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Concerns about rust and corrosion

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SVZara View Drop Down
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    Posted: 03 September 2019 at 21:02
Hey guys/gals,

I am looking at a used 575 and the broker sent me a lot of detailed photos.  He didn't try to hide the warts, which I guess is a good thing, but some images have raised my concern.  Perhaps you guys could take a look at what I am seeing and have some ideas if these are concerning.  There seems to be a lot of rust in the engine bay for such a new boat, and the generator bracket looks like the aluminum is corroding (or whatever you call the white powdery look). Seems like oxidation. What are your thoughts?  Pics below...












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Black Diamond View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Black Diamond Quote  Post ReplyReply Direct Link To This Post Posted: 03 September 2019 at 21:40
It looks like something sprayed all over the engine and the corrosion is what you are seeing.    Does it look like anything in the cooling system has been replaced?   Hoses, clamps?   or even something like the stuffing box/shaft seal?  The rest doesn't seem that bad, actually.   How old is the 575
Rick
S/V Black Diamond
Hanse 575 Build #192, Hull# 161
Newport, RI
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kipwrite View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kipwrite Quote  Post ReplyReply Direct Link To This Post Posted: 03 September 2019 at 21:42
Iíd suspect the salt water pump on that Panda generator developed a leak at some point, and gave everything below a good salt water rinse - judging by the rust on the Panda engine mounts. Have a peek inside the generator case. In any event this wasnít very well tidied up. That would bother me, but in my opinion itís not a show stopper. 


Kipwrite
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SVZara View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SVZara Quote  Post ReplyReply Direct Link To This Post Posted: 03 September 2019 at 22:51
When I asked the broker about the rust/corrosion, he said:  "There was a leakage on the sniffer valve of main engine dripping on that area".  I'm not sure what the sniffer valve is.  Definately seems lke salt water in the mix.  I am guessing has to do with the raw water coolling maybe?  If it seems minor, thats good if its cosmetic.  This can get cleaned up.  It would bother me too having it in that state.  Otherwise, the boat seems ok.  I am going to be in Europe to check the boat out in October.  If all goes well we will start the process with survey, etc... 
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Wayne's World View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wayne's World Quote  Post ReplyReply Direct Link To This Post Posted: 04 September 2019 at 08:39
SVzara,

I gather the broker may think the SW leak came from the anti-siphon valve on the main engine cooling system. As Kipwrite suggested the leak onto the drive shaft coupling is more likely to have come from the SW pump on the Fischer Panda. The vents on the FP are on the bottom of the sound enclosure. The SW drips out of these vent holes onto the coupling and when the shaft is running it throws salt around that area. This would not account for the rust etc on the forward end of the engine. If you remove the sound enclosure shells you will probably find there is lots of salt build up or evidence of previous salt build up starting from the SW cooling pump. Maybe the rust of the forward end of the engine has come from SW leaking from the Jabsco SW pump? In one of the photos it looks like the SW has caused corrosion on the alternator. I would look closely at the alternator condition because SW on the windings will eventually cause it to fail. Budget about E700 to source and replace. Although the rust and corrosion looks bad most of the damage can be fairly easily cleaned up and is mainly cosmetic (apart from the alternator).
Wayne W
Cruising, currently in the Mediterranean but heading across the Atlantic early 2020
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Black Diamond View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Black Diamond Quote  Post ReplyReply Direct Link To This Post Posted: 04 September 2019 at 09:55
As Wayne said,  it could have come from two improperly repaired or replaced impellers.   One on the FP generator, and one for the main engine.    If you don't make sure the gasket is sealed properly, you could get spray in these places.    One over the shaft and generator mounts, the other over the belt area, etc..

If its cosmetic, then just clean it up and put a light coating on the metal and it should be fine.


Rick
S/V Black Diamond
Hanse 575 Build #192, Hull# 161
Newport, RI
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Konstantin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Konstantin Quote  Post ReplyReply Direct Link To This Post Posted: 04 September 2019 at 12:21
I recon this amount of spray all over the engine compartment and the damage it caused, including soaking the plywood above the prop shaft can be due to the shaft seal catastrophically leaking into the hot engine compartment for quite a while, with engine running, flooding the engine bilge up to the point when both the shaft (two plastic discs) and front of the engine (rotating belt and wheels) started throwing SW on hot metal surfaces, corroding them instantly. While the damage appears to be cosmetic except for the alternator which will probably fail sooner rather than later, all these metal parts will never be rust-free again unless you change them completely. Some of these are critical - hose clamps for one, wires (the ends of the wires soak up SW especially when hot). Some will just never stop to rust until they structurally fail or you change them.
I would definitely get a quote for changing all these corroded metal and lower your offer for this amount. And then actually changed them all.
SY "MARIA" 2013 Hanse "facelift" 445#205, sailing in Greece & Turkey
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SVZara View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SVZara Quote  Post ReplyReply Direct Link To This Post Posted: 04 September 2019 at 14:51
Should the aluminum bracket that the genset sits on get replaced as well?
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Wayne's World View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wayne's World Quote  Post ReplyReply Direct Link To This Post Posted: 04 September 2019 at 14:56
SVZara,

I think you will find the bracket is galvanized steel not aluminum. So, no it would not need replacing.
Wayne W
Cruising, currently in the Mediterranean but heading across the Atlantic early 2020
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Black Diamond View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Black Diamond Quote  Post ReplyReply Direct Link To This Post Posted: 05 September 2019 at 01:42
I've always been able to take emery cloth, some kind of rust removing gel, or just scour the affected surface and then coat it to get it to an acceptable state.    The comment from Konstantin about "never be corrosion free" is one I'd like to know more on.  Why do you need to replace all the parts again?   Is some irreversible process started which weakens the metal?   If so,   is this  a material issue (its going to fail in 2 years versus 75 years, or is 75 years now 74?)?

I've seen plenty of boats with motor mount salt spray issues and it was never an issue that the surveyor said needed to be dealt with by "replacement".   They all focused on making sure the cause of the problem was dealt with and that the damage caused by that problem was not severe...


Rick
S/V Black Diamond
Hanse 575 Build #192, Hull# 161
Newport, RI
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