Another Yamaha corrosion casualty

[fitz73222]

Sounds like a fun project! Right up my alley. I just got through going completely through a 1953 Mark 20 Mercury and I'm going to light up that bad boy this weekend. Then I will completely disassemble her and do the full restoration!

[bondobill]

With the crappy weather this weekend I had a day to pull the kicker off the boat and start the dismantle .
This one didn't come apart as easy as the one that was in storage for 13 years.
Got the power head off finally...no matter what you are working on there always seems to be one bolt that is a sob.
This is a shot of the upper casing with the power head off, just a wee bit gunked up  

Oil tank...and I was wondering why there was always a oil slick following the boat while on troll.


Got through the day with out busting a bolt  :o
Took Fitzs advice.............
patience, heat, penetrating oil, and ...
I can't remember if this last one was his advice or some one else.......
A chit load of beer  

Bill

[fitz73222]

That's some amazing corrosion. It looks like something from the Bahamas related to the salinity of the water. Obviously, you guys have some pretty serious salt water in the northern latitudes. You may want consider chromate and paint for the oil tank from the other engine maybe some extra zincs on the cav plate or skeg. I strongly recommend using Mercury Perfect Seal compound on your screws and gasket surfaces; it stops that corrosion creep between surfaces. I've used it for 20 years and swear by it! 10 years from now, in saltwater, it will come apart if you use it...

[wingtime]

HOLY CORROSION!    That thing looks like it has been sitting on the bottom of the sea for 20 years!

Fitz where can one get this Mercury Perfect Seal you speak of?  I have heard it is not a good idea to use standard anti-seize compound on items used in salt water.

[fitz73222]

HOLY CORROSION!    That thing looks like it has been sitting on the bottom of the sea for 20 years!

Fitz where can one get this Mercury Perfect Seal you speak of?  I have heard it is not a good idea to use standard anti-seize compound on items used in salt water.

I get it from Ishop Marine; Mercury part number: 9234227Q02 pint can with brush $16.12 plus freight. A little goes a long way on gasket surfaces and screws. I taught Scotty how to use it on his engine(s) reassembly. And you're right, if you want it stuck together forever in saltwater, use Neversieze.

[bondobill]

That's some amazing corrosion. It looks like something from the Bahamas related to the salinity of the water. Obviously, you guys have some pretty serious salt water in the northern latitudes. You may want consider chromate and paint for the oil tank from the other engine maybe some extra zincs on the cav plate or skeg. I strongly recommend using Mercury Perfect Seal compound on your screws and gasket surfaces; it stops that corrosion creep between surfaces. I've used it for 20 years and swear by it! 10 years from now, in saltwater, it will come apart if you use it...

Thanks Fitz...I'll see if I can find that compound, we have a couple Merc dealers locally.
I was shocked at the amount of corrision, could it be from the stainless bracket I had the kicker mounted to.
I had a 5" bracket mounted on the transom for the kicker that was made out of stainless. The motor was mounted directly to the bracket with no barrier between the bracket and kicker.  
I since have got rid of the bracket. When I redid the transom I raised it 5" on the outside. Kicker is mounted directly to the transom now.
I always thought the salinity in our colder water.....especially with our amount of fresh water running in..... was less then warmer water environment.
Who knows,  All I know is this is the 3rd kicker motor that has rotted out on me.

Waiting on seals, gaskets and water pump that I ordered a week ago and paid for 2 day air..still haven't shipped. :(
I be hoping I can remember how to put it all back together when I get the parts.  

Bill

[wingtime]

I've always heard the salinity of the ocean is higher the closer you get to the poles.

I guess that statement is wrong look at what NASA is up to: http://www.nasa.gov/mission_pages/aquarius/news/data-first-year.html

[RickK]

Here is a chart of galvanic corrosion risk


With the stainless bracket you may have made the engine the sacrificial anode, like we'd normally use a zinc anode as the sacrificial metal.  In this chart the higher the metal is on the left side the more it will corrode when connected to something lower on the left side.  Zinc is the most common metal used but look where Stainless is on the chart compared to metals above it.  What is the engine made of? or at least all the parts that corroded like crazy?  

Here is one of a ton of topics on the web about this. http://www.roymech.co.uk/Useful_Tables/Corrosion/Cor_bi_met.html

[bondobill]

What could possibly go wrong!?!?

Well I got the motor back together last night.
Used the upr casing and the complete power head off the totaled motor
Lwr unit, tilt assembly and handle off the corroded engine.
Darn thing fired right up  
I was concerned about using the carb off the engine that sat all those years but she runs great...
Only problem is the water isn't getting to the power head :(
and the shift lever won't go in reverse, it will if you spin the prop first then try.
I installed a new impeller.
Ran the motor on a hose, water wasn't coming out the pee hole, I am pretty sure it wasn't getting to the powerhead cause it started to get hot.
 
A friend has the same engine and he says his shift lever won't go in reverse either when he is running it on a hose, but has no problem with it out in the water.
Maybe I don't have a problem there, just doesn't make sense to me, does that make any sense to you guys ?

Going drop the lower unit tonight and try to figure out what up with the water issue, any thing I need to look for ? Could it be a stuck thermostat ?
Will try one more time.
Can't be messing around too much longer with this kicker...salmon season opens in 2 weeks.

In the mean time going start calling around to get some prices on a new kicker.

Bill

[bondobill]

She pumps water
I had a brain fart when I put it back together the first time
Donor motor oil tank and water tube where for a long shaft, engine on boat is a xl shaft
Tank is the same but water tube is 5" too short
Hung the engine on the boat this morn and fired it up
Pumps water like a sob, also don't have a clue why, It now it shifts into forward and reverse  8)

Not that I don't trust my work but......
I just placed it 4 sale on Craigslist

Bill