Bro if engine rebuild is the only / last solution, then why waste time, money and efforts on short cuts, quick fixes, etc.?
I would sincerely suggest to visit Babar Bhai's shop in Hyderabad and have your issue fixed, once and for all. Otherwise, if you will be going for short cuts / quick fixes, they may work for some time, but then ultimately, they will cost you much more, and may result in damage(s) of other items too.