Exhaust rebuild
I have a T30, hull #308, built in '75. After two seasons of overheating - the final stages of which were 5 minutes running time before redline, I bit the bullet and went into the hidden parts of the exhaust system. I found a strange casting at the top of the riser configuration (MMI calls the "inline cooling water exhaust fitting") that had corroded to the point that no water could pass. My guess is that the fitting was original. It was the last thing I checked after trying many other routes. That fitting arrangement is within the bulkhead between the cabin and the head, and requires removing much of the head interior to service. Once I was that far in, I decided to go all new. I replaced the black pipe, purchased MMI's replacement fitting, installed new hoses. The engine runs uniformly, stays happy at cruising RPM, with lots of cooling water exiting the boat.
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