Chevrolet 70 1969 Series, Shop Manual

Page: 305 / 913

6V-53 DIESEL ENGINE 6C-12
HARD STARTING— Cont.
FUEL-Cont.
INJECTOR RACKS NOT IN FULL FUEL POSITION-Check control tube for binds and reset
governor and control rack, if necessary.
FUEL TANK OR FUEL FILTER EMPTY—Fill fuel tank or prime filter.
IMPROPER GRADE AND TYPE FUEL-Refer to Current Diesel Service Bulletin.
DILUTED FUEL—Check storage and handling methods.
IMPROPERLY FILTERED OR RESTRICTED FUEL FLOW-Refer to “No Fuel or Insufficient
Fuel” chart.
AIR IN FUEL SYSTEM—Bleed air from fuel system at secondary fuel filter.
A B N O R M A L ENG INE O PERATION
UNEVEN RU N N IN G OR FREQUENT STALLING
CYLINDERS CUTTING OUT-Check for the following:
1. Valve Clearance Set Incorrectly—Readjust valve clearance as directed under “Valve Lash”
in “Engine Tune-up” section.
2. Insufficient Fuel—Refer to “No Fuel or Insufficient Fuel” chart.
3. Faulty Injector—Refer to “Injector Tests” under “Fuel Injectors” in “Fuel System”
(SECTION 6M).
COOLING SYSTEM TEMPERATURE BELOW NORMAL-Refer to “Abnormal Engine Coolant
Temperatures” chart.
NO FUEL OR INSUFFICIENT FUEL-Refer to “No Fuel or Insufficient Fuel” chart.
FAULTY INJECTORS—
1. Improper Timing of Injectors—Retime injectors as directed under “Injector Timing”
in (Section 6M),
2. Incorrect Rack Setting—Readjust injector racks as outlined in (Section GM),
8. Injector Spray Tip Leaks—Replace fuel injector.
CYLINDER PRESSURES LOW-Refer to “Hard Starting” chart.
GOVERNOR INSTABILITY (HUNTING)-Check for the following:
1. Governor Instability—Perform engine tune-up.
2. Binding In j ector Rack—Replace in j ector.
3. Faulty Ad j ustments—Perform tune-up operations in sequence as instructed in “Engine
Tune-up” section.
IMPROPER GRADE AND TYPE FUEL-Refer to Current Diesel Service Bulletin.
DILUTED FUEL—Check storage and handling methods.
IMPROPERLY FILTERED OR RESTRICTED FUEL FLOW-Refer to “No Fuel or Insufficient
Fuel” chart.
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK S H O P M A N U A L