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Smoke
seaduck	#1  Posted on 04/09/05 - 9:03 PM
Member Posts: 37 Comments: 0 Joined: 04/02/05	Hey guys, last year I replaced one of my (two) exhaust "y's".(inboard) The original? was a fiberglassish looking thing and the one I had built to replace it was brass. shortly after I noticed white smoke (steam?) from that engine. Is this the cause of the new exhaust system, or could it be a internal problem? Thank you in advance. Edited by seaduck on 04/09/05 - 10:13 PM
seaduck	#2  Posted on 04/09/05 - 9:05 PM
Member Posts: 37 Comments: 0 Joined: 04/02/05	I forgot to mention The engine is a mercruiser inboard 230 (chevy 305)
Jeff	#3  Posted on 04/11/05 - 7:42 AM
Member Posts: 1987 Comments: 34 Joined: 04/02/05	1st where is the smoke/steam coming from? 2nd what color is it? white or dark brown / black? 3rd does it have an oder to it? If so does it smell like buring oil?
seaduck	#4  Posted on 04/11/05 - 9:56 AM
Member Posts: 37 Comments: 0 Joined: 04/02/05	Thanks for the reply Jeff, 1-its coming from the exhaust 2-white 3- I dont notice any odor I only see it when underway, idling at the dock there is no smoke at all coming from the exhaust. Thanks again
frostbite	#5  Posted on 04/11/05 - 12:12 PM
Member Posts: 2 Comments: 0 Joined: 04/03/05	Seaduck, I guess you have a water cooled exhaust. Is it possible one side is not getting enough water cooling?
Jeff	#6  Posted on 04/11/05 - 12:42 PM
Member Posts: 1987 Comments: 34 Joined: 04/02/05	hhhmmmm, Well maybe the brass is just getting to hot and water is contacting it somewhere creating the steam. Fiberglass and composites are insulators where metals transmit heat. Did you check to make sure all of your exhaust hoses and clamped down good and tight. There could be steamy exhaust escaping from a fitting. Do you have any pictures? That would help..... Do not suppose you have any why to measure exhaust gas temps (EGTs)? That could tell you if one side of the engine is not getting enough water to cool. Edited by Jeff on 04/11/05 - 12:44 PM
liteamorn	#7  Posted on 04/11/05 - 12:49 PM
Member Posts: 16 Comments: 0 Joined: 03/30/05	Could it be a leaky head gasket on the engine? In the old days a car that emited white smoke(steam) usually needed a new head gasket or (heaven forbid) a new head. Ed
seaduck	#8  Posted on 04/11/05 - 8:08 PM
Member Posts: 37 Comments: 0 Joined: 04/02/05	Thanks fella's for the replies. Frostbite, I have not checked the raw water pump yet this year (thanks you reminded me to get on it) Jeff, I was kinda thinking (hoping the same thing) No, no exhaust temp gauge. As for pics, I cant seem to post them but the mods are helping me figure it out. Liteamorn, I dunno but it's food for thought Well now I'm going to try to figure out an electrical isuue that popped up today (always something)
Jeff	#9  Posted on 04/12/05 - 5:55 AM
Member Posts: 1987 Comments: 34 Joined: 04/02/05	if your head gasket is gone check your oil...if it is shot your oil will be milky..
seaduck	#10  Posted on 04/12/05 - 8:01 PM
Member Posts: 37 Comments: 0 Joined: 04/02/05	Thanks Jeff, I changed the oil this past weekend and it looked a ok.
Teak Oil	#11  Posted on 04/13/05 - 8:05 AM
Member Posts: 23 Comments: 0 Joined: 04/11/05	It is possible for a head gasket to go and not have milky oil, or only be leaking enough to have all the water burn up in the combustion chamber. I would do a compression and leak down test, along with reading the spark plugs just to be sure
seaduck	#12  Posted on 04/25/05 - 9:11 PM
Member Posts: 37 Comments: 0 Joined: 04/02/05	TEAK OIl, What is a leak down test? Thanks
Teak Oil	#13  Posted on 04/26/05 - 1:49 PM
Member Posts: 23 Comments: 0 Joined: 04/11/05	A leak down test not only measures compression, but it also measures how fast the compression "leaks out" of the cylinder past the rings. It is an excellent indicator of how tired your engine is
seaduck	#14  Posted on 04/30/05 - 7:43 PM
Member Posts: 37 Comments: 0 Joined: 04/02/05	Thanks Teak for clearing that up.