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Old 12-11-2012, 09:16 PM
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51timber 51timber is offline
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Replace Rusty Risers and Manifolds?

Looking for your thoughts. Are these risers and manifolds worth saving? I am thinking not, though I have seen a past thread where they were cleaned out once and looked pretty good. My Big concern is even if I replace the risers, I don't know if I can get the bolts off for the manifolds (SEE PIC).

Since the bolts are so rusted on the manifolds, can I cut off the heads of the bolts off and then pull the manifolds off then back the rest of the bolts out with Vise grips???

If I replace the manifolds do I need a sealant of some kind along with the gaskets?

Thanks for your advice.
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Old 12-11-2012, 10:10 PM
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Bouyhead Bouyhead is offline
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Are you running in salt water? If you are shelf life for the manifolds and risers are 5-7 years to play it safe. As far as those manifold bolts go, I've seen worse. Start soaking them a few days before with a good penetrating oil like PB Blaster, they should come out. As far as the gaskets go, I've never used them. Just a light coating of Permatex Hi Temp sealant on the block and manifold and you should be good to go. One more thing, if you are running in salt,anything that has threads should be coated with grease or NeverSeize. Good Luck!
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Old 12-12-2012, 12:09 AM
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Those Manifold's look clogged completely!!
I'm surprised your motor didn't overheat from not being cooled efficiently.
Are you running a thermostat?

It seems the right side bolt can maybe come off with a socket. I would use a punch and hammer the head of the bolts before trying to put a socket first, see what it does....if not cut the heads like you said.

If the manifolds aren't cracked why replace them? Unless your running in salt or really brackish water, I would get them cleaned and blasted, then re-painted.

Last edited by mart_it; 12-12-2012 at 12:18 AM.
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Old 12-12-2012, 05:18 AM
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The boat was used in salt for the first 200 hrs. (7 years) last 2 years 95% fresh now about 300 hrs. Could I take both the risers and manifolds to a machine shop and have them clean them out and polish the mounting surfaces? Or should i just replace everything?
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Old 12-12-2012, 05:41 AM
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Quote:
Originally Posted by 51timber View Post
The boat was used in salt for the first 200 hrs. (7 years) last 2 years 95% fresh now about 300 hrs. Could I take both the risers and manifolds to a machine shop and have them clean them out and polish the mounting surfaces? Or should i just replace everything?
As mart-it said you could clean the manifolds and squeak a little more time out of them, but if it was my boat I would start fresh with new manifolds & risers. Think about changing out the thermostat too and don't be suprised if the thermostst housing crumbles in your hand when you remove it.
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Old 12-12-2012, 07:17 AM
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Ok will do. Being green but willing to get in there and do it myself, where is the thermostat housing?
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Old 12-12-2012, 09:03 AM
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You can also soak them in a bath of evaporust. www.evaporust.com - I cleaned up my 17 year old fresh water manifolds and risers and even ran it thru the block...it's non corrosive... see http://www.mastercraft.com/teamtalk/...=work&page=193 post 1924. Other thread has test on penetrating oil - 50% ATF + 50% acetone showed best results.

+1 on the duty cycle on the manifold/risers - but might be worth talking a close look at the channels in manifold/risers if cleaned up.

Regarding the evaporust - I used a gallon to get my results. You could use it to at least remove the rust from the bolts on the manifold before you applying penetrating solution.

My plan is another gallon of evaporust thru manifold in risers during after next season.

Your manifolds/risers might be a cheaper replacement then buying enough evaporust to fill a vat. But I would at least get a few gallons and run thru block to clean out water jacket.
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Old 12-12-2012, 09:07 AM
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what year boat and which motor?
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Old 12-12-2012, 12:06 PM
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2003 x30 mcx motor
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Old 12-12-2012, 12:13 PM
swardco swardco is offline
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I don't think this is a thread-jack, but here goes.

My boat is a 1991 Prostar 190, freshwater only. Showing some rust stains at "leaking" down from the joint where the risers attach to the manifolds. 99% sure these are the original manifolds and risers.

Sounds like I need to at very least pull the risers and see how things look. I shouldn't be surprised if I need to replace 20+ year old risers/manifolds???
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