I swapped khyber engine with vitz 1szfe 1.0L with auto transmission.
No oil or water reduced.
But from day one, engine is giving rattling sound. Its video of sound is here
Mechanic say it is due to timing chain, due to engine are kept in shop for long duration, and will go off by the time. I am not convinced, so help me in
1. Identify the problem
2. Possible solution
3. Estimated cost
4. Any recommendation
Thanks