BAd Vibration

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My IRD bearings are on their way out! That rumble is now apparrent over the noise from my mud terrains, it is throttle dependent, I can diagnose mine by grabbing the joint that comes out of the drivers side of the IRD, if it's sloppy and moves around you have an expensive problem! Mines got a new vcu and bearings already, easy way to diagnose that is to remove it and drive it, you can then spin the bearings by hand to check for roughness and noise:) hope that helps


DD

how much movement would you say was sloppy. I can grab my driveshafts and i can feel play but thought that was just normal joint wear. I can feel slight vibrations and a definite humming around 65-75. Thought i would just leave it till it got worse though...
 
Just praying that it wasnt the ird.as above how much movement is too much and in what direction?thanks
 
Right update.checked prop and vcuand no play.bout 1or 2mm side to side play on drive shafts from ird.this ok?
 
right.the problem doesn't start immediatley.Have to drive hard for a few miles or else cruise at motorway speed for 15-20 miles before it starts.def rev related as leave off the throttle and it stops.Also stops if you accelerate for a bit too?
 
right.the problem doesn't start immediatley.Have to drive hard for a few miles or else cruise at motorway speed for 15-20 miles before it starts.def rev related as leave off the throttle and it stops.Also stops if you accelerate for a bit too?

VCU on it's way out !! ;)
 
ah crap :( so do they really take out the drivetrain when they fail?am i ok to drive it once it isn't vibrating?
 
ah crap :( so do they really take out the drivetrain when they fail?am i ok to drive it once it isn't vibrating?

Yes they really do destroy the IRD and rear diff!! The problem is they can seize solid joining the front and rear together with a solid link which overloads the whole system!! Remove the props as a temporary measure untill you can get a new VCU!!
 
right so.i'll take the prop off at the weekend and see if that fixes it.if it does i'll look at the vcu.if it doesn't then IRD?Would these be intemittent though and load dependent?Drove to work keeping it under 60 today and there was no problem.

Did you ever take the prop off?
 
the prop is coming off today so i dont know if i want it to fix the problem or not really.Dont like the thought of the expense of a VCU but an IRD box would be much worse
 
You are looking at around £350 for the VCU + a couple of hours labour if the garage knows what they are doing? Obviously if you do the spanner work yourself then it's just the part cost to worry about. I you don't do the VCU then the IRD "WILL" fail which will cost 3 X as much to fix!!
 
Why is the VCU a few hours of labour?Is it not a bolt off bolt on job with the prop out? Excuse my ignorance
 
Why is the VCU a few hours of labour?Is it not a bolt off bolt on job with the prop out? Excuse my ignorance

I did say a couple of hours ;) The last VCU I did took 1 1/2 hours start to finish!! The new VCU will come without support bearings so those will need to be fitted first. It can take a couple of hours for the whole job especially if the prop splines are stuck fast. If the props are already off then it's much faster as it's a simple re-assembly job!!
 
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