Subaru Robin Power Products EY33-2, EY44-2 manual Pilot System, Disassembly and Reassembly

Page 27

9-1-2 PILOT SYSTEM

This pilot system feeds fuel to engine during idle and low speed operation.

The fuel fed through main jet (MI) is measured b y pilot jet (PJ), mixed with air measured by pilot air jet (PAJ), regulated by pilot screw, and then fedto engine through pilot outlet (PO) and bypass (BP).

The fuel is mainly fed from pilot outlet(PO) during idling.

9-1-3 MAIN SYSTEM

This system feeds fuel to engine during medium andhigh-speed operation.

The air measured by main air jet (MAJ) is mixed into fuel through bleed holesof main nozzle (MN) and discharged t o main bore (MB) as atomized fuel where it is mixed with intake air through air cleaner to become an optimum air-fuel mixutre to b e supplied to engine.

9-1-4 CHOKESYSTEM

Thechokesystem serves tofacilitatestart-upincoldseason.Whenengine is crankedwithchoke (C) closed,thenegative pressure t o main nozzle (MN) increases to introduce fuel inlarge quantities to make start-up easy.

9-2DISASSEMBLY and REASSEMBLY

 

 

Besides mechanical,failures,mosttroublesarecausedby

 

incorrect mixing ratio.

 

 

 

Themostcommoncauses

ofsuchincorrect

fuel-air mix-

5

turesare clogged jets,restrictedairandfuel passages, and

7

variationsinfuel

level.

Inordertoobtainthefull

 

 

 

performance of carburetor, it is necessary tokeepair

6

cleanerandcarburetorclean

so that air

andfuelflow

1

without any restriction.

 

 

 

 

7

Observefollowingdisassemblyandreassemblyprocedures.

8

(See Fig. 9-2)

 

 

 

25

9-2-1THROTTLE

SYSTEM

 

24

 

 

1)RemovePhilipsscrew(11 ), removethrottle valve ( 1 5 ) ,

and then pull out throttle shaft (16).

2 ) Detachspring (7) by unscrewingthrottlestopscrew

(8).

9-2-2 CHOKESYSTEM

1 ) UnscrewPhilipsscrew(1l),removechoke valve (9), pull out choke shaft ( I O ) , and then remove choke ball (1 2) and choke spring( 1 3) .

2 ) Whenreassembiing choke shaft, placethenotchof choke valve on main air jet side.

Fig. 9-2

-23-

Image 27
Contents Page Diesel FuelSystem RUN-INOPERATION TroubleshootingSPEC1FICATIONS 3MAXIMUMTORQUEANDFUEL Consumption RATIOATMAX.OUTPUT Performance1MAXIMUMOUTPUT ContinuousratedoutputFeatures Performance CurveModel EY44-2 FLYWHEELCOOLI~GFAN Lighting CoilSEl Camshaft CrankcaseMainbearing Cover CrankshaftLubrication 15AIRCLEANER10GOVERNOR CoolingExhaust GAS Evacuation InstallationMounting 2VENTILATIONENGINEwithSTARTINGMOTOR Rope StartingengineSpecialtools 1PREPARATIONS and Suggestions5GOVERNORLEVER and Carburetor 2BLOWER Housing and Cylinderbaffle3AIRCLEANER 4MUFFLERTappet Chamber with the Compressor 0oss Valve and Valvestemholeclearance9CYLINDERBLOCK Adjusting Tappet Clearance FigCamshaft and Tappet 12CONNECTING ROD and PistonPiston and Connecting ROD Assembly of Connecting RODPiston Ring See Fig 13CRANKSHAFT -3-13 Magneto See Fig 4MAGNETO Service InstructionsChecking Ignition Spark Governor Adjustment Carburetor Operation and Construction see Figs -1-1andFloat System Pilot System Disassembly and Reassembly5FLOATSYSTEM 3ADJUSTMENT3PILOT System 4MAIN SystemRUN-IN Operation of Engine after Reassembly Startingdifficulties 11 1 1 Fuel SystemCompression System Engine Misses Engine StopsEngineoverheats 11-6ENGINE Backfires Through Carburetor 11-5ENGINE KnocksChecks and Corrections Size Orrection TableIo.1 +o.1 01500 250-300 18-2 134EVERY 100 200 Hoursmonthly Checks and Maintenance Daily Checks and MaintenanceEVERY20HOURS Checks and Maintenance Every 50 HOURS10DAY Checks and Maintenance13-7PREPARATION for Long Abeyance Maintenance13-6EVERY 1000 Hours Yearly Checks and Maintenance 13-5EVERY 500 600 Hourssemianual ChecksPage Page Industrial Engines