Service manual

ENGINE ADJUSTMENTS
TESTING OIL PRESSURE
To test oil pressure, remove the hex head plug from the oil
gallery and install a mechanical oil pressure gauge in its
place. After warming up the engine, read the oil pressure
gauge.
OIL PRESSURE BETWEEN 35 AND 55 PSI
NOTE: A newly started, cold engine may have an oil pressure
reading up to 70 or 80 psi. A warmed engine can have an oil
pressure reading as low as 30 psi. Oil pressure will vary
depending
upon the load placed on the engine.
OIL PRESSURE GAUGE
WITH ADAPTER
MEASURING
OIL PRESSURE
THIS MECHANICAL TEST GAUGE CAN BE
INSTALLED WHERE THE OIL HOSE ENTERS ·
THE ENGINE BLOCK OR IN PLACE OF THE
OIL PRESSURE SENDER.
A CAUTION: Be sure to stop the engine before
checking the engine. Keep your hands away from
rotating parts such as the cooling fan, v-belt, p_ulleys,
and flywheel. Keep long hair away from rotating parts
and do not wear music earphones.
LOW OIL PRESSURE
A gradual loss of oil pressure usually indicates a worn bear-
ings. A rapid loss
of oil pressure indicates a specific bearing
. failure. For additional information on low
oil pressure read-
, ings, see the ENGINE TROUBLESHOOTING chart. .
33
OIL PRESSURE RELIEF VALVE
The oil pressure relief valve is located in the front gear case
cover just below the
oil pressure senders location. It is held
in place by a 22mrn hexhead plug. This valve's cracking
pressure is approximately 45 psi and operates to maintain the
pressure in the engine's lubricating system.
OIL PRESSURE SWITCH
There is an oil pressure switch connected into the engine's
oil gallery to monitor the engine oil pressure and to sound
the panel alarm buzzer should a low oil pressure issue
occur
(10-5 psi). The engine alarm buzzer is such cases
will sound continuously.
When performing an engine overhaul, replace the oil
pres-
sure switch and the oil pressure sender.
When installing the new parts apply a teflon sealant to the
threaded ends being careful not to close off the oil hole in the
sender.
Oil Pressure Sender and Switch Torque 9 -13 ft·lb (1.2 -1.8 m-kg)
A CAUTION: Oil Pressure Switch ·Do not use lock pli-
etS, vise grips or pipe wrenches on the oil pressure
switch. Use the correct socket which is available from
Snap-On, Proto, New Britain and othetS. Damage to the
switch will cause oil leaks and/or switch failure.
+
OIL
PRESSURE
SENDER
Check all connections/finings
tor tightness.
OIL PRESSURE SWITCH
SCHEMATIC