TM 5-3810-289-34
adhesive.
camshaft gear. It is supported in the block by three
(2) Secure gear cover to mounting plate and
bearings and is positioned by a thrust plate secured to
block with lockwashers and capscrews, figure 3-182.
the cylinder block. The cams which actuate the inlet and
Tighten to 30/35 ft.-lbs torque.
exhaust valves are forged integrally with the shaft. The
camshaft and camshaft gear can be removed as a unit if
3-40. Gear Cover Mounting Plate
desired after the timing gear cover has been removed.
a.
Removal.
Remove capscrews and
b. Removal of Camshaft.
lockwashers securing plate to block (fig. 3-184). Tap
(1) Since the crankshaft oil slinger partially
plate from block with lead or plastic hammer. Discard
covers the camshaft gear, remove slinger mounting
gasket.
capscrews and lockplates, (fig. 3-186 and remove
b. Inspection. Inspect mounting plate for any
slinger from crankshaft; discard lockplates.
cracks or defects.
(2) Remove capscrews and lockwashers
c. Installation.
(accessible through openings in camshaft gear) securing
(1) Be sure old gasket material is removed
camshaft retainer bearing to block.
from mounting plate; position a new plate-to-block
(3)
Rotate camshaft gear slightly to
gasket on back of plate with gasket adhesive.
disengage gear teeth while carefully pulling camshaft,
(2) Mount plate over dowels, figure 3-185,
camshaft gear and bearing plate from block. Refer to
and secure with lockwashers and capscrews; tighten to
30/35 ft.-lb.
c. Cleaning and Inspection of Camshaft.
(1) Steam clean camshaft assembly.
(2)
Check camshaft journals with
micrometers. Refer to figure 3-188.
(3) Replace camshaft if journals are worn
beyond limits given in table 2-2.
(4) Replace camshafts that have scuffed,
scored, or cracked injector or valve lobes. Check by
magnetic inspection for possible cracks.
(5) Regrinding of camshaft lobes is not
recommended.
(6) Magnetic inspection.
(a) These instructions apply to the magnetic
particle inspection using "Magnaflux" or equivalent. The
camshafts should be tested by the active or continuous
method. That is, the whole surface must be wetted with
the magnetic particle suspension before the magnetizing
Figure 3-184. Gear cover mounting plate removal.
current is applied. Shafts must be magnetized by a
single "shot" of current.
Figure 3-185. Gear cover mounting plate installation.
Figure 3-186. Oil slinger capscrews removal.
3-41. Bushings, Camshaft, Gears
a. General. The camshaft is located on the upper
left side of the cylinder block and is driven by the
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