"rmcinnis" wrote in message
...

"Paul" wrote in message
. cable.rogers.com...
After taking the boat out just a few times this your I couldn't crank
the
engine anymore. Replaced the starter, removed all spark plugs, cranked
and
fount all cylinders in a 5L V8 OMC 305 engine flooded.

Does this mean that water came out of all 8 cylinders after yo had removed
the plugs?

Since all 8 cyl. were
flooded at the same time with fresh water I do not suspect exhaust.
(verified by creating a closed loop coolant system and eliminating
exhaust
altogether).

I am not sure what you mean here. How does creating a closed loop cooling
eliminate the exhaust? Did you create a closed loop cooling system, run
the
motor and have all 8 cylinders fill with water again?

When you ran the motor this way, did you not have any water running
through
the exhaust system?

My suspect is a leak between cooling passages and cylinders intakes
in the intake manifold. Can't also imagine how a cracked block would
flood
all 8 cyl. at once.

If I understand the situation properly it doesn't sound like the water
enters the cylinder(s) while the engine is running, but rather after the
engine is shut down. If you get water into one cylinder it is easy for it
to migrate to the other cylinders, all it takes is for the intake valve to
be open. The water will flow from the flooded cylinder up into the intake
manifold. At least one other intake valve will be open at the same time
which means it will flood also. When you crank the engine the remaining
cylinders will draw in any water remaining in the intake manifold and they
will flood as well.

You apparently have a leak between the water jacket and either a cylinder
directly or into the intake manifold. This could be from a gasket failure,
either the head gasket (fairly common failure) or the intake manifold
gasket
(pretty rare, but certainly possible). If the failure is in the head
gasket
a compression check should show which cylinder is the problem.

If the problem is not a gasket then I would bet that the intake manifold
has
rusted through to the cooling system. If you still have your "closed
system" rigged up try pressurizing it and seeing if it holds pressure.
This
is a standard test on radiator systems, and you can purchase a small pump
and pressure guage that installs in place of the radiator cap for this
purpose. The cooling system should be able to hold 13 PSI without any
significant loss.

Rod



Cheaper to take the boat to someone to do the pressure test. It is about
$135 for the radiator pressure tester. They have been making these things
for 50 years, and the price is still way to high.

The problem with pressure test is that it won't show the leak placement if
I'm correct. It would be a great after-repair confirmation that everything
is OK though, especially in comparison with the initial one. I have no
testing equip. and can't take the boat to the repair shop (boat is on blocks
now). I've put the engine back together after replacing both head gaskets
and it failed the probe miserably so I have to revisit the issue again.



"Calif Bill" wrote in message
nk.net...

"rmcinnis" wrote in message
...

"Paul" wrote in message
. cable.rogers.com...
After taking the boat out just a few times this your I couldn't crank
the
engine anymore. Replaced the starter, removed all spark plugs, cranked
and
fount all cylinders in a 5L V8 OMC 305 engine flooded.

Does this mean that water came out of all 8 cylinders after yo had
removed
the plugs?

Since all 8 cyl. were
flooded at the same time with fresh water I do not suspect exhaust.
(verified by creating a closed loop coolant system and eliminating
exhaust
altogether).

I am not sure what you mean here. How does creating a closed loop
cooling
eliminate the exhaust? Did you create a closed loop cooling system, run
the
motor and have all 8 cylinders fill with water again?

When you ran the motor this way, did you not have any water running
through
the exhaust system?

My suspect is a leak between cooling passages and cylinders intakes
in the intake manifold. Can't also imagine how a cracked block would
flood
all 8 cyl. at once.

If I understand the situation properly it doesn't sound like the water
enters the cylinder(s) while the engine is running, but rather after the
engine is shut down. If you get water into one cylinder it is easy for
it
to migrate to the other cylinders, all it takes is for the intake valve
to
be open. The water will flow from the flooded cylinder up into the
intake
manifold. At least one other intake valve will be open at the same time
which means it will flood also. When you crank the engine the remaining
cylinders will draw in any water remaining in the intake manifold and
they
will flood as well.

You apparently have a leak between the water jacket and either a
cylinder
directly or into the intake manifold. This could be from a gasket
failure,
either the head gasket (fairly common failure) or the intake manifold
gasket
(pretty rare, but certainly possible). If the failure is in the head
gasket
a compression check should show which cylinder is the problem.

