Boats For Sale:
Riser Leak |
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RedSmith 
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Joined: July-20-2015 Location: Asheville, NC Status: Offline Points: 30 |
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 Topic: Riser LeakPosted: August-08-2020 at 8:47am |
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'88 Correctcraft. One riser is leaking from the bottom along the seam. Ideas on whether to replace of try to weld up the cast iron? Thanks.
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: August-08-2020 at 9:31am |
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Arther,
The "seam"? How about posting a picture. The gasket between the manifold and riser is a pretty common problem. Pull the riser and see if it is just the gasket.
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RedSmith
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Posted: August-14-2020 at 9:49am |
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It's the manifold, not the riser, my mistake. I am going to pull the manifold and have the leak welded up. Is there a gasket between the manifold and the engine. I want to get ahead of time. thanks
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8122pbrainard
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Posted: August-14-2020 at 10:04am |
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CC used a couple engines in 88 in different models. Which one do you have? The big or small block?
Did the manifold crack due to not being drained for cold weather? Understand there's the exhaust and cooling water cavities so, I suggest pressure testing after welding to make sure the cooling cavity isn't cracked as well.
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RedSmith
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Posted: August-14-2020 at 10:07am |
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351 Ford with 4 barrel carb. Guess it's the big block
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RedSmith
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Posted: August-14-2020 at 10:11am |
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How is the pressure testing done? Is this something I have to get done at my dealer or is there a way I can do it? I do not expect that the crack is due to freezing. I am very careful in the winterizing, although it's certainly possible. Thanks for the quick reply.
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8122pbrainard
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Posted: August-14-2020 at 10:16am |
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Pressure testing is done by removing the riser, making a block off plate for the top of the manifold where the riser was, adding water to the cooling cavity and then some regulated compressed air. About 10 psi will show water in the exhaust cavity if there's a crack.
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8122pbrainard
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Posted: August-14-2020 at 10:20am |
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Hysteria
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Joined: May-31-2020 Location: Indiana Status: Offline Points: 70 |
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Posted: August-14-2020 at 10:27am |
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Welding cast iron is pretty hit or miss, for the sake of reliability you may want to replace the manifold rather than trying to patch it.
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8122pbrainard
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Posted: August-14-2020 at 10:32am |
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Yes for the unqualfied I agree.
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RedSmith
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Posted: August-14-2020 at 10:56am |
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thanks a lot for the info and advice. Think we'll try welding and testing first.
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RedSmith
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Posted: August-14-2020 at 10:57am |
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Gary S
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Posted: August-14-2020 at 10:59am |
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Doesn’t matter if qualified or unqualified when manifolds are readily available just put that time and effort and money into a new one. Different story if you have something unobtainable imho
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Jonny Quest
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Posted: August-15-2020 at 1:40pm |
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I've had poor luck welding cast iron. I'm with Gary...put your time and ca$h into a new manifold.
JQ
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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8122pbrainard
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Posted: August-15-2020 at 2:41pm |
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Have you been pre heating the parts over 500F?
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SNobsessed
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Posted: August-15-2020 at 8:52pm |
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The manifold's gasket surface is probably pitted. You can machine it down to get past the pits & it should work. If they aren't deep you could even file it if you are good at keeping it flat.
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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Jonny Quest
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Posted: August-15-2020 at 11:36pm |
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I couldn't get the engine block into the oven...  We did try to pre-heat with a propane torch, but the end results were still poor. I'm a very average welder. I need to keep my day job and let the good welders make arcs with cast iron. JQ
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2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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SNobsessed
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Posted: August-16-2020 at 8:41am |
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Cast iron needs to be preheated until it is glowing red. Then stick weld with high-nickel rod. Post heat for slow cooling. It would then need to be machined flat again. Much easier to buy a new one! |
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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Hysteria wrote: