1972 Mercruiser 120hp 4cyl riser

airman1094

Petty Officer 2nd Class
Joined
Mar 30, 2013
Messages
108
I was rooting around the threads and the net and cannot find an answer to my satisfaction. At what point do these need replaced? Mine is pretty corroded on the inside around the top of the bend. Looks like the thin metal between the exhaust passage and the water jacket is rusted through. I'm guessing it needs to go?
 

airman1094

Petty Officer 2nd Class
Joined
Mar 30, 2013
Messages
108
Re: 1972 Mercruiser 120hp 4cyl riser

Yes a long time ago

That's what I was thinking :/. The boat was left to me from a friends dad upon his passing. I'm rather clueless on this engines maintenance history. I guess luckily for me the riser seems worse off than the manifold :D. I'll get a riser on order...gives me time to finish the deck project....thanks!
 
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