Visual Inspection Of The Spark Plug Condition - Kohler SFGLD480 Operation & Maintenance Manual

5. VISUAL INSPECTION OF THE SPARK PLUG CONDITION

ID
1
Small deposits of white ashes on the electrodes
2
Electrodes or casing fused
3 Orange-colour residues on spark plug end
4 Granular red deposits on insulator or spark plug end
5
White-yellowish deposits on the electrodes
6
Rough white deposits on spark plug end
7 Hard whitish deposits on the spark plug
8
Black specks on the spark plug end
In many occasions, the forming of those deposits on the spark plugs is associated with the contamination of a
given motor oil component. It is therefore recommended that oil analysis should be made in order to determine
the oil components out of tolerance.
ID Representative oil component
1 Normal oil
2 Aluminium
3 Water, glycol
4 Iron
When detecting any of the above mentioned conditions, eliminate the root cause before installing a new spark
plug.
PRODUCT INFORMATION
IO-G-M-33-001e
CONVENTIONAL SPARK PLUG CHANGING AND
MAINTENANCE INSTRUCTIONS
CONDITION
INDEX
C
POSSIBLE CAUSE
PREMATURE DETONATION OR IGNITION
(Possible faulty carburetion, ignition timing or poor quality of
ANTIFREEZE RESIDUES
(Possible entry of cooling water into the chamber)
IRON OXIDE DEPOSITS
SILICON DIOXIDE DEPOSITS
(Possible content of silicon in the fuel gas or intake air)
DEPOSITS OF CALCIUM OR BARIUM
(These elements normally proceed from oil, but calcium also
DEPOSITS OF BURNT OIL
(Possible wear or scratching of cyl. liner and/or piston rings.
Generally associated with high blow-by)
CINDER DEPOSITS
(Probably due to incomplete combustion or problems with oil
ID Representative oil component
5 Silicon
6 Water
7 Total solids, iron
8 Total solids, iron
5.2.25
DATE
June 2013
O&M_2.002211.810_A_10_2016
NORMAL
the gas used)
exists in water)
in the chamber)
Dep.2
3/3