broken injector pipe

[kireonriley]

have any of you ever repaired a broken injector pipe while at sea if you have please tell me how . we broke one and could not stop the leak we did manage to slow it down with a piece of ruber pipoe and a hose clip .ta Kieron

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[dickh]

Injector pipes cannot normally be repaired as they are made to an exact length. However, an inline compression fitting might work for a little while but as the pressures are very high will probably leak fairly quickly.
On second thoughts, hydraulic piping fittings should be OK, but not sure if available to suit your pipe size. You would have to shorten the pipe by the length of the fitting to maintain the length.

<hr width=100% size=1>dickh
I'd rather be sailing... /forums/images/icons/smile.gif

 

[banana]

i know that this isnt much help now but i always carry spare injecor pipes. my dad told me that no wagon driver worth his salt in his day went without carrying spare inj. pipes. they are under a lot of pressure and prone to vibration damage. they are almost impossible to repair, especially at sea.

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[Heckler]

the length of the pipe has nothing to do with it, they are v v hi pressure, and unless you have brazing gear on board (i have successfully brazed a sleeve on them in an emergency) you will struggle, the rubber hose biz would not have helped at all and you would have been down a cylinder. hi pressure stainless steel pipe compression fittings would work if you could get the correct size, but the best to do if you have a multi cylinder engine is to put the end of the pipe into a bottle and collect the excess fuel to save making a mess until you can fix it, the cylinder wont fire obviously.
stu

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[david_bagshaw]

The length of the pipe is important, if the repair is effective as with unequal lengths, the injector will recive its pulse/ delivery at a fractionaly different time & affect smooth running & reliability.


In reality the answer is to carry a spare set of pipes.

<hr width=100% size=1>David
<A target="_blank" HREF=http://www.euroboating.net>http://www.euroboating.net</A>

 

[stubate]

the nice thing about this forum

is that there is always some one ready to jump in and disagree.
the fluid in the pipe is incompressible, what you put in one end you get out the other at the same time, so whatever the length is it doesnt matter.
nice web site, very professional!
stu

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[mtb]

At a min of 15 atmospheres nout but the correct spec pipe will do. There is a danger re the high pressure fuel being injected under your skin if you take risk's.
You would think some bright spark would market a flexable ( re length ) pipe in a few sizes to suit the main applications, as a get you home kit.

Cheers
Mick

<hr width=100% size=1>One day son all this will be yours #### off I dont want it

 

[colvic]

Re: the nice thing about this forum

Yes you are right, but when the fluid is being moved by pulses and not continual pumping won't the extra length then cause a delay in the time taken for a pulse to reach the injector?


Phil

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[colvic]

Did manage a temporary repair that lasted a couple of days by using rubber fuel hose over the faulty pipe then clamped at both ends and over the actual crack/break. Keeping the rubber hose as short as possible and the three clamps/jubilee clips close to each other reduces the amount of rubber hose that isn't reinforced by the clips and prolongs the life of the "patch".

1.8Ltr BMC diesel, front cylinder. Pipe cracked due to vibration. Quite amazed at how much diesel came out.

Phil

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[oldharry]

Trouble with an emergency flexible pipe is that not only is the length important, but the internal diameter. Incorrect sizing will result in incorrect delivery to the injector, resulting in degradation of the charge at the nazzle, leading very quickly to a misfire etc.

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[stubate]

its like having a second wife

NO !!!
what you put in you get out instantly, INCOMPRESSIBLE
aaargh!!!
stu

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[gunnarsilins]

Length?

So if the length of the pipes would´nt matter, why have the pipes going to the injectors closest to the injection pump excessive length on my 4 cyl Perkins?
They are bent sevral times and led along the cylinder head back and forth for quite a bit.
There must be a reason behind this.

I also carry (aquired by the former owner) two straight spare pipes of exact the same lenght. I was told these would be supposed to go to any of the cylinders just by bending them accordingly.


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[david_bagshaw]

Re: the nice thing about this forum

Thanks re web site,

as to pipe length, what about the pipe expanding ?

If it did not realy matter why do manafactures "waste" so much pipe to ensure they are the same length, or may be it is due to resonance?

regards

<hr width=100% size=1>David
<A target="_blank" HREF=http://www.euroboating.net>http://www.euroboating.net</A>

 

[longjohnsilver]

Re: the nice thing about this forum

I always believed that the length was vital, if not as others say, why don't the injector pipes take the most direct route to the injectors?

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[stubate]

they dont

make em all the same size, if you have seen as many injector pipes as i have you would know that they are not all the same size.
stu

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[stubate]

to fool forumers

into applying warped logic to make an idea seem right.
the prob here is that if a forumer doesnt know, he thinks that he is that clever that his logic can make it what he wants to believe.

stu

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[burgundyben]

Re: they dont

I think your wrong, and LJS is right, they are all the same length, its to do with timing of the pressure wave along the pipe to ensure that the nozzle on the injector opens at the right time after the fuel pump does its thing.



<hr width=100% size=1>Sod the Healey - I think I'll buy an E-Type.

 

[vyv_cox]

Pipes

From Introduction to Internal Combustion Engines, Richard Stone. ISBN 0 333 37594 7.

The behaviour of the complete injection system is influenced by the compressibility effects of the fuel and the length and size of the interconnecting pipes. The compressibility of the fuel is such that an increase in pressure of 180 bar causes a 1% volume reduction. Pressure waves are set up between the pump and the injector and these travel at the speed of sound. The pressure waves cause pressure variations which can influence the period of injection, the injection pressure and even cause secondary injection.
After the pump delivery valve has opened there will be a delay of about 1 ms per metre of pipe length before the fuel injection begins. To maintain the same fuel injection lag for all cylinders the fuel pipe lengths should be identical. During a typical injection period of a few milliseconds, waves will travel between the pump and injector several times.

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[carannah]

There are kits available for injector pipe emergency repairs. The company is Catton wire industries. Phone 021 7063205 and reasonably priced.

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[burgundyben]

Re: Pipes

thanks, I reckon that settles it!!

<hr width=100% size=1>Sod the Healey - I think I'll buy an E-Type.