hi there i have a 998 belived to be A+ gearbox and i am trying to remove the crownwheel from the diff but am abit unsure of how to romove the big thrush bearing on the shaft. any ideas on how to remove without damaging it.. also... how can i lock up the gears in the box to undo the big nut the holds the pinion in also does anyone know the size of the nut? my main bearing has broken up inside the casing and is not allowing me to select gears. thanks alot.!
Crownwheel And Pinion Removal?
Started by
Surfbluegarage
, Jul 03 2008 05:10 PM
3 replies to this topic
#1
Surfbluegarage
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Posted 03 July 2008 - 05:10 PM
#2
dklawson
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Moved Into The Garage
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Posted 03 July 2008 - 05:38 PM
I seem to recall that there are two types of differential bearings. The older type can easily be removed with a simple 3-leg gear puller. The later type bearing is marked "thrust" on one side. I think you'll need to improvise some plates to support the inner race and press that one off. However, since you're more likely to have a 3-leg puller than an arbor press, I'd try it first, applying the load gently.
To lock the gears so you can remove the pinion it is necessary to remove the linkages on the outside of the gearbox. This will allow you to move both shift forks forward or back at the same time. When you lock two different gears to the main shaft at the same time the gearbox "locks up" so you can remove the big nut securing the pinion. DO NOT use an impact wrench on the pinion gear nut. The most clever way I've seen the nut removed was to place cardboard on the ground and jack another car WAY up so you can lower its front wheel on the gearbox to hold it down on the cardboard. The weight of the car on the gearbox will hold it securely while you apply the torque to remove the big nut.
To lock the gears so you can remove the pinion it is necessary to remove the linkages on the outside of the gearbox. This will allow you to move both shift forks forward or back at the same time. When you lock two different gears to the main shaft at the same time the gearbox "locks up" so you can remove the big nut securing the pinion. DO NOT use an impact wrench on the pinion gear nut. The most clever way I've seen the nut removed was to place cardboard on the ground and jack another car WAY up so you can lower its front wheel on the gearbox to hold it down on the cardboard. The weight of the car on the gearbox will hold it securely while you apply the torque to remove the big nut.
#3
Surfbluegarage
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Posted 03 July 2008 - 05:42 PM
hi there thanks very much for that information thts a massive help.. just one small question.. when you said the thing about the two fork locking the main gear up.. could you maybe go into a little more detail plase as i am abit unsure of this still.. plus do you know the size of socket i wld require?
#4
nomininolife
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Posted 03 July 2008 - 05:46 PM
Just to add to this, a really good investment would be the Bill Sollis engine builder DVD made by MiniFilms.
It also covers the gearbox and gave me the confidence to recon my gearbox.
David
It also covers the gearbox and gave me the confidence to recon my gearbox.
David
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