Why is there a hole in the piston

Hole in the piston! ! ! Why?

Hello,

are there any indications that a hole is forming in the piston, or does it generally come as a surprise?

Is this a rather creeping process or does it arise spontaneously from the situation?

Hole in the piston at 143000km, 320 CDI T year 2001

Best wishes

Best answer on the topic

Quote:

Originally written by 320tcdi

My preventive measures:

5) Turbocharger renewed

6) Turbo hoses renewed

11) Pressure converter turbocharger renewed

12) Vacuum hoses to the turbo and to the EGR valve renewed

How long do the injectors last?

I agree with you in principle, but to renew the above points as a precaution? Probably only if you suspect any problems, but not just out of whim ...

I think the injectors will last a very long time because of the two-stroke oil. Probably longer than the body ... I haven't worried about it for a long time and lean back and relax ... :)

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21 answers

A long time ago (4 years?) I read an article about chip tuning on Audi TDI machines. Due to changed injection times and quantities, the combustion temperatures were too high and the pistons literally melted in the head. So if the electronics are crazy or the injectors are defective, this can apparently happen.

George

Good Morning...

Even if the article is very old, I'll come back to it.

I noticed a clacking noise in the engine compartment yesterday after a long drive. I drove straight to the workshop. There one said that it is probably a piston seizure. Our person there once had the same car as we did, he had the same one, with him the whole thing just sounded much, much worse. Are there "chances of rescue"?

And if so, what does the fun cost?

What was also noticed is that he sprayed oil, but did it look like it came out of the dipstick? Could it be that maybe only (ONLY ??) one seal is broken?

It makes the noise when the engine is warm and also when it is cold.

Less when standing, more when accelerating ...

How exactly does a hole in the piston sound like?

And what exactly does that say? Or how do you fix it?

LG, the PATIENT's driver !!!!

Could someone write something and not just read ???

You surely know your way around with the stuff ??? Not me!

I am GRATEFUL for any information !!!

LG patient ...

Hello,

I'm a bit surprised with a diesel.

A hole in the piston can be a creeping defect, but it can also happen within a few minutes.

I know the problem mainly from highly charged turbo gasoline engines. If the engine runs just a little too lean there, the piston literally melts away.

Diesel is not my specialty and the combustion and exhaust gas temperature is lower than with gasoline, so I think that this defect tends to develop over a longer period of time.

As already said, there must be a defect in the injectors and / or peripherals

This leakage of oil on the dipstick could indicate overpressure in the crankcase.

Simply unscrew the oil cap (with the engine running, of course) and feel whether it is noticeably blowing out, maybe give a little gas and check whether it is more.

If so, it indicates problems with the piston sealing against the raceways. So piston rings broken, possibly seizure.

Next, I would have compression measured. Then you can see more clearly.

greeting

ghm

Quote:

Originally written by PatrickK

Hello,

I'm a bit surprised with a diesel.

A hole in the piston can be a creeping defect, but it can also happen within a few minutes.

I know the problem mainly from highly charged turbo gasoline engines. If the engine runs a little too lean there, the piston literally melts away.

Diesel is not my specialty and the combustion and exhaust gas temperature is lower than with gasoline, so I think that this defect tends to develop over a longer period of time.

As already said, there must be a defect in the injectors and / or peripherals

Our diesel has around 200 hp, yesterday I drove on the motorway, but not faster than about 160. Of course, I accelerated sometimes more, sometimes less. What happens when the piston melts away? Is the whole engine then gone? In the end, is there only one replacement engine left? Or is it, no matter what may be on the piston, that it can be repaired? Above all, it has to be permanently intact, we drive around 50,000 / 60,000 km a year.

How can you repair a piston (are there actually several ??)? Probably the whole engine has to be compl. be disassembled?

Quote:

Originally written by Patient0815

Could someone write something and not just read ???

You surely know your way around with the stuff ??? Not me!

I am GRATEFUL for any information !!!

LG patient ...

Hey and hallole

A hole in the piston can also occur abruptly due to an oil hammer, oil collects in the intercooler

because, for example, the charger is defective / leaking and your little engine takes a big gulp

already happened.

Chances of rescue?

