Hi,
I understand engine oil overfilling is bad and may render an engine a leaker due to excessive pressure placed on seals. However manual gearboxes are not pressurized and "sealed" like an engine. My manual gearbox has a breather to releave internal pressure if any. So why would it not be recommended to overfill the gearbox?? My gearbox type (french manufacturer) is known to be weak, especially around bearings. For example a higher oil level in the gearbox would mean a better lubrication of the secondary shaft bearings that are placed higher in the box.
So wouldn't this be a good thing to increase longevity of the bearings? Would it pose any trouble with synchros/friction? Most boxes work with an "oil dip" but why an oil batch wouldn't be better in some case?
Thanks
I understand engine oil overfilling is bad and may render an engine a leaker due to excessive pressure placed on seals. However manual gearboxes are not pressurized and "sealed" like an engine. My manual gearbox has a breather to releave internal pressure if any. So why would it not be recommended to overfill the gearbox?? My gearbox type (french manufacturer) is known to be weak, especially around bearings. For example a higher oil level in the gearbox would mean a better lubrication of the secondary shaft bearings that are placed higher in the box.
So wouldn't this be a good thing to increase longevity of the bearings? Would it pose any trouble with synchros/friction? Most boxes work with an "oil dip" but why an oil batch wouldn't be better in some case?
Thanks