Check the rubber bellows and the rubber boot on the lower shift cable.
Shift cable boot can allow a lot of water in for its size. D
"Gary Warner" wrote in message
...


Bob,

I'm not directly knowledgeable about your boat or motor, so
my answers are based on my experience with possibly very
different boats & motors.


How much water would an open valve dump into the bilge.

I believe it could be anywhere from quite a bit to just a drip. On
our engine we have a block-drain valve that can be from full open
to full closed. If we ever closed it but not tightly enough it might
just drip.



Could this be a hull problem even though there is no water ingress when
the boat is docked? Could my movement be forcing water through a crack
in the hull, but remain watertight at dock?


YES. On my fiberglass boat I once hit a sandy bottom. I checked the bilge
and
saw no water. While running to home-dock a LOT of water entered the bilge.
I didn't notice until I slowed down to come into the dock and lots of
water
ran forward. (Scarry!). Then I increased speed trying to get back to
dock before we sank. Turns out I should have gone slowly to dock because
it was the fast speed that was "pumping" the water into the crack. (End
of story: We didn't sink.)


Good Luck.
Gary

"Bob D." wrote in message
...
I tank tested my boat at dry dock to check shifting and to warm up the
block for changing oil and did not notice (but didn't think to look
closely) any additional water in the bilge.

After launching my new project boat we motored, to the dock where we
stayed stayed for about 24 hours before delivering her approximately 15
miles to my marina. During that period, the bilge did not seem to gain
any additional water.

After our delivery trip, I noted a significant amount of water in the
bilge. I manually switched on the bilge pump and noted it pumped for about
10 seconds until dry. I then completely emptied the bilge using a manual
pump and finally a sponge.

I chalked the water ingress up to the slightly rough ride as we had tons
of spray washing over the bow and into the cockpit.

Came back four days later and noted no additional water ingres. Took the
boat out on another 15 mile trip in very calm weather, and noted a bilge
full of water. Obviously the problem occurs only when the boat is
running.

The boat is a 28 foot Wellcraft with all new transom seals powered by a
Mercruiser 260HP (350 GM Block) mated to an Alpha 1 outdrive. The second
time I drained the bilge, I could feel a slightly oily residue in the
water, but not enough to show a sheen. For all I know that may have been
residual oil from a previous leak or spill. I checked my oil and noted
the level and consistancy had not changed.

Here are my questions:

Where are all the water drainage passages or petcock valves on this
block? Is it possible someone left a valve open during the winterization
process? How much water would an open valve dump into the bilge.

Could this be an exhaust manifold or riser problem? If so, can it be
occuring at only higher RPMs?

Could this be a hull problem even though there is no water ingress when
the boat is docked? Could my movement be forcing water through a crack
in the hull, but remain watertight at dock?

What are some other possible causes that would explain this problem?

When I head back up to the boat, I'm going to try running the boat and
noting any ingress at the dock. Running for several minutes above the
2000 RPMs, I'll also try in gear while docked at reduced engine RPMs

As always, any help in solving this scooby mystery is appreciated.

Bob Dimond

I had the exact same thing happen to me. I had some one drive the boat and
I watched the engine compartment. When he gave it full throttle I saw water
start to squirt out of a hose that pumped water into the engine block for
cooling.

When he let off the gas the leak or squirt stopped. After that I made it a
rule to replace all hoses every year. May be an over kill, but sure reduces
chances of getting stuck out somewhere.

Good Luck
Bernie

Hi all

Well I have got to the "bottom" of it.

I had about half a ton of water in the keel (found by hauling her out and
drilling holes in the keel) caused by a small crack behind the keel
(probably from grounding by the previous owner) with the water flowing along
the top of the keel and then finding its way into the boat at that
impossible spot just forward of the bulkhead between the engine room and the
forward cabin (on the hull just a few cm port of centre).

Back in the water next week after drying out everything, fixing the crack,
suring up the bulkhead and reglassing the whole keel top.

I looked everywhere for a leak from motor, fresh water, pumps etc etc and
finally finally believed correctly that it was coming through the hull (as
much as I did not want to believe it ;-)

Hope to have her back in the water and dry next week.

regards Shawn
"Scallywag"
Brisbane Australia


"Bernie Eshleman" wrote in message
...

"Bob D." wrote in message
...
I tank tested my boat at dry dock to check shifting and to warm up the
block for changing oil and did not notice (but didn't think to look
closely) any additional water in the bilge.

After launching my new project boat we motored, to the dock where we
stayed stayed for about 24 hours before delivering her approximately 15
miles to my marina. During that period, the bilge did not seem to gain
any additional water.

After our delivery trip, I noted a significant amount of water in the
bilge. I manually switched on the bilge pump and noted it pumped for
about
10 seconds until dry. I then completely emptied the bilge using a
manual
pump and finally a sponge.

I chalked the water ingress up to the slightly rough ride as we had tons
of spray washing over the bow and into the cockpit.

Came back four days later and noted no additional water ingres. Took
the
boat out on another 15 mile trip in very calm weather, and noted a bilge
full of water. Obviously the problem occurs only when the boat is
running.

The boat is a 28 foot Wellcraft with all new transom seals powered by a
Mercruiser 260HP (350 GM Block) mated to an Alpha 1 outdrive. The
second
time I drained the bilge, I could feel a slightly oily residue in the
water, but not enough to show a sheen. For all I know that may have
been
residual oil from a previous leak or spill. I checked my oil and noted
the level and consistancy had not changed.

Here are my questions:

Where are all the water drainage passages or petcock valves on this
block? Is it possible someone left a valve open during the
winterization
process? How much water would an open valve dump into the bilge.

Could this be an exhaust manifold or riser problem? If so, can it be
occuring at only higher RPMs?

Could this be a hull problem even though there is no water ingress when
the boat is docked? Could my movement be forcing water through a crack
in the hull, but remain watertight at dock?

What are some other possible causes that would explain this problem?

When I head back up to the boat, I'm going to try running the boat and
noting any ingress at the dock. Running for several minutes above the
2000 RPMs, I'll also try in gear while docked at reduced engine RPMs

As always, any help in solving this scooby mystery is appreciated.

Bob Dimond

I had the exact same thing happen to me. I had some one drive the boat
and
I watched the engine compartment. When he gave it full throttle I saw
water
start to squirt out of a hose that pumped water into the engine block for
cooling.

When he let off the gas the leak or squirt stopped. After that I made it
a
rule to replace all hoses every year. May be an over kill, but sure
reduces
chances of getting stuck out somewhere.

Good Luck
Bernie

yes Bob

it stayed dry after I gunked up the hole until I took her out again 24 hours
later and the flow "pumped" the water in. I have posted a complete
explanation in a former post.

regards Shawn
"Scallywag"
Brisbane Australia

"Bob D." wrote in message
...
Hi Shawn,

So did the boat initially stay dry while docked *before* you plugged the
hole? Or did plugging the hole result in leaking a few buckets per hour
while running, but remaining completely dry while docked.

Bob Dimond


In article , "Shawn"
wrote:



To test my observations I plugged the "hole" with sikaflex and it
stopped
the leak completely over a period of 24 hours while in the marina
(completely dry) but underway I took in a few buckets of water in an
hour.