Generac Power Systems 5252, 5254, 5251, 5255, 5253 owner manual Cooling System, Cooling Vent Locations

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Section 4 — Maintenance

Remove spark plug wires and position wires away from plugs.

Remove spark plugs.

Make sure the piston is at Top Dead Center (TDC) of its compression stroke (both valves closed). To get the piston at TDC, remove the intake screen at the front of the engine to gain access to the flywheel nut. Use a large socket and socket wrench to rotate the nut and hence the engine in a clockwise direc- tion. While watching the piston through the spark plug hole. The piston should move up and down. The piston is at TDC when it is at its highest point of travel.

To adjust valve clearance (if necessary):

Make sure the engine is at 60° to 80° F.

Make sure that the spark plug wire is removed from the spark plug and out of the way.

Remove the four screws attaching the valve cover with a #2 or #3 Phillips screwdriver.

Loosen the rocker jam nut. Use an 10mm allen wrench to turn the pivot ball stud while checking clearance between the rocker arm and the valve stem with a feeler gauge. Correct clearance is 0.002-0.004 inch (0.05-0.1 mm).

NOTE:

Air-cooled Generators

Install spark plugs.

Re-attach the spark plug wire to the spark plug.

On the GT-530 and GT-990, repeat the process for the other cylinder.

4.8COOLING SYSTEM

Air inlet and outlet openings in the generator com- partment must be open and unobstructed for con- tinued proper operation. This includes such obstruc- tions as high grass, weeds, brush, leaves and snow.

Without sufficient cooling and ventilating air flow, the engine/generator quickly overheats, which causes it to quickly shut down. (See Figure 4.11 for vent loca- tions.)

Make sure the doors and roof are in place dur- ing operation as running the generator with them removed can effect cooling air movement.

Figure 4.11 – Cooling Vent Locations

Hold the rocker arm jam nut in place as the pivot ball stud is turned.

When valve clearance is correct, hold the pivot ball stud in place with the allen wrench and tighten the rocker arm jam nut. Tighten the jam nut to 174 in/lbs. torque. After tightening the jam nut, recheck valve clearance to make sure it did not change.

Figure 4.10 - Valve Clearance Adjustment

Rocker

Pivot BallArm

Stud

Jam Nut

Valve

Stem

Install new valve cover gasket.

Re-attach the valve cover. NOTE:

Start all four screws before tightening or it will not be possible to get all the screws in place. Make sure the valve cover gasket is in place.

The exhaust from this product gets extremely hot and remains hot after shutdown. High grass, weeds, brush, leaves, etc. must remain clear of the exhaust. Such materials may ignite and burn from the heat of the exhaust system.

The maximum ambient temperature for the gen- erator is 40° C (104° F).

4.9ATTENTION AFTER SUBMERSION

If the generator has been submerged in water, it must not be started and operated. Following any submer- sion in water, have an Authorized Dealer thoroughly clean, dry and inspect the generator. If the structure (ex. home) has been flooded, it should be inspected by a certified electrician to ensure there won't be any electrical problems during generator operation or when utility is returned.

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Contents Listed Authorized Dealer Location IntroductionMaintenance Post Installation Start-up AdjustmentsTroubleshooting Introduction Inside Front Cover Warning  ‹ Standards Index  Electrical Hazards Protection Systems UNPACKING/INSPECTIONBreaker for Bedrooms 7kW, Single Cylinder GH-410 Engine Generator‹ 1.5.1 Generator Specifications‹ 1.5.2 Engine Fuel Requirements Recommendations System SET LEDFuel Consumption ‹ 1.8.1 BTU Flow Requirements Natural GAS‹ 1.9.1 7 KW, 410CC Engine Reconfiguring the Fuel System‹ 1.9.2 10, 13 and 16KW, V-TWIN Engines ‹ 1.10.1 Generator LocationBattery Installation Battery Requirements‹ 1.10.2 Transfer Switch 10.2.1 7, 10, 13, and 16 kW Units if equipped10 Battery Cable Connections BatteryBefore Initial START-UP Check Transfer Switch OperationElectrical Checks Checking Automatic Operation Generator Tests Under Load7KW Natural GAS only ‹ 2.7.1 7 KW Units Engine Governor Adjustment‹ 3.1.3 Manual Position ‹ 3.1.1 Auto PositionSequence of Automatic Operation Automatic Transfer OperationManual Transfer Operation ‹ 3.1.4 Choke Operation‹ 3.4.2 Transfer Back to Utility Power Source Setting the Exercise Timer‹ 3.6.2 High Temperature Switch ‹ 3.6.1 LOW OIL Pressure Switch‹ 3.6.3 Overcrank Approximate Crank Cycle TimesChecking the Engine OIL Level ‹ 3.6.6 LOW BatteryFuses ‹ 3.6.5 RPM Sensor Failure‹ 4.3.1 OIL Change Intervals Changing the Engine OIL‹ 4.3.2 Engine OIL Recommendations ‹ 4.4.1 7, 13, and 16KW Generators Spark Plugs‹ 4.4.2 10KW Generators Valve Clearance Battery Maintenance11 Cooling Vent Locations Cooling System‹ 4.11.2 Return to Service OUT of Service Procedure‹ 4.11.1 Removal from Service Corrosion ProtectionBe performed by the nearest Authorized Dealer Service ScheduleProblem Cause Correction Troubleshooting GuideAir-cooled Generators Air-cooled Generators Air-cooled Generators Mounting Dimensions Electrical Data Engine Wiring Customer Connection Battery Charger Engine Alternator Engine Wiring Stator Electronic Voltage Regulator Manual Auto Scsm Neutral Electrical Data Electrical Data Sheet Metal PAINT/MATERIAL Code Legend Part NO. QTY. Description Air-cooled Generators Control Panel Drawing No F9695-C QTY Description Exploded Views and Parts Lists BOX Load Center Exploded Views and Parts Lists Description QTY Exploded Views and Parts Lists Washer Flat M8 5/16 Exploded Views and Parts Lists Crankcase Exploded Views and Parts Lists Intake Adapter Exploded Views and Parts Lists PIN, Piston D20 Exploded Views and Parts Lists SCREW, Taptite M6-1.0X8 Yellow Chrome Air-cooled Generators 7kW, GN-410 Engine Drawing No F9422-B ADAPTOR, Engine Exploded Views and Parts Lists ADATOR, Engine 7KW CASTING, Twin Regulator Housing 7KW Exploded Views and Parts Lists Brkt Regulator Mounting MANUFACTURER’S Emission Control System Warranty Coverage Your Warranty Rights and ObligationsPURCHASER’S/OWNER’S Warranty Responsibilities Emission Related Parts Include the Following Emission Control System WarrantyGenerac Power Systems Standard Limited Warranty for