Failure Diagnosis; Cylinder Block - KEEWAY F-ACT EVO Instruction & Maintenance Manual

external diameter of piston pin
Clearance between piston pin hole and piston pin
Inside diameter of wrist-pin end of connecting rod

13.2 Failure diagnosis

Low compression pressure
Piston is worn; burnt or broken
Cylinder and piston is worn or damaged
Gasket is damaged;
Over-high compression pressure
Too much carbon deposits in combustion chamber damage of cylinder, piston and piston ring
wear of piston pin hole and piston pin

13.3 Cylinder block

13.3.1Disassembly of cylinder block
To take out the cylinder block after the disassembly of
cylinder head.
Checking of cylinder block
13.3.2
Check the wear of inside wall of cylinder
If it is badly worn, it should be replaced.
Check the flatness of cylinder block and cylinder
surface
Allowable limits: 0.05
inside diameter of piston pin hole
Smoking on the exhaust pipe
The piston ring is worn or damaged
Piston and cylinder is worn or damaged
Air leakage existed between the crankcase and cylinder
Abnormal sound of piston
Ruler
- 125 -
12.002-12.008
11.994-12
0.002-0.014
14.016-14.034
Cylinder
block
Test ruler
12.04
11.96
0.02
14.06
Cylinder
block