ARIA

ENGINE

so on lower side and equal, it may be due to

blown cylinder head gasket.

D. Fuel System

Check the Fuel system for fuel flow. If the flow is re-

stricted change the filter. Check for any kink or

blockage in the fuel lines. Check “Water in fuel indi-

cator” in the instrument cluster, if illuminated drain

the water from the sedimentor.

E. Clutch Slippage

•

Clutch slipping can be confirmed by any of the

following two methods:

•

Drive the vehicle with normal load in 3rd gear on

level ground and let the speed drop down to ap-

proximately 15 kmph. Now press accelerator

pedal fully. With slipping clutch abnormal engine

speed increase will be seen and vehicle speed

will not pick up. Also clutch burning smell will be

noticed. If this does not occur and vehicle picks

up speed normally, it indicates that clutch does

not slip.

F. Brake Binding

•

During driving apply brakes number of times and

then shift gear to neutral position and check free

rolling of vehicle. Check brake drums/brake

discs for overheating and if necessary jack up

the vehicle and check wheels for free rotation.

2. EXCESSIVE ENGINE OIL CONSUMPTION

High engine oil consumption may also lead to over-

hauling of the engine but before proceeding to

overhauling, check following points:

•

Make sure that there is absolutely no external oil

leakage i.e. from the camshaft oil seal, crank-

shaft oil seal, oil sump gasket, oil pump gasket,

and cylinder head cover gasket, turbocharger oil

feeder and return lines etc.

•

Ensure that the oil separator in the cylinder head

cover is properly mounted.

•

Check that no excessive oil found in the inter-

cooler piping and OMS is functioning properly.

•

If no external leakage is found, determine the

exact engine oil consumption, as per following

procedure.

DETERMINING EXACT ENGINE OIL CONSUMP-

TION

! CAUTION

Do not make a rough estimate of engine oil con-

sumption by noting the kilometers covered by the

vehicle at any random stage and finding oil con-

sumed from the topped up position taking into con-

sideration dipstick level and oil sump capacity.

PROCEDURE:

1. Once it is doubted that engine oil consumption is

higher, place the vehicle on a level ground.

2. Top up oil sump to its capacity of 7.5 liters.

3. Warm up the engine so that oil temperature is

75º- 80º 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.

8. Refill the weighed oil into the oil sump. Do not

spill any oil. The vessel used for draining should

not be used for any other purposes.

9. Drive the vehicle approx. 200 - 300 km. This

drive should include at least 30 - 40 kms. Of

highway or similar road, vehicle running at about

60 kmph.

10. Let this drive distance be ‘D’ kms.

11. Immediately after the test drive, place the vehicle

at the same spot from where it started.

12. Place the same previously used vessel below

the Oil sump.

13. Unscrew the drain plug and drain off oil into the

vessel. Drain the sump fully.

14. Weigh the vessel along with oil, now for the sec-

ond time. Let this weight be ‘w2’ Gms.

Find out standard oil consumption as follows:

If the engine oil consumption is more than 0.2 liter

per 1000 kilometers then it can be treated as high

engine oil consumption and the engine can be tak-

en for further investigation.

3. EXTREMELY LOW ENGINE OIL PRESSURE

Check the following:

•

External leakages.

•

Oil level in sump up to maximum mark on dip-

stick / Check oil level.