I replaced both elbows and one
I replaced both elbows and one exhaust manifold on one of my 1995 454 CID 7.4L MerCruiser engines. I checked the torque after the engines warmed up to normal operating temperature as well as after a half hour cruise. The next day I ran the boat up to wot. When I reduced speed to 3000 rpm the tach for the engine which I recently worked on began to fluctuate and a tapping can be heard around the replaced manifold. I checked all plug wires but none are loose and there is no leaks on the manifolds or risers. Is this problem related to the new manifold or something totally different?
I replaced both elbows and one exhaust manifold on one of my 1995 454 CID 7.4L MerCruiser engines. I checked the torque after the engines warmed up to normal operating temperature as well as after a half hour cruise. The next day I ran the boat up to wot. When I reduced speed to 3000 rpm the tach for the engine which I recently worked on began to fluctuate and a tapping can be heard around the replaced manifold. I checked all plug wires but none are loose and there is no leaks on the manifolds or risers. Is this problem related to the new manifold or something totally different?