TM 55-1930-209-14&P-21
(b) With a tapered leaf set of feeler gages (.0015-.0100 inch), measure flat on injector rise side of cam
lobes.
(c) If flats measure less than .003 inch, lobe is satisfactory in that respect.
(d) A slightly worn lobe may be stoned and smoothed over with a fine crocus cloth as long as wear is
within limit.
(3)
Inspect both faces of thrustwashers. If either face is scored or if thrustwashers are worn excessively,
replace washers. New thrustwashers are .208 to .210 inch thick. Clearance between thrustwasher and thrust shoulder of
shafts is .004 to .012 inch with new parts, or a maximum of.01 8 inch with used parts.
(4)
Also, examine surfaces which thrustwashers contact. If they are scratched but not severely scored,
smooth them down with an oil stone.
(5)
Inspect shaft bearings for excessive wear. Replace bearings if they are worn excessively or bushings have
been turned with bearing. Refer to Table 1-1 for bearing dimensions.
(6)
Clearance between new shafts and new bearings is .0045 to .006 inch or a maximum of .008 inch with
worn parts.
NOTE
Excessive clearance between shafts and their bearings will cause low oil pressure and
excessive backlash between gears.
NOTE
Oversize bearings and oversize shafts are available for use if bearing bores or bearings
must be ground.
(7)
Inspect camshaft and balance shaft timing gears for chipped teeth or other damage.
(8)
Repair by replacement of defective parts.
6-25
Camshaft and balance shaft bearing removal and repair
NOTE
Camshaft end bearings must be removed before intermediate bearings. Balance shaft
does not have intermediate or center bearings.
6-50
