Technical Ducato 2.8 JTD crankshaft sensors

[Timmers522]

I'm working on a customers campervan based on a Ducato. It is a 2.8 JTD engine and i'm suspecting the problem is in the crankshaft position sensor. I've tried to find what the gap between the sensor and flywheel should be but i cant find it nowere in our technical data. Does someone know the distance it should be?

Attached picture is the sensor, the bolt holes are slotted and distance now is 0.35mm

 

[Communicator]

I'm working on a customers campervan based on a Ducato. It is a 2.8 JTD engine and i'm suspecting the problem is in the crankshaft position sensor. I've tried to find what the gap between the sensor and flywheel should be but i cant find it nowere in our technical data. Does someone know the distance it should be?

Attached picture is the sensor, the bolt holes are slotted and distance now is 0.35mm

Hi.
0.35mm is too small. Suggested range is 0.80 to 1.50mm, so try 1.15mm as mid range.

Attached are extracts from Fiat eLearn.

 

[bugsymike]

Does the rev counter kick/react when cranking?
As it mentions in eLearn, it controls rev counter also.

 

[Timmers522]

Hi.
0.35mm is too small. Suggested range is 0.80 to 1.50mm, so try 1.15mm as mid range.

Attached are extracts from Fiat eLearn.

I'll take a look at the eLearn data, thank you!

Does the rev counter kick/react when cranking?
As it mentions in eLearn, it controls rev counter also.

It shows the rpm on the dashboard and the van runs. It looks like it goes into the rev limiter at 4000 rpm. I tried some movement of the sensor and it varies from 2500 to 4000 rpm when the engine stops

 

[bugsymike]

I'll take a look at the eLearn data, thank you!


It shows the rpm on the dashboard and the van runs. It looks like it goes into the rev limiter at 4000 rpm. I tried some movement of the sensor and it varies from 2500 to 4000 rpm when the engine stops

Oh! Sorry I thought it was a non runner from first reading your post as Crank Sensors generally either work or don't, but you are getting some strange electrical feed/signal there, maybe another wire interfering, assuming the eLearn data isn't the total answer.
Is it possible some magnetic debris is affecting the sensor signal at flywheel/pulley?
4000 rpm sounds about right I never took those engines much above 3800, not necessary as they pull well from low down.

 

[Communicator]

Oh! Sorry I thought it was a non runner from first reading your post as Crank Sensors generally either work or don't, but you are getting some strange electrical feed/signal there, maybe another wire interfering, assuming the eLearn data isn't the total answer.
Is it possible some magnetic debris is affecting the sensor signal at flywheel/pulley?
4000 rpm sounds about right I never took those engines much above 3800, not necessary as they pull well from low down.

eLearn gives 4200rpm as maximum speed, with injection inhibited at 5000rpm.

I would consider 3500rpm high, as 100kph equates to about 3200rpm. Maximum power is at 3600rpm. (Source Fiat Technical Data Sheet for x244 2.8jtd.)

 

[bugsymike]

I agree most happy around 1500rpm, lots of torque.
I did reach 3800 rpm approx at 26 knots on the one I put in boat, though that was a 2.8idt and the guy holding the camera was even more shaky than me

 

[Timmers522]

Oh! Sorry I thought it was a non runner from first reading your post as Crank Sensors generally either work or don't, but you are getting some strange electrical feed/signal there, maybe another wire interfering, assuming the eLearn data isn't the total answer.
Is it possible some magnetic debris is affecting the sensor signal at flywheel/pulley?
4000 rpm sounds about right I never took those engines much above 3800, not necessary as they pull well from low down.

Sorry, should have been more clear! If 4000 rpm should be fine, the customer just has to deal with it!

eLearn gives 4200rpm as maximum speed, with injection inhibited at 5000rpm.

I would consider 3500rpm high, as 100kph equates to about 3200rpm. Maximum power is at 3600rpm. (Source Fiat Technical Data Sheet for x244 2.8jtd.)

Thanks, will tell that to the customer!

Thank you guys for the advice and data!

 

[Timmers522]

I did some more adjustments, first put the sensor at 1.00 mm. Engine runned good and i could take it up to +-4200 rpm, no "rev limiter" but it just didnt go higher in rpm. But when running stationairy, it randomly stalled.
Adjusted the sensor to 0.80 mm and that did the trick. It runs good up to 4200 rpm, no random engine stalls or "rev limiter" sounds.

Again, thank you for the advice and data!

 

[Milostoofast]

Does the rev counter kick/react when cranking?
As it mentions in eLearn, it controls rev counter also.

I have non runner. First crank starts for a second and dies. Then just cranking and the revs go up.

 

[bugsymike]

I have non runner. First crank starts for a second and dies. Then just cranking and the revs go up.

It may be best to start a new thread for your vehicle as it can get confusing.
But as a rough guide if rev counter is reacting then normally not a crank shaft position sensor.
If it fires and then dies, I would be tempted to check for a good fuel supply with no air in it, however there are many other things that can be an issue.
Any chance of a good diagnostic code read as a guide in the right direction, preferably one that reads live data as things like injection pressure, as if less than around 230 Bar engine will not fire any way.
I assume correct ignition chipped keys and immobiliser light comes on and then goes out with ignition as normal.

 

[Milostoofast]

It may be best to start a new thread for your vehicle as it can get confusing.
But as a rough guide if rev counter is reacting then normally not a crank shaft position sensor.
If it fires and then dies, I would be tempted to check for a good fuel supply with no air in it, however there are many other things that can be an issue.
Any chance of a good diagnostic code read as a guide in the right direction, preferably one that reads live data as things like injection pressure, as if less than around 230 Bar engine will not fire any way.
I assume correct ignition chipped keys and immobiliser light comes on and then goes out with ignition as normal.

Thanks. i will start a new thread. I just thought its an easy fix. Thanks once again.