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— 9 —

CAUTION: Never run this equipment without the complete
air cleaner system installed on the engine. This could result
in premature wear to the engine.

Use the following instructions to clean or replace the

air cleaner components.

1.

Loosen the two screws on the air cleaner cover. Remove the
air cleaner cover (Figure 6).

Figure 6 — Removing the Air Cleaner Cover

2.

Remove the paper air filter and the foam pre-filter from the
air cleaner cover (Figure 7).

Figure 7 — Air Cleaner Components

CHOKE

CHOKE

3.

To clean or replace the foam pre-filter:

A. Wash the pre-filter in soapy water.

B. Squeeze the pre-filter dry with a clean cloth. DO 

NOT TWIST.

NOTE: If the pre-filter is still dirty after washing and drying it, 

replace it with a new one.

C. Apply enough clean engine oil to saturate the pre-

filter.

D. Wrap the pre-filter in a clean dry cloth and squeeze 

out the excess oil. DO NOT TWIST. Set the pre-filter 
aside.

4.

To clean or replace the paper air filter:

A. Clean the air filter by tapping it gently on a solid 

surface.

NOTE: If the filter is too dirty, replace it with a new one.

Dispose of the old filter properly.

5.

Clean the air cleaner cover.

6.

Insert the pre-filter into the cover, then the paper air 
filter (see Figure 7).

7.

Reinstall the air cleaner cover and tighten the two (2)
screws (see Figure 6).

REPLACING THE SPARK PLUG

Use a Champion RC12YC spark plug or equivalent. The 
correct air gap is 0.76mm (0.030 in.). Remove the plug every
100 hours of operation or once each year, whichever comes
first. This will help your engine to start easier and run better.

1.

Stop the engine and pull the spark plug wire off of the
spark plug.

2.

Clean around the spark plug and remove it from the 
cylinder head.

Foam 

Pre-Filter may

stick to cover

Paper
Filter

Foam

Pre-Filter

Summary of Contents for GN - 320

Page 1: ...N NS S W WH HI IC CH H I IF F N NO OT T F FO OL LL LO OW WE ED D C CO OU UL LD D E EN ND DA AN NG GE ER R T TH HE E P PE ER RS SO ON NA AL L S SA AF FE ET TY Y A AN ND D O OR R P PR RO OP PE ER RT TY...

Page 2: ...FOR SAFE OPERATION Study these RULES FOR SAFE OPERATION carefully before operating or servicing this equipment Become familiar with the OWNER S MANUAL and with the engine The engine can operate safel...

Page 3: ...gas if breathed in sufficient concentrations can cause unconsciousness or even death Operate this equipment only in the open air where adequate ventilation is available Do not insert any object throug...

Page 4: ...bout parts and service always supply the complete model number and serial number of your unit as given on its data plate decal The warranty and replacement parts for this engine are included in the ow...

Page 5: ...l before each use and change the oil regularly Failure to use the correct oil or using dirty oil can cause premature engine wear and failure The recommended oils include the following During summer mo...

Page 6: ...from the crankcase Figure 1 2 Add engine oil until the oil level is to the point of overflowing Figure 1 Oil Fill Cap CHECKING ENGINE OIL 1 Check the engine oil level before starting the engine each t...

Page 7: ...a low oil pressure sensor that shuts down the engine automatically when the oil pressure drops below 8 psi If the engine shuts down by itself and the fuel tank has enough gasoline check the engine oi...

Page 8: ...plug remove the plug and drain the oil completely into a suitable container Figure 5 Figure 5 Oil Filter and Drain Plug 2 When the oil is drained install and tighten the oil drain plug 3 If your engin...

Page 9: ...Apply enough clean engine oil to saturate the pre filter D Wrap the pre filter in a clean dry cloth and squeeze out the excess oil DO NOT TWIST Set the pre filter aside 4 To clean or replace the pape...

Page 10: ...r head Figure 8 Setting Spark Plug Gap CLEANING THE SPARK ARRESTOR SCREEN The engine exhaust muffler has a spark arrestor screen Inspect and clean the screen every 100 hours of operation or once each...

