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1986 43 Mercruiser

L

last_dollar

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My 4.3 has about 1300 hours an

My 4.3 has about 1300 hours and runs great. However I am concerned about the exhaust manifolds. They have never been replaced and the motor is a 1986. Should I go ahead and replace or is there some indication of them failing before total failure occurs?? This motor has always been used in fresh water and I fill the block with antifreeze when winterizing. How will I know they are going bad?
 
"The easiest way is to remove

"The easiest way is to remove them and do a visual inspection, and look for any signs of obvious erosion or holes. Tapping all over them (inside and out) with a piece of metal will let you hear any weak spots, too."
 
"In Freshwater,...... Manifold

"In Freshwater,...... Manifolds Last Forever,....
Unless they're Frozen,+ Split....

I see manifolds that are 30, 40 years Old,+ in almost New Condition....."
 
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