Re: V4 and V6 Lower Unit Compatability...
I am thinking there are at least two different V4 small gear case LU's.. and then there is a large gear case V4.
now because the gear cases are different, I guess doesnt mean they wont bolt up...
also I recently looked up on the brp site and they listed a gear housing and bearing assembly that fir my motor as also fitting the FITCH motors in 4 cylinder
are the fitch motors 60 degree blocks??
but the BRP interchange is kinda funny....youd think if they list something as interchangable with another motor, they are saying it was part of that motor...that isnt true, because they list 90 hp and 115 hp carbs on the same year and model blocks..
same goes for 9.9 and 15 hp carbs
also the heads for 90 hp and 115 hp s on the 60 degree blocks have different part numbers, but are said to be used on all 90 and 115 hp motors in 60 degree from 95-99!!!! but!!we know they only came on their respective hps
so interchange and "came on" are two different meanings
I have a link at work that shows the different heights of the lower units...and some are VERY close to being the same length...small fractions of an inch different!!
actually I just found it:
http://www.sterndrive.info/outboardmotor/help_identifying_lower_units.html
pretty good info
even the dia of the hub is very close.
I would think that if the water tubes fits and the splines match...a lower unit that is 1/16th " different in length would still work!!
bob