306 1.9 diesel injector pipes keep breaking

[Robm]

The injector pipes in my 306 keep breaking, usually no.1. sometimes at the injector end and sometimes at the pump end. I have changed the injectors and wrapped PTFE tape round the threads to try and stop vibrations, this succeeded in prolonging the life of them but they still go every couple of weeks.

Also if I have been driving for around an hour the engine starts to stall when the clutch is depressed, I'm not sure if this is linked or just another problem.

T.I.A
Robert

 

[jim.]

The injector pipes in my 306 keep breaking, usually no.1. sometimes at the injector end and sometimes at the pump end. I have changed the injectors and wrapped PTFE tape round the threads to try and stop vibrations, this succeeded in prolonging the life of them but they still go every couple of weeks.

Also if I have been driving for around an hour the engine starts to stall when the clutch is depressed, I'm not sure if this is linked or just another problem.

T.I.A
Robert

My first thought when pipes mysteriosly break is engine mountings? Clutch prob. could be related in some round about mechanical way.

but then I'm not a mechanic ;-)

 

[Mark Rae]

The injector pipes in my 306 keep breaking, usually no.1. sometimes at the injector end and sometimes at the pump end. I have changed the injectors and wrapped PTFE tape round the threads to try and stop vibrations, this succeeded in prolonging the life of them but they still go every couple of weeks.

There should be a couple of plastic clips between the various pipes which no doubt help to dampen out vibration a bit. However the pipes themselves are quite heavy gauge and should be rigid.

Is something else loose and hitting against them, or have they been replaced in the past with the wrong type of pipe?

-Mark

 

[Robm]

The plastic clips are all in place and I have just fitted an extra clip between pipes 1 & 2 in an attempt to further dampen the vibrations. I did buy the pipes from a Peugeot dealers so they are the right type. I have also checked the engine mounts and the fuel pump and they both appear to be secure and nothing else seems to be loose.

The idle speed is quite low and I have thought that it might be causing excess vibrations. I have altered the throttle stop so it doesn't drop so low but bar tweaking the fuel pump I don't know what to do.

 

[Mark Rae]

The plastic clips are all in place and I have just fitted an extra clip between pipes 1 & 2 in an attempt to further dampen the vibrations. I did buy the pipes from a Peugeot dealers so they are the right type. I have also checked the engine mounts and the fuel pump and they both appear to be secure and nothing else seems to be loose.

When you said that the pipes 'break' do you mean that they fractured or that they just started leaking around the unions?

If it is the latter, then I'll take a guess that some sort of pressure relief valve in the pump has gone and it is over pressure. That may also explain the idle problems.

However that is a complete stab in the dark, and would
need someone with specialist equipment to check it out.

-Mark

 

[Robm]

they do tend to split around the olive but occasionally they have completly broken and come away. I was also thinking it may be a pressure problem, that is why I changed the injectors. I shall take it to a specialist and get it checked out.

Thanks for the help and I shall let you know if it solves it.