Perkins 103-06 Workshop Manual page 76

14 Disconnect the battery. Then put the battery into safe
storage in a fully charged condition. Before the
battery is put into storage, protect its terminals
against corrosion. POWERPART Lay-Up 3 can
be used on the terminals.
15 Seal the vent pipe of the fuel tank or the fuel filler
cap with waterproof tape.
16 Remove the alternator drive belt and put it into
storage.
17 In order to prevent corrosion, spray the engine
with POWERPART Lay-Up 3. Do not spray the
area inside the alternator cooling fan.
18 If the transmission is not to be used for at least a
year, fill the Hurth gearbox completely with its
normal lubricating oil. This will have to be
drained and the
lubricating oil added when the engine is
returned to service.
Attention: After a period in storage, but before
the engine is started, operate the starter motor
with the stop button pressed or with the engine
stop control in the "stop" position until oil pres-
sure is indicated. Oil pressure is indicated when the
low pressure warning light is extinguished.
If the engine protection is done correctly
according to the above recommendations, no
corrosion damage will normally occur. Perkins
are not responsible for damage which may
occur when an engine is in storage after a period in
service.
Alternator A127 - 55 amp -
To remove and to fit
•
remove
1 Disconnect the electrical connection.
2 Loosen the pivot fasteners of the alternator and the
fasteners of the adjustment link.
3 Release all the belt tension and remove the belt.
4 Remove the adjustment link from the alternator
and remove the pivot bolt(s). Make a note of the
position of the washers and distance pieces to
ensure that they are fitted correctly. Remove the
alternator.
•
fit
1 Put the alternator in position and assemble
loosely the pivot fasteners and the adjustment
link and its fasteners. Ensure that the washers
and the distance pieces are fitted in their correct
positions and that the alternator pulley is aligned to
the crankshaft pulley within ±2.4mm (
2 Fit the drive belt and adjust the drive belt tension.
Tighten the fasteners and check the tension
again.
3 Connect the electrical connection.
•
maintain
1 Ensure that the drive belt is not worn and that
the belt tension is correct.
2 Keep the alternator clean. To clean the alternator,
use a material which is damp with
normal amount of new
/32in).
3
kerosene or a special fluid used for this purpose.
Ensure that the fluid does not enter the cover of
the alternator.
3 Ensure that air can pass easily over the casing to
to keep it cool.
Fault diagnosis
The alternator is so designed that a flow of
current indicated by no light at the warning light or a
reading shown on an ammeter is enough
indication that the system is in correct operation. If
the system is in correct operation, no open
circuit, voltage or current output checks need to
be done on the installation unless:
•
The warning light does not show when the alter-
nator is stationary and the switch is in the "on"
position or it shows a light when the alternator
is in operation.
•
No charge current is shown on the ammeter.
•
The battery is discharged.
•
The battery is hotter than normal which is an
indication of loss of voltage control.
If one or more of the above symptoms occur, the
procedure indicated
applied.
1 Ensure that the battery is in a fully charged
condition.
2 Connect a moving-coil voltmeter of good quality,
with a range of 0-50 volts, across the positive
and negative terminals of the alternator. If an
ammeter is not fitted in the electrical circuit, fit
a moving-coil ammeter of good quality, with a
range of 0-100 ampere, in the wire between the
alternator and the positive terminal of the
battery.
3 Turn the warning light switch to the "on" position (
main switch on instrument panel) when the
warning light should be illuminated.
4 Switch on a 10-15 ampere load, for example,
lights, fans, etc..
5 Start the engine and operate it at a fast idle speed
when either the warning light should be
extinguished or the ammeter indicates a small
change in the current in relationship to the
engine speed.
6 Increase the engine speed for a moment to near
maximum speed, when the charge current
should be approximately 55 amperes (A127) for a
12 volt system.
7 Operate the alternator at approximately half speed
(engine speed approximately 1800 rev/ min) and
remove the electrical load. The voltage should go
up to 14 volts for a 12 volt system or 28 volts for
a 24 volt system and then remain constant. At
the same time the current reading should show
a reduction.
If a fault is found, the alternator should be
removed for test by a specialist.
The regulator is a sealed unit and a repair is not
possible. If there is a regulator fault, the regulator
must be renewed.
below should be