50 hp and 48 hp lower unit

[Chick]

Does the 1995 50 hp and the 1995 48 SPL use the same lower unit? If not, do the splines and shift linkage hook up?

 

[racerone]

It is all the same.---Read post #2 on a similar thread about these flimsy lower units,.

 

[Chick]

I know the 48 lower unit's are weak

 

[racerone]

???----The 48 and 50 are exactly the same !!!

 

[Chick]

What is the date range that had the weak lower units?

 

[racerone]

All of them !

 

[Chick]

I know there were earlier 50 hp that had a better lower unit.

 

[racerone]

In my opinion the 40 / 48 / 50 / 55 / 60 HP 2 cylinder units from about 1978 to 2005 were all weak !----Hence this fact.----For the commercial models they used the much stronger 3 cylinder lower unit on these motors. -

 

[Chick]

I guess I've never seen a commercial model. I have only heard complaints on the models beginning in 92 or 93. I don't recall when they quit using this unit.

 

[racerone]

The 89 to 2005 are all the exactly the same !!-----The only difference is a smaller spline on top of the driveshaft on the 89 to 92 models.-----Seems you doubt the information presented here??

 

[Chick]

Not at all. The earlier models were bulkier. I knew the later models had a different spline. Thanks

 

[Chick]

I wish I could find how-to adapt a heavier lower unit, but that's not happening. The 48 & 50 were good motors. Just a shame they had weak lower units.

 

[racerone]

The early 1971 to 1975 had bigger lower units.----But those do not fit an 89 or newer model.

 

[Chick]

Unfortunately, I know. Manufacturers, whether outboard, cars, tractors, whatever, cannot stand it when something works.

 

[Chick]

The early 1971 to 1975 had bigger lower units.----But those do not fit an 89 or newer model.

It seems like, knowing the things crater, would make the parts out of stronger materials. I say that, but they might already be doing that.

 

[racerone]

I doubt it.-----Got some " warranty / insurance " gearcases off a dealer.---Only $25 each and hardly a scratch on the paint.-----Twisted splines and crunched up gears are the norm these days.

 

[Chick]

When you rebuild these lowers, do you have to set the lash in the gears by swimming, or do they just go together?

 

[Chick]

Shimming darn spell check

 

[racerone]

Yes , the pinion gear MUST shimmed for proper tooth contact / backlash.----Best have a shop with correct fixture ( i have it ) do this for you.

 

[Chick]

Yes , the pinion gear MUST shimmed for proper tooth contact / backlash.----Best have a shop with correct fixture ( i have it ) do this for you.

Thanks. When one gives, I'll get with you. I don't have a spare lower to rebuild right now.