Hi,

I have a 94' Chaparral w/a 5.7L Mercruiser 350MAG. Looking for some advice
on pinpointing a problem. Here's the story:

Last year everything was running fine. Beginning of this season i had the
outdrive/impeller serviced. After dropping it in the water i noticed that
one Riser gets extremely hot. This is def not the norm. The temp is
constant at 160 (thermostat setting). I took off the entire thermostat
housing (everything was fine), replaced the thermostat, took off the Riser
(everything fine), checked the exhaust flaps (everything fine), and all
hoses looked good. I can't figure out what could be the problem. My two
thoughts, either something happened over the course of the winter, but what?
or when the marina serviced the outdrive something got screwed up. but if
it was an water intake problem wouldn't both risers get really hot?

Any help troubleshooting is greatly appreciated.

Thanks!!

Matt wrote:
Hi,

I have a 94' Chaparral w/a 5.7L Mercruiser 350MAG. Looking for some
advice on pinpointing a problem. Here's the story:

Last year everything was running fine. Beginning of this season i had
the outdrive/impeller serviced. After dropping it in the water i
noticed that one Riser gets extremely hot. This is def not the norm.
The temp is constant at 160 (thermostat setting). I took off the entire
thermostat housing (everything was fine), replaced the thermostat, took
off the Riser (everything fine), checked the exhaust flaps (everything
fine), and all hoses looked good. I can't figure out what could be the
problem. My two thoughts, either something happened over the course of
the winter, but what? or when the marina serviced the outdrive something
got screwed up. but if it was an water intake problem wouldn't both
risers get really hot?

Any help troubleshooting is greatly appreciated.

Thanks!!



The first thing to be suspicious of is the work that was just done. Did
you store the engine wet or dry? Dry storage can cause excessive
internal rusting. Rust particles could be clogging a riser or the riser
itself has rusted out and clogged. If your engine has metering balls in
the thermostat housing, they could be worn or where they seat on the
housing could be eroded. Is it possible that you have 2 hoses reversed.

How old are your manifolds/risers? Either a clogged riser or manifold on
that bank, or the water pump isn't pumping enough volume to reach both
risers.Hot riser= no coolant flow. You need to find out before running
it again. See:
http://www.seanet.com/~jasonrnorth/mceo1.html
For an in depth look at what happens when a manifold fails.
JR


Matt wrote:
Hi,

I have a 94' Chaparral w/a 5.7L Mercruiser 350MAG. Looking for some
advice on pinpointing a problem. Here's the story:

Last year everything was running fine. Beginning of this season i had
the outdrive/impeller serviced. After dropping it in the water i
noticed that one Riser gets extremely hot. This is def not the norm.
The temp is constant at 160 (thermostat setting). I took off the entire
thermostat housing (everything was fine), replaced the thermostat, took
off the Riser (everything fine), checked the exhaust flaps (everything
fine), and all hoses looked good. I can't figure out what could be the
problem. My two thoughts, either something happened over the course of
the winter, but what? or when the marina serviced the outdrive something
got screwed up. but if it was an water intake problem wouldn't both
risers get really hot?

Any help troubleshooting is greatly appreciated.

Thanks!!



--
--------------------------------------------------------------
Home Page: http://www.seanet.com/~jasonrnorth

It was stored with coolant run through (same as i do every year) There are
no metering balls in the housing, and i toolk the entire housing apart,
everything looks good. Hose's are definately not reversed.
Manifolds/Risers are only 3 years old, fresh water use only. I inspected
the riser and looks good.


"jim 0010" wrote in message
...
Matt wrote:
Hi,

I have a 94' Chaparral w/a 5.7L Mercruiser 350MAG. Looking for some
advice on pinpointing a problem. Here's the story:

Last year everything was running fine. Beginning of this season i had
the outdrive/impeller serviced. After dropping it in the water i noticed
that one Riser gets extremely hot. This is def not the norm. The temp
is constant at 160 (thermostat setting). I took off the entire
thermostat housing (everything was fine), replaced the thermostat, took
off the Riser (everything fine), checked the exhaust flaps (everything
fine), and all hoses looked good. I can't figure out what could be the
problem. My two thoughts, either something happened over the course of
the winter, but what? or when the marina serviced the outdrive something
got screwed up. but if it was an water intake problem wouldn't both
risers get really hot?