If the problem is not a gasket then I would bet that the intake manifold
has
rusted through to the cooling system. If you still have your "closed
system" rigged up try pressurizing it and seeing if it holds pressure.
This
is a standard test on radiator systems, and you can purchase a small
pump
and pressure guage that installs in place of the radiator cap for this
purpose. The cooling system should be able to hold 13 PSI without any
significant loss.

Rod



Cheaper to take the boat to someone to do the pressure test. It is about
$135 for the radiator pressure tester. They have been making these things
for 50 years, and the price is still way to high.

"Paul" wrote in message
.rogers.com...
The problem with pressure test is that it won't show the leak placement if
I'm correct. It would be a great after-repair confirmation that everything
is OK though, especially in comparison with the initial one. I have no
testing equip. and can't take the boat to the repair shop (boat is on
blocks
now). I've put the engine back together after replacing both head gaskets
and it failed the probe miserably so I have to revisit the issue again.



"Calif Bill" wrote in message
nk.net...

"rmcinnis" wrote in message
...

"Paul" wrote in message
. cable.rogers.com...
After taking the boat out just a few times this your I couldn't
crank
the
engine anymore. Replaced the starter, removed all spark plugs,
cranked
and
fount all cylinders in a 5L V8 OMC 305 engine flooded.

Does this mean that water came out of all 8 cylinders after yo had
removed
the plugs?

Since all 8 cyl. were
flooded at the same time with fresh water I do not suspect exhaust.
(verified by creating a closed loop coolant system and eliminating
exhaust
altogether).

I am not sure what you mean here. How does creating a closed loop
cooling
eliminate the exhaust? Did you create a closed loop cooling system,
run
the
motor and have all 8 cylinders fill with water again?

When you ran the motor this way, did you not have any water running
through
the exhaust system?

My suspect is a leak between cooling passages and cylinders intakes
in the intake manifold. Can't also imagine how a cracked block would
flood
all 8 cyl. at once.

If I understand the situation properly it doesn't sound like the water
enters the cylinder(s) while the engine is running, but rather after
the
engine is shut down. If you get water into one cylinder it is easy
for
it
to migrate to the other cylinders, all it takes is for the intake
valve
to
be open. The water will flow from the flooded cylinder up into the
intake
manifold. At least one other intake valve will be open at the same
time
which means it will flood also. When you crank the engine the
remaining
cylinders will draw in any water remaining in the intake manifold and
they
will flood as well.

You apparently have a leak between the water jacket and either a
cylinder
directly or into the intake manifold. This could be from a gasket
failure,
either the head gasket (fairly common failure) or the intake manifold
gasket
(pretty rare, but certainly possible). If the failure is in the head
gasket
a compression check should show which cylinder is the problem.

If the problem is not a gasket then I would bet that the intake
manifold
has
rusted through to the cooling system. If you still have your "closed
system" rigged up try pressurizing it and seeing if it holds pressure.
This
is a standard test on radiator systems, and you can purchase a small
pump
and pressure guage that installs in place of the radiator cap for this
purpose. The cooling system should be able to hold 13 PSI without any
significant loss.

Rod



Cheaper to take the boat to someone to do the pressure test. It is
about
$135 for the radiator pressure tester. They have been making these
things
for 50 years, and the price is still way to high.





Did you have the heads machined when replacing gaskets? Sometimes the angle
between the head and the intake changes enough that the intake does not seal
to the heads. Pull the intake and look at the gasket to see if it is
compressed all over. Auto parts stores do rent tools and you may be able to
rent a pressure checker.

No, heads were not machined as the gaskets were evenly compressed. I cleaned
them with an emery cloth only and reinstalled them. Neither was the intake
manifold. Everything looked OK. The symptoms did not change after the
reinstallation. Compression was the same, no other surprises. Engine started
and ran OK. Again, I stress that the carb bottom rust looks awfully
suspicious. I do not suspect any head, block issue but I may be wrong. Rust
was present only in the area surrounding the intake: underneath the carb and
along the intake passages (see pictures).



Did you have the heads machined when replacing gaskets? Sometimes the
angle
between the head and the intake changes enough that the intake does not
seal
to the heads. Pull the intake and look at the gasket to see if it is
compressed all over. Auto parts stores do rent tools and you may be able
to
rent a pressure checker.

