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Steam coming out of exhaust |
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todicus 
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Joined: July-10-2006 Location: Napa, Ca Status: Offline Points: 493 |
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 Topic: Steam coming out of exhaustPosted: October-04-2006 at 12:23pm |
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I noticed last time I had my boat out, some steam was coming out of the exhaust...... not a whole lot, but noticable. It was a warm day with warm water temps, boat ran fine at a constant 160 degrees.
I read some old posts about potential problems, but was hoping this is just a normal thing for the EFI GT-40 with 200 hrs on it. |
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Tim D
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Posted: October-04-2006 at 12:56pm |
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On cooler days, you'll notice some steam when the thermostat opens. If the humidity is just right, it may be more noticeable.
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Tim D
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JoeinNY
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Posted: October-04-2006 at 1:09pm |
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Yep, A few occasional puffs probably not an issue, one particular side spewing out steady steam then your probably looking at a cracked manifold or something of the like...
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todicus
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Posted: October-04-2006 at 2:44pm |
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Cracked intake or exhaust manifold ?
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todicus
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Posted: October-04-2006 at 2:59pm |
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Duh..... exhaust......... where do they usually crack ?
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Tim D
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Posted: October-04-2006 at 3:22pm |
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Water travels through the walls of the exhaust. Look at the gasket below. The thin slots on each side is where water travels. The large opening in the middle is where the exhaust is. All it takes is a crack in the wall for water to enter.
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Tim D
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todicus
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Posted: October-04-2006 at 4:01pm |
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Thanks Tim. Could it be a cracked gasket ? Do they sell them at SkiDim ?
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TRBenj
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Posted: October-04-2006 at 5:11pm |
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A cracked riser gasket could let water back into the head, so if you have any signs of it leaking, replace it! Im positive SkiDIM sells them.
Steam coming out of the exhaust can be perfectly normal though- we get it all the time on all of our boats, especially in the morning. |
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Tim D
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Posted: October-04-2006 at 5:20pm |
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I took that pic from skidims site. Like trbenj said, if it's cool enough, you'll have steam constant, from the water heating up from cooling off the exhaust manifolds. If you have a crack and it's leaking into the motor, a sign would be hard to start after short shut down.
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Tim D
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M3Fan
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Posted: October-04-2006 at 5:38pm |
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The early 90's boats are steam machines. Not unusual. If you had a leaking riser gasket, you'd be in some serious trouble pretty quick I'd imagine.
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Jim_In_Houston
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Posted: October-04-2006 at 11:54pm |
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I am happy when steam comes out of mine. It tells me my thermostat is open.
So, where do you get the gaskets for Ford / Interceptor exhaust manifolds? They look like the one in TimD's pic but the SkiDIM site says those are for Ford and GM Indmar whatever that is. |
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Happy owner of a '66 and a '68 Mustang
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JoeinNY
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Posted: October-05-2006 at 12:12am |
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I never found them Jim had to make some with the exacto knife.. hope you do better
Joe. |
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Jim_In_Houston
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Posted: October-05-2006 at 1:04am |
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I had to make my last set too. Exacto knife was the tool of choice - and a set of hole punches. Did you notice how the openings on the machined fits on the exhaust manifolds are not exact? I actually had to make each gasket special for each fit. What a pain. Know what I mean?
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Happy owner of a '66 and a '68 Mustang
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bkhallpass
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Posted: October-05-2006 at 1:19am |
Not sure if you were being facetious, but I'll bite. Indmar is just another inboard engine manufacturer like PCM. Has been the engine of choice for Mastercraft for many years, and is the standard engine offered in Malibu. BKH |
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Livin' the Dream
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Jim_In_Houston
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Posted: October-05-2006 at 9:47am |
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Thanks BKH. I have seen the Indmar name around. I just didn't know what it was.
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Happy owner of a '66 and a '68 Mustang
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Barracuda
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Posted: October-05-2006 at 2:57pm |
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Had some steam the other night- was running the engine with the hood up and noticed the steam coming out from all around the exhaust manifolds-
Shut the hood and don't think about it. -Brad |
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Nautique2001
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Posted: October-05-2006 at 3:42pm |
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I thought the steam was normal to some extent? Mine will occasionally blow out a burst of steam, but clear up after a while. All my exhaust stuff is brand new. Would water, engine or air temp vary the steam? I'm not going to sweat it. I occasionally blow off steam after work and I feel fine.
Ken |
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Jim_In_Houston
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Posted: October-05-2006 at 7:29pm |
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I'm with Brad.
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Happy owner of a '66 and a '68 Mustang
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eric lavine
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Posted: October-06-2006 at 9:00pm |
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they use those gaskets many different engines, you can get them at napa, tell them you need there sierra catalog. even your local mercruiser dealer should have them on the shelf.
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"the things you own will start to own you"
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87BFN owner
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Joined: August-25-2006 Location: Saline, MI Status: Offline Points: 2194 |
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Posted: October-17-2006 at 5:25pm |
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steam on my boat is normal if it's less the 65 degrees out. I have had experience with excess steam on a MC before. The gasket had gone bad and it plug the water pa$$ages. Luckily we found problem right away. It was a friend of my parents boat. So we went to the hardware store bought gasket material and made a new one. Took maybe a half hour.
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87BFN owner
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Posted: October-17-2006 at 5:27pm |
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oh yeah make sure you are getting plenty of water with the steam though, if there is a lack of water then, you have a problem, sorry forgot to mention that.
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The Dude
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Posted: October-17-2006 at 6:52pm |
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steam is cool...like James Dean.
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Mullet Free since 93
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Jim_In_Houston wrote: