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#1
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Diesel Compression Release ??
I could probably find the answer to this question if I removed the valve
cover on my engine.. Which valve does the compression release normally effect. Exhaust or Intake?? The reason I ask, I have had a problem with wet exhaust water getting back into the cylinder on my Entec/Farymen gen set engine. This happens when I have intial trouble getting it started and after I use the compression release. I'm thinking that the exhaust valve must be staying open during the down stroke (normal power stroke) while the intake is closed. This then sucks water in from the wet exhaust elbow (water is injected just after the bend of this elbow). Even if the compression release doesn't effect the exhaust valve, I suspect the exhaust valve may be sticking open after long idle period (week or so). Just curious. Steve s/v Good Intentions |
#2
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"Steve" wrote in : The reason I ask, I have had a problem with wet exhaust water getting back into the cylinder on my Entec/Farymen gen set engine. This happens when I have intial trouble getting it started and after I use the compression release. I do not know the answer to the compression lever, but when the engine is cranked and it does not start, the water accumulates in the exhaust system. There is no explosion to push it out and depending on how high it has to go it might as well come back into the engine. I have seen suggested somewhere that you close the water intake if the engine has to be cranked for a long time while it does not start or you do not want it to start (Winterizing). Steve s/v Good Intentions JM |
#3
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Sounds like you have the same genset that I do. I'll look into
the manual and let you know what I find. In any case, what you describe sounds like an installation problem. The seven cranks before the compression release closes should not produce the problem you describe. Have you contacted Entec? I had a problem with mine and they were very halpful. Doug s/v Callista "Jean-Marie" wrote in message ... "Steve" wrote in : The reason I ask, I have had a problem with wet exhaust water getting back into the cylinder on my Entec/Farymen gen set engine. This happens when I have intial trouble getting it started and after I use the compression release. I do not know the answer to the compression lever, but when the engine is cranked and it does not start, the water accumulates in the exhaust system. There is no explosion to push it out and depending on how high it has to go it might as well come back into the engine. I have seen suggested somewhere that you close the water intake if the engine has to be cranked for a long time while it does not start or you do not want it to start (Winterizing). Steve s/v Good Intentions JM |
#4
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On Thu, 21 Oct 2004 19:08:48 -0000, "Jean-Marie"
wrote: I have seen suggested somewhere that you close the water intake if the engine has to be cranked for a long time while it does not start or you do not want it to start (Winterizing). ================================ Yes, the owners manual for one of my old Volvo's recommended exactly that. |
#5
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Yes I can see how that would happen if the water lift muffler outlet were
lower than the engine exhaust manifold as well as the overboard. In my installation the engine exhaust elbow is at least a foot above the water lift muffler and the overboard discharge is below the water lift (not really a water lift in this instance). The only way the water loft could fill to the level of the exhaust elbow is if the overboard discharge were closed. If that were to happen the compression pressure would rupture something in the exhaust system. I still think the exhaust valve is staying open enough (when the engine is dead cold) and during the power stroke, the piston sucks water vapor into the cylinder. Not enough to cause a hydraulic lock but enough to show water traces in the lub oil after a dozen or so start attempts. (no other way for water to get into the oil in these engines since the water jacketed cylinder is independent of the crank case, as is the water cooled head. ). Steve s/v Good Intentions |
#6
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I seem to recall that the installation instructions state that exit from the
water lifter must go at least a foot above the waterline before exiting the boat. Does your's do this? Doug s/v Callista "Steve" wrote in message ... Yes I can see how that would happen if the water lift muffler outlet were lower than the engine exhaust manifold as well as the overboard. In my installation the engine exhaust elbow is at least a foot above the water lift muffler and the overboard discharge is below the water lift (not really a water lift in this instance). The only way the water loft could fill to the level of the exhaust elbow is if the overboard discharge were closed. If that were to happen the compression pressure would rupture something in the exhaust system. I still think the exhaust valve is staying open enough (when the engine is dead cold) and during the power stroke, the piston sucks water vapor into the cylinder. Not enough to cause a hydraulic lock but enough to show water traces in the lub oil after a dozen or so start attempts. (no other way for water to get into the oil in these engines since the water jacketed cylinder is independent of the crank case, as is the water cooled head. ). Steve s/v Good Intentions |
#8
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doug, knock it the frick off. you have not a frickin clew as to what is going
on. keep your ignorant on this subject self quiet. dougs, it is not hardly necessary for you to open your mouth on every subject. From: "Doug Dotson" AMcom Date: 10/21/2004 6:16 PM Eastern Daylight Time Message-id: Sounds like you have the same genset that I do. I'll look into the manual and let you know what I find. In any case, what you describe sounds like an installation problem. The seven cranks before the compression release closes should not produce the problem you describe. Have you contacted Entec? I had a problem with mine and they were very halpful. Doug s/v Callista "Jean-Marie" wrote in message ... "Steve" wrote in : The reason I ask, I have had a problem with wet exhaust water getting back into the cylinder on my Entec/Farymen gen set engine. This happens when I have intial trouble getting it started and after I use the compression release. I do not know the answer to the compression lever, but when the engine is cranked and it does not start, the water accumulates in the exhaust system. There is no explosion to push it out and depending on how high it has to go it might as well come back into the engine. I have seen suggested somewhere that you close the water intake if the engine has to be cranked for a long time while it does not start or you do not want it to start (Winterizing). Steve s/v Good Intentions JM |
#9
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weeneyn, do be quiet. adults are talking. go stand in the corner, for you are
utterly ignorant on this subject. get used to it. From: Wayne.B Date: 10/21/2004 8:16 PM Eastern Daylight Time Message-id: On Thu, 21 Oct 2004 19:08:48 -0000, "Jean-Marie" wrote: I have seen suggested somewhere that you close the water intake if the engine has to be cranked for a long time while it does not start or you do not want it to start (Winterizing). ================================ Yes, the owners manual for one of my old Volvo's recommended exactly that. |
#10
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Steve, exhaust gases ********MUST******** be present to move water from the
waterlift muffler overboard. If your engine is not starting, shut off the water intake valve or suffer the consequences. Yes I can see how that would happen if the water lift muffler outlet were lower than the engine exhaust manifold as well as the overboard. In my installation the engine exhaust elbow is at least a foot above the water lift muffler and the overboard discharge is below the water lift (not really a water lift in this instance). The only way the water loft could fill to the level of the exhaust elbow is if the overboard discharge were closed. If that were to happen the compression pressure would rupture something in the exhaust system. I still think the exhaust valve is staying open enough (when the engine is dead cold) and during the power stroke, the piston sucks water vapor into the cylinder. Not enough to cause a hydraulic lock but enough to show water traces in the lub oil after a dozen or so start attempts. (no other way for water to get into the oil in these engines since the water jacketed cylinder is independent of the crank case, as is the water cooled head. ). Steve s/v Good Intentions |
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