John-deere stx38 User Manual download pdf (Page 151)

3/21/97

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ELECTRICAL

TESTS AND ADJUSTMENTS

IGNITION SPARK TEST

Reason:

To determine condition of ignition system.

Equipment:

• D-05351ST Spark Tester

Connections:

1. Remove ignition module high tension lead (B) from

spark plug (A).

2. Connect spark tester lead (D) to spark plug (A).

3. Connect high tension lead (B) to tester (C).

IMPORTANT: DO NOT adjust spark tester gap (D)

beyond 5.0 mm (0.200 in.) as damage to ignition

system could occur.

4. Adjust spark tester gag (D) to

4.2 mm (0.166 in.)

with screw (C).

Procedure:

1. Crank or start engine. Watch spark at tester gap.

Results:

• Steady, strong, blue spark - ignition is good. If

engine will not start, check fuel supply and engine

compression.

• If spark is weak, or no spark, install a new spark

plug.

• If spark is still weak or still no spark, see Adjust

Ignition Module Air Gap and/or Ignition Module

Test..

Specification:

Spark Plug Gap . . . . . . . . . . . . . . 1.0 mm (0.040 in.)

Spark Plug Torque . . . . 38—43.4 N•m (28—32 lb-ft.)

IGNITION MODULE AIR GAP

ADJUSTMENT

Reason:

To adjust the air gap between the ignition module and

the flywheel to a specific dimension needed for proper

ignition timing.

Equipment:

• 0.25 mm (0.010 in.) feeler gauge

Connections:

1. Put transaxle in neutral.

2. Put key switch in OFF position.

3. Remove blower housing.

Procedure:

1. Turn flywheel magnet away from ignition module.

2. Loosen ignition module mounting screws and hold

module as far back as possible.

3. Turn flywheel magnet so it is centered on ignition

module.

4. Insert

0.25 mm (0.01 in.)

feeler gauge (A) between

flywheel magnet and all three ignition module

polls. Allow module to draw against feeler gauge

(A) and flywheel magnet.

5. Hold module coil in this position and tighten

mounting screws to specification.

6. Turn flywheel to remove feeler gauge.

7. Install blower housing.

Specifications:

Ignition module air gap

. . . . . . . . . . . . . . . . . . . . . . . . . . 0.25 mm (0.01 in.)

Ignition Module Cap Screws

. . . . . . . . . . . . . . . . . . . . 4.0—6.2 N•m (35—55 lb-in.)

M55937

M58360

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John-deere stx38 User Manual Page 151

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