Crankshaft (Disassembled Engine) - Rotax 2005 717 RFI Engine Shop Manual

Section 01 ENGINE MEASUREMENT
Subsection 01 (MEASUREMENT PROCEDURES)
1
3
F01D4IA
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 crank-
shaft.
Crankshaft Alignment at Connecting
Rod Journal
Counterweights can also be twisted on connect-
ing rod journal on any or both cylinder(s).
6
2
4
1. Connecting rod journal alignment here
Such misalignment may make it difficult to manu-
ally turn the crankshaft. Verification can be done
by measuring deflection each end of crankshaft.
If deflection is found greater than specified toler-
ance, this indicates worn bearing(s), bent and/or
misaligned crankshaft. Proceed with the disas-
sembly of the engine.
CRANKSHAFT (DISASSEMBLED
ENGINE)
The following verifications can be performed with
the engine disassembled.
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.
1. Ruler must be aligned with edge of connecting rod here
2. Align ruler here
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