Briggs & Stratton 250000 Spécifications télécharger pdf (Page 280)

Principles of Operation, Spark Gap Type

This Oil Gard



system uses an oil level sensor with a

spark gap connected to a high tension lead from the

ignition armature (1). When oil is the correct level, the

spark gap (2) is filled with oil and a spark will not jump

the gap.

When oil level drops to the point where the spark gap is

exposed to air in the crankcase, the resistance of the

gap is lower than the spark plug (3) gap and spark will

fire across the Oil Gard



sensor instead of the spark

plug, stopping the engine. The engine cannot be

restarted until the oil level is returned to normal,

Fig. 15.

Fig. 15

TROUBLESHOOTING OIL GARD



SYSTEMS

Troubleshooting an Oil Gard



system need not be

complicated or time-consuming. A basic understand-

ing of how the Oil Gard switch and its components

function is all that is needed in order to locate the

problem or the cause of failure with this low-oil warning

system. If a problem occurs, review the principle of

operation, Figs. 16 and 17.

USE THE CHARTS AND ILLUSTRATIONS TO

ASSIST IN TROUBLESHOOTING PROBLEMS

WHICH COULD OCCUR WITH THE LOW-OIL

WARNING SYSTEM . . .OIL GARD



. The chart lists

the failures that are most likely to occur first, with

references given by letter designation on the

illustration.

Fig. 16

The table below lists possible problems with the probable cause and cure. Refer to Fig. 16.

PROBLEM LETTER CAUSE CURE

No Spark A Low Oil in Crankcase Refill With Oil

B Excessive Angle of Operation Reduce Angle of Operation

C Defective Oil Gard Sensor Replace Sensor

No Spark – Correct Amount of

Oil in Crankcase

D Stop Wire Grounded Repair or Replace Wire

E Defective Magnetron Armature Replace Armature

Spark Present – Low on Oil F Defective Ground Wire Repair or Replace Wire

C Defective Oil Gard Sensor Replace Sensor

Intermittent Spark D Stop Wire Grounded Repair or Replace Wire

C Defective Oil Gard Sensor Replace Sensor

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Briggs & Stratton 250000 Spécifications Page 280

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