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ENGINE 273 MPFI
171
ENGINE
PROCEDURE FOR COOLANT DRAIN FOR
TATA NANO (BASE VERSION)
Requirements:
Regulated air supply at 1 bar (gauge)
pressure.
Please follow the below described procedure step-by-
step;
1. Position the vehicle on a horizontal level ground /
surface / car lift.
2. Allow the engine to cool down close to ambient
temperature.
3. Open the radiator pressure cap (Fig. A) & loosen
the radiator drain plug (Fig. B) to drain the coolant
in the suitable vessel/tray.
4. Disconnect the recovery bottle vent hose at the
radiator filler neck side (Fig. D) and drain the coolant
from recovery bottle in the suitable vessel/tray.
5. Re-connect the recovery bottle vent hose.
6. Apply 1 bar (gauge) pressure compressed air at
the radiator filler neck to drainmore coolant through
radiator drain plug.
7. Finally close the radiator drain plug completely.
PROCEDURE FOR COOLANT REFILLING & DE-
AERATION FOR TATANANO (BASE VERSION):
Please follow the below described procedure step-by-
step.
1. Ensure all the hose joints are properly clamped
and the radiator drain plug is completely closed,
but HVAC de-aeration port is open
2. Take specified quantity of fresh premixed coolant
(in the ratio 50:50 Antifreeze coolant and De-
mineralized water)
3. Open the radiator pressure cap.
4. In the engine OFF condition, fill the coolant slowly
through the radiator filler neck and continue the
coolant filling up to the radiator filler neck.
5. Fill the coolant in the recovery bottle up to the FIRST
FILL/ REFILL level and fit back the recovery bottle
cap.
6. Start the engine, and do ~3 times tip in of the
accelerator pedal to allow forced circulation of the
coolant. Replenish the coolant level in the radiator
filler neck. Repeat the above procedure few times,
until there is no further coolant level drop in the
radiator filler neck. (Caution: During tip – in do not
hold the engine at higher rpm, as hot coolant may
spill out of the open radiator filler neck.)
7. Now fix the radiator pressure cap and close it only
till first step (Note: Radiator filler neck has two steps
of locking for pressure cap)
Fig. A
Fig. B
Fig. D