Diff Rebuild

[Spiti1976]

Hi,
I am rebuilding my diff (FCxxxxxx; 3,89 ratio Vitesse Mk2).
According to the manual (either Vitesse or Spitfire) there is a special tool for setting up the pinnion height neccessary.
I haven’t got this special tool (surprise… ;) ).
Is there a measure from the bottom of the bearing bed or similar? Any values for me?
I could do it with try and error, but there is certainly a better way to do it….
I appreciate any advice.
cheers Alex

[Pete Lewis]

you can use a dial indicator and a  block to enable setting the height of the pinion with its new head bearing to replicate the exact same as whats taken out ,  
the mounting distance is in principle the need to align the projected cone of the  pinion with the centre line of the diff case bore.

if we had the drawings its easy to calculate the distance but my books dont show whats needed

the numbers on the end are to + -  to achive best running postion for the pair of gears ,

Pete

  

[Spiti1976]

Thanks Pete,

I will start with the actual height and from there it will be try and error with the mesh.

Well, what a nice project for winter.
I started with a fixture for spreading the diff.

[Pete Lewis]

Thats a nice try but it wont work you need to apply the spread to the bearing cap bolt holes not the bevel gear carrier as you have designed I dont think you will get that to open the bearing case width up.  many dont even bother but you do need preload on the bearings or they will move the running points when under power .  
   needs a Mk2 I fear ,  but try it you could be on a winner

[Spiti1976]

I tried the fixture and was able to remove the carrier with ease, and it had a preload.
It is only necessary to spread it a bit more then the preload (0.003").

I had my doubts also... but finally it worked. Maybe not on a daily base ;)

[Pete Lewis]

thats a pleasing result  ..good stuff

           Pete