Spark Plug; Spark Arrester; Valve Clearance - DeWalt DW168F Manual

2. Remove oil fill/dipstick and wipe clean.
3. Reinsert oil fill/dipstick fully into oil fill port
and tighten. Allow oil to collect on the
dipstick for a few seconds.
4. Remove oil fill/dipstick to read oil level. If
oil falls below top of pattern on dipstick,
add oil.
noTE: When filling the crankcase, allow
the oil to flow very slowly. If the oil is added too quickly, it will overflow and appear to be
full.
5. Replace dipstick and tighten securely.
To ChanGE oIl
noTE: Engine oil contains substances that are regulated and must be disposed of in
accordance with local, state, provincial and federal laws and regulations.
1. Disconnect spark plug wire.
2. Locate a suitable container under oil drain plug (Q9).
3. Remove the oil fill/dipstick (J9) from crankcase.
4. Remove the oil drain plug.
5. Allow ample time for all oil to drain out.
6. Install the oil drain plug and tighten securely.
7. fill with recommended oil. Refer to the Viscosity-
Ambient Temperature Chart for recommended oil.
noTE: Synthetic oil is NOT recommended.
VIsCosITy-aMBIEnT TEMpERaTuRE ChaRT
5w-30
˚F
-20 0 20
˚C -28.8 -17.7 -6.6
8. Replace dipstick and tighten securely.
9. Reconnect spark plug wire.
10. Dispose of oil according to local, state, provincial and federal laws and regulations.

Spark Plug

Use recommended spark plugs, see Spark Plug Cross Reference for correct spark plug.
To ensure proper engine operation, the spark plug must be properly gapped and free of
deposits.
waRnIng: If the engine has been running, the muffler and spark plug will be very hot.
To reduce the risk of injury, allow cooling before proceeding.
waRnIng: Always wear certified safety equipment: ANSI Z87.1 eye protection (CAN/CSA
Z94.3) with side shields.
PATTERNS
PATTERNS
Q9
30
10w-30
40 60 80 100
4.4 15.5 26.6 37.7
spaRk pluG CRoss REFEREnCE
BRanD paRT nuMBER
NGK bP6ES, bPR6ES
AUTOLITE 63
AC DELCO R41XL,R42XLS, R43fS,R43XL, R43XLS, R44XLS, R45XLS
CHAmPION RJ14YC
1. Remove the spark plug boot.
2. Clean any dirt from around the spark plug base.
3. Use a spark plug wrench (not supplied) to remove the spark plug.
4. Visually inspect the spark plug. Replace it if the insulator is cracked or chipped. Clean
the spark plug with a wire brush if it is going to be reused.
5. measure the plug gap with the feeler gauge. Correct as necessary by
carefully bending the side electrode. The gap should be: 0.70-0.80 mm
(0.028-0.031 in).
6. Make sure the spark plug washer is in good condition. Thread the spark
plug in by hand to prevent cross threading.
J9
7. After the spark plug is seated, tighten with a spark plug wrench to compress
the washer. If installing a new spark plug, tighten the spark plug 1/2 turn
after it seats to compress the washer. If reinstalling a used spark plug,
tighten 1/8–1/4 turn after the spark plug seats to compress the washer. Do
not overtighten.
noTE: The spark plug must be securely tightened. An improperly tightened spark plug
can become very hot and could damage the engine. Never use spark plugs which have an
improper heat range. Use only the recommended spark plugs or equivalent.

Spark Arrester

waRnIng: DO NOT operate engine without muffler cover or spark arrestor.
waRnIng: If the engine has been running, the muffler will be very hot. To reduce the
risk of injury, allow engine to cool before proceeding.
waRnIng: Always wear certified safety equipment: ANSI Z87.1 eye protection (CAN/CSA
Z94.3) with side shields when removing carbon deposits.
noTE: The spark arrester must be serviced every 100 hours to maintain its efficiency.
CC
R12
1. Remove the spark arrestor screws (R12) and remove the spark arrestor (CC).
2. Use brush to remove carbon deposits from the spark arrester screen. Inspect the spark
arrester screen for holes or tears. Replace the spark arrester if necessary.

Valve Clearance

waRnIng: Hot surfaces. Risk of burn. Engine and surrounding parts are very hot, do not
touch. Allow engine to cool prior to servicing.
noTE: Engine must be cold to check the valve clearance.
1. Remove the cylinder head cover.
15