sutor623
Rear Admiral
- Joined
- May 23, 2011
- Messages
- 4,087
Thanks to Faztbullet, I have found out the gear ratios of the lower units that I have been plagued with, as well as the part #'s to the tools that I need. I am trying to find out two things, one that has been quite hard for me to figure out. I have a 1967 4 cylinder 650 with a bad lower unit. I also have another lower unit that we have had a little bit of a time identifying. The gear ratios of the units are as follows. The spare lower unit that I have has a 2:1 ratio. So that means that if any of these lower units HOUSINGS would fit my 650, and in the 2:1 gear ratio then it is the unit that I have.
900/90/1150/115/1400/140/1500.........................2:1
40/45/50/500 4 cylinder......................................2:1
650/75/80/800/850 4 cylinder..............................2:3:1
Here is a link to the pics that I have posted of my "good" and bad lower units.
http://forums.iboats.com/showthread.php?t=524723
Here are the main questions:
1. If I do in fact have a 90-150 series bottom end (which is highly likely) is the spanner nut / cover nut tool going to be the same as for the 650? I have been told that the part number for the 650 is 91-53126 but this part is now unavailable through Mercury.Do you guys have any idea where I can get a Sierra or other aftermarket tool for it? The nuts are the same size but one has 8 tabs and the other has 4. To me it looks like a 4 tab tool would work for both cover nuts. The link underneath is to the part that I believe to be the correct spanner nut tool. Do you guys agree?
2. Once I get this lower unit apart, will the 650's gears be interchangeable with the bearing carrier and prop shaft of the 90-150 unit?
http://www.ebay.com/itm/MERCURY-LOWER-UNIT-TOOL-MARK-10-15-28-GEAR-CASE-COVER-/120823258401?pt=Boat_Parts_Accessories_Gear&vxp=mtr&hash=item1c21a09d21
I know these are some deep questions but I am giving you all the information that I can to get this issue solved. Thanks!!
900/90/1150/115/1400/140/1500.........................2:1
40/45/50/500 4 cylinder......................................2:1
650/75/80/800/850 4 cylinder..............................2:3:1
Here is a link to the pics that I have posted of my "good" and bad lower units.
http://forums.iboats.com/showthread.php?t=524723
Here are the main questions:
1. If I do in fact have a 90-150 series bottom end (which is highly likely) is the spanner nut / cover nut tool going to be the same as for the 650? I have been told that the part number for the 650 is 91-53126 but this part is now unavailable through Mercury.Do you guys have any idea where I can get a Sierra or other aftermarket tool for it? The nuts are the same size but one has 8 tabs and the other has 4. To me it looks like a 4 tab tool would work for both cover nuts. The link underneath is to the part that I believe to be the correct spanner nut tool. Do you guys agree?
2. Once I get this lower unit apart, will the 650's gears be interchangeable with the bearing carrier and prop shaft of the 90-150 unit?
http://www.ebay.com/itm/MERCURY-LOWER-UNIT-TOOL-MARK-10-15-28-GEAR-CASE-COVER-/120823258401?pt=Boat_Parts_Accessories_Gear&vxp=mtr&hash=item1c21a09d21
I know these are some deep questions but I am giving you all the information that I can to get this issue solved. Thanks!!