1971 Mercury 110, 9.8 hp lower unit question

[RandyJ]

I've got a 1971, 9.8 h.p. mercury outboard. I just got it and was told it has issues with the lower unit. I need to know what other years/models, etc. will swap out with this one. I can get one that is from a 1971 7.5 hp but need to know if it will work on this motor before I have it shipped to me. As always, any help will be greatly appreciated!

 

[emckelvy]

Re: 1971 Mercury 110, 9.8 hp lower unit question

'71 7.5 and 9.8 lower units would be the same fitment, props might be pitched differently but other than that they're physically identical.

Just make sure the driveshaft lengths are the same, as the lower unit must be completely dismantled in order to change driveshafts (if for example yours was a short shaft and the 7.5 long, or vicey-versey).

The difference in shaft length between Long and Short would be 5".

HTH...........ed

 

[bigblues]

Re: 1971 Mercury 110, 9.8 hp lower unit question

'71 7.5 and 9.8 lower units would be the same fitment, props might be pitched differently but other than that they're physically identical.

Just make sure the driveshaft lengths are the same, as the lower unit must be completely dismantled in order to change driveshafts (if for example yours was a short shaft and the 7.5 long, or vicey-versey).

The difference in shaft length between Long and Short would be 5".

HTH...........ed

i just got a 9.8 an it dont go in to forward or reverse,an makes sounds like not going in gear, lik a car not goin in gear just lightly,was thinking they may have put in wrong shaft, thx for any help

 

[Texasmark]

Re: 1971 Mercury 110, 9.8 hp lower unit question

Who told you that they have problems and what do they know about it? I had a 7.5 of that vintage and never had a minutes trouble.

Mark