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Troubleshooting steam in exhaust
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! |
Troubleshooting steam in exhaust
"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? |
Troubleshooting steam in exhaust
yea there was water coming out the back a very-little through the prop
(which is normal when on hose) and was coming from the exhuast too "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? |
Troubleshooting steam in exhaust
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? |
Troubleshooting steam in exhaust
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? |
Troubleshooting steam in exhaust
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.... Another consideration is the possiblity that the previous impeller fragmented and a piece of it has worked its way into a point in the cooling system and is restricting the flow of water, which could cause the steam you see. Make sure the flush hose has enough water to feed the outdrive intake when flushing. It takes a surprising amount of water to feed the pump. Keep the rpm down. |
Troubleshooting steam in exhaust
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 ink.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? |
Troubleshooting steam in exhaust
Sounds normal to me. The exhaust will get hot you know.
"oelf92" wrote in message ... 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 ink.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? |
Troubleshooting steam in exhaust
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 link.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? -- ****************************************** ***** Have a Spectacular Day! ***** ****************************************** John |
Troubleshooting steam in exhaust
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 hlink.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? -- ****************************************** ***** Have a Spectacular Day! ***** ****************************************** John |
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