KEEWAY F-ACT EVO - Speed Reducer System; 15. Speed Reducer; 15.2 Fault Diagnosis

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16. Crankcase
Preparation Data-----------------16.1
Fault Analysis-----------------16.2
Crankcase -------------------16.3
Assembly---------------------16.4
16.1 Preparation Data
Attentions to operation:
The crankcase is thin-wall casting and should be prevented from impact to produce distortion or rupture.
All components should be cleaned before examination and test and blew clean with pressure air.
Before operation, please release lubricant oil from the crankcase.
Effect of crankcase: The crankcase is the force bearing component for engine. Its main role is to support
crankshaft, clutch, gearbox, cylinder block and cylinder head and bear the burn outbreak impact and the inertial
force of crank linkage motion and form some closed space (airproof to oil and gas). The crankcase is also
equipped with hang hole by which to make the motor connect with car frame and other parts.
Preparation Datum Unit：mm
Item
Standard Value
Allowed Limit
Crank Axle
Clearance between both big ends of the
connection rod
0.25-0.40
0.55
Radial clearance between big end of the
connection rod
0.015-0.025
0.05
Tool
Universal Holder Clutch Spring Compressor
Screwdriver Rod Jacket Wrenches
Guide Bar Bearing Screwdriver
16.2 Fault Analysis
There is some odd voice inside the crankcase.
There are components scattered or broken inside the crankcase. The crankshaft bearing is loose.
The crank pin bearing is loose. The clutch is stuck.