SAMPLING LOCATION

The criteria used in selecting the overhaul and experimental work area are mostly selected by availability of experimentation features, and such work area shall include the following: I) the proximity to industrial area, ii) accessibility to good mechanical workshop, iii) availability of measuring instruments and iv) other tools that could be used to produced good technical performance of the project activities.

EXPERIMENTAL WORK:
The experiment was performed by assembling of engine in the workshop and carrying out overhaul on G399 caterpillar engine or G3512 engine and the following series of test and inspection were conducted.
i)    Carrying out coupling alignment.
ii)   Carrying out component metro-logical analysis of data.
iii)  Carrying out material quality inspection.
iv)  Carrying out optimization of activities.
v)   Carrying out pressure testing of top cylinders and valves.
vii) Carrying out hydro-testing or pressure testing of heat exchanger and oil cooler.

COUPLING ALIGNMENT:
The specimens for the alignment were the coupling of the driving shaft of the engine and the gearbox  driving shaft.It was subjected to axial torque and load on rotation in-conjunction with the flywheel of the engine,.The torque and the speed were conformed with the requirement of the engine and gearbox specification, depending on the type of coupling.The process involved knowledge of the allowable tolerance range of the manufacturer and the designer specification.