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Old 22 May 2020, 02:46   #1
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How much corrosion is normal?

Looking at buying a boat with a 2005 Verado 250 with 500 hours.

The engine looks in reasonable condition overall, but there is what looks to me like a lot of corrosion on the lower unit. Is this normal and how worried should I be?

Photos below, click to make bigger

Thanks

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Old 22 May 2020, 03:03   #2
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I would not buy it. That much corrosion which has obviously been painted over is way too much, the point of having anodes on the engine is to prevent corrosion, looks to me like the boat has been in the water for alot of time and perhaps the owner didnt keep up with regularly changing the anodes.

You would expect some paint to rub off from the lower leg which is normal over a long time and would just need a respray but for the actual metal of the lower leg to be like that, well ive never seen any like that.

Just look round a marina, look on the dry stack and compare and look at boats on moorings and compare. 500 hours on an engine from 2005 seems very low use to me, thats 33 hours a year use average which is 2.75 hours a month on average. Should not look like that unless the anodes have not been changed and its sat in salt water for a long time.

Walk away.
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Old 22 May 2020, 03:25   #3
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Agree with the above - looks like corrosion has been peeled off, flakes removed then painted without filling in the corrosion - probably tidied up (poorly and quickly) for sale. Reality is that this shouldnít happen with looking after the anodes but probably wasnít inspected for a while. Proper job would have tried to fill the corrosion, sand level and repaint properly. I would think there are better engines out there - probably left on a boat with the lower leg left in the water. Saying that if the mechanics have been looked after and serviced with evidence it might be the excuse for a really cheap deal - but suppose would depend if you are happy with the level of corrosion damage and whether that neglect is symptomatic of neglect in the maintenance of the rest of the engine ....
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Old 22 May 2020, 03:28   #4
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Only comment on the hours from Boris is that I donít think 500 hours is too low in itself for a seasonally used engine- we had a Suzuki 140 with less hours and 2004 year which was looked after (servicing, anodes etc) but used only each summer for odd weekends and a casual boating week here or there. Agree with him re condition though
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Old 22 May 2020, 04:08   #5
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Quote:
Originally Posted by boristhebold View Post
I would not buy it. That much corrosion which has obviously been painted over is way too much, the point of having anodes on the engine is to prevent corrosion, looks to me like the boat has been in the water for alot of time and perhaps the owner didnt keep up with regularly changing the anodes.

You would expect some paint to rub off from the lower leg which is normal over a long time and would just need a respray but for the actual metal of the lower leg to be like that, well ive never seen any like that.

Just look round a marina, look on the dry stack and compare and look at boats on moorings and compare. 500 hours on an engine from 2005 seems very low use to me, thats 33 hours a year use average which is 2.75 hours a month on average. Should not look like that unless the anodes have not been changed and its sat in salt water for a long time.

Walk away.
33 hours per season isn't unheard of, think average hours for a leisure boat is 50? Some my way NEVER seem to move!!
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Old 22 May 2020, 04:14   #6
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Looks like the boat has been sitting in the marina with the leg down. The boat, what's it like? If it's been antifouled, then you know the sort of life its had. Again, the tubes and deck furniture will reveal a lot. Don't write off the engine completely if the boat is mint, but I'd be factoring in a new lower unit in any negotiation. I'd also want to look at the cylinders, do a compression test and check thermostat housing to see if it's been flushed regularly.
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Old 22 May 2020, 04:21   #7
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Looks like the boat has been sitting in the marina with the leg down. The boat, what's it like? If it's been antifouled, then you know the sort of life its had. Again, the tubes and deck furniture will reveal a lot. Don't write off the engine completely if the boat is mint, but I'd be factoring in a new lower unit in any negotiation. I'd also want to look at the cylinders, do a compression test and check thermostat housing to see if it's been flushed regularly.
And poss Electrolytic Corrosion?
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Old 22 May 2020, 04:31   #8
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And poss Electrolytic Corrosion?
yep stray current from a power source unless it was left with the anodes depleted
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Old 22 May 2020, 04:36   #9
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Quote:
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And poss Electrolytic Corrosion?
Possibly. Not sure how many sacrificial anodes the engine has, and have all been replaced? Closer inspection of head will reveal a lot.
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Old 22 May 2020, 06:47   #10
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Walk away.
I wouldn't walk away, I'd run away very quickly. I like a project, but that has been abused.

Buyer's market out there.

Unless as has been said, you get the engine for nearly nothing.

Is that on the Cobra Rib?
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Old 22 May 2020, 08:49   #11
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Or......

The original gearbox has been pranged and someone's manage to pick up another one cheep off Fleabay..

The top of front of the "torpedo" looks like it's been filled or welded up as well.
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Old 22 May 2020, 10:50   #12
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Aside from changing anodes when they have been excessively eroded, the new ones should be well maintained, that's brushed periodically with a Dremel rotating powered tool and a small circular metal brush as to keep them immaculate clean and doing their homework right. Will last much longer than just replacing them...

Happy Boating
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Old 22 May 2020, 12:47   #13
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That lower unit I wouldn't want to rely on.
It's been tarted up by the seller to make it look pretty.
If something as visible as this has been neglected what else has also been neglected.

A Verado is a very complex engine with plenty to go wrong if not cared for.

Only worth considering if it's VERY cheap.
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Old 23 May 2020, 01:48   #14
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As far as I can see there 8 anodes on this engine, 5 alone on the trim assembly. These are useful reference guides for the parts. https://www.boats.net/catalog/mercur...rd-by-hp/250hp
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