Page 63 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 2.20: Check connecting rod for bend and twist

Objectives

At the end of this exercise you shall be able to
• check the connecting rod bend and twist
• assemble the piston and connecting rod.

Requirements

Tools/Instruments Materials/Components
• Trainee’s tool kit - 1 No. • Tray - 1 No.
• Torque wrench, Ring expander - 1 No each. • Cotton cloth - as reqd.
• Mallet, Drift punch - 1 No each. • Kerosene - as reqd.
• Feeler gauge, Circlip plier • Soap oil - as reqd.
(internal) - 1 No each. • Lube oil - as reqd.
• Connecting rod aligner - 1 No.
Equipments/Machines
• Multi cylinder diesel engine - 1 No.

Procedure

• Place the connecting rod assembly on the work bench and remove the piston from the connecting rod

• Clean the dismantled piston and connecting rod.
• Check the connecting rod’s small end bush bearing for wear and scoring.
• Check the connecting rod’s alignment for bend and twist.
• Check the gudgeon pin surface for any damage.
• Place the connecting rod on the alignment fixture (1). (Fig 1)

• Insert the gudgeon pin in the small end bore.
• With a square edge (2) check the square seating of the gudgeon pin. If the connecting rod is bent or twisted,
the gudgeon pin will not sit squarely in the bore. Replace the connecting rod if found bent or twisted.
• Fit one circlip in the groove of the piston. (Fig 2)

Fig 1 Fig 2

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