Any help troubleshooting is greatly appreciated.

Thanks!!



The first thing to be suspicious of is the work that was just done. Did
you store the engine wet or dry? Dry storage can cause excessive internal
rusting. Rust particles could be clogging a riser or the riser itself has
rusted out and clogged. If your engine has metering balls in the
thermostat housing, they could be worn or where they seat on the housing
could be eroded. Is it possible that you have 2 hoses reversed.

Matt wrote:
It was stored with coolant run through (same as i do every year) There
are no metering balls in the housing, and i toolk the entire housing
apart, everything looks good. Hose's are definately not reversed.
Manifolds/Risers are only 3 years old, fresh water use only. I
inspected the riser and looks good.


"jim 0010" wrote in message
...
Matt wrote:
Hi,

I have a 94' Chaparral w/a 5.7L Mercruiser 350MAG. Looking for some
advice on pinpointing a problem. Here's the story:

Last year everything was running fine. Beginning of this season i
had the outdrive/impeller serviced. After dropping it in the water i
noticed that one Riser gets extremely hot. This is def not the
norm. The temp is constant at 160 (thermostat setting). I took off
the entire thermostat housing (everything was fine), replaced the
thermostat, took off the Riser (everything fine), checked the exhaust
flaps (everything fine), and all hoses looked good. I can't figure
out what could be the problem. My two thoughts, either something
happened over the course of the winter, but what? or when the marina
serviced the outdrive something got screwed up. but if it was an
water intake problem wouldn't both risers get really hot?

Any help troubleshooting is greatly appreciated.

Thanks!!



The first thing to be suspicious of is the work that was just done.
Did you store the engine wet or dry? Dry storage can cause excessive
internal rusting. Rust particles could be clogging a riser or the
riser itself has rusted out and clogged. If your engine has metering
balls in the thermostat housing, they could be worn or where they seat
on the housing could be eroded. Is it possible that you have 2 hoses
reversed.

I would go to the water pump and check it carefully, including the part
the copper tube sticks out, of in the upper unit. It might have melted
during an overheat episode. Also make sure the guy used the right
rebuild kit. Make sure the 3/4 diam water hose in the bell housing isn't
kinked or cracked. Make sure you don't have mussels or vegatation
clogging the water pickup vents. Is one manifold much hotter than the
other? Make sure your timing is set correctly. Make sure some broken
impeller pieces aren't blocking the power steering cooler. Are your
exast shutters clacking noticeably?

I called the marina that did my drive service (they said it prob isn't that
because both would be overheating) i have never had a prob w/ them in the
past, but i expect them to say that over the phone becuase there can be 10
other things wrong w/ it too.. There is no mussles or anything growing
(it's dry docked all year long and in fresh water) manifolds are running
about the same the one where the riser is very hot is a little warmer but i
guess that would be as a result of right?

The flaps sound fine, i hear no clacking...

I can check the cooler, but again, at the end of last season all was fine,
winterized it, then had it serviced few weeks ago, then the start of my
problems...

I pulled the hoses to the risers while the engine was on to check the flow,
the 'hot' riser had a little less flow but nothing major, this was all while
on the earmuffs...

I'm clueless... I am dreading bringing it back to the marina the TELLING
them to redo the impeller or recheck it.. I really don't want to do it
myself, it's such a pain in the ass and i need two people for it...


"jim 0010" wrote in message
...
Matt wrote:
It was stored with coolant run through (same as i do every year) There
are no metering balls in the housing, and i toolk the entire housing
apart, everything looks good. Hose's are definately not reversed.
Manifolds/Risers are only 3 years old, fresh water use only. I inspected
the riser and looks good.


