TM 5-3810-300-24&P-3
1.7.2 CAMSHAFT, BALANCE SHAFT AND BEARINGS
almost engage the teeth of the idler gear. Use care
shaft front bearings (3 and 26) on the "B" and "C"
when installing the camshaft to avoid damaging the
engines.
cam lobes.
10. Turn the camshaft intermediate bearings until the
holes in the bearings are in alignment with the
NOTE: The right hand gear (viewing the
threaded holes in the cylinder block. In-stall the lock
engine from the flywheel end) whether it is
screws and tighten them to 15-20 lb-ft torque.
attached to the camshaft or balance shaft has
left-hand helical teeth.
11. Install the front balance weights on the shafts.
2. Align the timing marks on the mating gears as shown
12. Place an internal tooth lock washer on the end of
each shaft and start the nuts on both shafts.
gear in place.
13. Use a wood block (Fig. 3) between the balance
3. Secure the camshaft rear bearing to the cylinder
weights or wedge a clean cloth between the cam and
block with the three bolts and lock washers. The
balance shaft gears to prevent their turning. Tighten
camshaft gear may be turned to accommodate the
the nuts to 300-325 lb-ft torque.
bolts through the hole in the gear web (Fig. 4).
Tighten the bolts to 35-40 lb-ft torque.
14. Install the camshaft and balance shaft gear nut
retainers with the bolts and lock washers. Tighten
4. Insert the balance shaft in the bore in the cylinder
the bolts to 35-39 lb-ft torque.
block and push it in until the teeth of the balance
shaft gear almost engage the camshaft gear teeth.
15. Check the clearance between the thrust washer and
the thrust shoulder of both the camshaft and balance
5. Align the timing marks on the mating gears as shown
shaft. The specified clearance is .004" to .012" with
new parts, or a maximum of .018" with used parts.
shaft gear into place.
16. Check the backlash between the mating gears.
6. Secure the balance shaft rear bearing. Use the
same procedure as outlined for the camshaft rear
17. Reinstall the parts, accessories and assemblies that
bearing, Step 3.
were removed from the engine and refill the cooling
system.
7. Apply grease to the steel face of each thrust washer.
Then, place a thrust washer against the inner end of
the camshaft and balance shaft front end bearing
Install
Camshaft
(Flywheel
Housing
and
("B" and "C" engines). The steel face of the thrust
washer must be against the bearing.
Transmission in Place)
8. Install the camshaft and balance shaft front end
1. On the "A" and "IY' engines, apply grease to the steel
bearings with the bolts and lock washers. Tighten
face of the thrust washer and install it with the steel
the bolts to 35-40 lb-ft torque.
face against the bearing.
CAUTION: Install the front bearings with care
2. Install a Woodruff key in the drive gear end of the
to avoid dislodging the thrust washers. Do not
camshaft and insert this end into position from the
hammer the bearings into the cylinder block.
front end of the engine. Push the shaft in until it
slides into the rear end bearing. Use care in the
9. Apply grease to the steel face of each thrust washer
installation of the camshaft to pre-vent damage to
(6 and 27) and place them so that the steel faces are
the cam lobes.
against the outer end of the camshaft and balance
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