace valve
guide.
(6) Grind face of each valve to an angle of 45
.
(7) Grind each valve insert to an angle of 45
.
(8) Lap each valve into its seat with valve lapping compound.
(9) Thoroughly clean cylinder block with dry cleaning solvent. Dry thoroughly.
WARNING
Dry cleaning solvent, P-D-680, used to clean parts is potentially dangerous to personnel
and property. Avoid repeated and prolonged skin contact. Do not use near open flame
or excessive heat. Flash point of solvent is 100F (38C) - 138F (59C).
(10)
Loose assemble valves, valve springs and valve spring retainers into correct location in cylinder block.
6-19
