Piper Navajo PA-31 Service Manual page 511

inch away from a good ground, a series of hot sparks should occur.
WARNING
Grasp the spark plug lead far enough away from the
connection so as not to produce any dangerous elec-
trical shock.
g. If the spark does not jump the gap, check the applied voltage to the starting
vibrator. This voltage should be 28-volts.
h. If voltage is correct,
check the contact points of the magneto. Both sets of
contact points shall be opened.
i. Reject all units not complying with the preceding requirements or which
show any visual defects.
8-68. REMOVAL OF STARTING VIBRATOR.
a. Remove the left access panel to the nose section interior at station 70.0.
b. The starter vibrator is attached to the extreme left front side of the for-
ward fuselage bulkhead at station 81.0.
c. Disconnect the electrical lead from the vibrator.
d. Remove the vibrator from the bulkhead by removingthe attachment screws.
8-69. INSTALLATION OF STARTING VIBRATOR.
a. Position the vibrator on the bulkhead and secure with screws.
b. Connect the electrical leads to the vibrator.
c. Check operation per paragraph 8-67.
d. Install access panel.
8-70.
LUBRICATION SYSTEM.
8-71. ADJUSTMENT OF OILPRESSURE RELIEF VALVE. Engines are furnished
with an adjustable oil pressure relief valve, which enables the operator to main-
tain engine oil pressure
within the specified limits (60 to 90 psi).
The valve is
located above and to the rear of No. 5 cylinder.
If the pressure under normal
operating conditions should consistently exceed 90 psi or run less than 60 psi,
adjust the valve as follows:
a. With the engine thoroughly warmed up and running at a maximum of 2200
RPM, observe the reading on the oil pressure gauge. If the pressure
is above
Reissued: 10/12/79
POWER PLANT
2J13
PIPER NAVAJO SERVICE MANUAL