5-72.
An estimate of the life of a Roots blower
rotor gear can be determined by which of
the following methods?
1.
A comparison of charts showing the
average use and wear with records of
the use of the particular machine
2.
4 careful study of records of the
amount of wear as recorded periodi-
cally
3.
A study of the manufacturer's esti-
mates of lifetime of the gear for
the engine
4.
A computation of the amount of use
the machine will receive and the
type of gear used
5-73.
When one of the blower rotor drive gears
indicates a slight tooth fracture, what
should you do?
5-74.
Failure of a properly aligned and
adequately lubricated chain drive mecha-
nism may be caused by which of the
following parts?
1.
Sheared cotter pins
2.
Binding joint pins
3.
Both 1 and 2 above
4.
Worn chain links
5-75.
After a long period of operation, how
is a chain drive usually adjusted?
1.
By peening the connecting link pins
2.
By tightening the chain tension
3.
By replacing the connecting pin
4.
By realigning the idler gears
1.
Replace the gear with one from
another set
2.
Replace the gears with a matched
set
3.
Align the gears to prevent further
damage
4.
Install additional shims to relieve
tooth contact
35