Page 11: ...e e 11 CARBURETOR ADJUSTMENTS The carburetor of your engine is pre set at the factory The carburetor should not be tampered with because this will VOID THE EMISSION CONTROL SYSTEM WARRANTY If you expe...

Page 12: ...CHEDULE Every 8 Hours or 25 Hours or Every 50 Hours or Every 100 Hours or Every MAINTENANCE OPERATION or Daily Season Season Season Check Oil Level X Change Oil See Note 1 Change Oil Filter if so equi...

Page 13: ...l stabilizer or an equivalent will prevent gum deposits from forming in the engine s fuel system 2 While the engine is still warm drain the oil from the crankcase Refill with it with fresh oil See BEF...

Page 14: ...14 Generac GN 320 360 410 Engine E E X X P P L L O O D D E E D D V V I I E E W W L L O O N N G G B B L L O O C C K K G G N N 3 3 2 2 0 0 3 3 6 6 0 0 4 4 1 1 0 0 10C 21A 21B 3C 4C...

Page 15: ...1B 21713B 1 Cylinder Head Gasket 410 22 78691 1 Oil Pressure Reliefcover 23 A5771 1 Pressure Relief Spring 24 A5776 1 Pressure Relief Ball 25 76361 1 Thrust Washer 26 A8898B 1 Gear Cover 27 86514 2 Va...

Page 16: ...6 G Ge en ne er ra ac c G GN N 3 32 20 0 3 36 60 0 4 41 10 0 E En ng gi in ne e E EX XP PL LO OD DE ED D V VI IE EW W A AI IR R C CL LE EA AN NE ER R A AN ND D C CA AR RB BU UR RE ET TO OR R 43A 43B 4...

Page 17: ...Adapter 91028 1 37 M6 Lock Washer 22097 3 38 M6 Hex Nut 49813 2 39 Carburetor Air Box 90970 1 Gasket 40 M6 Ribbed Lock 93873 2 washer 41 Spitback Plate 91204 1 42 Carburetor Manifold 89228 1 Gasket 43...

Page 18: ...T TA AN NK K M MO OU UN NT TI IN NG G H HA AR RD DW WA AR RE E ITEM PART QTY DESCRIPTION 22 40976 2 SHCS M8 1 25 X 20 26 22129 2 Lock Washer M8 94 B2348 1 Tank Cradle 95 52858 2 M8 Lock Nut 96 59012 2...

Page 19: ...DE ED D V VI IE EW W O OI IL L F FI IL LT TE ER R A AN ND D O OP PT TI IO ON NA AL L O OI IL L F FI IL LL L T TU UB BE E ITEM PART QTY DESCRIPTION 2 86999 1 Oil Filter Gasket 3A 72709 1 Oil Blockoff 3...

Page 20: ...Decal 10 93611 1 Black Sleeving 12 84329 1 3 Pin Male HSG 13 92981 1 Wire Assembly 14 22097 2 M6 Lockwasher 15 92079 2 M6 X 30 Taptite 16 84542 1 Ignition Coil 18 87221B 1 L O S Module 20 72347 1 Spa...

Page 21: ...3 B2160 1 Rubber Spacer 21 G Ge en ne er ra ac c G GN N 3 32 20 0 3 36 60 0 4 41 10 0 E En ng gi in ne e E EX XP PL LO OD DE ED D V VI IE EW W S ST TE EP PP PE ER R M MO OT TO OR R F FL LY YW WH HE EE...

Page 22: ...ner you should however be aware that Generac Corporation may deny you warranty coverage if your utility or lawn and garden equipment engine or a part thereof has failed due to abuse neglect improper m...

Page 23: ...related part which is scheduled for replacement as required maintenance in the Owner s Manual shall be warranted for the period of time prior to first scheduled replacement point for that part If the...

Page 24: ...ervice and does not apply to engines or parts which have been subjected to improper or unauthorized installation misuse negligence accident overloading over speeding improper maintenance improper repa...

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