Quantcast b.  Idle Speed Adjustment

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TM 9-2815-225-34&P 3-93.  ON-ENGINE FUEL PUMP ADJUSTMENT (Contd) LOCATION/ITEM ACTION REMARKS a.  Preadjustment Checks (Contd) NOTE   Vehicle fuel control lever and throttle stop linkage should have a maximum throttle stop, so when fuel pump full throttle is obtained, override pressure will not be on throttle shaft.   When fuel pump has been properly calibrated, very little adjustment should be required after installation on engine except idle, since this setting is dependent on parasitic loads. Fine adjustment of governor settings and fuel manifold pressure is permissible within the limits specified if justified by engine performance tests. 1.   Throttle control linkage Check and adjust for: Refer to TM 9-2320-283-34 or TM 9-2320-273-34. a.  Full throttle operation. b.  Throttle released operation with throttle stopped by throttle leakage adjusting screw. b.  Idle Speed Adjustment NOTE Idle speed adjustment should never be made on a cold engine.  Engine must be operated a sufficient period of time to purge all air from the fuel system and to bring the engine up to operating temperature (at least 165°F (74°C) oil temperature). 2.   Spring pack cover (9) Remove plug (7). 3.   Engine (1) Start.   Engine (1) mounted to dynamome- ter (2). 4. Idle adjusting screw (16) Adjust while engine (1) is Turn idle adjusting screw (16) running.  Use idle adjusting tool in to increase engine (1) rpm; (4) to set idle to 600 ± 2 rpm. out to decrease rpm.  Fuel pump idle adjusting tool (3375981) (4) will not let the spring pack cover (9) leak when the idle is adjusted. 5.   Spring pack cover (9) Install plug (7). c.  High Speed Adjustment NOTE A means of loading the engine must be used to perform this check.  The tachometer and fuel manifold pressure gauge must be of high accuracy.  The engine fuel system must be purged  of  all  air  and  at  operating  temperature.    If  spring  pack  cover  is  opened  to  make adjustment,  fuel  pump  must  be  purged  of  air  before  attempting  cutoff  setting  adjustment. The preferred method of loading engine is on an engine or chassis dynamometer. 6.   Spring pack cover (9), three Remove from fuel pump captive washer screws (6), assembly (3). screw (8), and four washers (5) 7.   Fuel pump gasket (10) Remove. Discard gasket (10). 8.   Snapring (11) Remove. Use snapring pliers. 3-692


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