NW Adjustments: More Questions Than Answers

Hello fellow forum users,

Yesterday, in my search for the missing horsepower...
It's trying to control the north-west setting of my Bora.
First, thank you to Ulf for the meticulously accurate instructions 'Setting the timing and PD elements on the 1.9L PD engine.' They are truly user-friendly!

Despite this, more questions have arisen than answers have been found, and I am seeking expert advice.
Expert advice needed from forum members.

One problem was that the 6 mm drill bit was getting stuck in the NW wheel at the designated position.
It didn't sink in very far (a 5.5-inch lure went in much deeper).
Although the drill bit is usually quite firmly inserted,
'It was impossible to get rid of that lingering feeling (a small one). By 'the feeling,' I don't mean...'
'It's not that the drill would have wobbled, but rather that the drill can move, even if only minimally.'
If you carefully move the rear wheel with the motor (manually, while lifting the front wheel),...
My suspicion falls on the workshop of the previous owner; perhaps someone there damaged the long hole, or maybe I had unrealistic expectations regarding the 'secure fit' of the centering tool. In any case, the drill shaft has a diameter that is very slightly less than 6 mm.
and it's quite smooth, so that's probably not the issue.

So, I've repeatedly encountered the same issue in three (successful) attempts: a problem that occurs when reversing the motor's direction.
'Located and marked, and the hole on the transmission side was photographed with the TDC (Top Dead Center) mark visible.'
At least the variation between individual measurements was small (approximately 1 mm).
That is to say, if my measurement is fundamentally reliable, then it will have very little scatter.
According to my measurement, the NW is indicating a late arrival.

Image OT brand to forward marking position:
http://members.aon.at/835935/CIMG0459_s.jpg

For informational purposes, I also intentionally misaligned the hole twice, by a quarter turn.
It was set up again and photographed. In both instances (almost exactly the same), it was positioned in a particular way.
protruded approximately 3-4 mm beyond the occlusal plane. If I have understood the instructions for the test correctly, my results seem to be within the expected range.
aus richtigem und falschem Messen zusammen, nämlich dass die NW auf spät steht. BI'm sorry, I can't translate that. It appears to be incomplete or nonsensical. Please provide a complete and coherent text for me to translate.
The adjustment appears slightly earlier when measuring from the backward rotation.

F1: Do you find my measurement to be useful?
Does the difference between the correctly and incorrectly determined NW position make sense, or did I have too much leeway?

Unfortunately, I couldn't find any indication anywhere as to where the hole is located on the transmission side.
The counterpoint to the mark on the clutch disc is, I believe (hopefully correctly).
that it simply refers to the center of the hole.

If the measurement is correct: In my opinion, the NW (North West) is positioned 5-6 mm too late.

F2: By how many degrees is my camshaft retarded (or, how many millimeters does one degree correspond to - I don't know the diameter of the pulley)?

Upon closer inspection of the NW wheel, I also noticed that the NW wheel is in its possible...
The adjustment range seems to be set very close to the possible early limit (see picture).

Image: Wave pattern wheel with a very limited adjustment range, as shown previously.
http://members.aon.at/835935/CIMG0454_s.jpg

I'm puzzled by the comparison with the image in the instructions, where the rear wheel seems to be pointing in both directions.
it has almost the same amount of room for adjustment. So, that's it for my questions for today - I know this is annoying .

F3: Could it be that the NW (presumably a component or device) is incorrectly assembled, causing it to be so heavily biased towards the limit of its adjustment range?
Is the timing belt properly aligned, or is it misaligned by one tooth?

F4: Is it possible for the timing belt to stretch that much in 15,000 km, or does this indicate something else?
Okay, and another problem with the timing chain mechanism (although everything was replaced at 58,000 km, you never know - it's an AJM engine).


Sure, here's the translation:

'Thank you in advance!'
herwig

herwigw wrote:

One problem was that the 6 mm drill bit didn't seem to want to penetrate very deeply into the NW wheel at the designated marking position (a 5.5 mm bit went in much further).

As soon as the 6mm drill bit clearly goes in further than it does in an incorrect NW (Nominal Wall thickness) position, you have found the correct centering position – even if there's a slight gap compared to the 5.5mm drill bit.

Quote:

Unfortunately, I couldn't find anywhere a clue as to where the corresponding point to the marking on the clutch disc is located on the hole on the transmission side; I assume (hopefully correctly) that the center of the hole is meant.

"On mine, there's a small, 'cast-in' tip visible in the aiming aperture, located about halfway down the hole."
If you don't have it, I can only guess at the center of the hole.

Quote:

If the measurement is okay: In my opinion, the NW (North West) is 5-6 mm too late. F2: By how many degrees is my camshaft retarded (or, how many millimeters correspond to one degree - I don't know the diameter of the pulley)?

Probably around 2-3° KW, similar to what I had from the factory -> a correction is worthwhile .

Quote:

Upon closer inspection of the NW wheel, I also noticed that the NW wheel is in its possible... The adjustment range seems to be very close to the possible early detection limit. What surprises me is the comparison with the image in the instructions, where the NW wheel seems to have almost the same amount of adjustment space in both directions.

It seems to be misleading. In reality, mine only has very little room to move forward when the NW setting is correct, and about 3 or 4 times more room to move backward.
If the NW gear were shifted one tooth earlier, the long hole would likely be in the middle range when the NW is properly adjusted.

Quote:

F3: Could it be that the NW is incorrectly assembled internally, given that it's positioned so asymmetrically at the limit of its adjustment range? Is the timing belt

misaligned by a tooth?
Please provide the German text you would like me to translate into English.

Probably around 2-3° KW, similar to what I had from the factory -> a correction is worthwhile .


Thank you, Ulf!

I'm starting to feel hopeful that I'm on the right track!

If I'm hesitant about re-registering:

Will the screws on the NW wheel withstand multiple tightening and loosening cycles? There have already been some posts on this topic, suggesting that it's a delicate matter (only tighten when the engine is cold, strictly adhere to the specified torque, and avoid disturbing the central screw).

Did you replace the screws during your attempts?

Best regards,
herwig

herwigw wrote:

Will the screws, specifically the three screws on the NW wheel, withstand multiple attempts at tightening and loosening?

IMO, yes, as long as you approach it with common sense and a bit of mechanical intuition.

Quote:

Did you replace the screws during your attempts?

No.

Will the screws, specifically the three screws on the NW wheel, withstand multiple attempts and repeated tightening and loosening?
IMO, yes, as long as you approach it with common sense and a bit of mechanical intuition.
Did you replace the screws during your attempts?
No.

I'm already curious to see how this will work.

Thanks in advance, I'll definitely let you know how it goes once I try it next weekend or the one after.