Check Of Ignition Coils And Spark Plug Wires; Coils - Kohler SFGLD480 Operation & Maintenance Manual

PRODUCT INFORMATION INDEX DATE
Dep. 2
IO-G-M-33-003e B
May 2016

CHECK OF IGNITION COILS AND SPARK PLUG WIRES

O&M_2.002211.810_A_10_2016
1. INTRODUCTION
This Product Information Sheet aims to establish a procedure for checking Kohler gas engine ignition
components, namely the ignition coils and spark plug wires.
The coils and spark plug wires are the following::

Coils:

Spark plug wires:
A quick coupling system is very easy to fit, but is subject to oxidation/sulfation in the contact area between coil
and high-voltage wire.
A screwed coupling system is not so easy to fit as a quick coupling, but it ensures improved ignition due to a
stronger electrical connection.
2. COILS
The ignition coil is an electric transformer that transforms a low voltage into a high voltage impulse. The coil is a
component of the engine that barely needs any maintenance. In case of failure, it is necessary to change the
coil for a new one, since it is beyond repair.
Checking consists in measuring the resistance of the primary and secondary windings with a multitester before
fitting the coils into the engine. For references and , resistance must be in the range of
0.3 to 0.9  for the primary and between 4 and 8 k for the secondary winding. With reference
,
the value of the primary winding must be in the range of 0.45-0.65 and the secondary winding must lie
between 9 and 11 kThe photos show how to measure resistance properly, indicating its value as an example.
We do not recommend making this test on coils already fitted in the engine.
When checking the coils, sulphated compounds may develop and must be removed.
Fig. 1 - Measuring the resistance of the primary winding of an ignition coil ref. 76.64.302
5.2.33
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