Johnson J10RLSUR, Service Manual

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88
IGNITION
TROUBLESHOOTING
TROUBLESHOOTING
Complete these tasks to obtain fast, accurate test
results when troubleshooting the capacitor dis-
charge ignition system.
•
Visual Inspection – Check wiring for broken,
pinched, or loose leads. Connectors must be
securely fastened and free from moisture or
water accumulation.
•
Test Equipment Condition – Make sure
testers are in working order. Many hours can be
wasted by replacing working components need-
lessly.
•
Follow Procedure – Troubleshooting can
seem difficult if you vary your technique for
each problem. Many times items in the system
are overlooked because you "thought" you
tested them. By following the same procedure
each time you troubleshoot, all items in the igni-
tion system will be tested.
•
Test the Complete System – There may be
occasions when more than one component is
defective. If this condition is undetected,
repeated ignition system failure may occur, or
damage to replacement parts could result. Test
everything.
Flywheel Indexing
This test is used to identify erratic ignition opera-
tion. Internal power pack problems could cause a
pack to fire erratically or continuously. To trouble-
shoot this situation, determine if each cylinder is
firing at the correct time and no more than once
per revolution.
Disconnect the spark plug leads and remove both
spark plugs.
Place the eraser end of a pencil in the number 1
spark plug hole. Slowly turn the flywheel by hand,
clockwise, until the greatest length of the pencil is
outside the spark plug hole. This indicates the
number 1 piston is near top dead center.
Make a reference mark on the flywheel rim,
directly across from the timing pointer or starter
pivot screw. Label this mark number 1.
Repeat procedure for number 2 cylinder. Label
this mark number 2.
Install the spark plugs and spark plug leads. Start
the engine in a test tank and run the engine at the
RPM where the problem exists.
Carefully hook an induction timing light to each
cylinder, alternately. The timing light should indi-
cate that cylinder's number only, and the number
should only appear near the timing pointer or
starter pivot screw.
If another cylinder's number appears, or the cor-
rect number appears more than once per revolu-
tion, check ignition coil primary lead routing or
replace power pack.
TYPICAL
1. Pencil
27360
TYPICAL
1. Mark
2. Timing pointer
45102
1
2
1