Generac Power Systems MAC 950F Owner's Manual page 25

Problem
Engine Emits White Smoke
Engine Emits Black, Gray or
Blue Smoke
Engine Overheats
Owner's Manual for Flameless Air Heater
Cause
Engine compression too low
Defective thermostat(s) (does not close)
Coolant entering combustion chamber
(failed cylinder head gasket or cracked cyl-
inder head)
Electronic Control System problem or
basic engine problem
Improper type of fuel
Poor fuel quality
Low engine temperature
Defective thermostat
Defective fuel injectors
Air cleaner restricted or dirty
Improper type of fuel
Engine burning oil
Electronic control system problem or basic
engine problem
Exhaust filter is cracked or damaged
Fuel injectors dirty
Turbocharger not functioning properly
Air cleaner restricted or dirty
Lack of coolant in cooling system
Low engine oil level
Radiator core dirty
Cooling system needs flushing
Engine overloaded
Loose or defective fan belt
Defective or wrong type of thermostats
Defective radiator cap
Defective temperature gauge or sender
Incorrect grade of fuel
Damaged cylinder head gasket
Leak at cylinder head gasket
Defective coolant pump
Troubleshooting
Solution
Determine cause of low compres-
sion and repair as required or con-
tact an IASD
Test thermostats; replace thermo-
stats as required
Repair or replace as required, or
contact an IASD
Contact an IASD
Drain fuel and replace with proper
grade and quality of fuel for operat-
ing condition
Warm up engine to normal operat-
ing temperature
Remove and check thermostat
Contact an IASD
Replace air cleaner element as
required
Use proper fuel
Contact an IASD
Replace air cleaner element as
required
Fill cooling system to proper level.
Check radiator and hoses for loose
connections or leaks
Check oil level. Add oil as required
Clean cooling system as required
Flush coolant system
Reduce engine load
Check automatic belt tensioner
and belts. Replace as required
Test thermostat opening tempera-
ture, replace thermostats as
required
Replace radiator cap as required
Check coolant temperature with
thermometer and replace, if neces-
sary
Use correct grade of fuel
Contact an IASD
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