TM 5-4240-501-14&PCARBURETIONKerosene and Fuel PumpsTo re-assemble filter, insert element into filter head withthe round washer entering first. The gasket is put on thefilter body. The spring is located in the filter body so thatwhen filter body and head are put together, the spring willhold the element against the head. Tighten body andhead with 75 foot lbs. (10.4 Kg/m, 8.5 N/m) of torque.After filter has been re-assembled to engine, the point atthe gasket and other line connections should be checkedwith soap suds, with fuel turned on, to be sure there areno leaks.Fig. 111 - Element AssemblyKEROSENE OPERATIONEfficient engine performance will be obtained only whenthe following changes are accomplished:1.A low compression cylinder head is required formodels 23, 23A, 23C, 23D, 131400, 231000, 233000,and 243000. Other models may use two cylinder headgaskets.2.A special spark plug - #291835 - must be used onmodels 23C, 23D, 233000, and 243000. Spark plug gap.030" all models.3.A reduced breaker gap .015 is used on models23C, 23D, 233000 and 243000. The engine must beretimed using the reduced breaker gap. Follow timingprocedure in Ignition Section.Power loss will vary between 15% to 25% and fuelconsumption will be approximately 15% less whilerunning on kerosene.Fig. 112 through Fig. 115 illustrates various types ofBriggs & Stratton combination fuel systems used.Due to the low volatility of kerosene, engines operatedon kerosene-gasoline fuel systems can be started onkerosene only when the engine is at operatingtemperature. Cold engines must be started on gasoline,and switched over to kerosene operation only afterwarmed up.After warm-up and while operating on kerosene, adjustcarburetor needle valves to a point where engine runssmoothest, and accelerates without hesitation whenthrottle is quickly opened. When shutting down engine,the carburetor must be emptied of kerosene so theengine can be started on gasoline when cold. Refer toFlo-Jet Carburetor for adjustment of carburetor andadjust carburetor while running on kerosene.Fig. 112 - Combination Fuel TankFig. 113A - Combination Fuel TankFig. 113B - Combination Fuel Tank, Carburetor32
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