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Old 26-01-2009   #1
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Ducato rear wheel tracking, 2.8jtd, 3850kg.

Hi All,

I have been on the internet to try and research a problem with my Ducato and I was directed to this forum. So I hope you can help and don't mind me asking a question on my first visit. I do plan to remain.

I have a Ducato 2.8jtd based Hymer motorhome. It was pulling to the left so we decided to have the tracking checked. We found both front wheels out to the right so we corrected them with laser measurement, so that they were absolulely straight ahead with the steering wheel straight ahead. However, I now need about 25 degrees steering input to the right to drive down a straight and level road. ??

So we decided to check the rear wheels and found both wheels out by a long way and both pointing to the right. The rear left wheel is "toe in" and the rear right wheel is "toe out". Another way of looking at this would be that the whole axle is pointing right, ie the rear left wheel is further foward than the rear right wheel. This is having the effect to pull the rear of the vehicle out to the right and therefore the required steering input to the right to travel staight. On following the vehicle it can be seen to "crab" down the road, and you can see down the left hand side of the van.

So we thought we would adjust the rear axle but can find no way of adjusting it? I am amazed that there is no way of adjusting the tracking on the rear wheels. Surely there is a way to set up the tracking on the rear axle? How else am I going to make this van drive straight, this must be a safety issue??

Please help and thank you to those that reply.

Triple7.

PS The van has not been in an accident and the chassis appears undamaged and unrepaired. SO I'm confused.
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Old 26-01-2009   #2
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Re: Ducato rear wheel tracking, 2.8jtd, 3850kg.

Welcome

Some more details might help if you can (year etc)
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Old 26-01-2009   #3
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Re: Ducato rear wheel tracking, 2.8jtd, 3850kg.

Ops.......good point.

It's a 2.8JTD, the 03 to 06 shape, however first registered Jan07.

Hymer C644 motorhome which is coachbuilt, ie has the Ducato cab and full chassis. Max Vehicle Payload 3850kg.

The rear axle is a cross bar with a wheel on each end and has a 'single leaf' leaf spring each side.

Is there anything I have missed??

Ta.
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Old 26-01-2009   #4
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Re: Ducato rear wheel tracking, 2.8jtd, 3850kg.

colour?


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Old 26-01-2009   #5
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Re: Ducato rear wheel tracking, 2.8jtd, 3850kg.

Silver........
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Old 26-01-2009   #6
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Re: Ducato rear wheel tracking, 2.8jtd, 3850kg.

I'm afraid I only have limited data for front wheels
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Old 26-01-2009   #7
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Re: Ducato rear wheel tracking, 2.8jtd, 3850kg.

Thanks,

Unfortunately that's my worry, which is that it's not fixable or adjustable. I am totally amazed! I can't help feeling its not the best design.

I note both leaf spring mounting brackets are not adjustable and bolt directly to the chassis. Furthermore the axle crossrail clamps cannot slide forward or backward on the leaf spring as there is a locating lug on the spring and corresponding hole on the fixing plate. This is confusing.
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Old 26-01-2009   #8
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Re: Ducato rear wheel tracking, 2.8jtd, 3850kg.

Here is a picture:-


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Old 27-01-2009   #9
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Re: Ducato rear wheel tracking, 2.8jtd, 3850kg.

did you buy it new?
if not, maybe it has been in an accident?
if its an '07 then try your fiat dealer, the chassis is under warranty and they should have all the tracking data needed.
i didn't think that the rear was adjustable so if you do have a rear alignment problem then maybe something wasn't assembled correctly at the factory.
the dealer should have access to all of the chassis alignment specifications which are used to check major body repairs.
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Old 27-01-2009   #10
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Re: Ducato rear wheel tracking, 2.8jtd, 3850kg.

Hi weatherforcast,

No, it was 1 year old when I bought it.
No, its not been in a accident since i've had it, and knowing the previous owner I am pretty certain its never been in an accident. The chassis looks perfect, no witness marks, no repair and no overspray. Furthermore, the coachbuilt part of the motorhome has no damage or repair evident.
Having already spoken to a local fiat garage, for some unkown reason, they are not being very helpfull? The service manager is always in a meeting and they have not returned any of my calls?????
I have a case number with Fiat customer service and hopefully they can help, but I somehow doubt it. I suspect this wil be filed in the 'too difficult' pile.
It was first registered 6Jan07 so has just run out of warranty, so can see all fiat outlets running a mile. However, if this is a manufacture problem then I will need all the information possible to chase them.

I think I will have to try another fiat dealer, but I'm praying someone on here knows or can help.

Thanks.
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Old 27-01-2009   #11
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Re: Ducato rear wheel tracking, 2.8jtd, 3850kg.

OK firstly you need to get a proper printed four wheel alignment report carried out at your expense. Then you need to get the distance checked between the centre of each sides wheels, so ns distance maybe longer than the os (shorter leaf spring or broken location pin on rear axle). It is very difficult to prove that this is a manufacturing fault due to the age of the vehicle and the incomplete history (2nd owner) Finally (and I hope this isnt the case) some vehicles were damaged during the floods of 2007 and were written off and had no warranty. These were bought by some individuals and sold as good units after being dried out and cleaned, these have no warranty at all.
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Old 03-03-2009   #12
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Re: Ducato rear wheel tracking, 2.8jtd, 3850kg.

Check out the spings, has one been replaced? Sometimes leaf springs ae a different length from the locating pin to the front and back bush centre, if one is the wrong way round could cause your problem.
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Old 10-03-2009   #13
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Re: Ducato rear wheel tracking, 2.8jtd, 3850kg.

Hi NumanR

Here is the computerised 4 wheel tracking report, just look at the thrust angle! :-



and here is the wheelbase length measurement from the same computer report, 18mm difference!:-



Fiat have since asked for photos of the rear suspension and I think this one showing that the axle clamp is not centred on the suspension bumb say's it all. This is the right axle and forward is to the left. The right side is totally under the bumb stop. Fiat have now asked that the van goes in to have the rear suspension stripped down and all leafs measured.





Hi lunarmotor,
I think you are absolutly correct, however none of the leafs have ever been replaced, or removed?

Thanks all for the advice and I'm hoping that the end is in site, but boy this is taking months to get sorted. I will let you know. Triple7.
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Old 10-03-2009   #14
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Re: Ducato rear wheel tracking, 2.8jtd, 3850kg.

Yes, taking a long time, but it looks like you are making progress and Fiat is being cautiously accommodating.

PeterM
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Old 13-03-2009   #15
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Re: Ducato rear wheel tracking, 2.8jtd, 3850kg.

Comparing the photograph with the drawing of parts previously posted, I am sure that you can see the 'pip' on the spring, not aligned with the hole in the locating plate: you can see the slight bump under the plate, I am sure.

Harvey
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