Installation Manual
UL
POWER
UL390i UL390i
S
390i
SA
MI 390A01 Revision No: 3
Date:
2014-09-15
Page:
63
of
69
Oil Temperature
The oil temperature is measured on the left side of the crankcase. (See picture)
A temperature sensor with 5/8"-18 UNF thread combined with a sealing ring can be screwed into the
front. This sensor will indicate the oil temperature in the cockpit. Sensors with M10; M10x1;
M12x1,5 or 1/8 NPT thread can also be used with an adaptor plug. These adaptor plugs are available
from ULPower if needed. (See accessories/parts)
Make sure nuts/sensors are properly sealed, making sure that the oil can’t leak of the engine!
Fuel Pressure
Recommended specifications for fuel pressure sensor:
range: 0-5 bar (0-80 psi)
thread: 1/8"NPT
CHT
Ideally all 4 CHTs should be measured. Alternately at least 2 CHTs (the hottest one on each side of
the engine; most probably CYL3 and CYL4 in a tractor configuration) should be monitored and kept
within limits.
CHT Bayonet style probes by ULPower are recommended. See accessories/kits. Bayonet adaptor
(3/8"UNF) is integrated. Each cylinder head has a pre-drilled hole close to the exhaust port to
monitor CHT.
Alternately 14mm gasket ring type CHT-probes can be used under sparkplugs, but cooling air flow
over the cylinder heads can give different readings when compared to CHT probes which are sunk
into the cylinder head material.
(4)
Interface for oil
temperature
sensor (cockpit)
