Is this injector whistle?

[isisalar]

I have recently, to cure a diesel leak, replaced all the injector seals and washers on my HDI. I thought that this may also cure a whistling sound I'm getting, possibly due to poor sealing of the fire washers. Despite getting the seats as clean as possible and fitting new washers the whistle remains.
Before going down the re seating route I need to ask you good chaps if it is indeed injector whistle or am I barking up the wrong tree?
With the car stationary there is no whistle at all up to about 3000rpm when there is a very slight 'ringing' which has gone by 4000 rpm, at least nothing I can hear.
When moving the whistle starts at about 2000 rpm and gets louder up to 3000 rpm and then gets lost in the general engine/wind noise. It can't be heard with the windows shut.
I gave it some welly on the 414 Hertford to Hatfield Saturday evening, lovely bit of road, and it has seemed to improve, I've also noticed that it can vary, possibly temperature or incline related.
With it only happening with the engine under load would this point to a turbo problem?
I'd be very grateful if someone can throw some light on this.
Cheers
Paul

[411514]

Paul, I havn't been following your issue from the start, so apologies if it has already been covered.
A whistle like as you describe generally does originate from either a boost pipe, or indeed the turbo.
Have you checked the fit of all clips and clamps on the boost hose and the integrity of the hosing itself.
If I am correct yours does not have an intercooler?, which narrows down you choices a bit as front mounted intercoolers in particular can easily pick up holes through stones off the road.
If I was you I would try removing all boost hosing right back to the turbo, examine it for holes and then replace with new clamps.

However it is worth noting that turbo's often do naturally make quite a loud whistling noise although I'm sure you know this already.
Sam

[RichardW]

Sounds like a boost leak - can you change the pitch by altering the throttle position slightly? Mine has been doing this for a while - I found the turbo outlet pipe was oily a while back, crunched up the jubilee clips, and the oil has dried up now, but the noise remained. Last weekend I noticed a bit of an oil patch under the IC outlet connection. Tightened this jubilee clip up a bit, and that appears to have cured it - it is currently a bit difficult to tell though, as the exhaust has a hole in it which makes a rushing should when pressing on, and that rather hides any slight turbo whistle! Must get it off and weld it up again. Due to the pulsing nature of the combustion, I doubt an injector will whistle - more like chuff like a steam train!

[Mandrake]

it is currently a bit difficult to tell though, as the exhaust has a hole in it which makes a rushing should when pressing on, and that rather hides any slight turbo whistle! Must get it off and weld it up again.

For someone who hates welding exhausts you sure do a lot of it!

[RichardW]

Not really - I've been putting it off for about 6 months.....

[isisalar]

Thanks very much for the feedback chaps, all useful stuff, I can now stop worrying about the injector seals and venture into unknown territory with the turbo and associated pipework.
I've had a look in the BOL for a picture but can't find one. If someone could tell me the location of the turbo as a starting point I'd be grateful.
Re the chuff chuff noise Richard, I know exactly that noise, as on 2 occasions no 4 came completely loose suddenly due to a stripped clamp stud, sounded like a blown exhaust.
Is there anything detrimental with this leak, obviously performance will suffer a bit but in terms of fuel consumption engine life and reliability will it affect things if it's not cured?
411544 it does have an intercooler afaik being the 110, thanks, going to have a look now.
Kind regards and wish me luck.
Paul

[411514]

411544 it does have an intercooler afaik being the 110, thanks, going to have a look now.

Your quite right Paul I was assuming it was a 90. That would make a good candidate to check first. Usually a hole may be identified by oily discharge around it on.

Are you sure that you definetely have a problem and aren't just hearing wind noise or the like. Boost leakages, even small ones normally manifest themselves with pronounced losses in power and often can play havoc with engine management, triggering limp home mode and stuck open wastegates,

Sam

[isisalar]

Sam thanks
It's certainly not wind noise as it happens in 1st and 2nd most noticeably at very low speeds, in third the general wind noise drowns it out as by then probably doing 40+mph.
It's not turbo whine, that's one of the presents my TD gave me a few months before it went, so I'm familiar with that sound.
It could be described as a screech? Bearing failure? Tensioner?
Off for a look.
Cheers
Paul

[411514]

It did cross my mind as to whether the noise could be bearing or belt related actually.

I suppose the only way to tell is to get your head under the bonnet.

Sam

[isisalar]

I'd need a very long neck as it's only evident under load, either that or a rolling road.
Having a poke around today I discovered that no. 4 is STILL leaking diesel. Re seating seems to be the best option and is now the priority. Rain stopped play with the leak finding today but I did discover some oil weep around a flange coupling on the right hand side behind the engine. Looks like some dismantling will be necessary to fully investigate, something my back won't like at all.
Is there a diagram or picture on the forum showing whats where re the turbo/intercooler plumbing, this is new ground for me.
Cheers
Paul