final drive and prop questions

jimmyebay

Petty Officer 3rd Class
Joined
Jul 26, 2009
Messages
83
i just bought a 1990 maxum with a 3.0l 130 hp. got a mercruiser alpha 1 with a 1:98r...serial number is 0c827796(believe this is a gen 1???) the upper part of the outdrive is bad. the "pinion and carrier" gears are stripped out. the lower unit feels smooth and engages to reverse and forward. are the upper units are geared the same? like for a 1:84 final drive upper unit the same as a 1:94??? would a 1:84 final drive work is this boat or would i be giving myselft problems???? got anything laying around? need one...:)
 

hwsiii

Commander
Joined
Jan 25, 2009
Messages
2,639
Re: final drive and prop questions

Jimmie, you will have an increase at 4,600 RPM Tach RPM from 2,323 Shaft RPM to 2,500 Shaft RPM, which is almost exactly 7%. This will only change a theoretical 15" pitch prop to about a 14.5" pitch prop and I do not see that as a problem.


H
 
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