VW T2 1.7L Engine Problems: Troubleshooting Guide

Hello!!
I'm having a problem, and I don't know what to do about it right now...
Even our local VW dealership doesn't know anything about it.

When the engine is cold.
It glows red, and I start it. One or two revolutions of the crankshaft, and the engine runs.
So, everything's running normally. It's a little unstable, but that's okay.
"When the engine is nice and warm... and I turn it off and wait for a few seconds, the engine starts without needing to be pre-glowed. So far, everything seems normal."
However, if I turn off the engine after it has reached its operating temperature and then wait for 5-10 minutes, the engine becomes very difficult to start.
That means that usually, nothing happens below 10-15 revolutions of the crankshaft.

Compression is normal. Approximately 32-34 bar on all cylinders.
The cylinder head is brand new, including the valves and camshafts. And the valve timing has been set.
The fuel injectors are brand new. The injection timing is supposedly correct, according to what Volkswagen said. They should check if that's actually the case, but I don't know; I'm not entirely sure about that.

Okay, that's the problem for now. I'm not sure if you need any more data from me.
If anything is missing, please let me know.

Regards, Acid.

Hi Acid.

Do you have a custom modification, or is that a typo?

I only know about the 1.7 naturally aspirated diesel (KY) and the 1.6 turbo diesel (JX) engines – and those were only available in the T3!

The T3 was produced starting in 1983; before that, there was the T2, which did not have any diesel engines available.

This is a T3.


That was the T2:


The problem with the buses is that they are actually called "Type 2 T2" and "Type 2 T3," which confuses many people. And since VW also abbreviates "Type 2" as "T2" in its spare parts catalog, the confusion is complete.

Currently, the T5 is the best option .
T4:
http://www.schmakeit.de/edgar/2003/2003-05-28/S4100000-Tour_de_Leine-VW-Bus-T4.jpg

T5:
http://www.bb-automobiltechnik.de/Bilder/t5_b1_2_g.jpg


Regarding your problem, I would only suggest checking the ignition timing or compression. I had a similar issue with my old Golf2 diesel (1.6L) that was about to die – the compression was completely gone. But you've already checked those values, so I'm at a loss.

"Can you rule out leaks in the diesel supply? I heard hissing from my G2 because the injection pump, specifically in the area of the control cam ("throttle lever"), was leaking and running empty. However, this wasn't dependent on temperature, but rather on the fuel level in the tank."

Good luck!
Okay, please provide the German text you would like me to translate into English. I will only provide the translation.

Oh dear...
The confusion is truly perfect.
But as I see, you probably know a lot about that .

Yes... so, about leaks... how can I check for them?
I sprayed the entire engine compartment with leak detection spray.
And as a result, he couldn't find anything conclusive. I had only suspected it myself.
to see if air is whistling through the nozzles.
So, the strange thing about it is that if the fuel *really* flows back...
If it should happen, then it only occurs when the device is in a warm state.
Und das leuchtet mir irgendwie nicht ein. BECAUSE.
When the engine is warm, if I turn it off and then start it again after 10 minutes...
It's best to keep trying, but it might take some time for him to respond.
If I leave it like that until, for example, tomorrow morning, it will start up immediately.
Ah yes... the compression was measured when the engine was cold, I think.
I should measure that again when it's warm.
And that thing about the injection timing, so as I said, supposedly...
checked, and as far as I can tell, everything was fine, so they didn't have to do anything.
But I'm not entirely sure about that myself, because of the central screw on the pump.
"It was just as dirty as I had left it. Therefore..."
That's not quite Kosher. Or how do you spell that?
I'll go over everything again this weekend, if anyone...
If you have any other ideas, that would be great. I'm not sure how to proceed from here.

Regards, Acid.

It seems that in my case, the cold, thin oil was helping to seal the pistons in the morning, which resulted in a combustible compression.

When I stopped at a rest stop on the highway, the car wouldn't start anymore because the oil was too thin, and now the pressure was escaping past the pistons.

By the way, I had already experienced the "autobahn rest" phenomenon one or two years before the machine's final compression failure.

Okay, please provide the German text you would like me to translate into English. I will only provide the translation.