white smoke

[icepatrol]

hi all.
has anyone had "white smoke from their engines and if so what is it.
mine have this but they clear mostly after warming up but doesnt totally go away.
two stroke gm`s.

 

[RobWales]

Are you sure its not steam?

 

[icepatrol]

no. engineer claimed it was "white smoke"

 

[colingr]

Sounds like you have a new Pope on board.

I concur with the steam theory. 2 strokes usually throw out brack smoke.

 

[icepatrol]

yes i was wondering what name the new pope would be given.
i thought the steam would clear once "burnt off " with heat.
i think i may of heard of white smoke before but on a car engine and it was something to do with valves.
sorry to sound vague but my knowledge is very limited.

 

[jimg]

Not sure if it helps...

http://www.uniteddiesel.co.uk/diesel-engine-smoke.php

 

[Moonshiners]

If it's very light and clears after a minute or two when warmed up, I wouldn't worry to much, if it's gassing you out or continues after the engine/exhaust warms up, seek advice.

IMHO.

 

[Bilgediver]

Yep.....a ferry boat called the ST George used to lay a white smoke sceern from the Hook of Holland to Harwich and back again every day.... Always knew when she had done the run if flying to Rotterdam or Schipol .

St George ....Green Rover....Welsh and Cornish city all did this with surprisingly regularity just like the Cranes on Bennevis....The common factor was TWO stroke diesels and in these cases it was the lub oil which burnt white and not blue.

Are you using oil out of the sump?????

Divemaster should be along soon as his nose can sniff out a GM at 100 miles and I am surprised he hasn t popped in to put us right.

If it is steam then it usually disappears within a few metres of the exhaust. If it is smoke it rolls on across the sea.

 

[Divemaster1]

If it is white smoke (not water vapour) after running up and also under load (underway).

Then it could be a number of things;

The injectors on these engines are individual small pumps of fuel and one of these can be "leaking" or out of sync (give more fuel than the others).

You can isolate the ofending item by taking rocker covers off and "forcing" one-by-one of the injectors to "no fuel"... Someone who knows what to do and one needs to be replaced (approx £70) and a 20 min job... + tune-up (approx 2 - 3 hrs on a V8) .

If engines starts up quickly, it is probably a tune-up which is required, and perhaps one leaking injector... Simples ...

 

[mjf]

Yes .

After a lot of research it was caused by bad timing of the fuel pump the drive of which had a bolt that failed and twisted under load.


warranty covered it and sea start fixed it. Caused a concern a few bank holidays ago now in Salcombe.

There was so much white smoke as i arrived you would have thought the red arrows were in town.

 

[Divemaster1]

/forums/images/graemlins/wink.gif /forums/images/graemlins/wink.gif Been involved behind the scenes here....

Anyway, as mentioned, the injector on these engines is a mini fuel pump, which needs to have its timing adjusted... and then exhaust valves and fuel rack...

An injector looks like this:

and when you expose it amongst the others...

If timing is poor on one or more injectors they will over/under fuel and white smoke may be a result...

These little things also go wrong, and may need replacement ... above I indicated on how to find out which of these litte £$%%^ may be the offending item...

Loads of other things you can do to check things out... but in general these iron lumps are rock solid, but needs some TLC and patience when tuning as this is mechanical stuff and needs some spanner time to understand the links and what affects which piece.... Simple really when you go by the book and do not try to make shortcuts....

 

[Bilgediver]

Yes underfuelling will produce white smoke...suppose the other cylinders carry it and hence low fuel to air ratio in underfuelled cylinder....Oh to hear the music of those V71 s ..

/forums/images/graemlins/laugh.gif /forums/images/graemlins/laugh.gif

 

[Bilgediver]

Was a regular customer of Turner Diesel but hardly ever saw them as they went airfreight to egypt..

Our lads used to touble shoot with an infra red gun from RS Components/Maplins. However on the industrial engines the exhaust flange is exposed and gives a good target. WOuld you get a representative reading from the head of a marine v71 or similar where it would show which was the lazy cylinder?

 

[Divemaster1]

[ QUOTE ]
......Our lads used to touble shoot with an infra red gun....... However on the industrial engines the exhaust flange is exposed and gives a good target. WOuld you get a representative reading from the head of a marine v71 ....

[/ QUOTE ]

Most 71's have them exposed and as easy targets.... Same base engines, and marinising kits does not restrict access to the manifolds...

Here are mine ...

The V8's should have similar acces to these which are Low Profiles and angeled outwards...... sort of one of the halves of a V12..

 

[hlb]

any smoke is better than no smoke, at least it works. If it stops smoking worry!!