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SERVICE DIAGNOSTIC OVERVIEW A logical, planned approach can move service work through a repair center in a smooth and efficient manner. Fueled by information from a thorough Quick Check, the nature of the repair work required can be quickly established. Once the problem is established as an engine issue, the process continues through a system of checks or tests until the affected engine system is determined. A skilled technician will accurately establish the symptoms of the problem and drill down to the root cause such as those listed in the tables below. See the diagram and flowchart. Failure Table #1 Fuel Supply : • No Fuel in Tank • Fuel Shut-Off Valve • Kinked Fuel Line • Fuel Filter, Restricted • Fuel Level Low • Fuel Tank Mounting Low • Fuel Pump Fuel Solenoid • Vapor Lock. Failure Table #2 Under Choke : • Choke Cable • Choke Control Cable • Choke Linkage • Choke Shaft • Inoperative Choke Plate • Manifold Gasket • No Human Intervention. Failure Table #3 Primer : • Primer Bulb • Check Valve • Primer Line • Backing Plate Gasket • Restricted, Passage • No Human Intervention • Manifold Gasket. Failure Table #4 : Over Choke • Choke Cable • Choke Control Cable • Choke Linkage • Choke Shaft • No Human Intervention • Air Cleaner, Restricted • Air Intake, Restricted • Bi-Metal Choke Spring • Automatic Choke. Air Cleaner Manifold : Problems involving the air cleaner manifold are normally related to loose mounting screws and/or damaged or leaking gaskets. Air Cleaner, Restricted : Restricted air filter elements effect engine operation differently based on the carburetor venting system. Air Intake, Restricted : See A/C, restricted : The automatic choke function of the Pulsa-Jet carburetor used on vertical crankshaft lawnmower style engines can cause an overly rich condition during starting and operation. The default choke position is on. Backing Plate Gasket : A leak in an air cleaner backing gasket means, among other things, that unmetered air is entering the engine and leaning out the fuel mixture. Check Valve : Pulsa-prime carburetors. This wet bulb primer incorporates a check valve in the priming circuit that allows fuel to fill the bulb via the fuel supply but closes when the bulb is depressed.
Tags : style engines, manifold problems, filter elements, tank fuel, skilled technician, vapor lock, pump fuel, control cable, fuel level, human intervention, fuel supply, fuel line, air cleaner, fuel tank, check valve
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