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ENGINE SPECIFICATIONS
Make ..................................................................................Mitsubishi
Displacement....................................................92 inches
3
(1.5 liters)
Cylinder Arrangement ..........................................................4, in-line
Valve Arrangement ....................................................Overhead Cam
Firing Order ............................................................................1-3-4-2
Number of Main Bearings ................................................................5
Compression Ratio....................................................................9 to 1
No. of Teeth on Flywheel ..............................................................104
Ignition Timing
at 1800 rpm........................................................35 degrees BTDC
at 3600 rpm........................................................43 degrees BTDC
Spark Plug Gap ......................................................0.020-0.025 inch
Recommended Spark Plugs
Champion ........................................................................RN11YC4
Oil Pressure ........................................................................30-50 psi
Crankcase Oil Capacity ............................4.0 U.S. quarts (3.8 liters)
Recommended Engine Oil ............................................SAE 15W-40
Type of Cooling System ......................Pressurized, closed recovery
Cooling Fan ....................................................................Pusher Type
Cooling System Capacity............................2 U.S. gallons (7.6 liters)
Recommended Coolant ................................Use a 50-50 mixture of
ethylene glycol base.
FUEL CONSUMPTION
Models 004474, 004475
Using Natural Gas..............................................441 cu. ft. per hour
Using LP Gas ..................................175 cubic ft.(4.8 gal.) per hour
Models 004370, 004371
Using Natural Gas..............................................359 cu. ft. per hour
Using LP Gas..................................143 cubic ft. (4.0 gal.) per hour
Models 004188, 004189
Using Natural Gas..............................................277 cu. ft. per hour
Using LP Gas ..................................110 cubic ft.(3.1 gal.) per hour
NOTE:
Fuel consumption is given at rated maximum con-
tinuous power output when using natural gas rated
at 1000 Btu per cubic foot; or LP gas rated 2520 Btu
per cubic foot. Actual fuel consumption obtained
may vary depending on such variables as applied
load, ambient temperature, engine conditions and
other environmental factors.
TORQUE SPECIFICATIONS
Cylinder Head ..................................................15 (+ 90° + 90°) ft.lb.
Intake Manifold ......................................................................13 ft.lb.
Exhaust Manifold ..................................................................13 ft.lb.
ENGINE OIL RECOMMENDATIONS
The unit has been filled with 15W-40 engine oil at the fac-
tory. Use a high-quality detergent oil classified “For
Service CC, SD, SE, SF.” Detergent oils keep the engine
cleaner and reduce carbon deposits. Use oil having the
following SAE viscosity rating, based on the ambient tem-
perature range anticipated before the next oil change:
Any attempt to crank or start the engine before
it has been properly serviced with the recom-
mended oil may result in an engine failure.
COOLANT RECOMMENDATIONS
Use a mixture of half low silicate ethylene glycol base
anti-freeze and half soft water. Cooling system capacity
is about 8 U.S. quarts (7.6 liters). Use only soft water
and only low silicate anti-freeze. If desired, add a high
quality rust inhibitor to the recommended coolant mix-
ture. When adding coolant, always add the recommend-
ed 50-50 mixture.
Do not use any chromate base rust inhibitor
with ethylene glycol base anti-freeze or chromi-
umhydroxide (“green slime”) forms and will
cause overheating. Engines that have been oper-
ated with a chromate base rust inhibitor must be
chemically cleaned before adding ethylene glycol
base anti-freeze. Using any high silicate anti-
freeze boosters or additives will also cause over-
heating. We also recommend that you DO NOT
use any soluble oil inhibitor for this equipment.
BEFORE INSTALLATION
Before installing this equipment, check the ratings of both
the generator and the transfer switch. Read “Emergency
Isolation Method” and “Total Circuit Isolation Method” in
the installation manual (Part No. 079699).
The generator’s rated wattage/amperage capacity must
be adequate to handle all electrical loads that the unit
will power. You may have to group the critical (essential)
loads together and wire them into a separate “emer-
gency” distribution panel.
This generator can be installed in conjunction with a
standard Generac “GTS” type transfer switch, if desired.
The standard transfer switch has no sensing or con-
trolling circuit boards. Instead, the generator control
console houses a “Control Module Assembly”, which
controls all phases of operation, including engine start
up and load transfer.
Section 1 — General Information
Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators
Generac
®
Power Systems, Inc. 7
Temperature Oil Grade (Recommended)
Above 80° F (27° C) SAE 30W or 15W-40
32° to 80° F (-1° to 27° C) SAE 20W-20 or 15W-40
Below 32° F (0° C) SAE 10W or 15W-40