Manifolds and risers

fourreins · Post by **fourreins** » Thu Dec 16, 2010 8:46 am

I bought a 10.8 international about three years ago and am just curious what you all would do. The boat has FWC 454 Crusaders. I also know that the boat was always used in Freshwater. The boat runs fine with no overheating issues. I am thinking the Riser and manifolds are original equipment. Also, boat has about 350 original hours. Ihave been told that the manifolds should last the life of the engines with it being FWC??? Not sure what to do about the risers either. DOn't really have any leaking at the gaskets. Should I wait for some issues before I maybe replace the risers? What are your thoughts on the riser and the manifolds? Would I see some signs that it is time to replace?

Danny Bailey · Post by **Danny Bailey** » Thu Dec 16, 2010 12:00 pm

The big factor is whether the manifolds and risers are freshwater or seawater cooled.

randyp · Post by **randyp** » Thu Dec 16, 2010 1:14 pm

For what this is worth, my F26 has been RWC in fresh water since new in 1977. Same risers, same manifolds, and no problems. Original engine, etc too. Over 1000 hours on the engine, single Chrysler Marine 318.

fourreins · Post by **fourreins** » Thu Dec 16, 2010 3:46 pm

The manifolds are FWC....

prowlersfish · Post by **prowlersfish** » Thu Dec 16, 2010 4:36 pm

The manifolds should last a long tine being FWC ( coolant running thru them ) risers last about 5 years in salt your in fresh water so at least twice that . yo could pull and clean the risers and inspect them to be safe.

On the manifolds keep clean coolant in them and keep them painted thats all you can do .

rossjo · Post by **rossjo** » Thu Dec 16, 2010 4:50 pm

You can look for old (no longer made) stainless risers and never worry again.

foofer b · Post by **foofer b** » Thu Dec 16, 2010 5:38 pm

Not to hijack the post, but what if I have RWC engine, but after each use I always flush with fresh water while running it 15 minutes. It was rebuilt with new manifolds and risers in '06. Should I change them out this year?

BobCT · Post by **BobCT** » Thu Dec 16, 2010 7:38 pm

I have an '88 FWC 454's too (800 hours). I got a great deal on new manifolds so I changed those along with the risers and elbows when I got the boat last year.

I'm pretty sure I threw away four good manifolds

They looked like new inside so it was probably a waste. I would keep those and replace the risers and elbows. This is the type of a thing you should do BEFORE you have a problem. Everything is good until the minute it fails

If you try and squeeze the last hour out of them the results can be catastrophic.

Bob

prowlersfish · Post by **prowlersfish** » Thu Dec 16, 2010 7:55 pm

foofer b wrote:Not to hijack the post, but what if I have RWC engine, but after each use I always flush with fresh water while running it 15 minutes. It was rebuilt with new manifolds and risers in '06. Should I change them out this year?

your adding years of life to them , i would inspect them an go from there

fourreins · Post by **fourreins** » Thu Dec 16, 2010 11:29 pm

I was reading somearticles on the web and it looks like the freshwater cooled 454 Crusader engine may also include the riser in the closed system??? Anyone know????

foofer b · Post by **foofer b** » Fri Dec 17, 2010 6:23 am

Thanks Bob, that is what I would have thought.
Prowler, how do I inspect them?

Danny Bailey · Post by **Danny Bailey** » Fri Dec 17, 2010 4:50 pm

I had installed a freshwater flush system on my 440's before I repowered. I knew I would only run them a year or two but it is too easy to install a flusher to not do it

rbcool · Post by **rbcool** » Fri Dec 17, 2010 5:26 pm

Has anybody tried the Neutra-Salt system??

prowlersfish · Post by **prowlersfish** » Fri Dec 17, 2010 7:23 pm

fourreins wrote:I was reading somearticles on the web and it looks like the freshwater cooled 454 Crusader engine may also include the riser in the closed system??? Anyone know????

Just the manafold not the riser ,

kevinz · Post by **kevinz** » Sat Dec 18, 2010 9:14 am

We have a few customers with the Neutra-Salt system.. Does it work? who knows. I do know the stuff is high dollar per gallon. the solonoids get clogged, and if any part of the system gets a leak, it will corrode anything it touches.

Trojan Boat Forum

Manifolds and risers

Manifolds and risers

for what it's worth