hi all . ever since i have had my cylinder overhauled my car puffs blue smoke on overrun and after it has been idling for a while . it did not do it before and the head gasket was not gone ., i just did it as a matter of course as i am fussy . the car has done 46000 miles and i change the oil every 1000 miles using motul 300v 15 50.. the only thing i have changed when rebuilding is i have fitted arp head bolts and fitted a bailey tubo feed pipe and filter . as i am a mechanic smoking in this way is usally to do with valve seals . but i have been back to engineers who did the head and they said they had no problems. what i did notice when the head was being done i noticed all the valves were just put in a tin so i dont think they were put back in there original places , which too me is bad practice . as you can guess i am not very happy about this and dont really want too remove the head again but it dont look good smoking like this and it needs to be repaired . could the turbo suddenley have started to leak oil or could it be the feed pipe ... any other ideas kind regards mark freestone

 

The valves are made on the same machines to the same dimensions, so stems are the same size, as they have recut the seats(?) the mix up is not really important as they all have new seats etc to wear to.
So long as they have not forgotten the stem seals, it will not be coming from here.
Look in the inlet pipe between intercooler and throttle housing to see if there is any oil there.
Also check your PCV are clear, turbo's can sudenly go but could also be a bit of residual oil in ports used to lubs valves burning off though should stop very quickly.
There is no need to do 1000 mile oil changes at all, btw.
tabetha

 

yes i know but it is good practice to put things back from where they were removed as they wear together . i have cecked the turbo hoses and there is no sign of any oil . the car smokes quite heavily on a downhill gradient with no throttle on until you get to the bottom then you get the puff of blue smoke which aint good and it did not do it before . what i will do is pull the cams out and lift the followers and look between the springs to see if any seals are missing or dislogded. i just hoped threr might be something silly which is a common problem after doing the head

 

the valve guides were not changed

 

NO wear should have occured on the valves or they should be replaced anyway as made of HIGH TENSILE STEEL, with SODIUM in the exhaust valves due to heat, a very soft metal with a low melting point of 98C, that flows back and forth as valve rises and falls thus cooling it, though you most likely know this anyway.
Keeping the valves in order is a bit old hat with the modern materials, certainly on this engine, as the valves guides are a MATCHED material spec for lubricity reasons.
The guides should not have neede replacing at 46,000 miles anyway, unless not been looked after.
tabetha

 

ok then as it did not smoke before , what do you think is the problem because the way the car smokes it looks like it has done 146 000 miles not 46 000 miles and i am imbarrased to drive it .

 

If it did not smoke before as you say, and there is no oil in the inlet tract, then that only leaves a few places.
I think your suspicions about th head arew wrong or certainly should be, if it is a decent machine shop ?.
I know it does sound like the valve stems/seals, bnut as they were not worn before can't see how they could be now ?
I would change the oil first and for a differnt brand such as SILKOLENE 1PRO S 15/50.
What torque setting did you use for the head ?
I know when my machine shop does heads they use a marker on the valves and then bung them in a container.
It is not beyond the realms of possibility that they have forgotten the stem seals, but if it had leaky valves before(most do) then it will develop more vacuum at overun and be much more likley to drag oil now than before into chamber, FROM ANYWHERE it can suck on.
Is it std what breather are you using ?
tabetha

 

hi i have used motul for many years now with no problem i torqued the head down as per burtons instructions i think it was 95 ib ft . like i said there is no oil in the turbo pipes but i have found some in the plenium chamber . so i am now inspecting the standard breather system . the car is totally standard running standard boost pressure . there is a valve by the mapp sensor on the inner wing . i have tested this in the workshop and it appears to be ok but yet to see if it works on the car ,. do you know if it operates as soon as ignition is turned on or does it power up when required by the ecu .

 

this valve is connected to the kidney box and plenium chamber via a t piece it it comes from the chamber via a vacuum pipe through a 1 way valve then to the electronic valve mentioned above , it then goes inside the passenger front wing into a carbon cannister i presume. until this valve is powered up you cannott suck through the pipe . but when you apply 12 volts you can suck through quite easily.

 

hi all it was the valve seals for some reason 4 had lifted off the top of the valve guide . these were aftermarket seals so now i have ordered genuine ford items. has anyone suffered the same problem