Service Engine - 29
SERVICE ENGINE
• Rinse precleaner thoroughly. Squeeze out excess
water in a dry cloth until precleaner is completely dry.
• Put approximately 30 ml. (1 oz.) of clean engine oil
onto the precleaner. Squeeze precleaner to distribute
the oil evenly. Squeeze out excess oil with a clean cloth.
9. Inspect cartridge for damage or excessive dirt. Replace
if necessary.
10. Clean air cleaner housing carefully. Prevent any dirt
from falling into carburetor.
11.Install foam precleaner mesh side up.
12.Install cartridge. Make sure cartridge and seal are
properly seated and sealing the carburetor air intake area.
13.Install air cleaner cover and tighten knobs. DO NOT
overtighten.
Checking Spark Plugs
1. Park machine safely, (See Parking Safely in the Safety
Section), and lift hood.
2. Disconnect spark plug wire(s) (A).
3. Remove spark plugs.
4. Clean spark plugs carefully with a wire brush.
5. Inspect spark plugs for:
• Cracked porcelain.
• Pitted or damaged electrodes.
• Other wear or damage.
NOTE: In Canada, replace spark plug with resistor plug
only.
6. Replace spark plug(s) as necessary.
7. Check plug gap with a wire feeler gauge. To change
gap, move the outer electrode.
• Model S1642: Gap must be 1 mm (0.040 in).
• Models S1742 and S2046: Gap must be 0.76 mm
(0.030 in).
8. Install and tighten spark plugs to 20 N•m (15 lb-ft).
9. 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.
IMPORTANT: Avoid damage! Dirt and debris can
enter the engine through a damaged filter element:
• DO NOT wash paper element.
• DO NOT attempt to clean paper element by
tapping against another object.
• DO NOT use pressurized air to clean element.
• Replace element ONLY if it is very dirty, damaged
or the seal is cracked.
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.
A
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