Morning all,

The other day while trundling down the M25, my 2001 passat tdi wouldn't rev above 2000 while under load (about the same point the turbo comes in at). Got recovered home, took the engine covers off, and found that the boost pipe (which comes up from underneath the passenger side headlamp somewhere, then joins a plastic pipe which goes up behind and around the engine) wasn't fitted properly, it had pulled to one side and was almost completely out. I refitted it, took it out for a test drive, and it was fine.....

went to go to work this morning, and hadn't got more than about 3 miles, when I heard a pop, and lost power again, figuring the pipe had blown off, I stopped and checked, and yes it had....

so, my question is: The circlip which holds this assembly together seems a bit weak, is it likely that the circlip isn't capable of holding the pressure for which the pipe is designed, or could a problem somewhere else be over-pressurising it? There were no engine warning lights showing either time btw.

TIA,


Vince

use a proper jubilee clip or, better still, a 'band clamp'. ive used band clamps on silcion hoses over non-beaded aluminium pipes. 1.5bar no problems.

Had a similar problem with the PD engine in my Galaxy, I think you may need to change the hose. I think the plastic end on the hose gets tired after a while and pops off.
Steve

If its like my Audi TDi a lot of the pipe clips are one use only as they are quick n cheap to fit on the production line. When a pipe split on mine I had a piece of silicone hose and a couple of jubilee clips to hand.

You need a new pipe mate. They are quite common to blow off and not stay attached.

I had exactly the same problem. The clip only fits on one way. I had a specialist look at it and they took off the jubilee clips fitted it properly and I've had no troubles since.

Got a 150 PD TDi Golf.

You're right those clips are a bit fragile. A jubilee clip can't be fitted because its a hard connection, with nothing to squeeze if you see what I mean.

I got round it by putting a cable tie around the hose, close to the hard connector, and the same where it connects to. Plug the hose in then bind together with a couple of additional cable ties. Sounds a bit gash, but it can be done quite neatly and mine have been on for 30K miles no problems.

I'll try and get some pics up of what I did if your a bit confused

Self tapping screw works , a bit of a bodge but one I did a year ago is still going strong.

Same happened on my skoda, kept putting it back on and it kept popping off after a while. New pipe for about £15 from dealer sorted it. Bugger to fit though without taking a load off!

Thanks for the replies all,

Looking at it in daylight showed that the clip was actually missing a bit! I'd put it on the wrong way when I put it all back together first as well. It's now held half-on with the clip, and the other half with a couple of cable ties, till I can get a new clip from VW. The joint doesn't seem great (even on the end with the good clip) - hence the big slick of oily sludge along the crossmember underneath it I think....

Cheers


Vince

Happened to my old Audi 80 TDI. No power, smokey exhaust.
Fixed the pipe and all good.

When a few years later in my workmates Golf TDI, we were climbing a hill at full beans it happened again.
The huge "PSSCCHHTTTT !!" noise that it makes when the pipe comes off only got as far as PSC.. when I said "boost hose" in a relaxed matter of fact fashion.

He gave me that sad look that non car people give you, the one that suggests you're a bit too close to your hobby and need to get out a bit more.

In the Golf it's even worse as all of the hosery is buried in the OS wheel arch.

That it had all been disturbed the previous day when the cambelt was being done kindova seals the deal.