Exhaust refit I have a 30' hunter and the exhaust muffler is lying unlevel to the water line. It lies on a 30 deg angle down towards the stern. The unit is a large blue cylinder with a hose connectio at each end. It seem as if there is a perfect spot for the muffler to lay down in if the hose from the mixing elbow to the muffler were maybe a foot longer. Does anyone know where to get a replacement muffler, a company name, or flushing instructions? At high rpms my engine steams a bit out the exhaust. I'm thinking it might be improper mixing or a shortage of raw water due to the 30 deg angle of the muffler.
Exhaust
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One thought.
Whenever I have a problem like this I call Torresen Marine. I can only tell you that my old 2QM20's muffler lies flat. The hose from the elbow to there is angled down. The hose from the exit to the outlet has a loop higher than the waterline. And I have never had a problem but always expect that I will soon.
Whenever I have a problem like this I call Torresen Marine. I can only tell you that my old 2QM20's muffler lies flat. The hose from the elbow to there is angled down. The hose from the exit to the outlet has a loop higher than the waterline. And I have never had a problem but always expect that I will soon.
Amen Ed
Ilive about 2 blocks from Torresen and Brian is good friend. They are fantastic at all things sailing. I consider my self spoiled. Just waved hello to Brian on my way in from the boat. Pray for Wind, Lugeman
Ilive about 2 blocks from Torresen and Brian is good friend. They are fantastic at all things sailing. I consider my self spoiled. Just waved hello to Brian on my way in from the boat. Pray for Wind, Lugeman
easy job
the job is realtively simple. the muffler is available from almost any serious marine parts supplier (i.e not at westmarine). likewise for the specialty hoses. i recall that all the parts were well under $300, and the labor, while time consuming, is not rocket science, and it is definitley within the realm of an average DIY project.
the job is realtively simple. the muffler is available from almost any serious marine parts supplier (i.e not at westmarine). likewise for the specialty hoses. i recall that all the parts were well under $300, and the labor, while time consuming, is not rocket science, and it is definitley within the realm of an average DIY project.
Steam is OK
Steam from the exhaust at high RPM's can be normal. I have had several sailboats and drove a Coast Guard 41 footer for 6 years. A few of the sailboats steamed and the 41 steamed all of the time. The conversion from water to steam absorbs a lot of heat. As long as you have some water coming out of the exhaust with the steam the temperature cannot rise above 212 F(as this is the only temp that water and steam can coexist at atmospheric pressure. Bottom line-- don't worry about it or spend any $$ on it as long as theres water with the steam!!
Steam from the exhaust at high RPM's can be normal. I have had several sailboats and drove a Coast Guard 41 footer for 6 years. A few of the sailboats steamed and the 41 steamed all of the time. The conversion from water to steam absorbs a lot of heat. As long as you have some water coming out of the exhaust with the steam the temperature cannot rise above 212 F(as this is the only temp that water and steam can coexist at atmospheric pressure. Bottom line-- don't worry about it or spend any $$ on it as long as theres water with the steam!!
Steam is NOT okay!!! . . .
...assuming that you have a water cooled Yanmar, like I do in my H30, but a sea water cooled engine should be the same. A good Yanmar mechanic taught me that the mixing elbow should ALWAYS be cool enough to touch when the engine is running, even after several hours (I just did an all day trip, ten hours, and could still touch mine). If it is cool enough to touch, it certainly is not discharging any water hot enough to steam. If your exhaust hole is at the water line, touching the mixing elbow is a better way to check proper water flow than looking over the side to check water discharge. At idle, you can see the discharge, but if you are cruising, it is hard to tell (if the discharge is well above the waterline, it should be very easy to see). Most small diesels run at around 170 degrees. Steam is a sure sign that the engine is running too hat and not enough water is flowing through the heat exchanger (or block, if sea water cooled). You either have a clogged intake line, failed impeller, or severely clogged mixing elbow. The angle of the muffler shouldn't make any difference. Sea water is pumped through the muffler by the raw water impeller, which also creates the suction for intake. The raw water intake is on or near the center line (you should have to open the cock each time you sail---if you don't close it after every use, you are risking your boat) just aft of the engine. Water is not coming in through the muffler. Here in the Northwest, especially in the San Juan Islands, eel grass is a real problem. My raw water strainer contains at least some, and is often near full, every time I start my engine---which is why I ALWAYS check the strainer before starting the engine, and check the mixing elbow every hour or so during long motoring spells (learned this the hard way, after overheating). While cruising, always look for "steaming" sailboats--(usually charter folks/fools or beginners) who haven't learned of this local nuance. You will damage the engine if the problem is not addressed soon.
