Rear wheel bearings

[John Cohen]

Hi all I am building a Tornado 40 . I have put the rear uprights together with new bearings into the bearing carriers . packed with grease new seals MK2 grenada hubs . and new drive shaft end . after putting it all together not tightend to tourque yet . And the drive hubs are really tight and difficult to turn .??????? would any body have any ideas why this might be ... Is there supposed to be a spacer in there somewhere ??

Thanks guys John..:sad:

 

[Jason Lycett]

Hi John. Couple of possibilities I can think of. The wheel bearings ( I think from most manufacturers ) are a 2 piece design that need torquing up to bring together in the housing. Maybe they are loose in the bearing housing.
You might want to try assembling the Disc with the drive flange and nut and carefully put some torque on it. This may have the affect of correctly seating the bearing in the housing.
If you still have a lot of resistance, I would.be tempted to remove the bearing housing and inspect the bearings for alignment, if necessary drifting them out and checking they will slide nicely over the stub axle, then refit.
I discovered that not all aftermarket bearings are exactly the same, eg moprod and Quinton hazell have slightly different seals. Worth bearing in mind !

 

[Mike Pass]

Hi John,
I assume you are correct that the hubs are Granada Mk2 and not Mk3. I am more familiar with the Mk3 rear hubs as fitted on my GTD. They are a little bit different but have many similarities.
Mk2 info....
The hub should not be excessively tight to turn. There should be no play and the only resistance to turning should be from the drag of the grease. It should turn easily by hand. The torque for the hub nut should be 180 - 200 ft.lbs. This is quite a lot of torque so when I do the final tightening on my Granada Mk3 hubs with the wheel on the ground to stop it turning and use a big 3/4" drive torque wrench.
I would strip the unit down and check that the parts are fitting together correctly. Try dry assembling the parts away from the carrier to check that they are fitting easily. If they are too tight use some very fine wet and dry to remove any high spots until they fit together smoothly with a reasonable amount of force. Use a digital caliper to check that the assembly goes together without undue crush on the bearings. As the bearings are the non adjustable type they should fit together without any play and with a set amount of bearing preload determined by the dimensions of the parts.
I have attached some info on the Granada Mk2 rear bearing assembly which may help.
Cheers
Mike

 

[Kev Farrington]

Hi, sorry to state the obvious but one side turns clockwise and the other side anticlockwise. I only mention it because a unit I had removed in a scrapyard was wrecked by their mechanic/employee.

 

[John Cohen]

Thank you all for your input . Very helpful .. I have removed the units and found that I didn't push the grease seals in far enough .... I'm a plonka ......

John.

 

[Jason Lycett]

Hi John

Just a sidenote

The tornado manual (at least my old one) tells you to just make the torque up tight and not up to 180-200ft/lb.

Might be worth checking this before you break a bearing

 

[Mike Pass]

The figure of 180-200 ft.lbs. is from the Haynes workshop manual for the Mk2 Granada.
Cheers
Mike

 

[John Cohen]

Hi John

Just a sidenote

The tornado manual (at least my old one) tells you to just make the torque up tight and not up to 180-200ft/lb.

Might be worth checking this before you break a bearing

Thank you will check it out .....