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This is kind of funny now that it is solved but I spent
a lot of time and money fixing it....
The start of the problem was that my muffler finally became
clogged enough that the back pressure blew a hole in my
rusted out exhaust manifold. I had welded up a new muffler
system, bought a new manifold from Moyer and then had to
make some special plumbing mods to connect the head to
the new manifold.
I fired it up and in ran much better but overheated quickly.
I spend a lot of time diving and cleaning the hull entrance,
replacing the old hoses to the water pump, replacing impellers,
buying a new water pump from Moyer, etc.
I finally took the copper pipe between the pump and engine
and made soft hose insert where I could check the water flow
in. It looked great!
I then removed the fitting at the manifold and pressure fed
water BACK through the engine.....that looked great too!!!
Finally, I removed the fitting on the head going to the manifold.
I didn't have gasket when I assembled it so used high temp
red RTV. Poking around, I saw a red blob in the head. I used
tweezers and pulled out a spherical 3/8 inch ball of red RTV
that made perfect "check valve". Whenever I forced water
back though the block it dislodged and water ran....when it
was buttoned up this blob would get stuck in the head fitting!!!
Two weeks and many $ later I am running cool!!!!!!!!!!
a lot of time and money fixing it....
The start of the problem was that my muffler finally became
clogged enough that the back pressure blew a hole in my
rusted out exhaust manifold. I had welded up a new muffler
system, bought a new manifold from Moyer and then had to
make some special plumbing mods to connect the head to
the new manifold.
I fired it up and in ran much better but overheated quickly.
I spend a lot of time diving and cleaning the hull entrance,
replacing the old hoses to the water pump, replacing impellers,
buying a new water pump from Moyer, etc.
I finally took the copper pipe between the pump and engine
and made soft hose insert where I could check the water flow
in. It looked great!
I then removed the fitting at the manifold and pressure fed
water BACK through the engine.....that looked great too!!!
Finally, I removed the fitting on the head going to the manifold.
I didn't have gasket when I assembled it so used high temp
red RTV. Poking around, I saw a red blob in the head. I used
tweezers and pulled out a spherical 3/8 inch ball of red RTV
that made perfect "check valve". Whenever I forced water
back though the block it dislodged and water ran....when it
was buttoned up this blob would get stuck in the head fitting!!!
Two weeks and many $ later I am running cool!!!!!!!!!!