RedfireSVT
Active member
i went through some mud and sand and now my cooling system appears to be clogged. the water was barely coming out the spout so i changed the water pump impeller and that seemed to help a little but it still isn't flowing anywhere near what it should. i see there is a fitting down on the lower unit housing where i can screw in an adapter for a water hose to flush it out and i'm wondering if anyone has done this? i have a feeling there is sand and mud in my cooling passages so will flushing it get this stuff out or should i take it in for service? what type of pressure should i use when i turn on the hose? i've never had to flush one of these out before but something is clogging the cooling system so i need to get it working properly before i can use my boat. any advice would be appreciated. the boat is a mercury 90/65hp 2 stroke jet drive.