John Deere 318 - Manual (Page 331)

M78974 -UN-16MAY95
Remove blower housing to access gearcase
cover timing marks (A) and flywheel timing mark
(B).
Connect one lead of an ohmmeter or continuity
tester to the primary windings negative (—)
terminal of the ignition coil.
Connect the other tester lead to engine ground
or negative (—) terminal of battery.
Slowly turn flywheel clockwise until meter or
tester shows no continuity.
Turn flywheel 360 degrees until meter or tester
again shows no continuity. At this point the
ignition points just open, which is when ignition
occurs.
Check which of the gear case timing marks (A)
is directly across from flywheel timing mark (B).
See chart for timing specification of particular
engine used.
If timing is early (advanced), the igniton point
gap is too wide. If the timing is late (retarded),
the point gap is too narrow. Adjust ignition points
as necessary, GO TO
3c
.
NOTE: The ignition point gap of: 0.41 mm (0.016
in.) equals 16˚ BTC 0.51 mm (0.020 in.) equals
20˚ BTC
The “Spec” letter is the last letter of the engine
model number.
TIMING SPECIFICATION
Engine Model Timing In Degrees
B43E and B43G . . . . . . . . . . . . . . . . . . . . 16˚ BTC
B48G
Spec A and B . . . . . . . . . . . . . . . . . . . . . 20˚ BTC
Spec C . . . . . . . . . . . . . . . . . . . . . . . . . . 16˚ BTC
MX,15902402551A-19-16MAY95
Electrical System Diagnosis/Ignition Circuit Tests
TM1590 (17MAY95)
240-20-19
316, 318 & 420 Lawn and Garden Tractors
020895
240
20
19