Page 171 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

When engine runs and get heat up, air in empty space in sump also get heated up and expands. In olden engine
some sumps also heated up and expands. In olden engines some sump press combustion gases leak in sump. If
these pressure is not let off, then this will increase further and damage the oil seal etc. and gases leak from there
is to save from this the pipe of engine block is connected with inlet manifold so that gases of block can be sucked
and again burn out.

Must due to strong circulation of oil in system also sometimes failure therefore let’s study about
troubleshooting in lubrication system with causes and with its remedies

S.No Troubleshooting Causes of failure Remedies

1 Low oil pressure 1 Less oil in crankcase 1 Oil top-up
2 Use of low viscosity oil 2 Use proper grade of oil

2 Worn out main and big end Low oil pressure Replace the bearings and set the
bearing proper oil pressure
3 Leaky oil filter, oil pipe Seal loose, pipe loose Replace the seal

4 Low oil pressure Chocked suction oil strainer Remove old oil and flushing the
system
5 High oil pressure • Use of high viscosity oil Setting the proper oil pressure
• Defective oil pressure adjustment and check the wiring
gauge harness of gauge
• Sticky regulating valve
incorrect setting of pressure
regulating valve

158
CITS : Automotive - Mechanic Diesel - Lesson 39 - 46