I have an '81 Glastron with a Mecruiser 228. I need to replace the
impeller in the outdrive. What outdrive should be on this boat? Are
all mercruiser impellers the same? Is the disassembly/replacement
procedure the same on all? Does someone have the step-by-step to
replace this part? Maybe an exploded view schematic of this outdrive?

Thanks in advance for whatever you can provide,
Chris