Revotron 1.2T
43
2.4 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.
To know exact reason and general
condition of engine, proceed as follows
1. LOSS OF POWER :
Loss of engine power may be due to
a. EMS is in limp-home mode due to some
critical fault.
b. Clogged air filter / clogged intercooler fins
/loss of charge air pressure / choked
exhaust passage / catalytic converter.
c. Defective fuel system
d. Clutch slippage
e. Brake binding
f. Turbocharger
A. EMS is in limp-home mode :
If the EMS detects some major fault in
the system it switches to limp-home mode,
where it runs at a reduced torque. Connect
the diagnostic tester and check if any faults
are present in the Engine EMS, if found
rectify them.
(For details refer Engine
Management Section)
B. Clogged Air filter / Loss of Charge Air
Pressure/ Choked Exhaust Silencer /
catalytic converter :
Loss of power with unusual black smoke
from engine exhaust indicates lack of air or
low air charging pressure to engine cylinders.
Clean air filter & inter cooler fins. Check all
joints for air leakage. If power loss with black
smoke is still felt, check exhaust silencer for
choking. Clean and replace silencer if
necessary. Check for kink formation in
exhaust piping.
C. Defective Fuel System :
•
Check the Fuel system for fuel flow. If the
flow is restricted change the filter.
D. Clutch Slippage :
Clutch slipping can be confirmed by any of
the following two methods:
Method 1 :
•
Drive the car in 1st or 2nd gear at a
minimum speed corresponding to that
gear.
•
With the accelerator pedal in a fully
pressed position, gradually apply brake
with left foot.
•
If the engine stalls, the clutch does not
slip.
Method 2 :
•
Drive the gear with weight equal to GVW
in 3rd gear on a level ground.
•
Allow the speed to drop upto 15kmph.
•
Now press the accelerator pedal fully.
•
With slipping clutch the car will not pick
up speed, also a clutch burning smell
could be noticed.
•
If this does not occur, the clutch does not
slip.
