IRD, Diff or Both?

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Land_girl

Land_girl

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Properly kicking myself here... my front tyres were completely shot so decided a new set of tyres were needed. Couldnt afford the whole lot in one go so thought i'd get the rears done first (as recommended)... mobile guy turns up to do them. Asked him to put new ones on the rear and the old (half decent ones on the front). Tells me he can't do it as he only has one jack. So he puts them on the front. My plan was to get the rears replaced a few days later with the same brand/tyre... 2 weeks has passed... haven't had chance to get the rears replaced.. now I have horrendous noises, I assume, from the drive train? IRD? Diff? I'm not entirely sure.
Which part am I likely to have f**ked by not running all 4 tyres the same?
Lots of crunching/grinding driving slowly in reverse (though it has always done that just not as bad), sounds like brakes grinding on left hand bends etc.
Just need to know the most likely part to have been shattered with my idiocy!
 
Actually the tyre fitter is the moron here. If he used his head and lifted the FL1 by the front jacking point, then the rear will lift off the ground too, as long as he lifted it high enough.

However now you need to sort the resulting damage. It's most likely to be the IRD which had thrown in the towel. When new tyres (possibly different to the rear?) are fitted, it puts tremendous strain on the IRD crown wheel and pinion.

So I guess the IRD is at fault.
 
Nodge68 said:
Actually the tyre fitter is the moron here. If he used his head and lifted the FL1 by the front jacking point, then the rear will lift off the ground too, as long as he lifted it high enough.

However now you need to sort the resulting damage. It's most likely to be the IRD which had thrown in the towel. When new tyres (possibly different to the rear?) are fitted, it puts tremendous strain on the IRD crown wheel and pinion.

So I guess the IRD is at fault.
Click to expand...
Thanks. You've confirmed what I suspected.
It's been suggested to me that I remove the prop as a prevention of further damage. And check the IRD oil. Is there any other suggestions?
 
Nodge68 said:
That's the best course of action to take for the time being.
Click to expand...
Much appreciated.
I plan to contact Bell engineering asap, I've heard nothing but good reports of them and their work (though not looking forward to the 7 hour round trip).
In all honesty I suspect the IRD was on its last legs anyway (152k miles and as far as I know it's never been changed/maintained)... not something I wanted to do right now but... there we are. Thanks for your help.
 
I expect the VCU has begun to stiffen, that coupled to new front tyres is why the IRD has failed so quickly.

This could well have been avoided if the tyre fitter used his head, although that's not an ability they possess from my experience.
 
Nodge68 said:
I expect the VCU has begun to stiffen, that coupled to new front tyres is why the IRD has failed so quickly.

This could well have been avoided if the tyre fitter used his head, although that's not an ability they possess from my experience.
Click to expand...
Is it possible the VCU could have been compromised as well? I replaced the VCU last June... gawd! I hope not!
 
Land_girl said:
Is it possible the VCU could have been compromised as well? I replaced the VCU last June... gawd! I hope not!
Click to expand...

If the VCU is that new, then no, I'm sure it'll be fine. It was doing what it was designed to to, which is transfer drive from one end of the propshafts to the other.

So for now. Remove the propshafts and VCU. Drain the IRD of oil to get an idea of its condition (make sure you undo the filler plug before the drain plug though;) )
Refill with fresh 75w90 oil and use it until you can afford to replace the IRD. Oh and don't forget to tell your insurance company, as removing the propshafts is a modification. ;)
 
Nodge68 said:
If the VCU is that new, then no, I'm sure it'll be fine. It was doing what it was designed to to, which is transfer drive from one end of the propshafts to the other.

So for now. Remove the propshafts and VCU. Drain the IRD of oil to get an idea of its condition (make sure you undo the filler plug before the drain plug though;) )
Refill with fresh 75w90 oil and use it until you can afford to replace the IRD. Oh and don't forget to tell your insurance company, as removing the propshafts is a modification. ;)
Click to expand...
Filler plug: noted.
Insurance: noted!
Thanks again.
 
Prop off and a sample of IRD oil taken... looks grubby???
20190706_114913.jpg
 
Wow! Just took it for a drive! Drives lovely! And what I suspected previously may have been a cracked chassis (with the crunching and creaking) is no longer happening since removing the prop and VCU.
Drove about 15 figure 8 forwards and backwards... silence! :)
 
GrumpyGel said:
That oil looks OK to me, did you drain it all? Although, did all those bits come out with the oil?

Where did you get your VCU from?
Click to expand...
Yes lots of 'bits' in the oil. No didn't drain it... that's a job for tomorrow.
The VCU was from Bell Engineering.
 
Looks like there's lots of flecks in the oil. You'll probably find the oil is full of metal particles when you drain it out. Don't forget, remove the fill before the drain, although I guess you've got the filler plug out already.
 
Nodge68 said:
Looks like there's lots of flecks in the oil. You'll probably find the oil is full of metal particles when you drain it out. Don't forget, remove the fill before the drain, although I guess you've got the filler plug out already.
Click to expand...
I undid the filler before draining out the 'sample' (as pictured) then did it all back up... I need to go get some new oil and a container for the old oil tomorrow before I completely drain the IRD. And find a way of refilling as the filler hole is in a slightly awkward place to just pour fresh oil in direct from a bottle.
 
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