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