Mercruiser manifold question

[Francin728]

I'm looking at a 10 year old boat with under 100 hours on it. The vessel has been used in fresh water. The engine and bilge are spotless they show no signs of rust anywhere. Would you change the manifolds on this boat or should they be good to use for a few years?

Normally I would change 10 year old manifolds however I do not know if there would be any reason to with such few hours

 

[Gilded_Splinters]

Manifolds and risers and not an inexpensive proposition and fixing something that might not even be broken is just pointless.

Run the boat, keep an eye on water flow in and out of the engine. Get an IR thermometer to check temps at various places.

If it over heats, don't immediately blame the manifolds. Diagnose and cure. Don't throw parts at the thing.

 

[alldodge]

If its a fresh water boat you should be good and as Gilded mentioned just check them during regular maintenance.

The ones on my 95 Rinker are original and have about 600 hours. The ones on my 94 Formula were removed a couple years ago to install high performance exhaust and they still look good. This is all fresh water

 

[Bondo]

I'm looking at a 10 year old boat with under 100 hours on it. The vessel has been used in fresh water.

Ayuh,.... Pop the risers off,.... I bet they'll look brand new condition after ya clean off the gasket junk,....

It's a Non-issue in sweetwater,....

My houseboat manifolds are 1969 vintage, 'n still just fine,....

 

[Scott Danforth]

FWIW, most fresh water boat motors last about 30-40 years until the hulls rot out and the boat sinks.

my '88 looked like new when I refreshed it in 2012. manifolds needed replacing this spring because its been in brine from 2012 to 2016