Mercruiser 488 with alpha drive gen 1

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Blentz17

Seaman Apprentice
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Feb 13, 2018
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My boat has an old school Mercruiser 488 in it with a first gen outdrive. It’s the one that has the oil plug on the left side. I’m in the process of restoring the boat and when I was tracing the Speedo tube, I noticed that it was cut about half way to the motor.
I have looked everywhere for the speedo connection, there are zero hoses coming from the area of the transom around the exhaust billow where you would normally see the speedo connection. I also don’t see any spot for the plastic connection for the tube.

When looking at the alpha drive I’ve checked the front back and side and don’t see an obvious hole like on the Gen 2s. The Exhaust billow is cracked so I will be pulling the drive to replace it and I was going to take a closer look to see if I could find the connection point.

Does anyone know where the connection point may be or where the tube should exit? I’ve heard in some of the older alpha drives in inside the lower unit but again I’m not sure. Also does anyone know what the size of the hose is, since it is cut I will have to replace it as well. Any advice would be helpful.
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
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