Now it depends on what you want to and can invest. From the trunk engine

(only the block with piston and crankshaft) is the cheapest in terms of material

Variant, but extremely time-consuming.

if you do not screw yourself or you can do that, it is a used machine

(rarely to get from accident vehicles) be an alternative or an engine from

Engine overhaulers (business directory or ask a question in the forum)

the last and probably

The safest is with the friendly ones who, however, require good liquidity on the account.

Jol.

Quote:

Originally written by Patient0815

Quote:

Originally written by PatrickK

Hello,

I'm a bit surprised with a diesel.

A hole in the piston can be a creeping defect, but it can also happen within a few minutes.

I know the problem mainly from highly charged turbo gasoline engines. If the engine runs a little too lean there, the piston literally melts away.

Diesel is not my specialty and the combustion and exhaust gas temperature is lower than with gasoline, so I think that this defect tends to develop over a longer period of time.

As already said, there must be a defect in the injectors and / or peripherals

Our diesel has around 200 hp, yesterday I drove on the motorway, but not faster than about 160. Of course, I accelerated sometimes more, sometimes less. What if the piston melts away? Is the whole engine then gone? In the end, is there only one replacement engine left? Or is it, no matter what may be on the piston, that it can be repaired? Above all, it has to be permanently intact, we drive around 50,000 / 60,000 km a year.

How can you repair a piston (are there actually several ??)? Probably the whole engine has to be compl. be disassembled?

The 320 has six pistons and a crankshaft which should be renewed as a group. First have the compression checked.

Maybe it's something else succinct. Jol.

Quote:

Originally written by jloethe

The 320 has six pistons and a crankshaft which should be renewed as a group. The hull engine is the only alternative. First have the compression checked.

Maybe it's something else succinct. Jol.

Why renew in a network? If the other pistons are ok, then it is sufficient to replace the defective one.

I don't know how easy it is to get there, but theoretically only the oil pan has to be down, then you can loosen the connecting rod bearing from the crankshaft and pull the connecting rod with the piston out downwards. Installation in the reverse order ...

At least that's how it used to be ...

Or does the piston have to be installed from above?

In any case, I would also replace the injector on the said cylinder!

In the S class forum there was once a huge contribution.

In short, the diesel injectors probably have 7 or 9 small holes. These just kind of clog.

This can be tested using the amount of reflux, very easily using a PC.

If the holes are closed, the pressure on the remaining holes increases. Until it got so big that the jet that ignites when injecting hits the piston when injecting ice. This is too hot for the flask and it melts or burns a hole in the flask. That can be replaced. And then please also test and replace the injection nozzles.

Wow!

Thanks for your messages!

You can do something with that ...

Compression measured, was too low on cylinders 1 & 4.

I already mentioned engine noises, and there is also the pressure in the crankcase. Whatever that means ...

We were told that the repair itself costs around 3500/4000 euros.

We didn't have to clean the injection nozzles until June / July.

Unfortunately, an idiot tinkered with the car .... If you have no idea, you should take your fingers off such a machine!

And as I understand it, this is only the beginning of a nerve-wracking journey ...

We decided to sell the car.

We don't know 100% exactly what the fault is, but we've already put so much into this car in this one year that we're not going to continue. We don't know much about screwing, and certainly not the possibility.

Unfortunately, you never know what to expect, but with a newer car you can hope even more than with an "old" one ... which is really not old ...

So, if anyone is interested .....

Thank you for the answers!!! Thanks!

The patient's mistress ... = (

"Hole in the piston" - a horror scenario for me!

My preventive measures:

1) Regular addition of 2-stroke oil LM1052

2) Use of Mobil1 0W-40 engine oil (change every 12 TKM)

3) Oil separator renewed

4) EGR valve cleaned

5) Turbocharger renewed

6) Turbo hoses renewed

7) Addition of "LambdaServiceTankDiesel" every 5000km

8) no chip running

9) Warm up carefully

10) No 100% load journeys, but max. 70-80%

11) Pressure converter turbocharger renewed

12) Vacuum hoses to the turbo and to the EGR valve renewed

My 320 cdi was once lame and now perky; have the feeling that the engine has recovered after 30000km - has a lot of steam.

Thank God!

But what I'm really interested in:

How long do the injectors last?

Are they unbreakable if you add the whole soup to 2-stroke oil and the cleaner "LambdaServiceTankDiesel" or have to after, for example. 200TKM all injectors are replaced?