Transmission sleeve lubricating holes question

As per photo, the bearing sleeve on left had been drilled 4X by factory. The one on the right, is from a latter transmission, same location, same purpose. Would it be advisable to drill replacement sleeve? If yes, how is this performed in order not to leave burrs?
A touch up with a fine abrasive stone?
This, for an "L" series transmission rebuild.

The previous "Dino butcher" had left out a 4mm spacer, that resulted in a few gears that pounded their respective ends shut, preventing the removal of the caged bearings. Fortunately that issue has been solved with a lot of patience and time.

Even though it looks very straightforward, if you have any tricks or caveats beyond the factory manual, I am all ears...

Thank you. Regards, Alberto
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Clay, absolutely right. ROCK HARD. Nothing will go in , not even my best Chinese drill bits...;-)

Bottom line, as an "L" tranny is different from the next two versions, and it has lube holes on the shaft, it stands to reason (mine), that it will shoot oil through the sleeves and lube the needle bearing cages. If I were in the USA, it would not be an issue, as there are plenty of places that can drill holes through even harder surfaces, but here we are sort of limited.
I just realized, looking at the diagrams of an L. versus an M., the L. has an oil pump that pressurizes the transmission, thus I am mostly certain that the holes will have to be drilled into the new sleeves (used) that I cannibalized from that later transmission, without pressure lubrication. So now the question really boils down to be, how to drill the sleeves.

Please let me know what you think.

Regards, Alberto

 

Another peculiarity about these transmissions, is that on the primary shaft they are drilled at 12 o'clock and four o' clock, specifically, every 22.5 deg. on the female splines, whereas on the secondary shaft, they are drilled at 12 o'clock and six o'clock. All five L. sleeves have four holes drilled in the four cardinal points, on the male splines, yet on the primary shaft only one hole is usable for oil feed.
If very careless, and install the sleeve on the secondary shaft without looking, you have a 50-50 chance of coinciding the holes, whereas on the primary shaft, you always get it right 100% of the time.
I am unsure what the purpose or the rationale behind this.

Now, I am faced with the situation of whether I should have the holes drilled in the sleeves, as per the shafts, or the same useless fashion that it was done at the factory, as in one case only one hole lubricates and in the other, two.

There are only two scenarios, but neither makes sense to me.

On the one shaft they are trying to keep pressure higher, thus having only one functional hole and on the other, two functional holes as not so high pressure???

The other, is that the guys that were putting the sleeves on the primary shaft were not very adept, and it was a foolproof system as they could not make mistakes.

The guys for the secondary shaft however, were more mechanically inclined as on the 50-50 train of thought, thus more the thinking types.

Or whatever...

Regards, Alberto

 

Clay, I think your points are valid, yet, why do you think Ferrari:

1. Provided a transmission oil pump
2. Drilled holes in the shafts that feed through the sleeves and to the needle bearings.
3. Drilled the sleeves
4. Deleted the oil pump in subsequent models

You would guarantee a transmission rebuild without the holes?

I am drilling the holes, but not 4 in each sleeve as 3 are redundant, but I am drilling nonetheless.

I don't want warranty problems with myself as a customer...;-)
Regards, Alberto

 

The other guy was just giving advice...;-)

Brian, how many holes would you then drill?
Two holes as per that specific position on the shaft , even though only one is truly functional, or just one hole?
Thank you,
Regards, Alberto

 

Tim, I will post photos as it will be clearer.
Amazingly, it seems there is an outfit here that has some resources and say they can do it. They have an old one to experiment with. We'll see...
Regards, Alberto

 

How much does it cost, if something is lost?

 

The original sleeve has four holes, the shaft, two. You would really drill holes that don't serve any purpose?

Regards, Alberto

 

Oil pump in tranny cover, drilled shaft from L with solid shaft from M.
Regards, Alberto
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Both shafts, drilled for sleeves. Sleeves with four holes.
Do the math, only one hole is in line.
Regards, Alberto
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