Mk 5 Valve guide seal replacement

[oldsaltoz]

My Mk5 2.5 turbo drops some smoke after idling at the lights , can the valve guide seals be replaced without removing the head, perhaps compreesd air in the cyclinders would help

Anyone done this

[transitgeoff]

unusual for it to be stemseals on a DI,sure its that

[MrMPuk]

When you say some smoke, how much? A turbo that has idled for a while then revved will smoke a bit.

[AndyG]

When you say some smoke, how much? A turbo that has idled for a while then revved will smoke a bit.

I agree a puff of smoke when pulling away from idling is normal on a turbo cause the turbo has't 'come on line yet' and while it's playing catch up the fuel is slightly rich until then.
Can anybody else explain it better

[stevew]

That shouldn't happen. The inlet manifold pressure sensor is supposed to allow the ECU to deliver the appropriate amount of fuel for the level of boost.

Steve

[AndyG]

That shouldn't happen. The inlet manifold pressure sensor is supposed to allow the ECU to deliver the appropriate amount of fuel for the level of boost.

Steve

I agree with you But that's what happens

[stevew]

Yep, nothings perfect!

It could be oil that's leaked past the seals in the turbo. Depends on the smoke colour.

Steve

[madmark]

turbo ,di,s dont do that! will be a fuel /pump prblem or injectors, or turbo unless you have done star treck mileage!

[oldsaltoz]

The smoke is blue (burnt oil) and is given off as I move on, by the time I change to the next gear it has stopped.(I use second to move off unless I'm on a hill).

If I give the engine a rev in neutral after idling for a couple of minutes it puts out a burst of blue smoke. no sign of any smoke of any colour after she gets going. and no smoke if I rev it as soon as I stop. It was doing this before and after the dreaded epic pump was overhauled, so I doubt that's the cause, and in any case the smoke is blue not black, as would be the case if were too much fuel I think.

210K on the clock but only 30k since new head was fitted along with new pistons, rings, and bearings including mains, also all new hoses and timing belt, and a new clutch plate.

So, can the seals be worked on without removing the head

Avagoodweekend......

[MrMPuk]

Yes but as Geoff has said doubtful it's them.

[madmark]

mate you would be supriesed on a diesel to much fuel is bluey white not black, some turbo,s when you first start them in the morning do a few puffs of bluey white then it clears!
yes the simptoms you have are what would be on a petrol but would be supriesed on a di turbo!

[100ps_drw_hicube]

i reckon turbo seals we changed the turbo on our blue van once and it cured blue smoke on start up and pulling away from stop

[gemini]

if the valve seals are leaking you will see a big puff of smoke when you first start it in a morning from the oil that has run down into the bores overnight

[stevew]

Like I said it could be the turbo oil seals. Check the inlet manifold for copious amounts of oil!
To be honest mine is totally covered in black gunk but it's still going OK so I'm leaving well alone. If your van hasn't failed the MOT and isn't using loads of oil I wouldn't worry about it too much.

Steve