TM 55-1930-209-14&P-21
(2)
Camshaft and balance shaft gears mesh with each other and run at same speed as crankshaft gear. Since
these two gears must be in time with each other, and two as a unit in time with crankshaft gear, letter O" is stamped on
one tooth of one of gears (Figure 6-23) with a corresponding mark on root of mating teeth of other gear.
(3)
Camshaft and balance shaft gears are keyed to their respective shafts and held securely against shoulder
on shaft by a nut.
(4)
Idler gear rotates on a double-row, tapered roller bearing mounted on a stationary hollow hub.
6-23
Camshaft and balance shaft removal and disassembly
a.
Removal
(1)
Remove engine assembly.
(2)
Remove cylinder head assembly (para 6-15).
(3)
Remove flywheel housing.
(4)
Wedge a clean rag between gears and remove gear retaining nut from each shaft.
(5)
Remove camshaft and balance shaft balance pulleys using a suitable puller.
(6)
Remove front balance weight cover (Figure 6-24) as follows:
(a) Remove cover to cylinder block attaching bolts.
(b) Tap cover and dowel pin assembly away from cylinder block.
(c) Remove all traces of old gasket material.
(7)
Remove front balance weights.
(8)
Remove thrustwasher between bearing and balance weight hubs.
(9)
Remove two retaining bolts that secure camshaft or balance shaft thrustwasher to cylinder block by
inserting a socket wrench through a hole in web of gear.
(10)
Remove lockscrews that secure camshaft intermediate bearings.
(11)
Use a puller to pull camshaft from cylinder block.
(12)
Pull balance shaft from cylinder block.
b.
Disassembly
(1)
Remove either shaft gear using a suitable puller.
(2)
Remove end plugs from camshaft to facilitate removal of foreign objects.
(a) Clamp camshaft in a vise equipped with soft jaws, being careful not to damage lobes or machined
surfaces of shaft.
(b) Make an indentation in center of end plug with a 31/64 inch drill (carboloy tip).
(c) Punch a hole as deeply as possible with a center punch to aid in breaking through plug.
6-48
