Technician's advice sought: Terrible smoke even after stem seal replacement!
Hi guys, newbie here.....
I have a '95 4.0 litre NF Fairlane with 310,000 km on the clock. Its duel-fuel and regularly serviced.
6 months ago I put a reconditioned head on it and a month or so ago it began blowing smoke soon after start-up, as I drove away from home each morning.
So I took it back to the head reconditioner and he (free of charge) replaced all of the valve stem seals.
It still blew smoke, only after it has sat for 8-10 hours or more, in fact a month later it seems worse than ever now, actually quite embarrassing in fact!
I did a compression check on it a few days ago and it returned pretty good figures (considering the motor's age) of 180-195psi across all six cylinders. This represents a variation of less than 8%, quite acceptable I think.
So it seems that the compression rings, at least, are ok. Is there a check for oil rings?
As a matter of interest, No.4 spark plug was darker than the others, with oil residue around the base of the thread, so it seems its the problem.
NB: The car doesn't blow any visible smoke after it has been running for about 30-40 seconds, under acceleration or deceleration. It only blows smoke when its cold.
What is wrong with my car? I am tearing my hair out (what's left of it!) over this!