Kohler SFGLD480 Operation & Maintenance Manual page 308

SYMPTOM
Output power decreases or
cannot reach preset value
Engine does not accept
sudden changes in power
(1)
Engines with electronic carburetion
(2)
Engines with NOx sensor or lambda sensor carburetion
PRODUCT INFORMATION
IO-G-T-00-001e
GAS ENGINES TROUBLESHOOTING
PROBABLE CAUSE
Fuel system fails
1. Low gas pressure
2. Misadjusted pressure regulator
3. Clogged gas filter
Clogged air filter
Dirty air cooler
Leaks in intake or exhaust system
Turbocharger malfunction
1. Low oil pressure
2. Dirty blades
3. Excessive backpressure
4. Turbo seized up
5. Damaged blades
Ignition failure
Insufficient compression
1. Piston rings broken or worn
2. Scratched liners
3. Overhead valves do not close
4. Defective cylinder head gasket
Problem with throttle
1. Speed PID misadjusted
2. Low voltage
3. Problem in program
Carburetion problem
1. Carburetion dailure
(1)
2. Failure in MAP sensor
(1)
3. Failure in MAT sensor
4. Failure in NOx sensor or lambda sensor
Too lean air-fuel mixture
With hydraulic controller, speed PID
misadjusted
With electronic controller, speed PID
misadjusted
Ignition system failure
INDEX
B
REMEDY
1. Check supply line or contact supplier
2. Readjust or change spring
3. Clean or change filter
Replace filters
Clean air cooler
Check and repair leaks
1. Check pipes
2. Clean or replace turbocharger
3. Check exhaust
4. Change turbocharger
5. Change turbocharger
Check spark plugs, high-voltage wire and
coils
1. Change piston rings
2. Change liners
3. Rework cylinder head or change
4. Change cylinder head gasket
Check throttle with engine stop
1. Adjust speed PID
2. Check batteries or chargers
3. Check program
1. Readjust carburettor
2. Change sensor/check wiring. Check gas
leaks in conections
3. Change sensor/check wiring.
(2)
4. Change sensor/check wiring
Readjust carburettor mixture valve.
Adjust PID potentiometers correctly on
controller board.
Adjust speed PID. You need to have
advanced knowledge of programme
Check wires, coils, spark plugs and
connectors
6.1.5
DATE
Dep. 2
February 2016
O&M_2.002211.810_A_10_2016
5/10