OMRG25204 oem uncert & tier 1.pdf - John Deere Industrial Engines

Lubrication & Maint./2000 Hour/24 MonthCheck and Adjust Valve ClearanceCAUTION: To prevent accidental starting ofengine while performing valve adjustments,always disconnect NEGATIVE (—) batteryterminal.IMPORTANT: Valve clearance MUST BE checked andadjusted with engine COLD.1. Remove rocker arm cover and crankcase ventilatortube.Flywheel Housing Timing HolesRG7408 –UN–06AUG96IMPORTANT: Visually inspect contact surfaces ofvalve tips and rocker arm wear pads.Check all parts for excessive wear,breakage, or cracks. Replace parts thatshow visible damage.Rocker arms that exhibit excessivevalve clearance should be inspectedmore thoroughly to identify damagedparts.2. Remove plastic plugs or cover plate from enginetiming/rotation hole (A) and timing pin hole (B).NOTE: Some engines are equipped with flywheelhousings which do not allow use of an engineflywheel rotation tool. These engines may berotated from front nose of engine, using JDG966Crankshaft Front/Rear Rotation Adapter.3. Using JDE83 or JD81-1 Flywheel Turning Tool, rotateengine flywheel in running direction (clockwise viewedfrom front) until No. 1 cylinder is at TDC compressionstroke. Insert JDG1571 or JDE81-4 Timing Pin inflywheel.If No.1 cylinder rocker arms are loose, the engine is atNo. 1 TDC compression.If No. 1 cylinder rocker arms are not loose, rotateengine one full revolution (360°) toNo.1TDCcompression.A—Timing/Rotation HoleB—Timing Pin HoleContinued on next pageDPSG,RG41165,137–19–16JAN02–1/540-10 110306PN=103