Tomberlin CrossFire 150, Service Manual

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CRANKSHAFT INSPECTION
CONNECTING ROD SIDE CLEARANCE:
• Measure connecting rod big end side clearance with a feeler gauge.
• Compare to specifi cations.
• If the clearance is greater than service limit the crankshaft assembly must be replaced.
Service limit 0.55 mm 0.022 in.
CONNECTING ROD RADIAL CLEARANCE:
• Rotate rod on crankshaft and check for rough spots.
• Check radial end play in rod by securing crankshaft in a holding fi xture such as a vice.
• Set up a dial indicator as shown in Figure 1.
• Support connecting rod against one side of crank shaft and apply up and down pressure on connecting rod.
• Read total movement of indicator and compare to specifi cations.
• Replace crankshaft if clearance is excessive.
Service limit 0.05 mm 0.002 in.
MEASURING THE RUNOUT OF THE CRANKSHAFT:
• Support crankshaft with V-blocks.
• Setup up dial indicator on end of crankshaft.
• Rotate crankshaft and measure runout.
• Runout must be less than 0.10 mm 0.004 in.
Service limit 0.10mm 0.004 in.
WARNING
A crank runout that is too large will cause abnormal engine shaking and can potentially damage the life of the
engine. Because this is an important factor in proper engine operation, examine the runout carefully.
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