Hello guys. what i did to my 4tech engine is i took it off from the car, cleaned the outside with WD40 then placed it back and then tried to start it. went pretty fine but after few minutes, smoke appeared from the engine (not from the exhaust). removed the blue part of the the engine (i dont know what is the exact term, cooling system) to the check the piston and glow plug as well and everything seems fine. my question is, is the smoke came from wd40 which i used to clean the outside of the engine due to heat after running or is my engine broken? please help. really bothered with my car.