in-line 6 overheating problem
Hey folks...I just got a 1977 V-20 cuddy with the Merc in-line 6 that was installed in 2008. It came with the engine that was pulled out as well - both are the 4.1 250 6 cyl. She has almost 3 hours on it and I went to perform all of my routine tests before I take the maiden voyage. Charge the batteries, plug in, and decided I better "yard check" it first. I put the water muffs on and turned on the water after I closed the two ports -one on heat exchanger and the other one on manifold. Boat fired right up but the temp guage started to rise after about 5 mins or so -160 then 200 then 220 - I shut her down. I saw one very small drip of antifreeze on a hose coming from the coolant fill. After it cooled down I opened the ports and nothing drained out. Do I start checking the stern drive water pump or the engine's water pump? Never owned a inboard with the heat exchanger set up before. Help would be great
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