I wondered about that after your first post. I thought the prop on the Merc
I/Os was the same as the big Merc outboards which is 1 1/16. Since I never
owned a Merc I/O I wasn't sure.

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"bowgus" wrote in message
...
Oops ... my apologies ... it's a 1-1/16" ... not a spark plug socket at
all.

"Elliott Stage" wrote in message
...
If it is the old style plugs it is a 13/16s socket size.

bowgus wrote:

Dunno but my spark plug socket (auto) fits exactly.

"David" wrote in message
news:caxhd.31973$G15.6994@fed1read03...
Hello,

For the 04 Mercruiser 3.0L Alpha I I/O engine, what size of prop
wrench I
should buy. Thanks.

David