If it's got a Primary Raw Water Pump (May be belt driven?) and you've never
changed out the Rubber Impeller...That will be a large part of your problem.
(You may also find impeller blades missing...And you know where they went)

Fresh Water Sailors may get away with an extra season of use out of the
W.P. Impeller...But if you're out on the Salt...You'll put a fresh one in every
Spring as part of your PM.(So easy to do on an Inboard or a I/O compared
to an Outboard)

The risers are a Rust Factory.

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'84 300SD sold
124.128