There is little or no mention of electrolytic capacitors in PowerBook floppy drives in the various Macintosh capacitor references. Let's aggregate some info for the maintainers of these databases. If you have other PowerBook drives and can take them apart, please consider sharing their model numbers and the capacitors found inside.
The 140-180 series PowerBooks, apparently excluding the 150, use Sony MPF22A-01 floppy drives. I have one drive with a big "REV. B" sticker and another with a large barcode and ID that looks like an Apple serial number, and two without any extra stickers, but they all have the same blue Sony part number label. All four drives have one 47uF capacitor mounted to the underside of the PCB. (@3lectr1cPPC I told you that the drive had no electrolytics, apologies for the mistake). The markings on the capacitor match Panasonic capacitor markings, according to at least one StackExchange user, and if this is the case then these caps are rated for 6V. 6V seems natural anyway for a system running on 5V logic.
On my drives, the capacitors have not leaked. There are small bubbles of hardened fluid around the base of the capacitor, but it's glue, not juice. I desoldered one and measured it to be 51uF, and the drives still work with the old capacitors in place. I also replaced one with a Rubycon 16NXA47MEFC5X11 47uF 16V electrolytic and the drive still worked perfectly, once I realized that some of my 1.44MB disks were not cooperating in any drive with Disk Copy (which seems, perhaps obviously, to be more sensitive to bad disks than the filesystem). I think that these capacitors should be left in place unless you have a reason to replace them.
The replacement capacitor I used is 5mm diameter by 11mm tall. The capacitor actually sits against a swooping curve in the body of the eject motor assembly, marked below. Any wider than 5mm diameter and the PCB will be skewed, and any taller than 11mm and the PCB won't sit flush against the drive body.
The 140-180 series PowerBooks, apparently excluding the 150, use Sony MPF22A-01 floppy drives. I have one drive with a big "REV. B" sticker and another with a large barcode and ID that looks like an Apple serial number, and two without any extra stickers, but they all have the same blue Sony part number label. All four drives have one 47uF capacitor mounted to the underside of the PCB. (@3lectr1cPPC I told you that the drive had no electrolytics, apologies for the mistake). The markings on the capacitor match Panasonic capacitor markings, according to at least one StackExchange user, and if this is the case then these caps are rated for 6V. 6V seems natural anyway for a system running on 5V logic.
On my drives, the capacitors have not leaked. There are small bubbles of hardened fluid around the base of the capacitor, but it's glue, not juice. I desoldered one and measured it to be 51uF, and the drives still work with the old capacitors in place. I also replaced one with a Rubycon 16NXA47MEFC5X11 47uF 16V electrolytic and the drive still worked perfectly, once I realized that some of my 1.44MB disks were not cooperating in any drive with Disk Copy (which seems, perhaps obviously, to be more sensitive to bad disks than the filesystem). I think that these capacitors should be left in place unless you have a reason to replace them.
The replacement capacitor I used is 5mm diameter by 11mm tall. The capacitor actually sits against a swooping curve in the body of the eject motor assembly, marked below. Any wider than 5mm diameter and the PCB will be skewed, and any taller than 11mm and the PCB won't sit flush against the drive body.