As a precaution I have made digital pictures of every part that I took out
and what strikes me now is that I've initially missed some watermarks on the
intake's reverse side. I'm quite sure, after reexamining pictures that an
intake is my problem but unfortunately I couldn't previously remove the
intake's bottom shield to be 100% certain. It was riveted to the intake's
bottom part. Intake's gasket looked good enough to eliminate it as a
possibility.


"Calif Bill" wrote in message
k.net...


"Paul" wrote in message
.rogers.com...
The problem with pressure test is that it won't show the leak placement
if
I'm correct. It would be a great after-repair confirmation that
everything
is OK though, especially in comparison with the initial one. I have no
testing equip. and can't take the boat to the repair shop (boat is on
blocks
now). I've put the engine back together after replacing both head
gaskets
and it failed the probe miserably so I have to revisit the issue again.



"Calif Bill" wrote in message
nk.net...

"rmcinnis" wrote in message
...

"Paul" wrote in message

. cable.rogers.com...
After taking the boat out just a few times this your I couldn't
crank
the
engine anymore. Replaced the starter, removed all spark plugs,
cranked
and
fount all cylinders in a 5L V8 OMC 305 engine flooded.

Does this mean that water came out of all 8 cylinders after yo had
removed
the plugs?

Since all 8 cyl. were
flooded at the same time with fresh water I do not suspect
exhaust.
(verified by creating a closed loop coolant system and eliminating
exhaust
altogether).

I am not sure what you mean here. How does creating a closed loop
cooling
eliminate the exhaust? Did you create a closed loop cooling system,
run
the
motor and have all 8 cylinders fill with water again?

When you ran the motor this way, did you not have any water running
through
the exhaust system?

My suspect is a leak between cooling passages and cylinders
intakes
in the intake manifold. Can't also imagine how a cracked block
would
flood
all 8 cyl. at once.

If I understand the situation properly it doesn't sound like the
water
enters the cylinder(s) while the engine is running, but rather after
the
engine is shut down. If you get water into one cylinder it is easy
for
it
to migrate to the other cylinders, all it takes is for the intake
valve
to
be open. The water will flow from the flooded cylinder up into the
intake
manifold. At least one other intake valve will be open at the same
time
which means it will flood also. When you crank the engine the
remaining
cylinders will draw in any water remaining in the intake manifold
and
they
will flood as well.

You apparently have a leak between the water jacket and either a
cylinder
directly or into the intake manifold. This could be from a gasket
failure,
either the head gasket (fairly common failure) or the intake
manifold
gasket
(pretty rare, but certainly possible). If the failure is in the head
gasket
a compression check should show which cylinder is the problem.

If the problem is not a gasket then I would bet that the intake
manifold
has
rusted through to the cooling system. If you still have your
"closed
system" rigged up try pressurizing it and seeing if it holds
pressure.
This
is a standard test on radiator systems, and you can purchase a small
pump
and pressure guage that installs in place of the radiator cap for
this
purpose. The cooling system should be able to hold 13 PSI without
any
significant loss.

Rod



Cheaper to take the boat to someone to do the pressure test. It is
about
$135 for the radiator pressure tester. They have been making these
things
for 50 years, and the price is still way to high.





Did you have the heads machined when replacing gaskets? Sometimes the
angle
between the head and the intake changes enough that the intake does not
seal
to the heads. Pull the intake and look at the gasket to see if it is
compressed all over. Auto parts stores do rent tools and you may be able
to
rent a pressure checker.

"Calif Bill" wrote in message ink.net...
"rmcinnis" wrote in message
...

"Paul" wrote in message
. cable.rogers.com...
After taking the boat out just a few times this your I couldn't crank
the
engine anymore. Replaced the starter, removed all spark plugs, cranked
and
fount all cylinders in a 5L V8 OMC 305 engine flooded.

Does this mean that water came out of all 8 cylinders after yo had removed
the plugs?

Since all 8 cyl. were
flooded at the same time with fresh water I do not suspect exhaust.
(verified by creating a closed loop coolant system and eliminating
exhaust
altogether).

I am not sure what you mean here. How does creating a closed loop cooling
eliminate the exhaust? Did you create a closed loop cooling system, run
the
motor and have all 8 cylinders fill with water again?

