After pulling my 787 and going over it, I was studying the balance shaft and oiling, since we've all been talking about the lubrication.
I noticed on the end of the balance shaft, furthest bearing from the cog gears, is a sealed bearing. Therefore, it is not lubricated or maintained by the enignes lubrication system.
Also, if you look in the pix I attached, you'll see that the casing area between those two rubber seals and the sealed bearing, have no oil residue. So, this tells me that the machined fit of the casings and the rubber seals, do not allow any oil to escaped the cogged gear area, where we maintain one ounce of oil, into that area that has been previously said to allow the enignes oil to come in contact with the CB shaft.
I've also been looking closely at the seal at the crank bearing. The bearing that is on the piston side, is closed off from the cog gear area and the one outboard is open to the oil of the gears. The beariing on the inboard side does have a shield that keeps the oil from easily escaping this area. I still don't believe it is hermetically sealed.
I have the bottom end of the 787 open right now so if anyone needs a look at something that has not been discussed, now's the time to ask me for a pix.....:cheers:
I noticed on the end of the balance shaft, furthest bearing from the cog gears, is a sealed bearing. Therefore, it is not lubricated or maintained by the enignes lubrication system.
Also, if you look in the pix I attached, you'll see that the casing area between those two rubber seals and the sealed bearing, have no oil residue. So, this tells me that the machined fit of the casings and the rubber seals, do not allow any oil to escaped the cogged gear area, where we maintain one ounce of oil, into that area that has been previously said to allow the enignes oil to come in contact with the CB shaft.
I've also been looking closely at the seal at the crank bearing. The bearing that is on the piston side, is closed off from the cog gear area and the one outboard is open to the oil of the gears. The beariing on the inboard side does have a shield that keeps the oil from easily escaping this area. I still don't believe it is hermetically sealed.
I have the bottom end of the 787 open right now so if anyone needs a look at something that has not been discussed, now's the time to ask me for a pix.....:cheers:
In lamens terms please. Lol :rofl: The litle that I know of hermetic is in religion and philosophy I hear plato may have shared some of the Hermeticall Philosophical views. There must be some other use of it than I know. :cheers:
