717 Engines

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F01D4IA 1 3 TYPICAL 1. TDC gauge 2. Degree wheel 3. Hand tighten nut 4. Needle pointer – Remove TDC gauge and install on PTO side. – Bring PTO piston at Top Dead Center. Interval between cylinders must be exactly 180° therefore, needle pointer must indicate 180° on degree wheel (360° -180°= 180°). Any other reading indicates a misaligned crankshaft. CrankshaftAlignmentatConnecting Rod Journal Counterweights can also be twisted on connecting rod journal on any or both cylinder(s). 2 4 F01D1NB Section 04 ENGINE (2-STROKE) Subsection 05 (BOTTOM END) 1. Connecting rod journal alignment here 1 Such misalignment may make it difficult to manually turn the crankshaft. Verification can be done by measuring deflection each end of crankshaft. If deflection is found greater than specified tolerance, this indicates worn bearing(s), bent and/or disaligned crankshaft. Proceed with the disassembly of the engine. Disassembled Engine The following verifications can be performed with theenginedisassembled. Crankcase Inspect plane surfaces for warpage. Small deformation can be corrected by grinding surface with a fine sandpaper. Install sandpaper on a surface plate and rub part against oiled sand paper. Bearing Inspect crankshaft bearings no. 4. Check for corrosion, scoring, pitting, chipping or other evidence of wear. Make sure plastic cage is not melted. Rotate and make sure they turn smoothly. Crankshaft NOTE: If crankshaft and/or components are found defective, it must be repaired by a specialized shop or replaced. Connecting Rod Straightness Align a steel ruler on edge of small end connecting rod bore. Check if ruler is perfectly aligned with edge of big end. smr2004-Complete Line Up 141
Section 04 ENGINE (2-STROKE) Subsection 05 (BOTTOM END) F01D1QA 1. Ruler must be aligned with edge of connecting rod here 2. Align ruler here Crankshaft Deflection All Models MEASUREMENT MAG SIDE PTO SIDE Crankshaft deflection (max.) 2 0.050 mm (.002 in) 1 0.030 mm (.001 in) Crankshaft deflection is measured each end with a dial indicator. First, check deflection with crankshaft in crankcase. If deflection exceeds the specified tolerance, it can be either ball bearings wear, bent or twisted crankshaft at connecting rod journal. F01D1SA 1. Measuring PTO side deflection in crankcase 1 F01D1TA 1 1. Measuring MAG side deflection in crankcase Remove crankshaft bearings and check deflection again on V-shaped blocks as illustrated. F01D97A 1 1. Measuring MAG side deflection on V-shaped blocks F01D98A 1. Measuring PTO side deflection on V-shaped blocks 142 smr2004-Complete Line Up 1
Page 1 and 2: TOP END 717 Engines Molykote 111 F1
Page 3 and 4: 947 DI Engines 26 10 N•m (89 lbf
Page 5 and 6: 2 3 1 F06D16B RAVE VALVE CLOSED 1.
Page 7 and 8: F06D0QA 1 1. Remove screws Remove R
Page 9 and 10: F06D28A 1. Remove O-ring 1 Remove s
Page 11 and 12: Remove cylinder head no. 2. If shel
Page 13 and 14: F00B0KA 1 1. Tool cut-out toward bo
Page 15 and 16: A F01D8AA 2 1. Measuring perpendicu
Page 17 and 18: F00B09A 2 1. Use the micrometer to
Page 19 and 20: F01D8KA 1 3 2 1. Sliding valve 2. O
Page 21 and 22: - Replace the inner halves by the a
Page 23 and 24: 947 DI Engines Securecirclipinpisto
Page 25 and 26: F01D45A 717 ENGINES 1. Aligning cyl
Page 27 and 28: Apply Molykote 111 on threads of cy
Page 29 and 30: Compare the obtained value with the
Page 31 and 32: Section 04 ENGINE (2-STROKE) Subsec
Page 41: Section 04 ENGINE (2-STROKE) Subsec

717 Engines

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