Page 232 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

Servicing of CNG Reducer
Note: CNG reducer servicing is to be done when the vehicle fuel economy is poor, poor pickup and
vehicle running is nor smooth.

Fig 2

11 Remove battery `-ve’ cable
12 Shut off the fuel valve or cylinder
13 Disconnect the CNG reducer gas inlet pipe line connection and outlet pipe connection.
14 Remove the coolant hose connections from the CNG reducer

15 Remove the high pressure solenoid valve electrical connections
16 Remove the CNG reducer ground connection
17 Remove the reducer low pressure solenoid valve electrical connection
18 Remove the CNG reducer gauge unit positive (+ve) and negative (-ve) supply

19 Remove the complete CNG reducer unit from the vehicle chassis by removing supporting stud nuts and drain
oil from reducer unit
20 Remove the gauge sensor unit holding nut, washer and detach the gauge unit with solenoid
21 Mark on the reducer casing (reference mark for dismantling and assembling

22 Remove the low pressure solenoid nut of CNG reducer kit.
23 Remove the low pressure solenoid and holding unit
24 Remove the low pressure side diaphragm casing bolts
25 Remove the low pressure diaphragm cover.
26 Remove the diaphragm spring, o ring, diaphragm nut and diaphragm

27 Remove the actuating unit of diaphragm
28 Remove the CNG reducer backside cover by removing bolts
29 Mark the reference mark on the casing
30 Remove the high pressure reducing diaphragm (Ist stage)

31 Remove the 1st stage diaphragm actuating lever unit and valve
32 Remove the 2nd stage diaphragm unit from CNG reducer unit
33 Remove the idle adjuster unit

215
CITS : Automotive - Mechanic Diesel - Exercise 14.2