W

welshspringer

Active Member
Hi
Have completed the rebuild of my (1996) disco, new boot floor, new rear side wings and new sills. Everything else works incl all switches. Problem, when on start up and engine is controling downward motion (live on a big hill) there is evidence of blueish smoke until acelerator is pressed when the smoke disapears. Only happens when not acelerating. Any clues please, does not use oil, engine has done 155k.
Seeing all panels renewed (not patched) would anyone have an idea of value. For year it looks very good, a good polish would help.
 
Please Help!

I mentioned in an earlier post that I have blue smoke evident, I realise it is oil but the reason has me baffled, did have one person say could be overfuelling!
Start up NO smoke, drive off NO smoke. Procede down a slope with traffic calming, leave the motor on tick over in gear, wisps blue smoke. Down a steep hill a lot of blue smoke, depress clutch smoke disapears. This will happen for the first 10 miles of hills. Once out of the hills will not see any smoke even when accelerating hard until following daywhen the same happens.
There can be a difference, If I start my journey travelling uphill will not see any smoke at all??????
Has anyone got any idea what could be the problem. Told the mot centre about the smoke, reply no problem with emissions nor was smoke evident on test???????
 
If it uses no oil, then its not oil - that said, even the smallest amount of oil will give smoke.

There are not so many places where oil can get in to burn - rings, stem seals, head gasket (i guess) and turbo seals.

As above, are you sure its not timing and fuel? Burnt oil smells foul on the exhaust - like burning tyres. Its a distinctive enough smell.
 
Oh, one last one - the breather that meets the air inlet pre-turbo. But thats just for the sake of completion on the list!
 
Cam belt changed 2 years ago, new cylinder head last year, head gasket this year, blew radiator - my fault should have changed it sooner, matter of fact radiator was on order and I used the cat - silly me. After the new gasket I would have thought timing would be OK! Have not noticed the smell. So perhaps it could be over fuelling?
 
down hill, so not accellerating, so wont be overfulling, as is occurring on overrun, compression test , stem seals, rings, or a blocked breather, so pulling in oil rather than air
 
+ 1 on the valve stem seals, if it's using no or minimal oil not a lot to worry about, it should keep going for quite a while like that.
Relatively easy to replace with head on if you cannot live with the slight smoke.
 
disco me said:
down hill, so not accelerating, so wont be overfuelling, as is occurring on overrun, compression test , stem seals, rings, or a blocked breather, so pulling in oil rather than air
Click to expand...
I'd agree with this really - but if its been stood for a while its possible that the boost pin is stuck - unlikely, but possible. Easy check too - if its full of gunge in the top of the pump you might have found the problem.
 
Gazbo said:
+ 1 on the valve stem seals, if it's using no or minimal oil not a lot to worry about, it should keep going for quite a while like that.
Relatively easy to replace with head on if you cannot live with the slight smoke.
Click to expand...

+2 - far more likely to be valve stem seals.

But most likely cause, as others have said above, is timing IMHO.
 
Correct me if I'm wrong, but would not a stuck boost pin tend to be putting more fuel into the engine resulting in a higher than usual idle speed. This engine and injection system only has one speed control, that being fuel quantity injected.
Would not a timing error show up as a fair lack of performance and possibly starting problems?
My money would still be on valve stem seals, general, or one split seal tracking oil in.
 
I am hoping it is not a valve stem seal, only replaced last July. Apart from that thanks to everyone for advice, will have my tame mech to check the suggestions.
Just read this months Land Rover International re the D3. Makes you wonder is it wise to purchase a D3 or carry on maintaining the relatively cheap Disco1.
Body wise I should be ok for tin worm for a few years.
 
Had all the replies checked and the mech said as a previous comment -"Not using oil only evident at start up, leave alone" The mech egreed with the comment with the proviso "Why spend to chase a small problem" As mentioned after initial first few miles, NO smoke for rest of trip. Thought I'd mention on seeing smoke, dip clutch smoke stops.
 
welshspringer said:
Thought I'd mention on seeing smoke, dip clutch smoke stops.
Click to expand...
I would fit a boost gauge, and then watch it come off boost, and the smoke stop (?) as you dip the clutch - which would point me in the direction of over fueling - what's it like on fuel - I.E. MPG ???
 
Have not done a apecific check lately, I think a 50 mile run, motorway and other roads 30+. Around town guessing mid twenties, used to get on a long run 35ish. Once on a London trip had 38 actual.
 
welshspringer said:
Have not done a apecific check lately, I think a 50 mile run, motorway and other roads 30+. Around town guessing mid twenties, used to get on a long run 35ish. Once on a London trip had 38 actual.
Click to expand...

Seems a bit low to me, but without knowing how you drive, and how many hills and all the other stuff, its hard to say. I'd try a boost gauge - it might tell you something - it might, hopefully will, confirm all Ok, and might just add to your confidence in leaving it alone..:)
 
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