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    Mercruiser overheating- How to check raw water pump flow rate

    I have an overheating issue on a 1977 merc 140hp. I replaced the raw water pump but still am having problems. I want to confirm that the water pump is delivering proper flow after my replacement. How much flow rate should i see at the t-stat intake hose? I definitely see flow when I run at...
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    Recommened source for new merc 140 manifold

    Any recommendations regarding make or source for a replacement manifold and riser for a 1977 140 merc. Osco? Barr? Sierra? Tks, Greg
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    Overheating issue continues- merc 140 hp

    To make a long story short- On a tight budget and trying to get a few more years out of a 1977 merc 140 with a rusted through head. Installed a used head, waterpump,t-stat, camshaft. After this is runs cool when hooked to a hose but hot idling at the dock. Installed a new lower unit waterpump...
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    Merc 140 overheating after cam/head/waterpump/thermostat replacement

    I replaced the head, camshaft and thermostat/waterpump on my 1977 140hp mercruiser(gm block). Ran fine in my driveway, with temp not getting above 150 degrees. Took to the lake and ran it at around 2000 rpms. It was a steady 160 degrees for the first 5 minutes of running and then started...
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    Mercruiser 140 project- Smoke coming from throttle bolt hole in exhaust manifold

    I replaced the head, camshaft and waterpump on my 1977 140hp mercruiser(gm block). I am not very mechanical so this has been a challenge. After putting everything together I took it to an auto mechanic to adjust the distributor and set timing. They could not get the boat to idle below 2000 rpms...
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