"jim 0010" wrote in message
...
Matt wrote:
Hi,

I have a 94' Chaparral w/a 5.7L Mercruiser 350MAG. Looking for some
advice on pinpointing a problem. Here's the story:

Last year everything was running fine. Beginning of this season i had
the outdrive/impeller serviced. After dropping it in the water i
noticed that one Riser gets extremely hot. This is def not the norm.
The temp is constant at 160 (thermostat setting). I took off the
entire thermostat housing (everything was fine), replaced the
thermostat, took off the Riser (everything fine), checked the exhaust
flaps (everything fine), and all hoses looked good. I can't figure out
what could be the problem. My two thoughts, either something happened
over the course of the winter, but what? or when the marina serviced
the outdrive something got screwed up. but if it was an water intake
problem wouldn't both risers get really hot?

Any help troubleshooting is greatly appreciated.

Thanks!!



The first thing to be suspicious of is the work that was just done. Did
you store the engine wet or dry? Dry storage can cause excessive
internal rusting. Rust particles could be clogging a riser or the riser
itself has rusted out and clogged. If your engine has metering balls in
the thermostat housing, they could be worn or where they seat on the
housing could be eroded. Is it possible that you have 2 hoses reversed.

I would go to the water pump and check it carefully, including the part
the copper tube sticks out, of in the upper unit. It might have melted
during an overheat episode. Also make sure the guy used the right rebuild
kit. Make sure the 3/4 diam water hose in the bell housing isn't kinked or
cracked. Make sure you don't have mussels or vegatation clogging the water
pickup vents. Is one manifold much hotter than the other? Make sure your
timing is set correctly. Make sure some broken impeller pieces aren't
blocking the power steering cooler. Are your exast shutters clacking
noticeably?

Matt wrote:
I called the marina that did my drive service (they said it prob isn't
that because both would be overheating) i have never had a prob w/ them
in the past, but i expect them to say that over the phone becuase there
can be 10 other things wrong w/ it too.. There is no mussles or
anything growing (it's dry docked all year long and in fresh water)
manifolds are running about the same the one where the riser is very hot
is a little warmer but i guess that would be as a result of right?

The flaps sound fine, i hear no clacking...

I can check the cooler, but again, at the end of last season all was
fine, winterized it, then had it serviced few weeks ago, then the start
of my problems...

I pulled the hoses to the risers while the engine was on to check the
flow, the 'hot' riser had a little less flow but nothing major, this was
all while on the earmuffs...

I'm clueless... I am dreading bringing it back to the marina the
TELLING them to redo the impeller or recheck it.. I really don't want to
do it myself, it's such a pain in the ass and i need two people for it...


"jim 0010" wrote in message
...
Matt wrote:
It was stored with coolant run through (same as i do every year)
There are no metering balls in the housing, and i toolk the entire
housing apart, everything looks good. Hose's are definately not
reversed. Manifolds/Risers are only 3 years old, fresh water use
only. I inspected the riser and looks good.


"jim 0010" wrote in message
...
Matt wrote:
Hi,

I have a 94' Chaparral w/a 5.7L Mercruiser 350MAG. Looking for
some advice on pinpointing a problem. Here's the story:

Last year everything was running fine. Beginning of this season i
had the outdrive/impeller serviced. After dropping it in the water
i noticed that one Riser gets extremely hot. This is def not the
norm. The temp is constant at 160 (thermostat setting). I took off
the entire thermostat housing (everything was fine), replaced the
thermostat, took off the Riser (everything fine), checked the
exhaust flaps (everything fine), and all hoses looked good. I
can't figure out what could be the problem. My two thoughts,
either something happened over the course of the winter, but what?
or when the marina serviced the outdrive something got screwed
up. but if it was an water intake problem wouldn't both risers
get really hot?

Any help troubleshooting is greatly appreciated.

Thanks!!



The first thing to be suspicious of is the work that was just done.
Did you store the engine wet or dry? Dry storage can cause excessive
internal rusting. Rust particles could be clogging a riser or the
riser itself has rusted out and clogged. If your engine has metering
balls in the thermostat housing, they could be worn or where they
seat on the housing could be eroded. Is it possible that you have 2
hoses reversed.

