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Risers and manifolds

popeye

New member
How do you tell you need need

How do you tell you need need new risers or manifolds before there is catastrophic failure. The only method that I know is if they are too hot to touch they need replacing.
 
" The best way is to remove th

" The best way is to remove the risers and inspect the mating surfaces of both the manifold and the riser as this is where 99% of failures occur. You should also look as the cooling passages. After cleaning surfaces, reassemble using a new gasket. If you have an inboard or an I/O with thru transom exhaust, you can watch the water flow. With the engine running, flow should be the same on both sides.
Good luck. "
 
Is Merc. Service Bulletin 99-

Is Merc. Service Bulletin 99-10 still effective? It says to use sealant on exhaust elbow gaskets but I have seen many posts saying not to use sealant.
 
" Mercury went back to the dry

" Mercury went back to the dry joint and old style gaskets, they tried a new gasket and red lock tight 510 alls it made was a mess. Torque spec on risers and manifolds are 33 lb ft. The new full closed cooling for riser blocks and elbows are in the range of 45lb ft. "
 
MANIFOLDWAREHOUSE.COM
Great


MANIFOLDWAREHOUSE.COM
Great deals and free shipping. I've just "saved" my Crusaders. Risers clogged and cracked. Water in manifolds and scaling in chambers. Pulling heads for an inspect. I'm replacing risers every four years max. Forget hours. I just bought this boat with 150 hours on engines and now this is happening due to previous owners neglect. Boat sat for 3 years with saltwater in risers and who knows where else. Also riggin a freshwater flush for heat exchangers and risers.
 
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