Hi all,

The exhaust flapper valve on my starboard Crusader 454 is very noisy. It is inside the exhaust system somewhere, it is not on the exterior of the hull. Is it possible to replace this? Or is the clicking noise normal?

This engine is a Gen 5 454. The original Mark 4 was replaced under warranty early in the life of the boat. I'm not sure if the exhaust was modified or not.

My port engine had a top end overhaul a couple of years ago according to the prior owner. The mechanic changed the exhaust system and put in a large check valve instead of the standard flapper. The check valve only protects one bank of cylinders (the bank closest to the center of the boat). The exhaust from the other bank is directed at a 45 deg angle laterally instead of straight back to a 90 deg "T". The former mechanic told me that he worked with Crusader to come up with this mod. I'm not sure if this is acceptable or not. He left another 45 deg elbow and a large check valve to do the same mod to the starboard engine. I have not done this yet.

I've only owned the boat for a couple of months. Lot's of projects!



Thanks,
Barry