Wacker Neuson WM 130, Repair Manual

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Troubleshooting WM 130/170/270 Repair
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106
P
oor out
put
1. Insufficient compres-
sion 1) Loose spark plug Retighten, replace
gasket
2) Leakage from cylinder head
gasket Retighten; replace
gasket
3) Piston ring seizure or wear Replace
4) Piston or cylinder wear Repair or replace
5) Incorrect valve and seat con-
tact Repair or replace
6) Valve stem seizure Repair or replace
7) Improper valve clearance Adjust
2. Ignition system prob-
lems 1) Faulty spark plug Replace
2) Faulty ignition coil Replace
3) Improper air gap between igni-
tion coil and flywheel Adjust
4) Demagnetization (flywheel
magneto) Replace
3. Fuel system malfunc-
tion 1) Carburetor clogged Overhaul
2) Fuel strainer and/or hose
clogged Clean or replace
3) Air in fuel lines Check and retighten
joints
4) Poor quality gasoline or water
in gasoline Replace with fresh
gasoline
4. Low air intake volume 1) Air cleaner clogged Clean or replace
2) Throttle valve malfunction Repair or replace
Overheating
1. Engine 1) Cooling air flow obstructed at
inlet or cylinder baffle portion Clean
2) Poor quality engine oil Change oil
3) Lean fuel/air mixture Check and adjust
carburetor
4) Excessive back pressure
exhaust system Check and clean or
replace
5) Overloading Adjust to rated load
Problem and possible cause Remedy