correct me please to understand right:
- car is lahore registered & used in islamabad / rawalpindi for which you are planning an engine swap
- the engine your buying is in yard at rawalpindi
if above 2 are YES - please read below
the yard engine you can select write down the number make an advance deposit on condition that if engine is clear from excise office and does not appear in excise or 15 database as stolen or already registered to a vehicle ( get a print out either way it will help for endorsement ) you will collect on balance payment or else deposit will be returned. The yard guy may ask for print out of your claim for non-clearance before he refund. what if you changed your mind and bluffing to seek refund.
If the verbal OK clear is given by 15 & excise. buy the engine with receipt mentioning engine CC and brand [ 4500 CC Komatsu etc etc ] so that same engine capacity is endorsed on your book that will help in paying taxes etc.
do not buy engine if it is in excise / 15 database to a registered vehicle. You will not be able to get an endorsement to your regn book.