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Service Engine - 37
SERVICE ENGINE
MX10526
Picture Note: Model 17.542 used for photo
purposes.
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:
• Cracked porcelain.
• Pitted or damaged electrodes.
• Other wear or damage.
NOTE: In Canada, replace spark plug with resistor plug
only.
8. Replace spark plug as necessary.
M85200
9. Check plug gap (B) with a wire feeler gauge. To change
gap, move the outer electrode.
• Gap must be 1 mm (0.040 in.).
10.Install and tighten spark plugs to 20 N•m (15 lb-ft).
11.Connect spark plug wires and lower hood.
Adjusting Carburetor
NOTE: Carburetor is calibrated by the engine
manufacturer and is not adjustable.
If engine is operated at altitudes above 1829 m (6,000
ft), some carburetors may require a special high
altitude main jet. See your John Deere dealer.
If engine is hard to start or runs rough, check the
troubleshooting section of this manual.
Possible engine surging will occur at high throttle with
transmission in “N” neutral and mower engagement lever
disengaged. This is a normal condition due to the emission
control system.
After performing the checks in the troubleshooting section
and your engine is still not performing correctly, contact
your John Deere dealer.
Replacing Fuel Filter
NOTE: Change filter when fuel is low.
1. Park machine safely. (See Parking Safely in the
SAFETY section.)
2. Let engine cool.
3. Lift hood.
4. Put a drain pan under fuel filter.
A
B
c CAUTION: Avoid injury! Fuel vapors are
explosive and flammable:
• Do not smoke while handling fuel.
• Keep fuel away from flames or sparks.
• Shut off engine before servicing.
• Cool engine before servicing.
• Work in a well-ventilated area.
• Clean up spilled fuel immediately.
c CAUTION: Avoid injury! Touching hot surfaces
can burn skin. The engine and components will
be hot if the engine has been running. Allow
the engine to cool before servicing.