Should I inspect/replace my manifold risers?

[YN2(SS)]

1989 Mercruiser 5.0 LX Alpha One

I have inferred from several threads on here that after 5 seasons of use, I should replace my exhaust manifold risers ( as well as gaskets), no questions asked, as preventative maintenance to preclude getting a crack in them and water in the oil etc.

Is this good practice? What about removing them, having them dipped, planed and checked for cracks at a machine shop and then painted and reinstalled with new gaskets?

Im planning on doing this prior to winterization.

I dont have oil in my water and dont ever want to. I jus bought this boat last spring, one riser (starboard) runs hotter than the other and has more surface rust on it. The port one appears to be newer.

Any thoughts?

 

[Levinz11]

Re: Should I inspect/replace my manifold risers?

I think that 4-5 year "rule" is for salt water applications. My mani/riser combo batwing OMC crap is 24 years old! KNocking on the table real hard as I type this

 

[Bondo]

Re: Should I inspect/replace my manifold risers?

1989 Mercruiser 5.0 LX Alpha One

I have inferred from several threads on here that after 5 seasons of use, I should replace my exhaust manifold risers ( as well as gaskets), no questions asked, as preventative maintenance to preclude getting a crack in them and water in the oil etc.

Is this good practice? What about removing them, having them dipped, planed and checked for cracks at a machine shop and then painted and reinstalled with new gaskets?

Im planning on doing this prior to winterization.

I dont have oil in my water and dont ever want to. I jus bought this boat last spring, one riser (starboard) runs hotter than the other and has more surface rust on it. The port one appears to be newer.

Any thoughts?

Ayuh,.... That's a rule of thumb for Saltwater boaters,...

Not much brine in Illinois,...

Here on the other end of the Sweetwater Seas,... 40 years is not unheard of,...

freezin', 'n Bustin' manifolds kills 'em up here... Not rust, 'n corrosion,....

 

[straightleg]

Re: Should I inspect/replace my manifold risers?

Mine are 23 years old...My boat got to stay in a pole barn its whole life


SL

 

[YN2(SS)]

Re: Should I inspect/replace my manifold risers?

Sounds good to me guys! Thanks for all the input. I'll cross that off my list and go to the other stuff.