Originally posted by Dave Neptune
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Overheating due to coolant loss
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Southcoasting, I "see" you have the water line into the manifold cut off. If you can just plug one end and blow into the other it should hold against you, if the pressure goes away quickly IE you have to keep blowing ~~ BINGO. This is not a good test but with the amount of liquid you are loosing the oral test might be fine. As a practice whenever I go to pressure check anything I do the same either by blowing or sucking. In many cases I did not have to hook up the gauge and stuff as the leak was obvious.
At 25lbs low it could well be the gasket but I would expect it to be lower.
Dave Neptune
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Originally posted by joe_db View PostSeeing as this is a fresh overhaul, is there a plug or something somewhere someone forgot to put back1971 Tartan 34C Sloop "NOVA LUNA", Rebuilt (2019) Fresh Water Cooled A4 (Bought boat in 2014)
1968 Tartan 27 Yawl "Destinada", rebuilt Old Lyme freshwater A4 (Sold boat in 2014)
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Originally posted by Dave Neptune View PostSouthcoasting, I "see" you have the water line into the manifold cut off. If you can just plug one end and blow into the other it should hold against you, if the pressure goes away quickly IE you have to keep blowing ~~ BINGO. This is not a good test but with the amount of liquid you are loosing the oral test might be fine. As a practice whenever I go to pressure check anything I do the same either by blowing or sucking. In many cases I did not have to hook up the gauge and stuff as the leak was obvious.
At 25lbs low it could well be the gasket but I would expect it to be lower.
Dave Neptune1971 Tartan 34C Sloop "NOVA LUNA", Rebuilt (2019) Fresh Water Cooled A4 (Bought boat in 2014)
1968 Tartan 27 Yawl "Destinada", rebuilt Old Lyme freshwater A4 (Sold boat in 2014)
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Then the manifold is the culprit for the gobs of water.
Important, get the coolant sucked out of the engine and be ready to flush the oil a couple of times once you get the new manifold on. Be careful removing the exhaust, old exhaust systems that have a year or 2 left can easily snap off with not much effort.
If you "hydrauliced" the engine you still may have a small breech in the head-gasket thus the low #3. Had you done a compression check any time before this incident? If so was #3 low?
Dave Neptune
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Originally posted by Dave Neptune View PostThen the manifold is the culprit for the gobs of water.
Important, get the coolant sucked out of the engine and be ready to flush the oil a couple of times once you get the new manifold on. Be careful removing the exhaust, old exhaust systems that have a year or 2 left can easily snap off with not much effort.
If you "hydrauliced" the engine you still may have a small breech in the head-gasket thus the low #3. Had you done a compression check any time before this incident? If so was #3 low?
Dave Neptune1971 Tartan 34C Sloop "NOVA LUNA", Rebuilt (2019) Fresh Water Cooled A4 (Bought boat in 2014)
1968 Tartan 27 Yawl "Destinada", rebuilt Old Lyme freshwater A4 (Sold boat in 2014)
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Just wanted to update on this...I had a spare manifold from my old engine which I had sandblasted and painted it...pressure was good on this one...
After about 9 hours or runtime most of which was a 5 day cruise to Martha’s Vineyard and Nantucket, all is good! There is an unusual amount of heat buildup on the aft end of manifold but maybe it’s normal...I will post something on this...all is good on this main issue though!1971 Tartan 34C Sloop "NOVA LUNA", Rebuilt (2019) Fresh Water Cooled A4 (Bought boat in 2014)
1968 Tartan 27 Yawl "Destinada", rebuilt Old Lyme freshwater A4 (Sold boat in 2014)
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