When you ran the motor this way, did you not have any water running
through
the exhaust system?

My suspect is a leak between cooling passages and cylinders intakes
in the intake manifold. Can't also imagine how a cracked block would
flood
all 8 cyl. at once.

If I understand the situation properly it doesn't sound like the water
enters the cylinder(s) while the engine is running, but rather after the
engine is shut down. If you get water into one cylinder it is easy for it
to migrate to the other cylinders, all it takes is for the intake valve to
be open. The water will flow from the flooded cylinder up into the intake
manifold. At least one other intake valve will be open at the same time
which means it will flood also. When you crank the engine the remaining
cylinders will draw in any water remaining in the intake manifold and they
will flood as well.

You apparently have a leak between the water jacket and either a cylinder
directly or into the intake manifold. This could be from a gasket failure,
either the head gasket (fairly common failure) or the intake manifold
gasket
(pretty rare, but certainly possible). If the failure is in the head
gasket
a compression check should show which cylinder is the problem.

If the problem is not a gasket then I would bet that the intake manifold
has
rusted through to the cooling system. If you still have your "closed
system" rigged up try pressurizing it and seeing if it holds pressure.
This
is a standard test on radiator systems, and you can purchase a small pump
and pressure guage that installs in place of the radiator cap for this
purpose. The cooling system should be able to hold 13 PSI without any
significant loss.

Rod



Cheaper to take the boat to someone to do the pressure test. It is about
$135 for the radiator pressure tester. They have been making these things
for 50 years, and the price is still way to high.

Why? All you need is a non-relieving cap with 1/4" nipple, available
at NAPA for less than $10, a low pressure gauge, and your air
compressor, even the little tiny ones will work.

"basskisser" wrote in message
om...
"Calif Bill" wrote in message
ink.net...
"rmcinnis" wrote in message
...

"Paul" wrote in message
. cable.rogers.com...
After taking the boat out just a few times this your I couldn't
crank
the
engine anymore. Replaced the starter, removed all spark plugs,
cranked
and
fount all cylinders in a 5L V8 OMC 305 engine flooded.

Does this mean that water came out of all 8 cylinders after yo had
removed
the plugs?

Since all 8 cyl. were
flooded at the same time with fresh water I do not suspect exhaust.
(verified by creating a closed loop coolant system and eliminating
exhaust
altogether).

I am not sure what you mean here. How does creating a closed loop
cooling
eliminate the exhaust? Did you create a closed loop cooling system,
run
the
motor and have all 8 cylinders fill with water again?

When you ran the motor this way, did you not have any water running
through
the exhaust system?

My suspect is a leak between cooling passages and cylinders intakes
in the intake manifold. Can't also imagine how a cracked block would
flood
all 8 cyl. at once.

If I understand the situation properly it doesn't sound like the water
enters the cylinder(s) while the engine is running, but rather after
the
engine is shut down. If you get water into one cylinder it is easy
for it
to migrate to the other cylinders, all it takes is for the intake
valve to
be open. The water will flow from the flooded cylinder up into the
intake
manifold. At least one other intake valve will be open at the same
time
which means it will flood also. When you crank the engine the
remaining
cylinders will draw in any water remaining in the intake manifold and
they
will flood as well.

You apparently have a leak between the water jacket and either a
cylinder
directly or into the intake manifold. This could be from a gasket
failure,
either the head gasket (fairly common failure) or the intake manifold
gasket
(pretty rare, but certainly possible). If the failure is in the head
gasket
a compression check should show which cylinder is the problem.

If the problem is not a gasket then I would bet that the intake
manifold
has
rusted through to the cooling system. If you still have your "closed
system" rigged up try pressurizing it and seeing if it holds pressure.
This
is a standard test on radiator systems, and you can purchase a small
pump
and pressure guage that installs in place of the radiator cap for this
purpose. The cooling system should be able to hold 13 PSI without any
significant loss.

Rod



Cheaper to take the boat to someone to do the pressure test. It is
about
$135 for the radiator pressure tester. They have been making these
things
for 50 years, and the price is still way to high.

Why? All you need is a non-relieving cap with 1/4" nipple, available
at NAPA for less than $10, a low pressure gauge, and your air
compressor, even the little tiny ones will work.

Some people like to use the tool designed for the job. For less than $10
and no time expended, you can rent the tool.

