Gear Box Bearing

[lazyduck15]

Hi, Need some help on a gear box.
I have installed an engine 1289cc and its gearbox from a R5, just recently. While swaping the gearbox handle I noticed lot of play on the upper shaft of the gear box along with, I guess, the 4Th (The one opposite to the engine) gear damaged by fast wearing due to the play. The bearing seems to be uncomplete, no balls et all (Was it balls type?).
The question would be if It is possible to replace the bearing just by opening the box from the side of the speedometer, extracting what is left from the bearing and replace for a new one. Do anybody knows the ID number for this bearing?.
On the other side, I am afraid I will have to replace the mentioned gear, as it is very damaged. Is it the same (Teeth qty, Diameter etc ) that is installed on the R4 gear box? Are they switcheable?

I will appreciate your comments

 

[angel]

This is a taper roller bearing and you cannot replace it with the gearbox on the car, because you will need to remove the primary shaft first which is done through the clutch side of the gearbox.
If the secondary shaft gear is so badly worn, chances are that its matched primary shaft gear will be worn too,and this means replacing the whole primary shaft...if still available. There may well be wear on other components, too, and certainly a lot of metal particles around.
If it is a 4 speed gearbox,the bearing should be the same as on a R4, part no. 0857591600 (standard bearing 17 x 40 x 13,25, SKF 30203 J2).
I don't know if 4th gear ratios are the same on the R4, the gear on the secondary shaft has 30 teeth, if it is the same on yours, then the parts are identical.

 

[lazyduck15]

I just have removed the gearbox from the car, Certainly the bearing is a 30203.

I have found that upper shaft fourth gear is damaged along with the lower shaft reverse gear. Both upper shaft bearings are destroyed, and on the bottom of the gearbox there were three pieces of metal, once teeth’s of the reverse gear as well as some parts of the bearings. The oil was plenty of metal particles ("There may well be wear on other components, too, and certainly a lot of metal particles around"."). I cannot think how the previous owner could that damage.
I guess my only chance is to recover the lower shaft. I suppose some of its gears are removable, if so, I will replace the reverse gear (Is it replaceable?) with the one coming from the original R4 gearbox along with the upper shaft of it.
I need some directions as to how to remove the shafts. Which one comes first and what to remove to free it. I tried the upper shaft now that both bearings are out of the way, but it does interfere with the lower one in the way out at the second speed driven gear. I think that I should remove the sliding gear for reverse. Am I right?.
To remove the lower shaft I guess I should remove the plastic gear that drives the sppedometer, should I, is it a kind of a lock for the lower shaft?

Any comments welcome!

 

[angel]

Send us a photo from the gearbox if you can! It will be interesting... I can only guess that somehow the previous owner selected two gears simultaneously...but the selectors should be very worn to do this. I cannot think anything else.
You should first remove the differential (note the exact position and number of turns of the bearing ring nuts so as not to lose the adjustment). The speedometer drive gear holds the secondary shaft together (I don't remember it to be plastic though). You will need a thin spanner to loosen it (I have done it CAREFULLY with a punch and hammer). After you remove the secondary shaft, the primary shaft is free to come out. The reverse idler gear can remain in the casing (or can be removed last).

 

[SWIFT]

beware - just because the gear has the same number of teeth doesn't mean the cut is the same ( you may find the angle of the gear cut varies ) - you must fit a matched pair

 

[angel]

Renault does not match the secondary shaft gears with the primary shaft ones. They give separate part numbers for each secondary shaft gear. Since the primary shaft gears are machined on the shaft (and are not removable), if one secondary shaft gear went wrong, one would have to rpelace all those gears!!
It is relatively simple to control helical gear cut, and tooth angles are standardised for a lot of reasons. Hypoid gearing is another issue, these are always matched as a pair as they are being "run in" after being cut.

 

[SWIFT]

I apreciate that the primary shaft gear is part of the shaft , however, Renault do use varied gear cuts hence using a gear out of a different box may not mesh to the main shaft gear - I've had this problem before and its not funny when you refit it all and the damn thing has to come back out again