Disassembly/Inspection and Service 2. Lay a rag or shop towel on table of drill press and place lifter, open end up, on towel. 3. Lower chucked push rod until it contacts plunger in lifter. Slowly pump plunger two or three times to force oil out of feed hole in side of lifter. 1. Remove screws, rocker arms pivots and rocker arms from cylinder head(s). 2. Compress valve springs using a valve spring compressor and remove valve spring keepers. Remove compressor. 3. With keepers taken out following items can be removed. ● Valve spring retainers. ● Valve springs. ● Valve spring caps. ● Intake and exhaust valves. ● Valve stem seals (intake valve only). Disassemble Cylinder Heads NOTE:
These engines use a valve stem seal on intake and exhaust valves. Serial No. 3422000010 and lower used a seal on intake side only. Always use new seals when valves are removed from cylinder head. Replace seals if they are deteriorated or damaged in any way. Never reuse an old seal. 4. Repeat above procedure for other cylinder head. Do not interchange parts from 1 cylinder head to other. Inspection and Service Valve Details 50 KohlerEngines.com 66 690 01 Rev. C EXHAUST VALVE INTAKE VALVE F F E C B A E D G EXHAUST G INSERT H H D INTAKE INSERT B A Dimension Intake Exhaust A Seat Angle 89° 89° B Insert O.D.
36.987/37.013 mm (1.4562/1.4572 in.) 32.987/33.013 mm (1.2987/1.2997 in.) C Guide Depth 4 mm (0.1575 in.) 6.5 mm (0.2559 in.) D Guide I.D. 7.038/7.058 mm (0.2771/0.2779 in.) 7.038/7.058 mm (0.2771/0.2779 in.) E Valve Head Diameter 33.37/33.63 mm (1.3138/1.3240 in.) 29.37/29.63 mm (1.1563/1.1665 in.) F Valve Face Angle 45° 45° G Valve Margin (Min.) 1.5 mm (0.0591 in.) 1.5 mm (0.0591 in.) H Valve Stem Diameter 6.982/7.000 mm (0.2749/0.2756 in.) 6.970/6.988 mm (0.2744/0.2751 in.)