Onan MDKBH Series, Service Manual

Page: 67 / 90

9-6
ENGINE OIL PRESSURE SENDER (E1)
WARNING
Accidental or remote starting can
cause severe personal injury or death. Before
removing a panel or access door, disconnect
the negative (–) cable at the battery to prevent
the engine from starting.
The oil pressure sender is threaded into the side of
the block (Figure 9-4). Use thread sealant and en-
gage at least two full threads when installing. In iso-
lated-ground applications the sender has two termi-
nals.
Check electrical resistance through the sender . Re-
place the sender if resistance is not between
227 and 257 ohms (0 psi) when the engine is
stopped.
ENGINE COOLANT TEMPERATURE
SENDER (E2)
The engine coolant temperature sender is threaded
into the thermostat housing (Figure 9-4). Use
thread sealant and engage at least two full threads
when installing. In isolated-ground applications the
sender has two terminals.
Replace the sender if resistance is not approximate-
ly 800 ohms at room temperature or does not de-
crease rapidly when immersed in boiling water.
BATTERY CHARGING REGULATOR (A1)
Mounting: The regulator and heat sink are
mounted on the air intake duct (Figure 9-1). The
regulator is easier to remove if the AC outlet box is
tilted out (secured by 4 screws inside the box).
Testing: See Page 8-5 to test battery charge wind-
ing B1–B2. To test the regulator, remove the lead
from terminal B+. If B1–B2 output is 15 to 20 VAC,
but regulator output is less than 12.8 VDC, replace
regulator AVR1.
COOLANT
TEMPERATURE
SENDER E2
OIL
PRESSURE
SENDER
E1
FIGURE 9-4. ENGINE SENDERS
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