Starter Mounting Bolt Size on Mercruiser 3.0

PBRman

Seaman Apprentice
Joined
Aug 31, 2010
Messages
43
Hello,
I recently purchased a Glasstream 172 Cutlass with a 140HP Mercruiser Alpha 1. The 5th or 6th time I took it out, the engine wasn't turning over and when it did turn over it only stayed on for a few seconds. One of the battery leads was completely corroded and replacing that gives full power. While I was back there I realized that the starter was not rigidly connected. It was swiveling about one bolt (the lower one) and the top one appears to missing (or broken off :confused: ?). What size is this bolt and if it is broken off is there a way I can rig the starter temporarily so I can use the boat for the last few weeks of summer and fix it for good over the winter?

I tried a 3/8" and couldn't get it to turn.

Thank you,
-Sean
 
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