Each used push rod and tappet must be
installed in its original location. New tap-
pets must be installed if a new camshaft is
to be installed.
11-11. Servicing the Camshaft.
The camshaft has an integral gear that drives the distrib-
utor; check the gear for damage. Inspect the camshaft itself
for damage, especially pits and flat spots. Measure the diam-
eters of the journals; if they are out of specification (table
1l-l), replace the camshaft.
11-12. Repair of Damaged or Worn Threads.
a. Damaged or worn threads can be repaired by using
Figure 11-28. Proper Rocker Arm Location on Shaft.
Heli-Coils or equivalent. This repair consists of drilling out
worn or damaged threads, tapping the hole with a Heli-Coil
11-10. Inspecting the Push Rods and Tappets.
tap, and installing a Heli-Coil insert into the tapped hole.
a. Push Rods. Check for worn or bent push rods; replace
This brings the hole back to its original thread size.
b. Table 11-4
lists the threaded hole sizes
in the engine
b. Tappets. Unless new tappets (lifters) are being installed,
block. It also gives the necessary tools and inserts for re-
check each tappet face for crown, using a straightedge. If you
pairing damaged or worn threads.
observe any negative crown (or dish), replace the tappet.
Figure 11-29. Heli-Coil or Equivalent Installation.
Table 11-4. HeIi-Coil Chart
**In cast iron or steel
441-399 0 - 84 - 10