Name this mystery part ?????

HI lets start with the basics. I just picked up 1973 hurricane fun deck, with a 188 hp mercruiser (302 ford 2bbl). Pre alpha 888 stern drive.The one with big eye hook loop on top. engine #3601224 stern drive #3607063. I was working on the cooling system ( thred, cooling raw water???) when I found some thing wedged in the prop between prop and prop hub. It was slightly rubbing on the tab washer and cover nut (64 65) for bearing carrier. To the point, what is this part or is it even part of the boat? the part is a half circle plate. two metal plates with rubber in between and rubber on both outter sides. I have looked over several diagrams for stern drives and can't find anything that looks close. Thanks for the help:noidea:

Re: Name this mystery part ?????

exhaust shutter

located in the exhaust y-pipe, melted and came loose due to engine overheat at some point

Re: Name this mystery part ?????

Exhaust flapper!

Re: Name this mystery part ?????

Arlie said:

.... Pre alpha 888 stern drive.....

Click to expand...

Nope!! The '888' is the engine model (8 cylinder, 188hp). The model of the drive is 'Mercruiser-1', shortened to 'MC-1'....

And that drawing looks suspiciously like a seloc or clymer.. :facepalm:And that's why you can't find your mystery part (exhaust shutter)....

Re: Name this mystery part ?????

You guys are awsome:hail: Should have mentioned noob to BOAT mechanics. Link to diagram for my engine and or stern drive would be greatly appreciated. Looks like dry rot on rubber no indication of melting but what do i know lol . Boat was sitting for two years in the woods be for she was rescued. Also could you explain what this parts function is and what problem not having it will cause. Links for threads to this part to save you some typing would great. Again thanks for taking the time to help educate me and save me a boat load of $$$.

Re: Name this mystery part ?????

Part number 30 in this drawing -> http://www.mercruiserparts.com/Show...r=80&bdesc=EXHAUST+MANIFOLD+AND+EXHAUST+ELBOW

To help reduce water being shot up into the exhaust manifolds if the throttle is cut rapidly coming down from being on the plane).... (or the engine stalls while on the pane - same result)

Chris.........

Re: Name this mystery part ?????

SWEET response. Even better showed where it is located and general price. thanks thanks thanks. any other help on this part very welcome.

Re: Name this mystery part ?????

Sorry, also thanks for explaining the model was having some trouble, don't like sounding like I have no clue and should stick with row boat lol.