Troubleshooting steam in exhaust
 

On Sun, 30 Jul 2006 07:51:20 -0400, "oelf92"
wrote:

Yes, I replaced both risers and manifolds at the end of last year... that's
why i can't think it would be the riser/manifold, it can't corrode that fast
(in fresh water)... I was going to change the impeller today but your saying
if it was the impeller then both would get warm/hot?

It's only the one riser that gets hot, the other stays cool if not cold...


"JohnH" wrote in message
.. .
On Sat, 29 Jul 2006 19:06:01 -0400, "oelf92"
wrote:

Well i just got back from the lake... Result was it was steaming very very
little, BUT the one ehaust elbow was warm which never happened before and
the ehaust tube (where the flaps are) was really hot, never noticed if
that
is normal or not..... and the elbow never even got warm in the past always
was cool to the touch.. So i plan on changing the impeller tomorrow...
hopefully that will help...

also the temp gauge never moved was on the cool side... but again, when i
ran it a little hard in the lake the one elbow heated up a little..
anything
can be blocking the elbow???

-m



"Jim" wrote in message
thlink.net...
Not always, sometimes it comes un-glued and slips, sometimes the blades
curl, sometimes it breaks up just a little. In these cases it might pump
but not enough.

You could have a water pressure problem at your sillcock. Running it in
the lake will let you know if that was the case. Some of these guys have
a
pressure equalizing ball assembly that makes sure each riser and or
manifold gets the same water flow.

When you get an overheat like this, the adapter in the upper gearcase
that
holds the copper waterpump tube likes to melt down. You need to check
this
when you are serviceing the water pump.

"oelf92" wrote in message
...
Also when the impeller goes does it go completely??? I plan on
dropping
it in the lake today to test it.... any suggestions???


"Jim" wrote in message
ink.net...

"oelf92" wrote in message
...
I have a 94' Mercruise 5.7L V8... I haven't run it in about 3 weeks
and
when i started it up today on the hose with the muffs, there was steam
coming from the exhaust. (This has never happened before on the hose)
Also the one exhuast elbow was getting warm... I replaced both
manifold
and elbows last year, both exhuast flaps, and the impeller was done
about 1 year ago.... Can anyone recommend a trouble shooting list....

Thanks!




Sounds like the impeller is shot. Was there any water coming out the
back?







You say the exhaust elbow was warm. What did the riser feel like? Both
risers should be about the same temp. On my boat I can put my hand on the
riser for a few seconds before it becomes unbearable. When the riser was
plugged, which sounds like your problem, it was very hot to the touch. If
the impeller is the problem, both risers would be hot.

When you say 'elbow', are you referring to the riser? If so, and one is
much hotter than the other, then you've got a problem with water not
getting to *that* riser. I'd be taking off the riser and manifold. Have
you
ever replaced them?

If one side stays cool, then it must be getting water. I'd start narrowing
my focus to the side that's getting hot.
--
******************************************
***** Have a Spectacular Day! *****
******************************************

John

Troubleshooting steam in exhaust
 

John... I took of the riser and everything looked clean... i also took off
the hoses from the thermostat to both risers and the water was pouring
equally... The one riser that gets hot seems like it's heating from the
back to front, meaning it's hotter in the back and warm in toward the fron
tof the riser... I checked the exhaust flaps and they were fine... I'm
baffled...


"JohnH" wrote in message
...
On Sun, 30 Jul 2006 07:51:20 -0400, "oelf92"
wrote:

Yes, I replaced both risers and manifolds at the end of last year...
that's
why i can't think it would be the riser/manifold, it can't corrode that
fast
(in fresh water)... I was going to change the impeller today but your
saying
if it was the impeller then both would get warm/hot?

It's only the one riser that gets hot, the other stays cool if not cold...


"JohnH" wrote in message
. ..
On Sat, 29 Jul 2006 19:06:01 -0400, "oelf92"
wrote:

Well i just got back from the lake... Result was it was steaming very
very
little, BUT the one ehaust elbow was warm which never happened before
and
the ehaust tube (where the flaps are) was really hot, never noticed if
that
is normal or not..... and the elbow never even got warm in the past
always
was cool to the touch.. So i plan on changing the impeller tomorrow...
hopefully that will help...

also the temp gauge never moved was on the cool side... but again, when
i
ran it a little hard in the lake the one elbow heated up a little..
anything
can be blocking the elbow???

-m



"Jim" wrote in message
rthlink.net...
Not always, sometimes it comes un-glued and slips, sometimes the
blades
curl, sometimes it breaks up just a little. In these cases it might
pump
but not enough.

You could have a water pressure problem at your sillcock. Running it
in
the lake will let you know if that was the case. Some of these guys
have
a
pressure equalizing ball assembly that makes sure each riser and or
manifold gets the same water flow.

When you get an overheat like this, the adapter in the upper gearcase
that
holds the copper waterpump tube likes to melt down. You need to check
this
when you are serviceing the water pump.

