TD4 stiff when reversing..

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Stuart o

New Member
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4
Hi I have a 2002 TD4 with 30,000 miles and notice that when reversing on hard lock it seems to stiffen up as if the diff is tight - is this normal ??:confused:

Thanks
 
they do reverse funny feels like your braking a bit of this is normal...you can test if your vcu is ok by chalk marking it across the join drive it around and the marks should move away from each other. the otherway is mark the diff jack up a rear wheel and turn it by hand out of gear it will be extreemly stiff but you should be able to move it...hope this helps cartman690...:)
 
well thanks guys - getting a bit paranoid here.....:eek:

Stuart
Hi Stuart,
A bit paranoid is probably not paranoid enough!!! Your symptoms sound like a classic siezed (or siezing) VCU.
The VCU test should be done in gear, front wheels on the ground,(to lock the front half) and try to steadily (no jerking now!!) turn one raised back wheel. (hand brake off)
When you prove your VCU is siezed, drop the front and rear prop shafts, plus vcu and harmonic balancer, and enjoy a smooth quiet non self destructing 2 WD car!!
Cheers
Ian Hughes
Tassie
 
Hi I have a 2002 TD4 with 30,000 miles and notice that when reversing on hard lock it seems to stiffen up as if the diff is tight - is this normal ??:confused:

Thanks
they all do it to a lesser or greater degree. mine was quite stiff but had new tyres put on the other day and now it still does it but it's not as bad.:confused:
 
they do reverse funny feels like your braking a bit of this is normal...you can test if your vcu is ok by chalk marking it across the join drive it around and the marks should move away from each other. the otherway is mark the diff jack up a rear wheel and turn it by hand out of gear it will be extreemly stiff but you should be able to move it...hope this helps cartman690...:)

Funnily enough I tried this on my 51 Td4 ES yesterday, and it was stiff but I could turn it very slowly. Trouble is I don't know how stiff it *should* be.

As ianh1 says, shouldn't this be done with the car *in* gear, otherwise you can just spin the whole transmission? Stupid thing is, I can't remember if it was in gear or not. I guess it was otherwise it would have been easier to turn, wouldn't it?
 
Funnily enough I tried this on my 51 Td4 ES yesterday, and it was stiff but I could turn it very slowly. Trouble is I don't know how stiff it *should* be.

As ianh1 says, shouldn't this be done with the car *in* gear, otherwise you can just spin the whole transmission? Stupid thing is, I can't remember if it was in gear or not. I guess it was otherwise it would have been easier to turn, wouldn't it?

I guess ianh1 said "in" gear to have the front part of the transmission blocked and have only the rearpart moving slowly through the vcu resistance. But what about an autogearbox with no solid contact between the engine and the gearbox(front part of xmission) via the clutch ?? If a vcu is seized (blocked) with such an autogearbox it is possible to slowly turn the rearwheel as there is no firm connection between the engine and the gearbox, the oil in the box might do the same as the vcu does ??
Is this b..s.. ??:eek: :eek:
 
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