TD5 Fan Hub Idler Bearing

[davros]

Correct me if I'm wrong in these steps (I have removed the viscous fan and need to get to the bearing in the timing cover).

1) Use 12mm allen head socket to unscrew hub from shaft (any bright ideas to hold hub?)
2) Remove circlip retaining bearing
3) Use hub as a puller with some wood behind it whilst tightening 12mm allen socket, to draw out bearing
4) Slip, graze knuckles, dislodge bonnet stay which allows bonnet to fall on head
5) Once removed, press bearing off shaft
6) Press new bearing onto shaft
7) In a bag, freeze new bearing, with attached hub to allow something to tap on when refitting
8) Warm housing with torch/hot air gun
9) Push in bearing and shaft then remove hub and replace circlip
etc...
10) Move on to fixing the water pump, another broken thing discovered whilst looking for the still unknown cause of an odd vibration/rumble at 2250rpm...

Dave

Now I see why they call it a "Discovery" - for all the time needed to discover faults!

[alien]

Sounds about right to me, it's about what I did.

To hold the hub I bought 2 bolts and screwed into hub and held with screw driver or a bar.
Then I made a tool up, used on damper too.
http://www.aulro.com/afvb/attachments/discovery-2/18505d1252225169t-disco-2-marble-rattle-pict1279.jpg (http://www.aulro.com/afvb/attachments/discovery-2/18505d1252225169-disco-2-marble-rattle-pict1279.jpg) Just angle iron drilled and cut to fit both hubs.

When refitting I used the old bearing to tap new one in, no need to fitt the hub as shaft pressed in from rear.
I used my vice as press jaws and a knokometer to move shaft, its not that tight of a fitt.

Cheers, Kyle.

[davros]

Thanks mate,
This was done on the vehicle?

Cheers,


Dave

[alien]

Thanks mate,
This was done on the vehicle?

Cheers,


Dave

Done with timing case on the bench.

I know it's been done in car, bit hard to do the circlip if radiator still fitted from what i've read.

Cheers.

[roverspec]

check your engine mounts they really make it vibrate at revs. they usually look ok but give them a quick check by lifting motor and looking for cracks.

cheers

carla

[davros]

Thanks Carla,
I think I will do, whilst everything is in bits!
I suspect it might be a prob as the flexible down-pipe section on the exhaust has packed it in, could be from a busted mount?
I plan to lightly jack the the motor up. Is one mount more likely to be busted than the other?

Cheers,

Dave

[davros]

Thanks Alien!
I got it out no worries with some 90degree cirlip pliers. I now wonder how easy it will be to put in the replacement!

The part number is SKF bearing 3206A-2RS1TN9/C3MT33 (phew!). There are some similar bearings available after-market from SKF but the last "C3MT33" means it is a high speed bearing with a minute tolerance allowing it to be pushed onto a shaft or into a housing, so a non "C3M" ie just "MT33" is not the go, it will get too tight. Apparently...

Dave

[roverspec]

the driver side is harder to see and the motor torques that way, so it takes alot more of that strain.

give that a go, also have a look at your unijoints.

good luck

carla

[davros]

Thanks,
Done the unis and the Hookes joint centre bearing. The vibration I have is always at the same revs, rather than speed - even in low range - so I suspect a motor or ancillaries issue. I did give it a brief 50m run with the serpentine belt off but I think the vibration was still present; I wasn't game to investigate further for fear of cooking the motor.
Cheers,

Dave

[roverspec]

Another thought if its the same with the belt off, have a look at the Harmonic Balancer. Its is rare but the rubber sleeve could be perished.

Can give that a go, you can tell just by looking at it, the rubber will be atarting to push out.

It dosn't too serious, its probaly just something so unexpected.

carla.

[davros]

Wow. When I used a heat gun on the housing and left the bearing in the freezer for a few hours, plus a smear of moly grease, it just slid straight into place! Easy done. Quite relieved actually!
Now to check those mounts and the balancer.

Thanks all!

Dave