lw395
Well-Known Member
That's terrible!
Diesel bug in white diesel
- Thread starter Jabs
- Start date
That's terrible!
geem
Well-Known Member
It sounds like it, but with all due respect to the OP thats Janet and Jill book one. Absolutely imperative that an injection pump has perfect filtration. They will not tolerate any muck.
stranded
Well-Known Member
Sorry for not being very clear - I am passing on my poor understanding of what I have been told rather than having any knowledge myself. Apparently, when the water in the separator bowls reaches a certain level it can then be forced through the filters, with the result that water got through to the primary filter and then the injectors and damaged them. It was the consequent leakage of significant quantities of diesel though that has probably done more fundamental damage.
But I didn't mean to hijack the op's thread - I just gave my experience to underline the need to take diesel quality seriously.
Nicholas123
N/A
Leakage from where? I can't see how there could be a "consequent leakage"
If you allowed your water separator to become so full that it overflowed & passed on down the line then you really have only got yourself to blame & that has'nt got anything to do with the diesel bug.:disgust:
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Freebee
Well-Known Member
Nooka has told you:
Lots of unburnt fuel found its way into the oil, so possibly been run for several hours effectively unlubricated. Turbo seems OK. Lift pump seems OK. But warned that injection pump possibly knackered; injectors almost certainly so; and cylinders possibly also, which is point at which repair/replace economics come into play. All 'apparently'.
water in the fuel leads to bad atomisation and hence fuel droplets in the cylinder which dont combust correctly and may by pass the pistons. Although I guess once the engine was srtipped the decison making came thick and fast on repair or replace, with the mechanis suggesting that having torn down the engine you may as well fix all the issues and potential issues at once.
Lots of unburnt fuel found its way into the oil, so possibly been run for several hours effectively unlubricated. Turbo seems OK. Lift pump seems OK. But warned that injection pump possibly knackered; injectors almost certainly so; and cylinders possibly also, which is point at which repair/replace economics come into play. All 'apparently'.
water in the fuel leads to bad atomisation and hence fuel droplets in the cylinder which dont combust correctly and may by pass the pistons. Although I guess once the engine was srtipped the decison making came thick and fast on repair or replace, with the mechanis suggesting that having torn down the engine you may as well fix all the issues and potential issues at once.
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Nicholas123
N/A
Sounds like so much water was in the system that it is a wonder that the engine ran at all.......still got nothing to do with the diesel bug.
Freebee
Well-Known Member
The issue is often that fuel systems have several stages of filtration and separation, separators are simply devices that are designed to allow fuel velocity to slow as it passes through ,hence water will be dropped out. somtimes they use media to assist this process. Filers simply contain media only.
Often the separator is the first line of protection. if the separator remains undrained the next stages are just filtration only and the water will just pass through the filters and into the engine. the pleated media having little or no means to separate water.
There is an added complication to this scenario when some manufactures combine the separation and filtraion stages in one metal canister.
Its all about the house keeping I am afraid!
Often the separator is the first line of protection. if the separator remains undrained the next stages are just filtration only and the water will just pass through the filters and into the engine. the pleated media having little or no means to separate water.
There is an added complication to this scenario when some manufactures combine the separation and filtraion stages in one metal canister.
Its all about the house keeping I am afraid!
Nicholas123
N/A
Separators do just that, separate the water from the fuel & the idea is that you then drain it off.(there is usually a drain plug at the bottom of the separator,at least there is with mine).
stranded
Well-Known Member
Leakage from where? I can't see how there could be a "consequent leakage"
If you allowed your water separator to become so full that it overflowed & passed on down the line then you really have only got yourself to blame & that has'nt got anything to do with the diesel bug.:disgust:
I wasn't looking for sympathy, but thanks for rubbing it in, charmer.
stranded
Well-Known Member
Thanks Freebee - I know. I do check the filters regularly, and did, together with oil and coolant before this trip. But after 3 1/2 seasons where there has been no need to drain the separator from one season to the next (I do replace all filters every winter), I have got out of the habit of checking on long passages. Never again!
Nicholas123
N/A
You don't get sympathy when you put the willeys up people talking about the diesel bug in the way you did.
Your problems were caused by your own inattentiveness & frankly anyone who goes to sea knowing so little about the basics & self reliance dos'nt deserve sympathy from anyone in my opinion.
stranded
Well-Known Member
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Nicholas123
N/A
OK fair enough I suppose that could happen to anyone but clearly you have a problem with water getting in from somewhere.
thinwater
Well-Known Member
The bugs are MUCH smaller than the filter openings, so while the filter can catch colonies, individual bugs (bacteria) will slowly migrate through the filter. Even colonies can be slowly pushed through, since they are not solid.
This is why cleanings must always be followed with biocide treatment.
Also... (I've done a lot of lab testing)
* bug does not require free phase water, though it helps. Silica gel vent filters help.
* conventional, ULSD, and bio-D all infect. The speed is not much different, through the strains can be.
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geem
Well-Known Member
Surely the main purpose of the biocide treatment is to stop regrowth in the tank not at the injection pump? If the engine is used regularly and you have dosed the tank then the injection pump will get a flow of dosed fuel anyway. If fuel filtration is good and water is removed before it gets to the injection pump then there is little for bacteria to grow on. As I understand it the bacteria needs water and particulate in the fuel to multiple. The injection pump must be the least likely part of the whole fuel system to stimulate bacterial growth
thinwater
Well-Known Member
All true.