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Old 10-22-2016, 09:24 PM   #5
MYMT
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City: Stuart
Country: USA
Vessel Name: Caretta
Vessel Model: Marine Trader Sedan
Join Date: Apr 2012
Posts: 86
if the vented loop is leaking, it will diminish the amount of cooling water introduced to the shaft seal, (in my case the packing gland and cutlass bearing), as the vented loop is not designed in the system to leak, only to eliminate a siphon back into the manifold. Probably wouldn't make a huge difference as some boats don't have water injected there anyway, but I'm not sure. The engine won't overheat, but possibly the area that you describe as a 'shaft seal' may not cool as designed...
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