Kurbelwellenlager-Schrauben: Anzugsdrehmoment messen | Posts 16+

"I'm having it chipped right now to about 130 kW. And those loose KW mounting screws are quite common on the AXG engine. I think I'll put in reinforced KW mounting screws (and leave the connecting rod bolts alone)."

The screws themselves aren't the problem; the issue is the insufficient tightening torque.

These screws (same part number) are used in a large number of TDI engines, including the 1.9L PVE and PD models, as well as the Crafter (which uses the same engine block), etc.
In all den anderen Motoren werden die mit 65NM + 90° angezogen, nur nicht im T4, LT und Audi 100/A6 C4, und ausgerechnet da halten sie nicht, komischer Zufall, gell?

So, if you want to do it right -> hone the cylinder bore and tighten the screws with 65 Nm plus an additional 90 degrees.

Okay, but why is it like that with the T4 and others?

And why bother to check it in the first place?

Das musst schon den entsprechenden Ingenieur fragen.
Perhaps because the engines initially had the lowest displacement for TDIs. The versions with more power (AHY/AXG and AEL) weren't available until years later, so people probably didn't even think about that anymore, I have no idea...

Because the clearance in the storage aisle is too small for a 65-ton machine with a 90-degree turn, the crankshaft is difficult to rotate.

Wow! This might also explain the following story from the T4Forum:

Quote:

This week, I had my workshop install the ARP head studs from Bar-Tec as part of an inspection. The current problem is that after tightening the head studs according to the instructions, the crankshaft no longer turns.

"Does this necessarily lead to the conclusion that..."

Quote:

The ARP installation instructions state: first, hand-tighten the studs, then apply the included paste to the upper threads, contact surfaces of the washers, and nuts, and tighten in three stages (27, 54, and 82 Nm)

.
"...that there's always a risk that the crankshaft will seize up later when using ARP bolts?"

The crankshaft always seizes when the tightening torque is too high, and whether it's ARP bolts or OEM screws makes no difference. }

As far as I can tell -- I mean, considering that the Arp bolts are tightened to 82 Nm (instead of the standard 60 Nm), shouldn't we also expect some clamping of the crankshaft (as has apparently happened over there on the T4F)?

Will a slightly stuck crankshaft eventually become free again, or will the problem always progress towards bearing damage?

Kurt.M wrote:

As far as I can tell -- I mean, with the Arp bolts, which are tightened to 82 Nm (instead of the standard 60 Nm), shouldn't we also expect some clamping of the crankshaft (as has happened over there on the T4F)?

There are different experiences regarding this. However, the torque values aren't directly comparable in general because they involve a bolt versus a nut, and ungreased versus greased assembly.

Kurt.M wrote:

And will a (slightly) sticking crankshaft become free again, or will it consistently develop towards bearing damage...? No one can answer that with certainty, and I wouldn't want to try it on my engine. }

Okay, so I should tell the workshop to tighten the ARP bolts gradually, as prescribed, and to check after each bolt whether the crankshaft still rotates freely.

If the quick-release mechanism is stuck, do not tighten the corresponding bolt further (it would be undesirable, but there's no other way in that case).

Is that correct?

And regarding the "de-cluttering":

TDI-GTI-4-Motion wrote:

Das was du wegdremeln musst, ist das Gegenstück zur Dichtfläche der Ölwanne. {M Could we not grind the nut finer instead?

Kurt.M wrote:

Could we not instead grind the nut thinner?

It will definitely help, but it still won't work without some modification to the flange.

OK, thank you.

Does the screw head protrude past the flange?
Can a pipe wrench be modified to fit window hardware?
If not, go back to the beginning.
hg
Herbert.

"Embedding a window into the socket wrench is a good idea. I'll check with the workshop about that!"