31 / 948
KRYOTEC ENGINE
22
4. ENGINE TESTS AND MAINTENANCE
A. PRELIMINARY INSPECTION
NOTE
It is always advisable to first use the diagnostic
tool and rectify the electrical faults, before
commencing
with
mechanical
repairs/
troubleshooting. Refer ENGINE MANAGEMENT
SYSTEM section in this group for procedure.
General
Check for leakage of Oil, fuel, and Coolant.
Check for overheating of engine.
Check for unusual smoke.
If there is any fault in the Engine Management
system
(EMS)
then the MIL indicator in the
instrument cluster will come ON. In such a
case connect the diagnostic tester.
(For
procedure refer EMS section).
Before proceeding to carry out actual
reconditioning of engine, it is desirable to have
a preliminary inspection of engine to ascertain
whether an engine reconditioning is necessary
and if so, to what extent.
Most common reasons for which engine is
reconditioned are
1. Loss of power.
2. Excessive engine oil consumption.
3. Extremely low engine oil
pressure.
4. Mechanical failures.
B. ENGINE TESTS
CYLINDER COMPRESSION TEST
1. Warm up engine to operating temperature
(approximately 80 °C, 176 °F).
2. Shut the engine off.
3. Check that fuse of the electric fuel pump has
been removed, before removing the injectors.
4. Remove the fuel injector.
5. Install the dummy injector
(5412 5890 0702)
complete with the injector claw into fuel injector
hole of cylinder to be tested.
6. Install the clamp and tighten the nut 25 N·m (18
ft. lbs.).
7. Connect the compression tester to the fitting
8. Test compression pressure by cranking engine
with starter for at least 8 revolutions.
Description
Specification
Difference
Between
Cylinders
Cylinder
Compression
21 – 25 bar
(304-362 psi)
5 bar (73 psi)
9. Carry out test procedure at the remaining
cylinders in the same way.
10. Check that there is not a great difference
between the pressure readings for the cylinders.
11. Remove the dummy injector complete with
fitting from cylinder head.
12. Install the fuel injector