Guardian Technologies 004988-4 Manual De Usuario

Make ........................................................................................................Ford
Displacement .................................................................................... 3.0  liters
Cylinder Arrangement ...............................................................................V-6
Valve Arrangement ................................................................Overhead Valve
Firing Order ..................................................................................1-4-2-5-3-6
Number of Main Bearings ............................................................................4
Compression Ratio .............................................................................9.3 to 1
No. of Teeth on Flywheel ..........................................................................164
Ignition Timing at 1800 rpm ...............................................30 degrees BTDC
Spark Plug Gap ...................................................................0.042-0.046 inch
Recommended Spark Plugs

Motor Craft ..........................................................................AG, SF 32PGM

Oil Pressure .....................................................................................40-50 psi
Crankcase Oil Capacity .........................................5.0 U.S. quarts (4.7 liters)
Recommended Engine Oil .......................................................... SAE 5W-20
Type of Cooling System .................................. Pressurized, closed recovery
Cooling Fan ................................................................................Pusher Type
Cooling System Capacity .................................. 3.0 U.S. gallons (11.4 liters)
Recommended Coolant .............................................  Use a 50-50 mixture of 

ethylene glycol base and de-ionized water.

Natural Gas:

% of Load 

25% 

50% 

75% 

100%

m3/hr 3.1 

5.9 

8.5 

11.0

ft3/hr 

110.3 209.0 299.5 387.0

LP Vapor:

% of Load 

25% 

50% 

75% 

100%

m3/hr 1.3 

2.4 

3.5 

4.5

ft3/hr 45.6 

86.4 

123.8 

160.0

NOTE:

Fuel consumption is given at rated maximum 
continuous power output when using natural gas 
rated at 1000 Btu per cubic foot. LP gas is rated at 
2520 Btu per cubic foot. Actual fuel consumption 
obtained may vary depending on such variables as 
applied load, ambient temperature, engine condi-
tions and other environmental factors.

‹

‹

Fuel pressure for a natural gas set up should be five 
inches to 14 inches of water column (0.18 to 0.5 
psi) at all load ranges.

Fuel pressure for an LP vapor set up should be 11 
inches to 14 inches of water column (0.4 to 0.5 
psi) at all load ranges.

NOTE:

All models are configured for natural gas from the 
factory.

To reconfigure the fuel system from NG to LP vapor, 
follow these steps:

1.  Turn the main gas supply off.
2.  Remove the carburetor fuel hose from the outlet 

port (Port 1) of the demand regulator (Figure 
1.8).

3.  Remove the brass hose fitting from the outlet port 

(Port 1) of the demand regulator.

4.  Remove pipe plug from Port 2.
5.  Install brass hose fitting into Port 2.
6.  Install pipe plug into Port 1.
7.  Connect carburetor gas hose to brass fitting.
8.  Tighten all clamps and plugs.
9.  Make sure fuel supply is of the proper pressure 

and type for configuration.

10. Reverse the procedure to convert back to natural 

gas.

NOTE:

Port 1 is for NG only and Port 2 is for LP vapor 
only. No provision for dual fuel has been made.



 

 

7

  

Single-phase

 Model 

004988-4

  Rated Max. Cont. 

27 (NG), 30 (LP)

  AC Power Output (kW)
  Rated voltage (volts) 

120/240

  No. of Rotor Poles 

4

  Driven Speed of Rotor 

1800

  Rotor Excitation System 

Direct excited brush type

  Type of Stator 

4 Wire

  Rotor/Stator Insulation 

Class F/H