I would go to the water pump and check it carefully, including the
part the copper tube sticks out, of in the upper unit. It might have
melted during an overheat episode. Also make sure the guy used the
right rebuild kit. Make sure the 3/4 diam water hose in the bell
housing isn't kinked or cracked. Make sure you don't have mussels or
vegatation clogging the water pickup vents. Is one manifold much
hotter than the other? Make sure your timing is set correctly. Make
sure some broken impeller pieces aren't blocking the power steering
cooler. Are your exast shutters clacking noticeably?

As long as you have sufficient water pressure to the muffs and you arent
running the engine more than a fast idle, there's nothing more to check
without pulling the drive off. Check the oil cooler to be sure there are
no blockages. you don't want them sandbagging you when you bring it in
for service. If they come back and say the problem is something you
already checked then you have a problem with your assessment or the
dealership's honesty.
Good luck.

I've never took off/checked the cooler before... can i just pull the hoses
off each side? take the entire cooler down/off? what's the norm? and how
to flush/check it? Thanks again for all your help!


"jim 0010" wrote in message
...
Matt wrote:
I called the marina that did my drive service (they said it prob isn't
that because both would be overheating) i have never had a prob w/ them
in the past, but i expect them to say that over the phone becuase there
can be 10 other things wrong w/ it too.. There is no mussles or anything
growing (it's dry docked all year long and in fresh water) manifolds are
running about the same the one where the riser is very hot is a little
warmer but i guess that would be as a result of right?

The flaps sound fine, i hear no clacking...

I can check the cooler, but again, at the end of last season all was
fine, winterized it, then had it serviced few weeks ago, then the start
of my problems...

I pulled the hoses to the risers while the engine was on to check the
flow, the 'hot' riser had a little less flow but nothing major, this was
all while on the earmuffs...

I'm clueless... I am dreading bringing it back to the marina the TELLING
them to redo the impeller or recheck it.. I really don't want to do it
myself, it's such a pain in the ass and i need two people for it...


"jim 0010" wrote in message
...
Matt wrote:
It was stored with coolant run through (same as i do every year) There
are no metering balls in the housing, and i toolk the entire housing
apart, everything looks good. Hose's are definately not reversed.
Manifolds/Risers are only 3 years old, fresh water use only. I
inspected the riser and looks good.


"jim 0010" wrote in message
...
Matt wrote:
Hi,

I have a 94' Chaparral w/a 5.7L Mercruiser 350MAG. Looking for some
advice on pinpointing a problem. Here's the story:

Last year everything was running fine. Beginning of this season i
had the outdrive/impeller serviced. After dropping it in the water i
noticed that one Riser gets extremely hot. This is def not the norm.
The temp is constant at 160 (thermostat setting). I took off the
entire thermostat housing (everything was fine), replaced the
thermostat, took off the Riser (everything fine), checked the exhaust
flaps (everything fine), and all hoses looked good. I can't figure
out what could be the problem. My two thoughts, either something
happened over the course of the winter, but what? or when the marina
serviced the outdrive something got screwed up. but if it was an
water intake problem wouldn't both risers get really hot?

Any help troubleshooting is greatly appreciated.

Thanks!!



The first thing to be suspicious of is the work that was just done.
Did you store the engine wet or dry? Dry storage can cause excessive
internal rusting. Rust particles could be clogging a riser or the
riser itself has rusted out and clogged. If your engine has metering
balls in the thermostat housing, they could be worn or where they seat
on the housing could be eroded. Is it possible that you have 2 hoses
reversed.

I would go to the water pump and check it carefully, including the part
the copper tube sticks out, of in the upper unit. It might have melted
during an overheat episode. Also make sure the guy used the right
rebuild kit. Make sure the 3/4 diam water hose in the bell housing isn't
kinked or cracked. Make sure you don't have mussels or vegatation
clogging the water pickup vents. Is one manifold much hotter than the
other? Make sure your timing is set correctly. Make sure some broken
impeller pieces aren't blocking the power steering cooler. Are your
exast shutters clacking noticeably?

