Vacuum Regulator (3N4630)
Usage:
(1) Adjustment nut.
(2) Pressure differential between carburetor gas inlet and air inlet for propane at 2500 BTU (low heat value 2250 BTU)
at idle speed ... -1 in. H2O(-25.4 mm H2O)
at full load ... -2 in. H2O(-50.8 mm H2O)
NOTE: These values are for first adjustments only. Make reference to the subject Adjustment to the Fuel to Air Ratio in the G342 Engine book, Form No. REG01525 for the correct last adjustments according to application of the engine.
(3) Pressure in supply line for propane:
Turbocharged engines ... 12 to 20 psi(85 to 140 kPa)
Naturally aspirated engines ... 3 to 20 psi(20 to 140 kPa)
Caterpillar Information System:
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