February 11, 1963
Bulletin No. SB-942
Ignition
SUBJECT: PART #309927 WASHER - DISTRIBUTOR
A new steel washer has been added to the distributor of Model V4A engines. This washer,
part #309927, is inserted between the distributor drive pulley (580309) and lockwasher
(306994).
The purpose of 309927 washer is to prevent the lock-
washer teeth from working into the aluminum drive
pulley and in turn, prevent the distributor shaft nut
from loosening. A loose distributor shaft nut allows
the drive pulley to lash back and forth on the dis-
tributor shaft with engine acceleration and
deceleration - wearing the drive pulley keyway. The
result of this situation is a lag in ignition timing.
Part 309927 washer may be installed on previous
model V4A engines 1961 and up. Its installation will
insure the security of the distributor shaft nut and
be helpful in overcoming complaints of poor per-
formance and/or excessive fuel consumption, hard
starting and poor idling, since each of these con-
ditions can result from a lag in ignition timing.
To add 309927 to earlier model V4A engines, merely:
(1) Remove distributor cap, rotor and breaker
plate.
(2) Remove distributor nut (307915) and lock-
washer (306994).
(3) Remove pulley (580309) and examine keyway -
if keyway is worn replace pulley.
(4) Install pulley, 309927 steel washer,
lockwasher and nut (in this order).
(5) Torque distributor shaft nut 19 and 21 foot
pounds.
(6) Install breaker plate.
(7) Install rotor - checking engagement of
detent ball with small indent in rotor. If
detent does not engage rotor properly - file
or grind approximately .010" off bottom of
rotor.
(8) Complete the assembly and retime distributor
to flywheel as described in SB-827.
Part 309927 washer is presently available from your Parts Distributor at the list price
shown in the current Johnson Master Price List. Order only from your Parts Distributor -
the standard parts discount applies.