Performance of a Fire-pump has deteriorated and is not developing required head. Describe the following:

(a) The procedure for dismantling the pump. (4)

(b) The likely defects and remedial measures to be taken. (3)

(c) Clearances to be checked. (3)

(d) Precautions during assembly. (3)

(e) Checks for alignment of motor pump coupling. (3)