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gas may be installed. LNG vehicles require insulated, pressurized (10 to 35 psi) fuel tanks. LNG is vaporized
in the fuel line and warmed in the heat exchanger generally located under the hood. Pressure is reduced by
the pressure regulator before the vapors are transported to the mixer/carburetor.
MAINTENANCE
Service manuals supplied by converters and installers should be consulted for maintenance of NGV-specific
parts. Components such as the pressure regulator/reducer can be checked with a pressure gauge to deter-
mine if the unit is operating properly. Measurements with an EGA can indicate proper air/fuel mixtures and
ignition timing. NGV maintenance issues are briefly listed below.
CNG Cylinders - CNG cylinders must periodically be recertified to maintain compliance with DOT stan-
dards. The Compressed Gas Association has published several pamphlets with recommendations of stan-
dards for the inspection of compressed gas cylinders.
Oil Changes - Due to the clean burning characteristics of natural gas, collection of particulate matter in
engine oil does not occur as rapidly as with gasoline. However, even though visual inspection of the oil may
indicate that the oil is clean, oil compounds break down under engine heat. These chemical changes reduce
the lubricating ability of the oil and stress the engine system. Therefore, it is recommended that the oil should
be changed according to manufacturer recommendations, despite oil appearance. (NOTE: Considerably
more data is needed to determine the conditions that influence reports of NGV oil maintaining lubricating
properties longer than in gasoline engines.)
Spark Plugs - Spark plugs should be replaced as recommended by the vehicle manufacturer.
CAUTION: Do not use CNG pressure or vent lines to clamp, hang, connect or attach any items including
harnesses, hoses, power steering hose, refrigerant hoses or any other item.
MANUAL FIVE SPEED TRANSMISSION
The standard transmission used in the TCFE is a five-speed Synchro-Mesh trans-
mission. Refer to the gearshift knob for proper shift sequence.
Disengage the clutch and move the lever into first or reverse gear.
If the lever does not engage immediately, let the clutch partially back-up, while
keeping a gentle pressure against the shift lever until full engagement is accom-
plished.
CAUTION: Do not "ride the clutch" by resting your foot on the clutch when not
shifting gears. Do not use the clutch to hold the vehicle at a standstill on an up-
grade, as when waiting for a traffic light. Such misuse could cause premature
clutch wear and damage.
ALLISON AUTOMATIC TRANSMISSION
AT 545 & MT 643
The Allison transmission provides four forward speeds and one reverse. Selective control is obtained
through the selector lever located on the right area of dash. The selector lever must be in "N" (neutral) to start
the engine. If the engine starts in any other position, the neutral start switch is malfunctioning. Use "D" for all
normal driving conditions. The vehicle will start in first gear and as you depress the accelerator, the transmis-
sion will upshift to second, third and fourth gear automatically. As the vehicle slows down, the transmission
will automatically downshift to the correct gear. Use (3&2) when the road load or traffic conditions make it
desirable to restrict the automatic shifting to a lower range. When the conditions improve, return the range
69
2
R
4
N
1
3
5
DEPRESS CLUTCH
TO START ENGINE
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