"oelf92" wrote in message
...
Also when the impeller goes does it go completely??? I plan on
dropping
it in the lake today to test it.... any suggestions???


"Jim" wrote in message
ink.net...

"oelf92" wrote in message
...
I have a 94' Mercruise 5.7L V8... I haven't run it in about 3 weeks
and
when i started it up today on the hose with the muffs, there was
steam
coming from the exhaust. (This has never happened before on the
hose)
Also the one exhuast elbow was getting warm... I replaced both
manifold
and elbows last year, both exhuast flaps, and the impeller was done
about 1 year ago.... Can anyone recommend a trouble shooting
list....

Thanks!




Sounds like the impeller is shot. Was there any water coming out the
back?







You say the exhaust elbow was warm. What did the riser feel like? Both
risers should be about the same temp. On my boat I can put my hand on
the
riser for a few seconds before it becomes unbearable. When the riser was
plugged, which sounds like your problem, it was very hot to the touch.
If
the impeller is the problem, both risers would be hot.

When you say 'elbow', are you referring to the riser? If so, and one is
much hotter than the other, then you've got a problem with water not
getting to *that* riser. I'd be taking off the riser and manifold. Have
you
ever replaced them?

If one side stays cool, then it must be getting water. I'd start narrowing
my focus to the side that's getting hot.
--
******************************************
***** Have a Spectacular Day! *****
******************************************

John

Troubleshooting steam in exhaust
 

Well, now I'm just as baffled.

Hopefully some of the smarter folks will have some more ideas. Sorry I
couldn't come up with anything worthwhile.

John

On Sun, 30 Jul 2006 11:34:40 -0400, "oelf92"
wrote:

John... I took of the riser and everything looked clean... i also took off
the hoses from the thermostat to both risers and the water was pouring
equally... The one riser that gets hot seems like it's heating from the
back to front, meaning it's hotter in the back and warm in toward the fron
tof the riser... I checked the exhaust flaps and they were fine... I'm
baffled...


"JohnH" wrote in message
.. .
On Sun, 30 Jul 2006 07:51:20 -0400, "oelf92"
wrote:

Yes, I replaced both risers and manifolds at the end of last year...
that's
why i can't think it would be the riser/manifold, it can't corrode that
fast
(in fresh water)... I was going to change the impeller today but your
saying
if it was the impeller then both would get warm/hot?

It's only the one riser that gets hot, the other stays cool if not cold...


"JohnH" wrote in message
...
On Sat, 29 Jul 2006 19:06:01 -0400, "oelf92"
wrote:

Well i just got back from the lake... Result was it was steaming very
very
little, BUT the one ehaust elbow was warm which never happened before
and
the ehaust tube (where the flaps are) was really hot, never noticed if
that
is normal or not..... and the elbow never even got warm in the past
always
was cool to the touch.. So i plan on changing the impeller tomorrow...
hopefully that will help...

also the temp gauge never moved was on the cool side... but again, when
i
ran it a little hard in the lake the one elbow heated up a little..
anything
can be blocking the elbow???

-m



"Jim" wrote in message
arthlink.net...
Not always, sometimes it comes un-glued and slips, sometimes the
blades
curl, sometimes it breaks up just a little. In these cases it might
pump
but not enough.

You could have a water pressure problem at your sillcock. Running it
in
the lake will let you know if that was the case. Some of these guys
have
a
pressure equalizing ball assembly that makes sure each riser and or
manifold gets the same water flow.

When you get an overheat like this, the adapter in the upper gearcase
that
holds the copper waterpump tube likes to melt down. You need to check
this
when you are serviceing the water pump.

"oelf92" wrote in message
...
Also when the impeller goes does it go completely??? I plan on
dropping
it in the lake today to test it.... any suggestions???


"Jim" wrote in message
ink.net...

"oelf92" wrote in message
...
I have a 94' Mercruise 5.7L V8... I haven't run it in about 3 weeks
and
when i started it up today on the hose with the muffs, there was
steam
coming from the exhaust. (This has never happened before on the
hose)
Also the one exhuast elbow was getting warm... I replaced both
manifold
and elbows last year, both exhuast flaps, and the impeller was done
about 1 year ago.... Can anyone recommend a trouble shooting
list....

Thanks!




Sounds like the impeller is shot. Was there any water coming out the
back?







You say the exhaust elbow was warm. What did the riser feel like? Both
risers should be about the same temp. On my boat I can put my hand on
the
riser for a few seconds before it becomes unbearable. When the riser was
plugged, which sounds like your problem, it was very hot to the touch.
If
the impeller is the problem, both risers would be hot.

When you say 'elbow', are you referring to the riser? If so, and one is
much hotter than the other, then you've got a problem with water not
getting to *that* riser. I'd be taking off the riser and manifold. Have
you
ever replaced them?

