Page 231 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 14.2: Overhaul conventional type CNG Kit

Objectives

At the end of this exercise you shall be able to
• to the overhaul the conventional type CNG Kit Components
• adjust the idle speed and peak speed of engine while running on CNG.

Requirements

Tools/Instruments Materials
• Mechanic tool kit, - 1 No. • Soap solution - as reqd.
• Gas exhaust analyser, - 1 No. • Cotton waste - as reqd.
• CNG reducer overhauling kit - 1 No. • Waste cloth - as reqd.

Equipment/Machines • Kerosene - as reqd.
• Wire brushes - as reqd.
• A light motor vehicle retrofitted CNG
conventional kit - 1 No.

• 5 Gas Exhaust Analyzer - 1 No.
Procedure

1 Stop the vehicle in plain surface.
2 Apply hand brake.
3 Open the rear boot.
4 Check the manual shut off valve in open condition.
5 Open the engine head.

Fig 1

Visual inspection
6 Visually inspect for loose, damaged, disconnected or incorrectly routed wires.
Checking of Gas Leaks
7 Check the CNG Gas leak in the pipe line fittings and other CNG kit components fittings side using soap
solution.
8 Check the Gas leak on filler valve side. If `O’ ring damaged, replace with new one. If gas leaks on filler valve
9 Purge the fuel lines which are leaking.
10 Replace the damaged pipe line fitting.

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