1976 7.5 Mercury Drive Shaft

[67Thompson]

I am looking for a replacement Drive Shaft for 1976 7.5 hp Mercury Motor. SN 4552100 . What are my options with other motors ? Different years ,Please any idea's would help. Motor runs great ,Drive Shaft is all rusty. It's to bad these weren't Stainless Steel .

 

[racerone]

Johnson and Evinrude started using stainless shafts in the early 50's if not before.--------Mercury started using them in the 76 / 77 years.----Your motor may have an older lower unit installed, I can not tell from here.----------E-Bay is a possibility for an affordable one.-------Your location makes a difference as well.-----Many motors available for reasonable dollars / for parts and at less than $100 depending on your location.---I sometimes machine a stainless sleeve with 0.010" wall thickness to repair those rusty shafts.---Look for a " speedy sleeve " repair option.

 

[tpenfield]

I just went through this on my 1969 Mercury 7.5. There were several drive shafts shared among the 7.5 and the 9.8 motor, and possibly the 3.9. . .

The stainless steel shafts came out in the late 1970's as stated. I would not go with the carbon steel shaft as they will get pitted, even if you find one in good shape.

I would go to marine engine . com and check the p/n for your drive shaft versus one from a slightly new engine maybe 1979 or 1980. Then check ebay for who's got one for sale.

I got one from a 1980 motor for $160

 

[emckelvy]

You might find the info in these 2 recent threads highly useful:

http://forums.iboats.com/forum/engi...oards/8153779-1969-mercury-7-5-hp-drive-shaft


http://forums.iboats.com/forum/engi...er-outboards/9943154-rusted-driveshaft-repair

 

[tpenfield]

Just a quick search on ebay showed some slim pickin's for those drive shafts. I think I searched periodically for about 6 months and found one well under $200.

 

[racerone]

Well, I bought a complete motor at an antique outboard meet for $80 with a working switch box and good lower unit with stainless shaft.-----If you want stuff immediately you have to pay.----If you have patience then you come across good deals.