If one side stays cool, then it must be getting water. I'd start narrowing
my focus to the side that's getting hot.
--
******************************************
***** Have a Spectacular Day! *****
******************************************

John


--
******************************************
***** Have a Spectacular Day! *****
******************************************

John

Troubleshooting steam in exhaust
 

There was a problem with the cast iron thermostat housings beginning in
1987. The ball seat on one side would rot out and the water to the risers
would be unbalanced. Take the hoses to the risers off at the thermostat
housing ends and inspect the balls and seats carefully for wear or rot. You
could have some scale blocking a riser, kinked water hose, junk blocking the
power steering cooler, water pump problem, blockage in the water pickup
area. pieces of old water pump impeller obstructing water flow.
Low flow can show up as a problem with one side. Don't ask me why.
If you can't find anything wrong, change the water pump and go from there.

"oelf92" wrote in message
...
John... I took of the riser and everything looked clean... i also took off
the hoses from the thermostat to both risers and the water was pouring
equally... The one riser that gets hot seems like it's heating from the
back to front, meaning it's hotter in the back and warm in toward the fron
tof the riser... I checked the exhaust flaps and they were fine... I'm
baffled...


"JohnH" wrote in message
...
On Sun, 30 Jul 2006 07:51:20 -0400, "oelf92"
wrote:

Yes, I replaced both risers and manifolds at the end of last year...
that's
why i can't think it would be the riser/manifold, it can't corrode that
fast
(in fresh water)... I was going to change the impeller today but your
saying
if it was the impeller then both would get warm/hot?

It's only the one riser that gets hot, the other stays cool if not
cold...


"JohnH" wrote in message
...
On Sat, 29 Jul 2006 19:06:01 -0400, "oelf92"
wrote:

Well i just got back from the lake... Result was it was steaming very
very
little, BUT the one ehaust elbow was warm which never happened before
and
the ehaust tube (where the flaps are) was really hot, never noticed if
that
is normal or not..... and the elbow never even got warm in the past
always
was cool to the touch.. So i plan on changing the impeller
tomorrow...
hopefully that will help...

also the temp gauge never moved was on the cool side... but again, when
i
ran it a little hard in the lake the one elbow heated up a little..
anything
can be blocking the elbow???

-m



"Jim" wrote in message
arthlink.net...
Not always, sometimes it comes un-glued and slips, sometimes the
blades
curl, sometimes it breaks up just a little. In these cases it might
pump
but not enough.

You could have a water pressure problem at your sillcock. Running it
in
the lake will let you know if that was the case. Some of these guys
have
a
pressure equalizing ball assembly that makes sure each riser and or
manifold gets the same water flow.

When you get an overheat like this, the adapter in the upper gearcase
that
holds the copper waterpump tube likes to melt down. You need to check
this
when you are serviceing the water pump.

"oelf92" wrote in message
...
Also when the impeller goes does it go completely??? I plan on
dropping
it in the lake today to test it.... any suggestions???


"Jim" wrote in message
ink.net...

"oelf92" wrote in message
...
I have a 94' Mercruise 5.7L V8... I haven't run it in about 3 weeks
and
when i started it up today on the hose with the muffs, there was
steam
coming from the exhaust. (This has never happened before on the
hose)
Also the one exhuast elbow was getting warm... I replaced both
manifold
and elbows last year, both exhuast flaps, and the impeller was done
about 1 year ago.... Can anyone recommend a trouble shooting
list....

Thanks!




Sounds like the impeller is shot. Was there any water coming out
the
back?







You say the exhaust elbow was warm. What did the riser feel like? Both
risers should be about the same temp. On my boat I can put my hand on
the
riser for a few seconds before it becomes unbearable. When the riser
was
plugged, which sounds like your problem, it was very hot to the touch.
If
the impeller is the problem, both risers would be hot.

When you say 'elbow', are you referring to the riser? If so, and one is
much hotter than the other, then you've got a problem with water not
getting to *that* riser. I'd be taking off the riser and manifold. Have
you
ever replaced them?

If one side stays cool, then it must be getting water. I'd start
narrowing
my focus to the side that's getting hot.
--
******************************************
***** Have a Spectacular Day! *****
******************************************

John

Troubleshooting steam in exhaust
 

well checked out the impeller today and it was in perfect condition... dunno
what to do... i think i might take the entire riser off and look at that...

another thing i don't remember is if the manifolds get EXTREMELY hot.. i
can't touch them for more than 3-4 seconds...


"oelf92" wrote in message
...
I have a 94' Mercruise 5.7L V8... I haven't run it in about 3 weeks and
when i started it up today on the hose with the muffs, there was steam
coming from the exhaust. (This has never happened before on the hose) Also
the one exhuast elbow was getting warm... I replaced both manifold and
elbows last year, both exhuast flaps, and the impeller was done about 1
year ago.... Can anyone recommend a trouble shooting list....

Thanks!