NANO ePAS

ENGINE 273 MPFI

ENGINE

PRELIMINARY INSPECTIONOF ENGINE

Before proceeding to carry out actual overhauling of

engine it is desirable to have a preliminary inspection

of engine to ascertain whether an engine overhaul is

necessary and to what extent.

Most common reasons for which engine is overhauled

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 occurs due to one or more of

following reasons:

•

Defective Ignition system

•

Defective Fuel system

•

Clogged air cleaner/choked catalytic converter or

exhaust silencer

•

Clutch slippage

•

Brake binding

•

Loss of engine compression

a. Ignition System

Check ignition coil. If found faulty, replace it.

b. Fuel System

Check condition of fuel filter. If found blocked,

replace fuel filter.

c. Clogged air cleaner/choked catalytic

converter exhaust silencer

Check and If found choked, clean or replace.

d. Clutch Slippage

Clutch slipping can be confirmed by any of the

following two methods:

Drive the car in 1st or 2nd gear at maximum speed

corresponding to that gear. With accelerator pedal

fully pressed, apply brake gradually with left foot. If

the engine stalls, it means that clutch does not

slip.

Drive the car with weight equal to GVW in 3

gear

on level ground and let the speed drop down to

approximately 15 km/h or 10 mph. Now press

accelerator pedal fully. With slipping clutch, the

car speed will not pick up and also clutch burning

smell will be noticed. If this does not occur and car

picks up speed, it indicates that clutch does not

slip.

e. Brake Binding

During driving apply brake number of times and

then shift the gear to neutral position Check brake

drums for overheating and if necessary jack up the

car and check the wheels for free rotation.

f. Loss of Engine Compression Pressure

If loss of power is not on account of defective fuel

system, lack of air, choked exhaust silencer, clutch

slipping and brake binding. Check engine

compression.

(Refer on VehicleRepair Procedure to check engine

compression Procedure)

2. Excessive Engine Oil Consumption:

Maximum limit for Oil Consumption

= 100 cc/ 1000 km

= 100 cc/ 625 miles

High engine oil consumption may also lead to

overhauling of the engine but before proceeding to

overhauling, check following points :

1. Make sure that there is absolutely no external oil

leak (i.e. from the camshaft oil seal, crankshaft oil

seal, oil sump gasket, oil pump gasket, cylinder

head cover gasket etc.)

2. If no external leakage is found, determine the exact

engine oil consumption, as per following procedure.

Determining Exact Oil Consumption

CAUTION

Do not make a rough estimate of engine oil

consumption by noting the kilometers covered by

the car at any random stage and finding oil

consumed from the topped up position taking into

consideration dipstick level and oil sump capacity.

Procedure:

1. To confirm that engine oil consumption is higher,

place the car on a level ground.

2. Top up oil sump to its capacity of 2.2 liters.

3. Warm up the engine so that oil temperature is 75

°C to 80 °C.

4. Take a clean vessel, place it below the drain plug

of oil sump.

5. Drain the hot oil into the clean vessel. Drain it

fully.

6. Screw in oil sump drain plug and tighten it.

7. Weigh the vessel along with oil let this weight be

‘w1’, gms.