68 MERC 650 Need a little help.

propwash

Seaman Apprentice
Joined
May 10, 2003
Messages
36
Hi guys,
I have had this motor for 10 years now and i absolutely love it,but a few years back i was taking in a little water in the lower unit then it progressivly got worse to where i didnt like it,so start really checking out this thing,well i find that i can grab the prop hub and move it up and down 1/16 to1/8th of an inch,is this normal?
then i take prop off and such and find that the washer between the thrust hub and carrier seals is not in there and there are none available anywhereanyone know the dimensions on these so i can make one maybe.
brass or steel .
also bought a 1970 propshaft to replace mine as i suspected it was bent and when i get i see it isnt even close to mine,the 70 is a tapered shoulder and mine is squared,could i still retrofit this one somehow,as the 69 and up models dont have that washer in the parts diagrams and a different thrust hub everything else looks the same.
just a note this motor was worked on at a marine mechanic school just before i got it, i think they never put that washer back in, as a result the prop side seal in the carrier popped out and wedged on the thrust hub and i could almost remove the cover nut with my fingers.
sorry so long but i want to do this thing right and have her last another 40 years.
 

propwash

Seaman Apprentice
Joined
May 10, 2003
Messages
36
Re: 68 MERC 650 Need a little help.

I guess to make this short does anyone know where to locate one of these washers or know what i need to retrofit the 1970 propshaft?
i'd rather get the washer to keep things original or the measurements.
thanks.
 

propwash

Seaman Apprentice
Joined
May 10, 2003
Messages
36
Re: 68 MERC 650 Need a little help.

the washer i'm looking for is number 83 on most schematics of this engine,someone must have an idea where to get one or if they have a motor apart have the dimensions on this thing.

thanks.
 

RaScLeS

Petty Officer 1st Class
Joined
Jun 27, 2009
Messages
230
Re: 68 MERC 650 Need a little help.

ive never had anyluck with replies on the site either. try and find a parts motor or go to a machine shop and get something made.
 

propwash

Seaman Apprentice
Joined
May 10, 2003
Messages
36
Re: 68 MERC 650 Need a little help.

Can't have one made without dimensions,bummer.
 

corm

Lieutenant Junior Grade
Joined
May 12, 2000
Messages
1,241
Re: 68 MERC 650 Need a little help.

Here is what you need

https://www.georgiawatersports.com/productcart/pc/viewPrd.asp?idproduct=20869&idcategory=2858

or this one
https://www.georgiawatersports.com/productcart/pc/viewPrd.asp?idproduct=20867&idcategory=2858
or this one
https://www.georgiawatersports.com/productcart/pc/viewPrd.asp?idproduct=20874&idcategory=2858

I don't have any at home to get the part number off of to see which one is for the inline gearcase.
They make them for the I.O.'s too. Bigger prop and case, ect.
This thrust hub converts the old style props to the tapered prop shaft.
Get the merc numbers and check to see which is for your engine.
A quick call to a Merc dealer will get you the answer.
 
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