2. V-Belt Tensiometer:
a. Position alternator to obtain an initial belt tension of 75 lbs.
b. Operate engine for a minimum of l5 minutes.
c. Recheck alternator belt tension. The meter should indicate 46 to 58 lbs. If tension does not fall
within this range, readjust alternator as necessary.
3. Deflection Method: Belt tension may be checked by measuring the amount of deflection caused by a
predetermined amount of tension:
a. Attach hook of a small spring scale to belt at approximate mid-point between ring gear support and
alternator.
b. Pull on scale until a reading of 14 pounds is obtained (10 lbs for used belts).
c. Measure distance belt has moved with 10 to l4 pound load applied. The distance (deflection)
should be 5/ l6 inch, if less than 5/ l6 inch, belt is too tight.
4. Upon completion of alternator belt tension adjustment, tighten alternator pivot bolts to a torque of 225
to 255 inch-pounds.
BATTERY
SERVICING BATTERY
—CAUTION—
Battery fluid must not be filled above baffle plates.
—CAUTION—
Serial numbers 8611005 and up have an uncapped center vent.
Verify angled face of center vent is facing aft to ensure positive
airflow through battery box.
Battery access is through aft side of baggage compartment. It is enclosed in a protective box with a vent
system and a drain. Vents allow fresh air to enter box and draw off fumes that may accumulate due to charging
process. The drain is clamped off and should be opened occasionally to drain any accumulation of liquid. It
should also be opened when cleaning the box. A hydrometer check should be performed to determine the
percent of charge in battery. All connections must be clean and tight.
REMOVAL OF BATTERY
l. Remove access panel to aft section of fuselage.
2. Remove battery box cover.
—CAUTION—
Always remove ground cable first and install last to prevent
accidental short circuiting or arcing.
3. Disconnect battery cables.
4. Lift battery from box.
24 - 34 - 00
Page - 24 - 37
Reissued: August 1, 1986
1J12
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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