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Author Topic:   Corrosion inside 170 Montauk prop hub
Camuyano posted 07-06-2004 04:43 PM ET (US)   Profile for Camuyano   Send Email to Camuyano  

I have noticed some corrosion inside the hub of my prop. There is some on the center piece but also on the prop itself. I always wash the boat and motor with plenty of fresh water after every use and flush it for at least five minutes. I also trim the motor down for at least a few hours after use so the water will drain out. Is this normal? Should I take it to the dealer? Is there any anti-corrosives or lubricants I should be spraying in there?


Jimm posted 07-09-2004 06:46 PM ET (US)     Profile for Jimm    
The only thing I can say is that I follow your rinse ritual and do not have any problems---yet.
David Pendleton posted 07-09-2004 07:04 PM ET (US)     Profile for David Pendleton  Send Email to David Pendleton     
Corrosion like rust, or galvanic corrosion?
Jarhead posted 07-09-2004 08:30 PM ET (US)     Profile for Jarhead  Send Email to Jarhead     
Could a lack of spline/hub grease cause a problem that this?
Maximus posted 07-09-2004 11:06 PM ET (US)     Profile for Maximus  Send Email to Maximus     
Speaking of corrosion on the Montauk 170...

I use my boat exclusively in salt water, it is washed down and flushed after each use and stored indoors.

My factory installed swim platform bolts have rust circles around them.

Every moving part of the trailer has rust.

My Mills Bimini has corrosion all over the place. Some rivits are rusted, some not.

I haven't checked the hub, but will Saturday.

Knot at Work posted 07-10-2004 07:46 AM ET (US)     Profile for Knot at Work  Send Email to Knot at Work     
I boat exclusively in Saltwater as well, but my corrosion is almost non existent. 80 hours on the boat after almost a year.

I use Zip Wax when I wash her everytime and store her outdoors under a UV protected boatcover.

I recommend you check your water supply where you wash your boat. Iron deposits and/or well water?

just a thought

AQUANUT posted 07-10-2004 08:23 AM ET (US)     Profile for AQUANUT  Send Email to AQUANUT     
AREN"T you in Puerto Rico?

if my memory is correct, that is a really salty part of the carribean..corrosion or electrolysis tough one. the inside of your mercury prop should be a black composite material and brass including the thrust washer and nylox nut. Are you getting paint loss where the exhaust ventilates? thru the concern would be more if you were getting pitting in the prop blades {an idicator of electrolysis}
but where there is heat[exhaust] loss of paint in a very salty environment, doesn't suprise me...ya ought to see the outboards in the Red Sea.. really salty dogs!

Maximus posted 07-10-2004 10:01 AM ET (US)     Profile for Maximus  Send Email to Maximus     
~55 hours on the boat since last July...

The water is supply is supplied by the town, most likely well water.

Knot at Work posted 07-11-2004 08:09 AM ET (US)     Profile for Knot at Work  Send Email to Knot at Work     


you could have high level of sodium in the water and Iron.

I agree with Aqua... that part of the Carib is salty.

I would use Corrosion block on every inch of the boat, after every other use.

Camuyano posted 07-11-2004 09:52 PM ET (US)     Profile for Camuyano  Send Email to Camuyano     

I'm not in the Caribbean. (I wish I where!) That's where I grew up and hope to get back to it some day but for now home is Virginia. I do most of my boating in the lower Potomac, which is brakish and can be pretty salty. I don't know if there's any paint loss but I'll take a look tomorrow. Maybe I'll even take a picture to see what ya'll think.


Camuyano posted 07-12-2004 11:54 AM ET (US)     Profile for Camuyano  Send Email to Camuyano     

Here are the pics of the prop hub:

It is starting too look pretty bad. I can't figure out what it could be. Like I said I always rinse everything off with freshwater; however, we are on well water that is hard and high in sulfur. I wonder if that has anything to do with it. Any help will be highly appreciated.


Florida15 posted 07-12-2004 02:40 PM ET (US)     Profile for Florida15  Send Email to Florida15     
If your water is high in sulphur, you probably have rust stains on your tub, sinks and toilets too. Could be the culprit.
AQUANUT posted 07-12-2004 11:22 PM ET (US)     Profile for AQUANUT  Send Email to AQUANUT     
hmmmmmmm....had a 4inch sulphur flow well in vero beach florida...never made my sterndrives look like that...

I am inclined to think its Iron...heavy iron with heat can speed up oxidation.

the bad news isusually it takes an acid based cleaner so inhibit it further..that a pain

the good news is.... I saved money on my car insurance by switching to Geico....

Aquanut OVER and OUT !

davej14 posted 07-13-2004 03:45 PM ET (US)     Profile for davej14  Send Email to davej14     
Any possibility that you are running additives in your gas that could create the problem from exhaust?
Camuyano posted 07-14-2004 11:04 AM ET (US)     Profile for Camuyano  Send Email to Camuyano     

That's a good question. I'm not puting anything in myself but I wonder if it's the brand of gas I'm using or something in the gas in my area. I usually use Wawa gas since they are the cheapest and the station is on the way to the marina. Whenever we go to the lake for the weekend I usually fill up all tanks at Wawa before leaving since fuel near the lake tends to be much more expensive.


LabRtvr posted 07-14-2004 05:29 PM ET (US)     Profile for LabRtvr    
I use my Montauk 170 exclusively at the mouth of the Chesapeake Bay and have never used anything but WAWA gas. I have no corrosion anywhere on the boat after 18 months and 150 hours . Must be the well water.

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