swapping aq131a / 275 leg out for merc 4/3L

nogamesjoe

Cadet
Joined
Sep 4, 2014
Messages
10
I have a 1986 bayliner trophy and I plan on taking out aq131a and 275 and putting in 1986 merc 4.3L using merc. adapter plate 827691a1 I made a template but as you can see in pics it does not!!!! just bolt in and later found that these adapter plates are only for 270 outdrives.. can I just cut out and fill old holes be good to go ? will plate be in right place and work ?
 

Attachments

  • 20150501_163126.jpg
    20150501_163126.jpg
    14.6 KB · Views: 0
  • 20150501_163344.jpg
    20150501_163344.jpg
    15.6 KB · Views: 0

achris

More fish than mountain goat
Joined
May 19, 2004
Messages
27,468
My preference would be to take the hull to a good fibregalss guy and have him completely fill the existing hole and recut it for the Mercruiser... Use an 'X' height of 13-9/16".
 

nogamesjoe

Cadet
Joined
Sep 4, 2014
Messages
10
did ya see pics sorry being side ways but it looks like all is needed is to fill old holes and cut some out at top wouldn't ya think
 

achris

More fish than mountain goat
Joined
May 19, 2004
Messages
27,468
The pictures didn't make much sense. Is the current hole smaller than the hole required for the adapter plate?

As for it putting the Mercruiser gimbal housing in the right place, all I can suggest is you measure the distance from the bottom of the adapter to the centreline of the crankshaft and transfer that measurement to the hull and make sure it's 13.625" vertically up fro the bottom of the hull...
 
Last edited:

nogamesjoe

Cadet
Joined
Sep 4, 2014
Messages
10
yes it would need cut out as you can see in pics and I sure will use the x spot measuring your talking about so drive line is IN LINE thanks so much . joe
 

achris

More fish than mountain goat
Joined
May 19, 2004
Messages
27,468
yes it would need cut out as you can see in pics and I sure will use the x spot measuring your talking about so drive line is IN LINE thanks so much . joe

The important thing is that 13.625" measurement is NOT along the transom, but up from the line of the bottom of the hull at 90 degrees.

top.jpg
bottom.jpg
 

nogamesjoe

Cadet
Joined
Sep 4, 2014
Messages
10
Thanks so much achris the info you provided will get the job done THE RIGHT WAY Awesome!!!! and I found that only!! the alpha gen 2 will bolt up to the adapter plate
 

achris

More fish than mountain goat
Joined
May 19, 2004
Messages
27,468
... I found that only!! the alpha gen 2 will bolt up to the adapter plate

If an A1G2 will bolt up, then anything after about 82 will bolt up... The only difference between Alpha One and the Gen II in the hole requirements is the A1G2 requires 2 additional holes at the top.... All the other holes are the same.
 
Top