SERVICE MANUALCYLINDER HEAD & VALVESSection 32.Turn the engine forward to approximately BDC(Bottom Dead Center).3.Place a 0.10 mm (.004 in.) feeler gauge betweenthe valve lever and valve stem of the No. 1intake valve and slowly rotate the engine forwarduntil the feeler gauge becomes tight. This is nowthe point at which the No. 1 intake valve startsto open before top dead center. The followingdegree readings should be read on eithervibration damper or flywheel depending on theapplication.EnginesReadingsD-312 Below Eng. S/N 250530 ± 3D-312 Eng. S/N 2505 and23 ±3AboveD-360 and DT-36030 ± 3All 400 Series Engines24° ± 3NOTE: One (1) tooth "out of time" on gear trainequals approximately 11 degrees movement ofvibration damper.NOTE: If the timing on the No. 1 valve is withinspecifications, the other valves barring extremecamshaft lobe wear or poor adjustment will also bein time.4.Readjust the No. 1 intake valve to its properlash as described in this section.5.If timing is found to be incorrect, removal of theengine's front cover is required to inspect punchmark and gear tooth position. Figure 39 depictsa properly timed assembly and number of teethbetween marks..Crankshaft Gear2.Idler Gear3.Camshaft GearUTDS*4.Injection Pump Drive Gear Model 1005.Tachometer Drive Gear Fuel Injection(if equipped)Robert Bosch6. Injection Pump Fuel InjectionDrive GearModel MWFigure 39. - Properly Timed GearTrain Assembly22.5TEETH BETWEEN PUNCHMARK 1 AND PUNCH MARK 2.CG-9885*United Technologies Diesel Systems (formerly AMBAC)CGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 32
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