How Checking John Deere Tractor 100 Series Spark Plug

 Park machine safely. (See Parking Safely in the SAFETY section.)

1. Let engine cool.
2. Lift hood.

Picture Note: Twin cylinder engine shown.

4 Disconnect spark plug wire(s) (A), one on each side on V-twin engines.

5 Remove spark plug(s).

6 Clean spark plug carefully with a wire brush.

7 Inspect spark plug for:

a Cracked porcelain.

b Pitted or damaged electrodes.

c Other wear or damage.

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8 Replace spark plug as necessary.

 

9 Check plug gap (B) with a wire feeler gauge. To change gap, move the

outer electrode.

Gap must be 0.76 mm (0.030 in.)

outer electrode.

Gap must be 0.76 mm (0.030 in.).

10 Install and tighten spark plugs to 20 N•m (15 lb-ft).

11 Connect spark plug wire(s) and lower hood.

03.2024 John Deere Service Advisor 5.3.235 AG/CF Diagnostic Software