Reply To: Old Mercury Identification

[billw]

The cartridge opening faces down, so you don’t technically need to remove it, to change the impeller. However, if any of the blades on the old impeller are broken and missing, odds are they are jammed into the cartridge outlet. It’s tough to get the broken pieces out without removing the cartridge. At least I, personally, have found it hard to impossible. If you take the power head off a Merc series automatic (which is dirt-simple) you can drive the cartridge down with a socket and extension, with no damage to parts.

Long live American manufacturing!