Freelander 2.0DI L-Series stutters above 2700 rpm

I have been reading here for some time now and am very enthusiastic about the expertise of the forum participants.
Now I have a problem with my Freelander 2.0Di L-Series that I don't know what to do with.

At around 2700 rpm the rev counter twitches upwards and then the engine starts to stutter, but then runs normally again from 3000-3200.
Sometimes the error crankshaft sensor is stored implausibly in the engine control unit.

What have I checked or replaced?
1. filter in the tank
2. fuel line
3. diesel filter
4. pump bellows
5. crankshaft sensor replaced 2x.
6. needle stroke sensor / nozzle
7. cleaning of VP37 flow divider
8. Complete VP37 injection pump
In between the two belts were changed.
As I suspected that the clutch disc might be out of balance, it was also replaced.
The error does not occur at standstill with the clutch pressed. If no gear is engaged and I release the clutch and accelerate up to 2700 rpm, the stuttering starts up to about 3000-3200 rpm. After that, the engine continues to run normally.

Now my question to the experts.

Is it possible that the gearbox has a damaged bearing that causes such a fault?

Could the crankshaft have axial play and the flywheel is vibrating?

Could the cable (shielded because PWM) be defective and cause such symptoms?

I would be happy if anyone else has any ideas. Or even had this problem before and knows the solution.
Thanks for reading and greetings from the sun of Fuerteventura.
Michael

Could be the cabling from the crank position sensor, or maybe even an ECU problem (but unlikely). Any signs of damage to the loom?

Another thing that springs to mind is the timing wire of injector 1, that has been known to cause problems. I could understand it making the car stutter, but not making the ECU think the revs have risen ('twitched up').

The twitching up does smack of crank sensor, but 3 different ones doing the same thing doesn't seam right - so you'd think it was either the pickup for the sensor or the cabling to the ECU.

As you can probably guess, I'm no expert - just trying to understand why the car might do that from what I know. You appear to have a better understanding.

Hola,

I don't see very many possibilities now.
In any case, I will replace the cable and test it.
In an engine talk forum I found the plausible explanation that BMW only uses the upper half-shell of a single crankshaft bearing as a thrust bearing in many engines. This seems to lead to a lot of engine damage. Too much play in the shaft can even cause the chain to run at an angle and break very often. The fault only occurs in manual cars because the clutch loads the flywheel when it is actuated.
In the Rover L-series, the axial bearing is also designed as an upper half-shell and could lead to the symptoms (crankshaft sensor and twitching rev counter).

Has anyone here ever disassembled the L-series?

I have now decided to install a replacement motor from the scrap. I had already rebuilt the high pressure pump from this engine but it did not change the stuttering. Basically, the engine makes a good impression, even though I don't know how many kilometres it has run.

Anyway, today I removed the gearbox (the clutch still looks very good) and measured the axial play. It feels like a lot. The clacking noise when moving the crankshaft is also audible. But I only measured a play of 0.25 - 0.28mm. According to the workshop manual, the clearance may be between 0.03 - 0.26mm. When I have the old engine out, I will measure the axial play of the shaft.

The error is found.

The axial play of the crankshaft is borderline approx. 0.28mm. According to the workshop manual, however, there should only be 0.003 -0.26mm.
So I first ground down a sensor a little and installed it deeper (i.e. closer to the flywheel) with a spring. The spring ensures that the disc can push the sensor back without destroying it (knocking it off).
This ended with an emergency run and shaking over the entire speed range.
Then I installed a sensor with slightly more distance (0.15mm washer). Now the car runs beautifully over the entire rev range.
We'll see if it stays like this or if I have to change the crankshaft thrust washers.

Greetings from the sun
Michael

Furteventura4x4 said:

The error is found.

The axial play of the crankshaft is borderline approx. 0.28mm. According to the workshop manual, however, there should only be 0.003 -0.26mm.
So I first ground down a sensor a little and installed it deeper (i.e. closer to the flywheel) with a spring. The spring ensures that the disc can push the sensor back without destroying it (knocking it off).
This ended with an emergency run and shaking over the entire speed range.
Then I installed a sensor with slightly more distance (0.15mm washer). Now the car runs beautifully over the entire rev range.
We'll see if it stays like this or if I have to change the crankshaft thrust washers.

Greetings from the sun
Michael

Click to expand...

A very "Land Rover" fix

Presumably the 'resonance', or what ever, at that rev range pushed the sensor and pick up out of range.

If the engine is performing well, then all is good. I wonder if it will damage the crank itself though? Although if the alternative is to ditch the engine, you may as well run with it and see how things turn out.

I'd just change the bearings, which will put the crankshaft end float back in tolerance.

Thanks for the info.

Can I change the axial bearings from below without removing the crankshaft?

[ATT