As long as you have sufficient water pressure to the muffs and you arent
running the engine more than a fast idle, there's nothing more to check
without pulling the drive off. Check the oil cooler to be sure there are
no blockages. you don't want them sandbagging you when you bring it in for
service. If they come back and say the problem is something you already
checked then you have a problem with your assessment or the dealership's
honesty.
Good luck.

Matt wrote:
I've never took off/checked the cooler before... can i just pull the
hoses off each side? take the entire cooler down/off? what's the
norm? and how to flush/check it? Thanks again for all your help!


"jim 0010" wrote in message
...
Matt wrote:
I called the marina that did my drive service (they said it prob
isn't that because both would be overheating) i have never had a prob
w/ them in the past, but i expect them to say that over the phone
becuase there can be 10 other things wrong w/ it too.. There is no
mussles or anything growing (it's dry docked all year long and in
fresh water) manifolds are running about the same the one where the
riser is very hot is a little warmer but i guess that would be as a
result of right?

The flaps sound fine, i hear no clacking...

I can check the cooler, but again, at the end of last season all was
fine, winterized it, then had it serviced few weeks ago, then the
start of my problems...

I pulled the hoses to the risers while the engine was on to check the
flow, the 'hot' riser had a little less flow but nothing major, this
was all while on the earmuffs...

I'm clueless... I am dreading bringing it back to the marina the
TELLING them to redo the impeller or recheck it.. I really don't want
to do it myself, it's such a pain in the ass and i need two people
for it...


"jim 0010" wrote in message
...
Matt wrote:
It was stored with coolant run through (same as i do every year)
There are no metering balls in the housing, and i toolk the entire
housing apart, everything looks good. Hose's are definately not
reversed. Manifolds/Risers are only 3 years old, fresh water use
only. I inspected the riser and looks good.


"jim 0010" wrote in message
...
Matt wrote:
Hi,

I have a 94' Chaparral w/a 5.7L Mercruiser 350MAG. Looking for
some advice on pinpointing a problem. Here's the story:

Last year everything was running fine. Beginning of this season
i had the outdrive/impeller serviced. After dropping it in the
water i noticed that one Riser gets extremely hot. This is def
not the norm. The temp is constant at 160 (thermostat setting).
I took off the entire thermostat housing (everything was fine),
replaced the thermostat, took off the Riser (everything fine),
checked the exhaust flaps (everything fine), and all hoses looked
good. I can't figure out what could be the problem. My two
thoughts, either something happened over the course of the
winter, but what? or when the marina serviced the outdrive
something got screwed up. but if it was an water intake problem
wouldn't both risers get really hot?

Any help troubleshooting is greatly appreciated.

Thanks!!



The first thing to be suspicious of is the work that was just
done. Did you store the engine wet or dry? Dry storage can cause
excessive internal rusting. Rust particles could be clogging a
riser or the riser itself has rusted out and clogged. If your
engine has metering balls in the thermostat housing, they could be
worn or where they seat on the housing could be eroded. Is it
possible that you have 2 hoses reversed.

I would go to the water pump and check it carefully, including the
part the copper tube sticks out, of in the upper unit. It might have
melted during an overheat episode. Also make sure the guy used the
right rebuild kit. Make sure the 3/4 diam water hose in the bell
housing isn't kinked or cracked. Make sure you don't have mussels or
vegatation clogging the water pickup vents. Is one manifold much
hotter than the other? Make sure your timing is set correctly. Make
sure some broken impeller pieces aren't blocking the power steering
cooler. Are your exast shutters clacking noticeably?

As long as you have sufficient water pressure to the muffs and you
arent running the engine more than a fast idle, there's nothing more
to check without pulling the drive off. Check the oil cooler to be
sure there are no blockages. you don't want them sandbagging you when
you bring it in for service. If they come back and say the problem is
something you already checked then you have a problem with your
assessment or the dealership's honesty.
Good luck.

pull both hoses off and run a wooden bbq skewer thru each tube. Catch
anything that comes out the other side and inspect it to see what it is.
Or you could look thru the tubes if you can.

