And what about that thermostat housing? The samples below are classic salt damage.
Note blocked water passage on right.
See matching half, below.
Also note the way the cast iron stratifies which
effectively creates an insulating barrier to the cooling water.
The thermostat above looks normal from this angle.
But after having to chip the thermostat from the housing, note the way it corroded against
the housing and jammed in the half open position. This motor ran cool at idle and
overheated at full throttle.
And if you thought that this thermostat housing was
dropped and that's why the hose fittings of the thermostat housing are broken off... you
are wrong. The cast iron broke off and stuck to the rubber hoses when they were removed.
So what is the outcome of cooling system damage by salt? Serious
internal engine damage is usually the outcome of a neglected cooling system.
(Or maybe just the beginning.)
So how do you prevent or in
reality, slow down the process of salt water damage to a marine
Besides performing regular
maintenance as recommended by the marine engine manufacturers... there are several products that,
when used regularly, help reduce salt damage to boat engines and hardware.
Note: the next three links open in
a new window/tab.
CRC Industries recently bought
"Salt Terminator" and here is their product
page. (Go to corrosion inhibitors, choose salt terminator, and then
hit the compare button)
Products produces a similar item.
And, Volvo Penta makes a system
which, when installed, works on Volvo product, Mercury Marine Bravo
stern drive product, and most inboard engine applications. QL
system info here.