717 Engines

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