ENGINE DIAGNOSTIC TEST PROCEDURESSection 6•EXHAUST BACK PRESSURE- 400 Series On-Highway(with Robert Bosch MW Pumps)FROM FORM NO. CGED-365EXHAUST BACK PRESSURE14A.MEASURE AT POINT 3 TO 6 IN. AFTER ELBOW OR STRAIGHT PIPEEXHAUST EXTENSION FLANGE.B.MEASURE AT FULL LOAD & RATED SPEED.INSTRUMENTGUIDELINEDATA‚1st CHECK2nd CHECKWATER MANOMETEROR MAGNAHELICGAUGEpRefer to "Performance Data Guidelines", in this section.Measure exhaust back pressure as follows:1.Connect pressure test kit (SE-2239) in a straightsection of exhaust pipe approximately 3 to 6 inchesafter the turbocharger exhaust elbow extensionflange, as shown in Figure 28 or 3 to 6 inches afterthe turbocharger straight pipe exhaust extensionflange, as shown in Figure 29.Figure 28. Exhaust Back Pressure TestLocation with Exhaust ElbowFigure 29. Exhaust Back Pressure TestLocation with Straight Exhaust Pipe2.Obtain the data at rated speed and normal operatingtemperatures on the chassis dynamometer or fullyloaded on the highway. Specifications as noted inthe Performance Data Guidelines in Section 6 are 0-6.7 kPa (0-27 in H20.3.If pressure exceeds guidelines, reduce restriction byreplacing muffler or exhaust piping as required.CGES-240-4Printed in United States of AmericaPage 38
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