Kohler K91 Service Manual page 79

Figure Chalky White Deposits.
8-1 4.
Chalky White Deposits:
cate overheating . This condition is usually accom­
panied by excessive gap erosion . A clogged grass
screen . clogged cooling fins and excessively lean
carburetion are some causes of overheating .
Alternator O peration
There are five different models of alternators used
in the K series of engines . They are rated at 1 . 25 .
3 , 1 0 . 1 5 and 30 amperes . The 1 . 2 5 amp system
is intended for battery charging only. The 3 amp
Chalky white deposits indi­
device is intended for battery charging and light­
ing .
Refer to the wiring diagrams and troubleshooting
g uides in this subsection to test and service these
systems. There are no adjustments in these sys­
tem s . Replace if faulty.
NOT E : To prevent damage to the electrical system
and components:
a . Make sure the battery polarity i s correct . A
negative (-) ground system is used with K se­
ries engines.
b. Disconnect the rectifier-regulator leads and/or
wiring harness plug if electric (arc) welding is
to be done on the equipment powered by the
engine. Disconnect any other electrical acces­
sories that share a common ground with the
engine .
c . Make sure the stator (AC) leads d o not touch.
Shorting them together could permanently
damage the stator.
d . Do not operate the engine with the battery dis­
connected .
NOTE : If a battery has discharged to less than 4
volts , there may not be sufficient power to acti­
vate the rectifier-regulator. If the battery fails to
accept a charge from the alternator, charge it on
a battery charger and reinstall.
8 . 9