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| exhaust manifold on 2005 horizon 230, 110 hours https://www.smwebhead.com/phpBB3/viewtopic.php?f=11&t=14928 |
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| Author: | aallmighty [ Thu Jun 16, 2016 4:59 pm ] |
| Post subject: | exhaust manifold on 2005 horizon 230, 110 hours |
I'm looking at purchasing this boat. It's now 11 years old but only has 110 hours so obviously wasn't used regularly. I had it surveyed today and it runs well with no signs of issues and isn't running hot. However, it has the original exhaust manifolds which apparently are well overdue. It has been docked in saltwater How much do the low hours increase the service life of the exhaust manifolds? Also, is about $2000 the right ballpark for replacing the manifolds and risers? It's the 5.7 350 MAG |
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| Author: | taz42169 [ Thu Jun 16, 2016 5:58 pm ] |
| Post subject: | Re: exhaust manifold on 2005 horizon 230, 110 hours |
I don't think the number of hours/age is as much of a factor if regular maintenance (i.e. Regular flushing/neutra-salt) was performed. Check engine and manifold temperature, flow, any leaks, etc... |
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| Author: | LouC [ Thu Jun 16, 2016 8:01 pm ] |
| Post subject: | Re: exhaust manifold on 2005 horizon 230, 110 hours |
If the boat was docked in saltwater then 11 years is 11 years regardless of the hrs. You should at least remove the risers and inspect the gasket sealing surfaces of both the manifolds and risers. Price it's hard to say. Get it broken down by parts and labor. I've done mine twice 14 years in salt water. Parts about 800 for both sides labor free because I do it. |
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| Author: | deafwish [ Thu Jun 16, 2016 9:21 pm ] |
| Post subject: | Re: exhaust manifold on 2005 horizon 230, 110 hours |
If you buy replacements, buy the newer Dry Joint Manifolds. |
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| Author: | rpengr [ Fri Jun 17, 2016 1:03 pm ] |
| Post subject: | Re: exhaust manifold on 2005 horizon 230, 110 hours |
aallmighty wrote: How much do the low hours increase the service life of the exhaust manifolds? None whatsoever. It's years that mater, not running time. aallmighty wrote: Also, is about $2000 the right ballpark for replacing the manifolds and risers? That might be about right if your paying somebody else, however, you could do it yourself for less than $800 |
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| Author: | aallmighty [ Fri Jun 17, 2016 3:03 pm ] |
| Post subject: | Re: exhaust manifold on 2005 horizon 230, 110 hours |
thanks for the replies! it sounds like it's something i should get taken care of. the seller seems to have kept the boat very well maintained otherwise, so i think i'll move forward with the purchase. now i just have to decide if it's too risky to use it this season or if i should replace them immediately. june is already almost gone so i'm anxious to get out on the water 
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| Author: | LouC [ Fri Jun 17, 2016 4:12 pm ] |
| Post subject: | Re: exhaust manifold on 2005 horizon 230, 110 hours |
This is a risky gamble because they can look great on the outside and be rotted through on the inside. This can put salt water in a cylinder, and if it sits like that a few days the engine could lock up on you. It can also rust exhaust valve stems and cause low compression and rough running. The way most people look at this here is that if they see any rust stains coming from the joint between the riser and manifold, or the temp of the risers is higher than normal, its time. However just because the temp is OK and there are no rust stains on the outside, it does not mean that all is well on the inside. Here the longest I'd run manifolds/risers is 7/8 years, and that would be with regular inspections. |
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| Author: | aallmighty [ Mon Jun 20, 2016 1:16 pm ] |
| Post subject: | Re: exhaust manifold on 2005 horizon 230, 110 hours |
deafwish wrote: If you buy replacements, buy the newer Dry Joint Manifolds. don't all post-2002 mercruisers come with dry joint manifolds? reading around, it seems like this also makes it less risky as it shouldn't be able to leak water into a cylinder. is that true? |
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| Author: | rpengr [ Mon Jun 20, 2016 2:04 pm ] |
| Post subject: | Re: exhaust manifold on 2005 horizon 230, 110 hours |
aallmighty wrote: ...reading around, it seems like this also makes it less risky as it shouldn't be able to leak water into a cylinder. is that true? The dry joint manifolds would need to have Severe rust before they leak into the engine, as it must rust all the way through the inner wall, but it is still possible. They do eliminate the problem of corrosion and/or leakage at the gasket flange. |
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