Page 52 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 2.14: Check valve leakage and overhauling

rocker arm assembly

Objectives

At the end of this exercise you shall be able to
• check the valve seat leakage with special tool
• check the rocker shaft and levers for wear and cracks
• reassemble the rocker shaft and levers in proper method.

Requirements

Tools/Instruments Materials/Components
• Trainee’s tool kit - 1 No. • Tray - 1 No.
• Valve leakage test tool - 1 No. • Cotton cloth - as reqd.
• Soap oil - as reqd.
Equipments/Machines
• Valve grinding stick - as reqd.
• Work bench - 1 No. • Valve lapping paste - as reqd.
• Wooden block - 2 Nos.
• Diesel engine - 1 No.

Procedure

TASK 1: Checking valve leakage (Fig 1)
• Check the valve leakage using the special tool Fig 1
(Fig 1)
• Attach a suction cup (1) with a suction bulb (2) and
vacuum gauge (3) on the cylinder head (4)

• Covering the cylinder head valve seat (5) and create
a vacuum with the help of the suction bulb (1) (rubber
bulb)
• Wait for 3 minutes and note any drop of vacuum on
the gauge

• If there is any drop in vacuum, the valve seat (5) is
leaky and requires lapping.
• After lapping the valve seat, assemble the valve and
check for leakage as above mentioned procedure.

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CITS : Automotive - Mechanic Diesel - Exercise 2.13