Do rebuild the toilet...but don't even THINK of adding a motor
There are two different kits for the PH II, depending upon when it was made. Only about half the parts in each are interchangeable, so be sure to get the right one. Toilets made before 6-92 need kit PHRKII...Those made after 6-92--which includes yours--need kit PHRKIIC.
Now about adding an electric motor...
The Raritan PH II is an outstanding MANUAL toilet, but adding a motor turns it into a horrible excuse for an electric toilet. The motor only replaces the pump handle..the pump is still a manual pump. The motor pumps the toilet much faster, and with a much shorter stroke than pumping manually, which causes it to take longer to prime and therefore wears out the rubber o-rings etc much faster...and also causes the toilet to "choke" on flushes that deliberate pumping manually can push through...and it has a high amperage draw compared to most electric toilets. I know a lot of people who've added the motor who wish they hadn't...who've opted to disconnect it again permanently and put the pump handle back on. The PHE II (electric version of the PH II) also costs more than a real electric toilet.
For some reason sailors want to have it both ways--the "push button convenience" of an electric toilet, but also one that can be converted to manual in the event of a catastrophic power failure. But there's no advantage to that...'cuz if you don't have enough power to flush an electric toilet, you don't have enough to power nav equipment, lights, communication equipment or anything else either...but you DO still have a bucket! So whether you can flush a toilet or have to resort to using the bucket is the LEAST of your worries!
So if you want a manual toilet, the PH II is an excellent choice...but if you want an electric toilet, go with one that's designed to BE an electric toilet from the ground up, not a "hybrid."
