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Old 09-15-2012, 01:58 PM   #13
bglad
Senior Member
 
City: Green Cove Springs, Florida
Join Date: Feb 2012
Posts: 344
Here is a theory that may or may not hold air or water With or without a vented loop your raw water system may drain down and trap air some of which goes out the exhaust and some through the cooling line to the shaft log. Possibly you have a loose hose connection somewhere letting air in or maybe even your exhaust elbow is clogged putting more pressure on the shaft log system. Alternatively it could be something that has been going on occasionally prior just escaping your notice.

I have heard of shaft logs that have a bearing in them being overpressurized by the cooling water flow causing the packing gland to leak inboard. I don't know if your Marine Trader has that type system. If the exhaust elbow is clogged I would think you could tell that by measuring its temperature and the exhaust plumbing. Typically those parts will run between 100 and 130 degress F.
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