Thanks. I'll have the valves checked. It does have a knocking noise (tok tok) similar to a typewriter but hardly noticeable unless you listen closely. Howcome the mechanic didn't suspect the valves? You guys think I should look for another mechanic? He said it could be due to the cracked transmission, although I know for a fact that it is cracked, I have a suspicion that it is not the cause of the noisy engine. I ran in on idle a while ago and I felt like I was inside an old diesel car (like my lolo's old gemini)

Is the valve adjustment a major repair? Are there any parts that I have to replace?