Regular spark plug inspection helps keep your John Deere 100 Series tractor running smoothly. Follow the steps below for safe and proper maintenance.
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Steps:
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Park the tractor safely
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Refer to the Parking Safely section of your operator’s manual.
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Allow the engine to cool
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Never work on a hot engine.
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Open the hood
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For V-twin engines, there will be one spark plug on each side.
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Disconnect spark plug wire(s) (A)
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Gently pull the boot off the spark plug.
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Remove the spark plug(s)
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Use a spark plug socket and wrench.
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Clean the spark plug
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Use a wire brush to carefully remove carbon deposits and dirt.
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Inspect the spark plug
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Look for:
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Cracked porcelain
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Pitted or worn electrodes
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Any other visible damage
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Replace the spark plug if defects are found.
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Check spark plug gap (B)
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Use a wire feeler gauge.
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Adjust the outer electrode if needed.
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Correct gap: 0.76 mm (0.030 in.)
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Reinstall the spark plug(s)
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Tighten to 20 N·m (15 lb-ft) torque.
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Reconnect spark plug wire(s)
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Push the boot back firmly onto the plug.
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Close the hood
More repair cases for John Deere, please refer to:John Deere Trouble Repair.