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HUGE amount of exhaust smoke


jenevers

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About a month after I bought my boat, ten years ago, I started the engine up one morning and a HUGE amount of smoke came out of the exhaust for a couple of minutes. You couldn't see across the canal!

Eventually things settled down and this has never happened since (or before that one time). I've often wondered what caused this. Anyone got any ideas?

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Did it take more cranking than normal ?

 

Perhaps after 10 years you can't remember !

 

Had you recently topped up the oil (tho I don't know whether the oil filler is on the rocker box like a car engine) ?

 

As Richard says what colour - black would unburnt fuel, blue would be oil.

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About a month after I bought my boat, ten years ago, I started the engine up one morning and a HUGE amount of smoke came out of the exhaust for a couple of minutes. You couldn't see across the canal!

Eventually things settled down and this has never happened since (or before that one time). I've often wondered what caused this. Anyone got any ideas?

Taking a huge leap across the pit of conjecture - sticky exhaust valve

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If the engine had not been used for a long time it could have been "winterised" by pouring some oil into the bores and turning it over to put an oil layer on the bores to prevent corrosion. On starting this would burn off and create lots of smoke.

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It must have been doing an automatic purging of the catalytic converter ohmy.png

 

Tim

 

 

 

 

 

More realistically, if the silencer had been in use for a long time before you bought the boat, something happened to dislodge or even ignite soot built up inside it.

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It must have been doing an automatic purging of the catalytic converter ohmy.png

 

Tim

 

 

 

 

 

More realistically, if the silencer had been in use for a long time before you bought the boat, something happened to dislodge or even ignite soot built up inside it.

That sounds the most likely explanation. Well I hope it never happens again!!

It was bloody embarrassing.blush.png

Edited by jenevers
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That's not embarrassing! Filling six lanes of the M40 with burnt oil smoke is embarrassing. I had to wait ages for the RAC man

 

Richard

 

I once saw an engine (in a boat) destroy itself right under the M56 bridge at Preston Brook. I've never seen so much smoke. The motorway must have been a complete white out.

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