Di ko po alam kung tama itong pag post ko pero I really wish that you geniuses could advise me what to do.
My ride is an import Pajero, boxtype, 4d56 engine. Newly overhauled po so within breakin period pa. My problems are:

1) im hearing a knocking sound coming from the engine compartment;

What did your mechanic have to say about this? He will be in the best position to advise you as he overhauled your engine.

2) i know its just the break in period, but when I took the SCTEX going to manila from zambales... my ride was having a hard time climbing the not so steep inclines thereat.

Did you have your fuel injection system serviced while the engine was being overhauled?

My dad (which has a bit more experience with diesel engines than me) said that it is fuel knock.

He could be right.

My ride already has this problem before it was overhauled. I just want to fix the problems of my ride 1 by 1 so that it would eTentually be fantastic.

There was no improvement after the overhaul?

PS: I read in one of the threads that "petron power booster" is good in reducing if not totally eliminating the knocking sound... so please can anyone advice me on all of the above.

Petron power booster can help. But this is masking the problem, not fixing the problem. A good engine should run well without aid from any additives.

Thanks in advance

You're welcome....