Lower unit reassembly

harp2822

Petty Officer 2nd Class
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Jul 31, 2023
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The other week someone posted a lower unit diagram for a 64 9.5. Can't find it
 

harp2822

Petty Officer 2nd Class
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Jul 31, 2023
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So I got it put back together the way it should and the shift linkage leaks, friend of mine pressed it and lathed it so i can press it back in. Crappy design in my opinion
 

racerone

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Dec 28, 2013
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So you have a 60 year old motor.-----Ready to go for another 60 years.----But you say it is a crappy design ????
 

jitterbug127

Chief Petty Officer
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Feb 6, 2023
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637
Stick with it. You'll get better at the each time you work on them. last 2 lower units i've dropped. I've had the impeller replaced and back on in under 15 minutes. 3 or 4 months ago i would've laughed at that.
 

Crosbyman

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Nov 5, 2006
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So I got it put back together the way it should and the shift linkage leaks, friend of mine pressed it and lathed it so i can press it back in. Crappy design in my opinion
no so crappy if taken care of ....my 1966 served me well till i went to small kicker for trolling.
 

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racerone

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I try to point out that some of thee older motor really well built , easy to to troubleshoot and repair.----Some folks simply do not understand.----What is your opinion on the design of Mercury lower unit , with special tools required ?
 

harp2822

Petty Officer 2nd Class
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I had a machinest friend of mine squish the bronze insert so it wouldn't be loose where it's captured around the shift shaft. What is the other solution for this?
 

Crosbyman

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just opinion...

if the brass collar is loose sqishing it seems a bad solution.

shouldn't be to hard to find a thicker brass rod...... drilled out to the proper size for the shift rod and turned to reduce its diameter a few thousands extra for a better hold in the GC
your machinist friend should be able to do that for you ....being a machinist

maybe welding just a touch of regular solder to beef it up will allow a better fit
 

racerone

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Dec 28, 2013
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The o-ring inside can be replaced in 3 ways without damage to housing.----Pull bushing out after running a 5/16-NC tap in for 3 threads.-----Using the factory tool to drive it out ( I have 4 of them )----Or believe it or not you can remove / replace o-ring without removing the bushing.----And remember this was 1950's design and factory methods of the time.----A lot easier to maintain than some newer set-ups
 

harp2822

Petty Officer 2nd Class
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When I took it to an Evinrude Tech that worked at the factory and showed him how loose the Bushing was he said that it's common that the aluminum through time will corrode and make the whole bigger. He's been working on them for around 55 years. He suggested squishing it as a solution.
 

racerone

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Dec 28, 2013
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??---He would know about newer bushings that have a o-ring groove to help keep it in place.
 
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