Boats For Sale:
Winterizing and Found Rust in the Manifolds |
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TG3 
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Joined: May-29-2020 Location: Tyler, Texas Status: Offline Points: 106 |
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 Topic: Winterizing and Found Rust in the ManifoldsPosted: January-08-2021 at 9:43pm |
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I was draining the water from the motor today after changing the oil to prepare for winter (which isn’t terrible here in East Texas). Bought the boat back in April so this is the first time for me to do this. I found lots of good write ups on this forum, so using that info I went to work.
When I pulled those big ole drain plugs on the back of the manifolds, a fair amount of rusty junk came out with the water. I used a light and looked in the drain hole and it appears that there is a lot of rusty scaly looking debris in there. I figure this isn’t a good situation. As far as I know they are original manifolds. What needs to be done? Replace the manifolds or can they be cleaned out somehow? |
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1997 Air/Sport Nautique
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MrMcD
Grand Poobah 
Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3749 |
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Posted: January-09-2021 at 3:24am |
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I don't know how much rust you found or how long it has been since your manifolds have been drained. Maybe the previous owner kept the boat inside a garage and never drained them? It is normal to find rust inside since there is no rust protection in these lake water cooled engines. When I drained my old boat every year I would have to take a nail and poke around the drain plug holes after pulling the plugs. The nail would break the rust and then the water would drain along with a lot of rust. You need to be prepared when you do this to divert the rusty water into a bucket. Rust stains are hard to remove.
I would not worry at all unless your manifolds start leaking. Guys that run in salty water have to buy new manifolds every couple years due to rust damage. In a fresh water boat the manifolds may last the life of your boat. Mark
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8122pbrainard
Grand Poobah
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: January-09-2021 at 5:44am |
Mark, Not really. People living in northern Wi. have learned to deal with rust. Northern Wi. as well as the upper peninsula of Mi. is basically on top of iron and iron was even mined years back up here. Anyway, most of our well water has a very high iron content that stains anything that it come in contact with. Before I built my lake pump (lake water is soft) I watered around the house using well water that would overspray on the house. Before long, I ended up with an orange stained house. I used Iron Out spray liquid and within minutes, the rust stains are gone and without any scrubbing. This stuff works:  I add the powdered form to my water softener. It strips the resin bed of iron. The backwash water looks like Orange Crush!! Trey, What Mark said is true. I agree that what you found is normal.
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TG3
Senior Member
Joined: May-29-2020 Location: Tyler, Texas Status: Offline Points: 106 |
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Posted: January-09-2021 at 11:55am |
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Ok, thanks guys. I will pull the plug back out of the manifold and use my shop vac with my “mini” attachments to get in there and vacuum that crud out.
I didn’t see any rusted through spots, but I will do a closer inspection while I’m cleaning out the manifold.
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1997 Air/Sport Nautique
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MrMcD wrote: