When is it time to replace exhaust manifold & risers.

[happy]

Hello everyone<br /><br />My boat is 7 years old and used to be in saltwater quite often. It is I/0 454 Mercrusier motor. <br /><br />I heard it said that when the exhaust manifold or riser begins to leak (internally) that the water can actually enter the engine cylinders and do major damage. So how would I know when to replace them before damage is done to my engine. Or is the above incorrect.<br /><br />Thanks in advance.<br /><br />*******Don,t worry be happy *******

 

[Trent]

Re: When is it time to replace exhaust manifold & risers.

Seven years in saltwater..I would replace them NOW! Yes you can do damage to the engine.<br /><br />Or you could remove them and have them pressure checked for leaks.<br /><br />Normal life for them in saltwater is 4-6 years. Lifespan in freshwater up to 20 years.

 

[SeaRay245]

Re: When is it time to replace exhaust manifold & risers.

got any idea how long they last in fresh water?