Page 47 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 2.11: Inspection of valve assembly components

Objectives

At the end of this exercise you shall be able to
• check the flatness of cylinder head surface by the straight edge and feeler gauge
• check the flatness of manifold by the straight edge and feeler gauge.
• check valve seat and valve guide.

Requirements

Tools/Instruments Materials/Components

• Trainee’s tool kit - 1 No. • Tray - 1 No.
• Straight edge - 1 No. • Cotton waste - as reqd.
• Feeler gauge - 1 No. • Soap oil - as reqd.
• Wire brush, scrapper - 1 No. • Lube oil - as reqd.
• Emery sheet - as reqd.
Equipments/Machines
• Diesel engine - 1 No.

Procedure

TASK 1: Checking flatness of cylinder head surface by straight edge and feeler gauge
• Clean the surface to be checked.
• Place the cylinder head (Fig 1) (1) on a plain surface, so that surface, to be checked, faces upward.
• Keep the straight edge (2) (Fig 1) on surface and press the straight edge at the centre with your left hand.

Fig 1

• Insert the feeler gauges (3) leaves between the straight edge (2) and the surface.

Note down the thickness of the thickest leaf/leaves which can be inserted between the straight
edge (2) and the surface. This thickness gives the maximum face out in that direction.
• Repeat above steps in four directions and note down the maximum face out in all the four directions.

• Recommend for resurfacing/replacement of cylinder head (1) if maximum face out in any one or more directions
is more than the limit specified by the manufacturer.
• Clean the feeler gauge thoroughly by using a cloth.

• Clean the gap of the work to be measured.

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