...assuming that you have a water cooled Yanmar, like I do in my H30, but a sea water cooled engine should be the same. A good Yanmar mechanic taught me that the mixing elbow should ALWAYS be cool enough to touch when the engine is running, even after several hours (I just did an all day trip, ten hours, and could still touch mine). If it is cool enough to touch, it certainly is not discharging any water hot enough to steam. If your exhaust hole is at the water line, touching the mixing elbow is a better way to check proper water flow than looking over the side to check water discharge. At idle, you can see the discharge, but if you are cruising, it is hard to tell (if the discharge is well above the waterline, it should be very easy to see). Most small diesels run at around 170 degrees. Steam is a sure sign that the engine is running too hat and not enough water is flowing through the heat exchanger (or block, if sea water cooled). You either have a clogged intake line, failed impeller, or severely clogged mixing elbow. The angle of the muffler shouldn't make any difference. Sea water is pumped through the muffler by the raw water impeller, which also creates the suction for intake. The raw water intake is on or near the center line (you should have to open the cock each time you sail---if you don't close it after every use, you are risking your boat) just aft of the engine. Water is not coming in through the muffler. Here in the Northwest, especially in the San Juan Islands, eel grass is a real problem. My raw water strainer contains at least some, and is often near full, every time I start my engine---which is why I ALWAYS check the strainer before starting the engine, and check the mixing elbow every hour or so during long motoring spells (learned this the hard way, after overheating). While cruising, always look for "steaming" sailboats--(usually charter folks/fools or beginners) who haven't learned of this local nuance. You will damage the engine if the problem is not addressed soon.
Water Supply Elbow on Mixing Elbow
With regard to the "steam" problem, part of it has to do with the outside air situation and in the coler months there can be vapors coming off but this time of year, well, depending on the situation like really high RPMs I'd be looking into what's causing it. As a suggestion, disconnect the hose that goes to the mixing elbow and remove the bronze ell that it was attached to. Look inside both the ell that you removed and the mixing elbow and clean out any black "stuff". My bet, since you're posting this is the mixing elbow has never been off. Is this right? Anyway, clean out what I mentioned and see if the water flow is more than before. If there was junk in there it probably will be. If this "fixes" the water flow and steam problem then my next suggestion is to take it apart again, including the mixing elbow, and clean or replace it. As for the muffler that's another story. Hope this helps. Let us know what you find out.
With regard to the "steam" problem, part of it has to do with the outside air situation and in the coler months there can be vapors coming off but this time of year, well, depending on the situation like really high RPMs I'd be looking into what's causing it. As a suggestion, disconnect the hose that goes to the mixing elbow and remove the bronze ell that it was attached to. Look inside both the ell that you removed and the mixing elbow and clean out any black "stuff". My bet, since you're posting this is the mixing elbow has never been off. Is this right? Anyway, clean out what I mentioned and see if the water flow is more than before. If there was junk in there it probably will be. If this "fixes" the water flow and steam problem then my next suggestion is to take it apart again, including the mixing elbow, and clean or replace it. As for the muffler that's another story. Hope this helps. Let us know what you find out.
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