Generac Guide to Generator Valve Adjustment and Valve Clearance Adjustment
Page 19

Section 3 — Maintenance

Commercial-Industrial-Residential Portable Generator System

Figure 21 - Spark Arrestor

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.

MUFFLER OUTLET

TUBE

RETAINER

SPARK ARRRESTOR

SCREEN

RETAINING

SCREW

3.6 ADJUSTING VALVE CLEARANCE

After the first 50 hours of operation, you should adjust the valve clearance in the engine.

Important: If you feel uncomfortable about doing this procedure or you don't have the proper tools, please take your generator in to the nearest service center to have the valve clearance adjusted. This is a very important step to insure longest life for your engine.

To adjust valve clearance:

•Make sure the engine is at room temperature.

•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.

•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. While watching the piston through the spark plug hole. The piston should move up and down. The piston is at TDC when it is up as high as it can go.

•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: You must hold the rocker arm jam nut in place as you turn the pivot ball stud.

When valve clearance is correct, hold the pivot ball stud in place with

Figure 22 - 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 you will not be able to get all the screws in place. Make sure the valve cover gasket is in place.

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

•Repeat the process for the other cylinder.

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Contents Ultra Source Safety Rules General Information Introduction General Hazards Important Safety InstructionsExplosion Hazards Electrical HazardsFire Hazards Assembling the Wheel KIT AssemblyAccessory BOX UnpackingHandle Assembly Battery ConnectionVolt AC, 30 Amp Locking Receptacle Supplies Know the GeneratorWinter / Summer Valve See Cold Weather Operation 1 AC, 20 AMP, Duplex Receptacle Cord Sets and Connection Plugs2 120V AC, 20 AMP, Gfci Receptacle 5 12 Volt DC, 10 AMP Receptacle 120V 30AGrounding the Generator HOW to USE the GeneratorConnecting Electrical Loads DON’T Overload the GeneratorDevice Wattage Reference GuideBefore Starting the Generator Adding Engine OILAdding Gasoline To Start the EngineStopping the Engine Automatic Idle ControlCold Weather OPERATION/ DE-ICER LOW OIL Pressure Shutdown SystemTo recharge 12 Volt batteries, proceed as follows Charging a BatteryEngine Specifications Maintenance ScheduleProduct Specifications Generator SpecificationsGeneral Recommendations Clean Spark Arrestor Screen Service AIR CleanerTo adjust valve clearance Adjusting Valve ClearanceLong Term Storage Storage GeneralOther Storage Tips Problem Cause Solution TroubleshootingCommercial-Industrial-Residential Portable Generator System Commercial-Industrial-Residential Portable Generator System Bearing Stator Closest Wiring Diagram Drawing No E0228Schematic Drawing No E0229 GT-990 & GT-760 Engine Page 1 Drawing No E0034 46 45 43 42QTY Description GT-990 & GT-760 Engine Page 2 Drawing No E0034 DetailaPart NO. QTY Description Generator Drawing No D4488 QTY. Description Exploded Residential No E0227 Control Panel Drawing No E0227 Part NO. QTY. DescriptionFrame, Handle & Wheel Kit Drawing No E0695 DetailRubber Tank Mount BOX 297 WHITEWATER, WI California Emission Control Warranty StatementEmission Control System Warranty Warranty Schedule Part No E0226 06/01/02

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