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"(Exhaust Relief Ports - E
"(Exhaust Relief Ports - Exhaust Housing (Inner/Outer)
(J Reeves)
The long housing between the powerhead and the lower unit is called the exhaust housing. There is a inner housing within it that has a heavy duty seal around the bottom of it, or heavy duty seals around a inner extension between the housing and the lower unit.
The red hot exhaust travels down thru that inner tube and out the propeller with a somewhat supply of water to cool the propeller hub. A good amount of water surrounds and fills the space between the outer and inner tube, otherwise the outer housing would get so hot that the paint would burn off.
Some water pumps, for some reason (differing even when new) exert a great amount of water pressure, and if the exhaust housing seals are in perfect condition, the water fills the tube to a point of overflowing.
This brings into play those two holes or slots, whichever the engine might have, at the top rear portion of the exhaust housing just below the powerhead.
Now, if those two holes/slots weren't there, water would continue to flow up into the cylinders. Water not flowing out of those holes is no concern for alarm UNLESS that outer housing suddenly becomes extremely hot..... the warning horn should sound long before that happens.
The main reason for those holes being there (exhaust relief holes) is that when at an idle, there is an extreme amount of resistance encountered by the exhaust trying to escape due the fact that the outlet via the propeller is now blocked by a wall of water. The escape route in this case is for the exhaust to escape out those two holes, otherwise the engine would slow down quite quickly and die. If exhaust cannot escape, air/fuel cannot gain entrance to the engine.
Thousands of parts in my remaining stock. Not able to list them all. Let me know what you need and I'll look it up for you. Visit my eBay store at:
http://stores.ebay.com/Evinrude-Johnson-Outboard-Parts-etc?refid=store"
How exactly the outer housing will get hot until the paint will burn off ? The housing is already inside the water, you have no clue what you are talking about."(Exhaust Relief Ports - E
"(Exhaust Relief Ports - Exhaust Housing (Inner/Outer)
(J Reeves)
The long housing between the powerhead and the lower unit is called the exhaust housing. There is a inner housing within it that has a heavy duty seal around the bottom of it, or heavy duty seals around a inner extension between the housing and the lower unit.
The red hot exhaust travels down thru that inner tube and out the propeller with a somewhat supply of water to cool the propeller hub. A good amount of water surrounds and fills the space between the outer and inner tube, otherwise the outer housing would get so hot that the paint would burn off.
Some water pumps, for some reason (differing even when new) exert a great amount of water pressure, and if the exhaust housing seals are in perfect condition, the water fills the tube to a point of overflowing.
This brings into play those two holes or slots, whichever the engine might have, at the top rear portion of the exhaust housing just below the powerhead.
Now, if those two holes/slots weren't there, water would continue to flow up into the cylinders. Water not flowing out of those holes is no concern for alarm UNLESS that outer housing suddenly becomes extremely hot..... the warning horn should sound long before that happens.
The main reason for those holes being there (exhaust relief holes) is that when at an idle, there is an extreme amount of resistance encountered by the exhaust trying to escape due the fact that the outlet via the propeller is now blocked by a wall of water. The escape route in this case is for the exhaust to escape out those two holes, otherwise the engine would slow down quite quickly and die. If exhaust cannot escape, air/fuel cannot gain entrance to the engine.
Thousands of parts in my remaining stock. Not able to list them all. Let me know what you need and I'll look it up for you. Visit my eBay store at:
http://stores.ebay.com/Evinrude-Johnson-Outboard-Parts-etc?refid=store"
That's alright little man... someday daddy might teach you how to read. My writeup is self explanatory. Here, let me explain it to you...... one short paragraph states "The red hot exhaust travels down thru that inner tube and out the propeller with a somewhat supply of water to cool the propeller hub. A good amount of water surrounds and fills the space between the outer and inner tube, otherwise the outer housing would get so hot that the paint would burn off."... The word "otherwise" indicates "If No Water Existed". Everybody else understands that BUT you Dumbass!How exactly the outer housing will get hot until the paint will burn off ? The housing is already inside the water, you have no clue what you are talking about.
Yes Really racer! Years ago when you first came on Marine Engines site, you were loaded with sarcastic, snide, insulting remarks, casting such wording around to other members helpful replies as "Pure Rubbish" just to state one. I see that you haven changed. You just can't help yourself can you? For the record, I took a strong dislike towards you then when I was quite active... and now at the age of 91, due to your arrogant superiority attitude complex that's apparently embedded within your boney head... you can consider yourself a first class ass in my book!Really ??
I don't think racer was talking you Joe.Yes Really racer! Years ago when you first came on Marine Engines site, you were loaded with sarcastic, snide, insulting remarks, casting such wording around to other members helpful replies as "Pure Rubbish" just to state one. I see that you haven changed. You just can't help yourself can you? For the record, I took a strong dislike towards you then when I was quite active... and now at the age of 91, due to your arrogant superiority attitude complex that's apparently embedded within your boney head... you can consider yourself a first class ass in my book!