DETROIT DIESEL 53
Trouble Shooting Engine 15.2
Chart 2 (Cont'd. )
HARD STARTING (Cont'd.)
7. To check for air leaks, flow obstruction, faulty fuel
1. Refer to Items 2 and 3 and perform the operations
pump or faulty installation, consult the No Fuel or
Insufficient Fuel chart.
2. Replace the starting motor switch.
8. Inspect for governor-to-injector linkage binding that
will prevent the governor from positioning the injector
3. Hand crank the engine at least one complete
racks into the full-fuel position. Remove any bind found
revolution. If the engine cannot be rotated a complete
and readjust the governor and injector controls if
revolution, internal damage is indicated and the engine
must be disassembled to ascertain the extent of
damage and the cause.
9. The cylinder head must be removed and overhauled
to correct this condition.
4. Use the proper viscosity lubricating oil grade as
recommended in the Lubricating Oil Specifications.
10. Remove the air box covers and inspect the
compression rings through the ports in the cylinder
5. Recharge the battery if a light load test indicates low
liners. Overhaul the cylinder assemblies if the rings are
or no voltage. Replace the battery if it is damaged or
badly worn or broken.
will not hold a charge.
11. To check for compression gasket leakage, remove
Connect the leads properly after replacing the terminals
the radiator filler cap and operate the engine. A steady
that are damaged or corroded.
flow of gases from the coolant filler indicates either a
cylinder head gasket is damaged or the cylinder head is
At low ambient temperatures, use of a starting aid will
cracked. Remove the cylinder head and replace the
facilitate keeping the battery fully charged by reducing
the cranking time.
12. Check the exhaust valve clearance and adjust to the
6. Tighten the starter connections. Inspect the starter
commutator and brushes for wear. Replace the brushes
if badly worn and overhaul the starting motor if the
13. Inspect the blower drive shaft and drive coupling.
commutator is damaged.
Replace damaged parts.
14. Operate the starting aid according to the instructions
under Cold Weather Starting Aids.
1970 General Motors Corp.
SEC. 15.2 Page 7