|Leaky valve stem seals
: MY 2001 Toyota Camry emits black exhaust
smoke when first started in the morning but
clears up soon after and remains clear for the
rest of the day.
What is the likely cause of this and is there
anything that can be done to prevent this?
IT is likely that the valve stem oil seals are worn
and require replacing.
The symptoms that you describe are typical.
Oil drips down the valve stems, past the seals
when the vehicle is at a standstill, or under
heavy acceleration when the pressure in the
inlet tract is low.
The cylinder head must be removed from the
vehicle in order to gain access to the valve seals.
Considering the amount of work involved, it
is more economical to carry out a complete
cylinder head overhaul at the same time.