Page 61 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 2.19: Measure the clearance of piston, ring and

big end bearings

Objectives

At the end of this exercise you shall be able to
• check the piston ring close gap
• check the clearance between the piston and cylinder wall
• check the clearance between crank pin and big end bearing.

Requirements

Tools/Instruments Materials/Components
• Trainee’s tool kit - 1 No. • Cotton cloth - 1 No.
• Feeler gauge - 1 No • Soap oil - as reqd.
• Torque wrench - 1 No. • Piston ring - as reqd.
• Plastic gauge - 1 No. • Big end bearing - as reqd.
Equipments/Machines
• Multi cylinder diesel engine - 1 No.
• Work bench - 1 No.

Procedure

TASK 1: Measure the piston ring close gap (end gap) (Fig 1)
• Clean the cylinder bore with baniyan cloth
• Clean the selected piston ring for measurement.
• Insert the piston ring inside of the cylinder bore

• Ensure the piston ring placed in specified level in side of cylinder bore (push the ring in the cylinder by
piston head without rings)
• Measure the piston ring, close gap by feeler gauge

• Note the feeler gauge leaf reading and compare with service manual specification.

Fig 1

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