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Post by Boaty on Nov 8, 2019 10:55:23 GMT
Have not been to the boat for a few weeks so swung down there yesterday to give the engine a run and have a general check around. All ok and the awful rain has been kept out side the boat! Engine start was a bit smokey (well very). Took about 4 goes on the preheat to get the engine actually running. Prior to that it immediately fired after preheat and tried to run but would not respond to the throttle and died. Each attempted start gave clouds of white smoke and once started the engine smoked for a minute to two (and was a bit lumpy) before settling down to pretty smooth and smoke free (or close to) running. Oil pressure is fine 60 when cold and at fast tickover. When hot engine at tickover is around 40 which climb to around 60 at running revs. I'm told all is ok but I just do not like the early white smoke which is unburned diesel I am advised. Thoughts please?
Thanks
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Post by Deleted on Nov 8, 2019 11:08:13 GMT
It seems to me that assessment is correct and there is nothing to worry about. Perhaps the lump was a bit reluctant because you haven't turned it over in a little while. I have never met an engine that responded well to being ignored. Maybe test the theory by starting it again on Sunday...if the same reluctance to fire shows itself, then perhaps dirty injectors may be a cause. But before you do investigate that, and as has been lately pointed out by Tony, check fuel lines, filters, etc and also the crankcase breather, air filter etc. The handy-dandy guide I have just found states that if all is well with fuel delivery and air-flow, the next thing to look at is valve clearances.
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Post by Deleted on Nov 8, 2019 12:03:45 GMT
Have not been to the boat for a few weeks so swung down there yesterday to give the engine a run and have a general check around. All ok and the awful rain has been kept out side the boat! Engine start was a bit smokey (well very). Took about 4 goes on the preheat to get the engine actually running. Prior to that it immediately fired after preheat and tried to run but would not respond to the throttle and died. Each attempted start gave clouds of white smoke and once started the engine smoked for a minute to two (and was a bit lumpy) before settling down to pretty smooth and smoke free (or close to) running. Oil pressure is fine 60 when cold and at fast tickover. When hot engine at tickover is around 40 which climb to around 60 at running revs. I'm told all is ok but I just do not like the early white smoke which is unburned diesel I am advised. Thoughts please? Thanks I am inclined to think you may have water ingress through the exhaust exit, which is then causing condensation in the manifold. Worth checking.
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Post by Clinton Cool on Nov 8, 2019 12:27:38 GMT
Have not been to the boat for a few weeks so swung down there yesterday to give the engine a run and have a general check around. All ok and the awful rain has been kept out side the boat! Engine start was a bit smokey (well very). Took about 4 goes on the preheat to get the engine actually running. Prior to that it immediately fired after preheat and tried to run but would not respond to the throttle and died. Each attempted start gave clouds of white smoke and once started the engine smoked for a minute to two (and was a bit lumpy) before settling down to pretty smooth and smoke free (or close to) running. Oil pressure is fine 60 when cold and at fast tickover. When hot engine at tickover is around 40 which climb to around 60 at running revs. I'm told all is ok but I just do not like the early white smoke which is unburned diesel I am advised. Thoughts please? Thanks I am inclined to think you may have water ingress through the exhaust exit, which is then causing condensation in the manifold. Worth checking. Interesting idea. My exhaust port, rather than being round and open has had a metal pull handle glued to the outside, covering the top half of the hole. I can only assume the previous owner fitted this to prevent water ingress to the exhaust, perhaps because of the problem you describe?
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Post by Mr Stabby on Nov 8, 2019 13:43:49 GMT
It's fucked.
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Post by samsam on Nov 8, 2019 13:51:06 GMT
Does the exhaust have a raised swan neck to prevent water running back into the engine?
Ignore Stabby idiot, his profanity only exceeds his stupidity by a point or two.
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BMC 1.5
Nov 8, 2019 14:44:46 GMT
via mobile
Post by Deleted on Nov 8, 2019 14:44:46 GMT
Could be nackered heater plugs.
I've got a pair of 1.5s in my boat and one of them does seem to smoke a little bit more than the other after starting. Interestingly there is a packet of heater plugs in the spares drawer so I wonder if it was something previous owner was aware of but did not get a round tuit.
ETA it has become a little colder this week. I've not had BMC engines before but I do associate white smoke after starting with heater plug issues of some sort. Either the wiring to the plugs or the plugs themselves. If one did not work then you would get one cylinder not firing and therefore ejecting some white smoke while the others rotate the engine and after a while the unheated one warms up and runs normally.
A weakness of an indirect injection compression ignition engine. The individual heater plugs need to all work properly.
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BMC 1.5
Nov 8, 2019 14:45:19 GMT
via mobile
Post by Deleted on Nov 8, 2019 14:45:19 GMT
Does the exhaust have a raised swan neck to prevent water running back into the engine? Ignore Stabby idiot, his profanity only exceeds his stupidity by a point or two. He was doing a joke FFS !
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Post by Boaty on Nov 8, 2019 15:25:22 GMT
The preheat works fine and it was all running at 4th attempt. It also started to run and just stalled on all previous attempts. They are new glow plugs. Once warmed up she runs smooth as silk, it is just the initial smoke that was of concern (although I know BMC are renowned for it). I'll certainly check the exhaust as no swan neck exists and as the boat is not sitting square in the water (due to some furnishings being removed and awaiting replacement) water ingress is quite possible. Must admit, Mr Stabby's joke went over my head a bit :-)
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Post by Deleted on Nov 8, 2019 15:32:09 GMT
Must admit, Mr Stabby's joke went over my head a bit :-) Joke or not, it was a stupid reply to a question that had been made with genuine concern.
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BMC 1.5
Nov 8, 2019 15:36:28 GMT
via mobile
Post by Deleted on Nov 8, 2019 15:36:28 GMT
Maybe it actually IS fucked. Completely unuseable. If so I'd be willing to take it away for £50.
Edit to clarify I would be paying the reddie not asking for it.
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BMC 1.5
Nov 8, 2019 15:58:28 GMT
via mobile
Post by Deleted on Nov 8, 2019 15:58:28 GMT
Regarding the smoke it is quite easy to tell the difference between condensation and unburned fuel. The first one is steam (obviously) the second one is thick white smoke which is the atomised diesel which has not combusted as it should have done but is expelled into the exhaust system.
It might be worth cracking each injector union in turn with engine running at say 1200rpm ie well above tickover and see if there are any weak cyclinders.
Obviously opening the union you make the engine run on 3 so if there is a dodgy one it would make less difference than the others to the way the engine runs. If that makes sense.
5/8 af spanner I think it was. 17mm also fits. for the injector union nuts.
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Post by Mr Stabby on Nov 8, 2019 16:05:47 GMT
Ignore Stabby idiot, his profanity only exceeds his stupidity by a point or two. Apologies, I belatedly realise that I should have expanded slightly with my diagnosis. The fucking fucker's fucking fucked.
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Post by metanoia on Nov 8, 2019 16:08:00 GMT
Ignore Stabby idiot, his profanity only exceeds his stupidity by a point or two. Apologies, I belatedly realise that I should have expanded slightly with my diagnosis. …. that can be the trouble with these technical threads ….. met x
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BMC 1.5
Nov 8, 2019 16:14:55 GMT
via mobile
Post by Deleted on Nov 8, 2019 16:14:55 GMT
Ignore Stabby idiot, his profanity only exceeds his stupidity by a point or two. Apologies, I belatedly realise that I should have expanded slightly with my diagnosis. The fucking fucker's fucking fucked. Reported.
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