Question

In forced feed system of lubrication, the connecting rod bearings are lubricated through the ___________drilled holes in

(a) Crank shaft

(b) Cam shaft

(c) Connecting rod

(d) Crank case

I had been asked this question in exam.

Question is taken from Principles of Forced Feed System topic in section Lubrication System and Tractor’s Classification of Farm Machinery

Answer 1

Right option is (a) Crank shaft

For explanation I would say: Usually the oil first enters the main gallery which could be a pipe or channel, present in the crankcase casting. From the pipe, it goes to each of the main bearings through holes. From main bearings, it goes to big end bearing