1.6tdi 125000milee

 

Turned the key on and it started to knock. Took it in my garage and the knock was getting louder. I noticed some coolant has gone as well. 

 

https://youtube.com/shorts/NfXbM7IEJfY?feature=share

 

 

It may be HGF, even an injector seal leaking can sound like that.

 

It didn't sound metallic to me so I doubt the engine's dead.

how can I test the injectors? can I use VCDS?

18 minutes ago, Bertie90 said:

how can I test the injectors? can I use VCDS?

 

Yes you can, it's a 1.6 TDI so injector failure is not so much a case of "if" but "when".

so I suspect injector 1 is no good? what about injecor 3? 

It's a 1.6 TDI so best advice is to replace all four injectors since they all fail very close to each other, looks like two of yours have gone already. By all means confirm the diagnosis, injectors are not cheap.

so I replaced all 4 injectors with reconditioned units, the reading look a lot better but my engine sounds the same 😞 I coded the new injectors too. 

Edited 1 September, 20223 yr by Bertie90

https://youtube.com/shorts/r5_04TQxoxw?feature=share

Unfortunately it's probably HGF given the coolant loss, can you get a compression test done?

7 minutes ago, sepulchrave said:

Unfortunately it's probably HGF given the coolant loss, can you get a compression test done?

I did a test with one of those chemical testers and it came negative, no change in colour. I will see if I can get my hands on a kit. Does that not sound like a bearing rod?

I've done something possibly stupid, I've unplugged each Injector at a time and the sound made no difference. I'm leaning towards bearing failure. I'm at the point now where I can't afford to spend anymore money on this car. I will take it to a garage tomorrow for their diagnostic and sell it as it is. It went from a relatively nice car to cruise on motorways to a sack of metal. 😕

59 minutes ago, Bertie90 said:

I did a test with one of those chemical testers and it came negative, no change in colour. I will see if I can get my hands on a kit. Does that not sound like a bearing rod?

 

Unfortunately those chemical testers are not always reliable, particularly on diesels, a big end is a much louder metallic knock, a little end is a metallic click and a broken piston ring ticks.

2 minutes ago, Bertie90 said:

I've done something possibly stupid, I've unplugged each Injector at a time and the sound made no difference. I'm leaning towards bearing failure. I'm at the point now where I can't afford to spend anymore money on this car. I will take it to a garage tomorrow for their diagnostic and sell it as it is. It went from a relatively nice car to cruise on motorways to a sack of metal. 😕

 

You can put the old injectors back in and sell the recon set separately and get most of your money back so it needn't be a disaster.

can this be a hydraulic lifter issue?

42 minutes ago, Bertie90 said:

can this be a hydraulic lifter issue?

 

The noise could be, but I'm concerned by the coolant loss you report, the noise taken together with that suggests HGF.

I've completed a injector adaptation again this morning and the car did it's reving thing for 20min and when I went back to inspect the engine bay, I also topped up the coolan system with some of that steel seal HG liquid which took it bang on in the middle of the tank, and this is what I found. That missing coolant is back, wtf... It was way below the min line and now it's at the top. Also I was peaking under it when it was reving and the knocking sound was definitely louder under near the oil pan. I might pull the pan off and inspect the bearings just for the fun of it at this stage.

The mysterious coolant level change is almost certainly caused by HGF, the system is being pressurised by combustion gases blowing past the gasket fire ring and that is also likely to be the source of the chuffing sound.

I fear I'm repeating myself here but I've a LOT of professional experience with engines and I've said right from the start that it's not a bearing failure and I stand by that.

I really wish you hadn't put magic jizz in the coolant because it won't fix anything, it'll just gum everything up.

I was desperate I tried. What's this car worth in this condition? Scrap value?

32 minutes ago, Bertie90 said:

I was desperate I tried. What's this car worth in this condition? Scrap value?

 

What's wrong with repairing the head gasket, you've just spunked a load on injectors already.

 

You seem very impulsive, I strongly advise you to take a deep breath and calm down, start thinking rationally, not emotionally.

 

The value of a car is in it's utility, not cash, I appreciate that yours is currently an oversized paperweight but you need to solve the problem, if you can't get to work then buy a cheap runabout for now and take this one off the road or take it to a garage who'll lend you a courtesy car while they fix it for you.

I have 2 other cars, this one was for motorways only as it's more confortable to drive long journeys. 

 

I think I might park it for a while and have a good think about it.

so I had a friend that came over and he pretty much said bottom end in his opinion. We did a compression test 390psi, 390psi, 380psi, 380psi (last two the battery was struggling still on charger).  Compression looks good. 

 

Then we took the cam cover off to check for cam wear and everything looked smooth and shiny but didn't do anything past spinning it and checking the cams. Img for reference but not sure you can see anything.

 

I'm not sure if it's a head gasket still, I am still taking in consideration what has been said so thanks @sepulchrave it's still on my list. 

 

Next step is oil pan off and inspection of the bearings. 

 

I have a camshaft position reading of -1.5° at all times not sure if this makes a difference?

 

Side note, there is some oil coming off between engine and gearbox, a mist but noticeable.

Edited 10 September, 20223 yr by Bertie90

Top end looks tickety boo, compression readings also decent.

 

Why do we think there's something wrong with the bottom end when the cooling system is clearly getting over pressurised again?

Because of the rattly cluncky noise at high revs? Does a head gasket causes that? 

what other test can I possibly do to diagnose a bad head gasket?

1 hour ago, Bertie90 said:

Because of the rattly cluncky noise at high revs? Does a head gasket causes that? 

 

I heard a chuffing sound on your video.

 

So you're saying the coolant problem is entirely coincidental and unrelated to the sound?