ASTM D2700:19 pdf download

ASTM D2700:2019 pdf download.Standard Test Method for Motor Octane Number of Spark-lgnition Engine Fuel.
10.3.15.1 Basic Rocker-Arm Carrier Support Setting—For exposed valve train applications, each rocker arm carrier support shall be threaded into the cylinder so that the distance between the machined surface of the cylinder and the underside of the fork is 3 1 mm (1 ti in.). For enclosed valve train applications, each rocker arm carrier support shall be threaded into the cylinder so that the distance between the top machined surface of the valve tray and the underside of the fork is 19 mm (¾ in.).
10.3.15.2 Basic Rocker Arm carrier Setting—With the cylinder positioned so that the distance between the underside of the cylinder and the top of the clamping sleeve is approximately 16 mm (in.), the rocker arm carrier shall be set horizontal before tightening the bolts that fasten the long carrier support to the clamping sleeve.
10.3.15.3 Basic Rocker Au,, Setting—With the engine on tdc on the compression stroke, and the rocker arm carrier set at the basic setting, set the valve adjusting screw to approximately the mid-position in each rocker arm. Then adjust the length of the push rods so that the rocker arms shall be in the horizontal position.
10.3. 16 Basic Spark Setting—26° btdc at a critical cylinder height, uncompensated for barometric pressure and indicated as a digital counter reading of 264 or a dial indicator reading of 0.825 in.
10.3.16.1 The digital timing indicator currently supplied with CFR engine unils, or the graduated spark quadran formerly supplied, shall he in proper working order and calibrated so that the time of ignition is correctly displayed with reference to the engine crankshaft.
10.3.16.2 Basic Ignition Timer control Arm Setting—Adjust and set the length of the ignition control rod so that the centerline of the ignition control arm shall be horizontal at the specified cylinder height uncompensated for barometric pressure.
10.3.16.3 Ignition Timer Basic Transducer to Rotor Vane Gap Seuing—0.08 mm to 0. 13 mm (0.003 in. to 0.005 in.).
10.3.16.4 Basic Spark Setting—With the engine running and firing, position the ignition timer in the ignition timer control arm so that ignition occurs at 26° btdc as displayed on the digital timing indicator or spark quadrant. Tighten the control arm knurled clamping screw.
10.3. 16.5 Automatic change Spark Thning Adjustment—As cylinder height is adjusted during the determination of O.N., the spark timing is automatically changed and shall provide the characteristic given in Table 3.
10.3.17 Spark Plug—Champion D16, or equivalent.
10.3.17.1 Gap—O.51 mm ± 0.13 mm.
10.3.18 Basic Cylinder Height Setting—Thoroughly warm up the engine under essentially standard operating conditions. Shut the unit down, and check that the ignition is turned off and fuel cannot enter the combustion chamber. Install a calibrated compression pressure gauge assembly on the engine, motor the engine, and adjust the cylinder height so that the unit produces.