"Calif Bill" wrote in message link.net...
"basskisser" wrote in message
om...
"Calif Bill" wrote in message
ink.net...
"rmcinnis" wrote in message
...

"Paul" wrote in message
. cable.rogers.com...
After taking the boat out just a few times this your I couldn't
crank
the
engine anymore. Replaced the starter, removed all spark plugs,
cranked
and
fount all cylinders in a 5L V8 OMC 305 engine flooded.

Does this mean that water came out of all 8 cylinders after yo had
removed
the plugs?

Since all 8 cyl. were
flooded at the same time with fresh water I do not suspect exhaust.
(verified by creating a closed loop coolant system and eliminating
exhaust
altogether).

I am not sure what you mean here. How does creating a closed loop
cooling
eliminate the exhaust? Did you create a closed loop cooling system,
run
the
motor and have all 8 cylinders fill with water again?

When you ran the motor this way, did you not have any water running
through
the exhaust system?

My suspect is a leak between cooling passages and cylinders intakes
in the intake manifold. Can't also imagine how a cracked block would
flood
all 8 cyl. at once.

If I understand the situation properly it doesn't sound like the water
enters the cylinder(s) while the engine is running, but rather after
the
engine is shut down. If you get water into one cylinder it is easy
for it
to migrate to the other cylinders, all it takes is for the intake
valve to
be open. The water will flow from the flooded cylinder up into the
intake
manifold. At least one other intake valve will be open at the same
time
which means it will flood also. When you crank the engine the
remaining
cylinders will draw in any water remaining in the intake manifold and
they
will flood as well.

You apparently have a leak between the water jacket and either a
cylinder
directly or into the intake manifold. This could be from a gasket
failure,
either the head gasket (fairly common failure) or the intake manifold
gasket
(pretty rare, but certainly possible). If the failure is in the head
gasket
a compression check should show which cylinder is the problem.

If the problem is not a gasket then I would bet that the intake
manifold
has
rusted through to the cooling system. If you still have your "closed
system" rigged up try pressurizing it and seeing if it holds pressure.
This
is a standard test on radiator systems, and you can purchase a small
pump
and pressure guage that installs in place of the radiator cap for this
purpose. The cooling system should be able to hold 13 PSI without any
significant loss.

Rod



Cheaper to take the boat to someone to do the pressure test. It is
about
$135 for the radiator pressure tester. They have been making these
things
for 50 years, and the price is still way to high.

Why? All you need is a non-relieving cap with 1/4" nipple, available
at NAPA for less than $10, a low pressure gauge, and your air
compressor, even the little tiny ones will work.

Some people like to use the tool designed for the job. For less than $10
and no time expended, you can rent the tool.

The tool I've described IS "designed for the job". For less than $10 you can OWN it.

Pressure test is definitely a way to go. I'll see whether I can do it with
the addition of some simple tools. What I'm not sure is how will I be able
to find out what the exact spot is. Even without doing it I know the engine
will fail the test but I'm not exactly sure how to proceed afterwards.


Why? All you need is a non-relieving cap with 1/4" nipple, available
at NAPA for less than $10, a low pressure gauge, and your air
compressor, even the little tiny ones will work.

Some people like to use the tool designed for the job. For less than
$10
and no time expended, you can rent the tool.

The tool I've described IS "designed for the job". For less than $10 you
can OWN it.

"basskisser" wrote in message


Why? All you need is a non-relieving cap with 1/4" nipple, available
at NAPA for less than $10, a low pressure gauge, and your air
compressor, even the little tiny ones will work.

I am not sure how you would make that tool. It wouldn't be hard to drill a
clearance hole in the outer bracket of the radiator cap. The pipe, as you
describe, would probably fit down the center of the pressure relief spring
okay. What I don't see is how you fasten the pipe to the seal surface
without destroying the sealing surface and/or gasket and make sure that it
doesn't become a source of leaks.

Since he would need to be jury-rigging the closed loop system he could just
simply not use a radiator cap. Simply close the system with a pair of hose
barbs fitted into regular old pipe. With a Tee and some reducer bushings
you could arrange for a tire valve and pressure guage with ease.

Just be real careful with the pressure if you don't have the pressure relief
of the radiator cap. I would recommend a hand pump instead of an air
compressor.

Rod