Help identify Mercruiser drive #

[tmh]

Hi. I have a re-power project going on and have asked many ??? so far. Here's the latest. I am pulling my 1985 merc 305 5.0L engine (has Alpha one drive). I am trying to find another boat to put it in. I see some for sale without engine or outdrive so i may or may not need a drive as well.

I see listed a mercruiser outdrive the seller says is an Alpha off a 4-cyl engine. he lists the serial # as

"Serial # A 420915 with an F on the side".

Where can I find a cross reference sheet to find out just what drive this is? If Alpha One like mine, would I need one from a smlilar V8 powered boat (gear ratios different, i think).

Thanks.

 

[Haut Medoc]

Re: Help identify Mercruiser drive #

Can't help you with the # but, the gear ratio in the upper is roughly 2.0 :1 for a four cyl. & 1.50 for an eight cyl.......
The lower should work on either gear ratio provided the are of the same vintage......
Don S has a way to look up the specifics, I'd look fo his reply......

 

[Bondo]

Re: Help identify Mercruiser drive #

If Alpha One like mine, would I need one from a smlilar V8 powered boat (gear ratios different, i think).

Ayuh,...... You've got It,..... That's pretty much the way it Works,......

Gear Ratios,+ Vintage are the Keys.........

 

[Don S]

Re: Help identify Mercruiser drive #

Don S has a way to look up the specifics, I'd look fo his reply......

Sorry, but I don't have that ability anymore.