DeWalt DW168F - Compression

20

PROBLEM CAUSE SOLUTION
Debrisislockingupflywheel Disassemble and clear any
debris from recoil base
and recoil assembly. See
Flywheel Ignition under
Breakdown.
BATTERY STARTER/BATTERY FAILURE
PROBLEM CAUSE SOLUTION
Battery does not
supply electricity to
starter
Battery leads faulty Checkfordebrisblocking
connections
If worn, replace battery
Battery is dead Charge and replace battery
pack.
BATTERY STARTER/STARTER MOTOR FAILURE
PROBLEM CAUSE SOLUTION
Starter motor fails Pinion gear not engaged with
flywheel
Remove starter motor and
makesurethepiniongear
slides freely on helix
Solenoid faulty Makesuregearteethhave
not been stripped
Starter motor damaged Repair or replace starter
motor
Electrical relay fails Starter toggle switch faulty Checkforcontinuityonstarter
toggle switch in the ON posi-
tion.SeeFanCoverbreak-
down section.

STARTING PROBLEM
PROBLEM CAUSE SOLUTION
Poor compression Leaking/stuckvalves Valve job/replacement
Headgasketburned Replaceheadgasket
Worn piston rings Service/replace rings or piston
orcrankcase
Worn cylinder bore See Compression Test.
Warped/crackedcylinderhead Replace cylinder head
PERFORMANCE PROBLEM
PROBLEM CAUSE SOLUTION
Engine overheats Cooling fins obstructed Clear fins of debris
Excessive load Clean combustion chamber
Carbon in combustion
chamber
Clean combustion chamber
Low oil Add oil
Set at wrong idle speed See Speed/Governor
Adjustment under Perform
Test Checks.
Low power Cloggedsparkarrestor Remove, clean and replace.
Valvesleaking Perform valve job,
see Inspection under
Breakdowns: Cylinder Head
Valves.
Intakeexhaustmanifolds
clogged
Clean manifolds
Carbon build up Clean combustion chamber
Blackexhaust
smoke
Carbon in combustion
chamber
Clean combustion chamber
Valvesleaking/stuck Checkvalves/seats.
Recondition if necessary.
Checkvalvetovalveguide
fit up.
Blueexhaustsmoke Piston rings/cylinder bore
worn and passing oil
Replace rings and piston/
honecylinder/checkairfilter.
Can not handle load Improper valve clearance Check/adjustvalveclearance
or perform valve job, see
Inspection under Cylinder
Head Valves Breakdowns.
Weakvalvespring Perform valve job, see
Inspection under Cylinder
Head Valves Breakdown.
Valve/valve seats worn or
damaged
Perform valve job, see
Inspection under Cylinder
Head Valves Breakdown.