Re: Replacing Exhaust Bellows on Merc 470 with Alpha 1
Because the tubes were intended for big-block engines to reduce backpressure that results from routing the exhaust through the drive. And since the 470 didnt come from the factory with a tube, it came with a bellows, thats how they want to repair it. Because sooner or later someone is going to get water up their exhaust and into the engine, and blame it on the non-standard use of the tube. As professionals, they dont want to take that risk.
My local marina, however, told me they use exhaust tubes on all their jobs, regardless of engine, and will only use an exhaust bellows if the customer specifically requests it, because it saves them the time and works fine 99% of the time.
