Farmall 90 Manual page 21

Problems
Engine overheating.
Engine lacks power and
runs unevenly.
SECTION 10 - - ENGINE - - CHAPTER 1
TROUBLESHOOTING (continued)
Possible Causes
1. Coolant pump malfunction.
2. Thermostat faulty.
3. Radiator inefficient.
4. Deposits in cylinder head and
crankcase coolant passages.
5. Coolant pump and fan drive belt
slack.
6. Coolant level low.
7. Incorrect engine timing.
8. Injection pump calibration incor-
rect -- delivering too much or too
little fuel.
9. Air filter clogged.
1. Injection pump timing incorrect.
2. Auto advance regulator in injec-
tion pump damaged.
3. Control valve journal worn.
4. Injection pump delivery irregular. Overhaul injection pump and adjust
5. All--speed governor damaged.
6. Injectors partially obstructed or
damaged.
7. Impurities or water in fuel lines.
Solutions
Overhaul pump and replace if neces-
sary.
Replace the thermostat.
Remove internal deposits by flushing.
Check for leaks and repair.
Flush out coolant system.
Check and adjust belt tension.
Top up expansion tank with specified
coolant mixture.
Check and adjust engine timing.
Calibrate pump on test bench to va-
lues specified in calibration tables.
Clean filter unit and replace filter el-
ement if necessary.
Adjust injection pump timing.
Overhaul injection pump and adjust
on test bench to values specified in
calibration table.
Overhaul injection pump and adjust
on test bench to values specified in
calibration table.
on test bench to values specified in
calibration table.
Overhaul injection pump and adjust
on test bench to values specified in
calibration table.
Clean and overhaul injectors and ad-
just pressure setting.
Disconnect fuel lines from injection
pump and clean thoroughly.
necessary clean and dry the fuel tank.
21
If