Ran motor (in driveway) without oil in lower unit?

[racerone]

Perhaps what is left over parts of the " shutter assembly "-----Sort of like a check valve to prevent water coming in the exhaust manifold.

 

[islandboy47]

Those are exhaust shutters that go in the top of the exhaust down pipe justbelow the exhaust elbow. Must have been over heated at one time. Replace it

Thank you!

 

[poconojoe]

Just to inform you....
Those exhaust shutters are located inside the exhaust, in the engine bay. They fell off and worked their way all the way down into the drive. This is a common occurrence.

 

[Drcoffee]

Just to inform you....
Those exhaust shutters are located inside the exhaust, in the engine bay. They fell off and worked their way all the way down into the drive. This is a common occurrence.

How often should these be replaced? Is there a recommended maint schedule? I cant imagine a visual inspection would be sufficient when its made of neoprene/rubber.

 

[poconojoe]

How often should these be replaced? Is there a recommended maint schedule? I cant imagine a visual inspection would be sufficient when its made of neoprene/rubber.

They don't need routine replacement. However, if your engine overheats, the rubber parts can melt and the metal parts can fall down into the lower exhaust. If you're lucky, they will continue and end up in the outdrive. If you're not lucky, they will sit at the bottom of the exhaust and can cause a rust through of the wall of the exhaust or a blockage.