MQ Power WHISPERWATT DCA125SSIU4F Operation Manual page 67

Symptom
Low engine power output and low speed,
black exhaust smoke.
Engine overheats.
DCA125SSIU4F 60 HZ GENERATOR • OPERATION MANUAL — REV. #6 (05/12/22) — PAGE 67
TROUBLESHOOTING (ENGINE)
Troubleshooting (Engine) - continued
Possible Problem
Air fi lter blocked?
Incorrect valve clearances?
Malfunction at injector?
Too much oil in engine crankcase?
Entire cooling air system contaminated or
blocked?
Fan belt broken or elongated?
Coolant insuffi cient?
Radiator net or radiator fi n clogged with dust? Clean net or fi n carefully.
Fan, radiator, or radiator cap defective?
Thermostat defective?
Head gasket defective or water leakage?
Solution
Clean or replace air fi lter.
Adjust valves per engine specifi cation.
See engine manual.
Drain off engine oil down to upper mark on
dipstick.
Clean cooling air system and cooling fi n
areas.
Change belt or adjust belt tension.
Replenish coolant.
Replace defective part.
Check thermostat and replace if necessary.
Replace parts.