smoking

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malcwend

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hi there lads,got a plm with 1994 disco 200tdi,she starting up no plm but hell of a smoke coming out of exhaust and also oil filler as well. been told it a turbo thing so i bought another one ,fitted in and the sympton is still the same. it judder when on stationary with tapping noise. the temp is normal ,no overheat,no loss of water.it done 95k miles ,full service history. can anyone help ? much appreciation malc
 
Smoke from the filler cap is usually worn piston rings, blocked oil pickup filter in sump or blocked breathers check breathers then oil pickup (drop Sump) then replace rings. Taking the head off is unlikely to throw any light on the problem. As a blown head gasket would also give you other symptoms.
 
ferget the comp test.. get a leak down test done, its by far the best way of pin pointing where the problem is. apart from the fact yer injun is a turbo diesel so a comp tester is unlikey to be of any use
 
That's right. Around here you get both tests done as part of the so called "compression test", hence wot i wrote.
The leak test part is better cause you can listen/see to were the comp air leaks are: exhaust, intake, crank case (filler), coolant circuit, sometimes even oil circuit if there is a gauge fitted.
 
cipx2 said:
That's right. Around here you get both tests done as part of the so called "compression test", hence wot i wrote.
The leak test part is better cause you can listen/see to were the comp air leaks are: exhaust, intake, crank case (filler), coolant circuit, sometimes even oil circuit if there is a gauge fitted.
Click to expand...
why would yer want both done? specially on a TD injun
 
One thing is that there's almost no difference in price (both tests against leak test only). Another thing is that is must be good for something as soon as most of the tool manufactures in the automotive industry sell diesel comp testers (adapters and gauges). By the way, it doesn't matter if it's an aspirated or a turbo diesel, they perform exactly the same at those testing rev speeds.

The comp test on a diesel engine is good for is that tells you something about the difference in compression between the cylinders. It doesn't help to find out if the piston rings are worn as opposite to the petrol engine ('cause you can't pour oil in the cyl) though.
In this case, presuming one cylinder is leaking because the piston is cracked, you'll know a little bit more about the other three. If all 3 will show about the same pressure, with less than 30-40 psi (or 50-75 psi, depending on the engine size and comp ratio) difference between them, they are ok, you'll only need to replace a piston and it's rings. If too much difference between cylinders you might consider scraping the whole engine or replacing all rings, reseat the valves, ... it depends on what you find on the leak test.
The idea is to take both of the results into consideration.
 
But before you go splashing out on leak and or compression tests check the engine breather and oil pickup filter. as neither cost you any money if you do em your self.
 
hi there lads,wow i didnt think i get lots of response,many thanks ,and now,ive taken the head off and inspected it, it seems ok,the bores are ok and guess what ,its the head gasket gone on the number four bore,the ring on the number four gasket had a gap of 0.5mm so thats why the oil seeped through the gap into number four piston and cause a lot of smoke and juddering. thanks ever so much lads for your help.malc
 
cipx2 said:
One thing is that there's almost no difference in price (both tests against leak test only). Another thing is that is must be good for something as soon as most of the tool manufactures in the automotive industry sell diesel comp testers (adapters and gauges). By the way, it doesn't matter if it's an aspirated or a turbo diesel, they perform exactly the same at those testing rev speeds.

The comp test on a diesel engine is good for is that tells you something about the difference in compression between the cylinders. It doesn't help to find out if the piston rings are worn as opposite to the petrol engine ('cause you can't pour oil in the cyl) though.
In this case, presuming one cylinder is leaking because the piston is cracked, you'll know a little bit more about the other three. If all 3 will show about the same pressure, with less than 30-40 psi (or 50-75 psi, depending on the engine size and comp ratio) difference between them, they are ok, you'll only need to replace a piston and it's rings. If too much difference between cylinders you might consider scraping the whole engine or replacing all rings, reseat the valves, ... it depends on what you find on the leak test.
The idea is to take both of the results into consideration.
Click to expand...
you should log on to the SAGA site i hear they need info about emptying eggs by just using a pin and yer mouth.
 
quote: hell of a smoke coming out of exhaust and also oil filler as well. been told it a turbo thing so i bought another one ,fitted in and the sympton is still the same. it judder when on stationary with tapping noise. the temp is normal ,no overheat,no loss of water.
unquote

Who else thinks it's possibly a cracked piston ..... ?
 
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