Ok, can't look throught them too low and tight of a space.. I'll go buy some
skewers!!

Thanks again.. crossin' my fingers..


"jim 0010" wrote in message
...
Matt wrote:
I've never took off/checked the cooler before... can i just pull the
hoses off each side? take the entire cooler down/off? what's the norm?
and how to flush/check it? Thanks again for all your help!


"jim 0010" wrote in message
...
Matt wrote:
I called the marina that did my drive service (they said it prob isn't
that because both would be overheating) i have never had a prob w/ them
in the past, but i expect them to say that over the phone becuase there
can be 10 other things wrong w/ it too.. There is no mussles or
anything growing (it's dry docked all year long and in fresh water)
manifolds are running about the same the one where the riser is very
hot is a little warmer but i guess that would be as a result of right?

The flaps sound fine, i hear no clacking...

I can check the cooler, but again, at the end of last season all was
fine, winterized it, then had it serviced few weeks ago, then the start
of my problems...

I pulled the hoses to the risers while the engine was on to check the
flow, the 'hot' riser had a little less flow but nothing major, this
was all while on the earmuffs...

I'm clueless... I am dreading bringing it back to the marina the
TELLING them to redo the impeller or recheck it.. I really don't want
to do it myself, it's such a pain in the ass and i need two people for
it...


"jim 0010" wrote in message
...
Matt wrote:
It was stored with coolant run through (same as i do every year)
There are no metering balls in the housing, and i toolk the entire
housing apart, everything looks good. Hose's are definately not
reversed. Manifolds/Risers are only 3 years old, fresh water use
only. I inspected the riser and looks good.


"jim 0010" wrote in message
...
Matt wrote:
Hi,

I have a 94' Chaparral w/a 5.7L Mercruiser 350MAG. Looking for
some advice on pinpointing a problem. Here's the story:

Last year everything was running fine. Beginning of this season i
had the outdrive/impeller serviced. After dropping it in the water
i noticed that one Riser gets extremely hot. This is def not the
norm. The temp is constant at 160 (thermostat setting). I took off
the entire thermostat housing (everything was fine), replaced the
thermostat, took off the Riser (everything fine), checked the
exhaust flaps (everything fine), and all hoses looked good. I
can't figure out what could be the problem. My two thoughts,
either something happened over the course of the winter, but what?
or when the marina serviced the outdrive something got screwed up.
but if it was an water intake problem wouldn't both risers get
really hot?

Any help troubleshooting is greatly appreciated.

Thanks!!



The first thing to be suspicious of is the work that was just done.
Did you store the engine wet or dry? Dry storage can cause excessive
internal rusting. Rust particles could be clogging a riser or the
riser itself has rusted out and clogged. If your engine has metering
balls in the thermostat housing, they could be worn or where they
seat on the housing could be eroded. Is it possible that you have 2
hoses reversed.

I would go to the water pump and check it carefully, including the
part the copper tube sticks out, of in the upper unit. It might have
melted during an overheat episode. Also make sure the guy used the
right rebuild kit. Make sure the 3/4 diam water hose in the bell
housing isn't kinked or cracked. Make sure you don't have mussels or
vegatation clogging the water pickup vents. Is one manifold much
hotter than the other? Make sure your timing is set correctly. Make
sure some broken impeller pieces aren't blocking the power steering
cooler. Are your exast shutters clacking noticeably?

As long as you have sufficient water pressure to the muffs and you arent
running the engine more than a fast idle, there's nothing more to check
without pulling the drive off. Check the oil cooler to be sure there are
no blockages. you don't want them sandbagging you when you bring it in
for service. If they come back and say the problem is something you
already checked then you have a problem with your assessment or the
dealership's honesty.
Good luck.

pull both hoses off and run a wooden bbq skewer thru each tube. Catch
anything that comes out the other side and inspect it to see what it is.
Or you could look thru the tubes if you can.