Home |
Search |
Today's Posts |
#18
posted to rec.boats.cruising,uk.rec.sailing
|
|||
|
|||
Volvo MD7A overheating
On Sun, 21 Dec 2008 22:50:10 -0500, hpeer wrote:
If you are going to install "taps" in the line for uses other then engine cooling you MUST be sure that these taps are isolated with valves and not used while the engine is running. There are valves and I will heed this admonition. The main strainer should/must be located below the water line so that with the sea cock open the strainer fills. The original installation of the strainer was most assuredly ABOVE the water line. I believe that it is still slightly above but I am not positive. Well now, you've got me digging into Calder. While the text does not specifically say to install the strainer below the water line the diagrams, although fairly diagrammatic, surely tend to indicate that is the way to do it. While a rubber impeller pump is self priming I believe it is advisable to make the system as much self priming as possible. Perhaps I should have said it is better to have the strainer below the waterline... The sooner you get water to the pump the less chance of overheating the rubber impeller. I do (at least at times) get water flow through the system with the engine off. This MUST be due to a siphon effect. I can't swear that it happens when I am having the overheating problem. You should have a vented loop somewhere in the system to prevent siphoning when the engine is off. I don't know how your engine is plumbed but most systems have a vented loop between the engine and the exhaust elbow. The top of the loop is above the waterline with a vent to some distance above the loop. If you don't have this it is likely that sooner or later you will fill the exhaust hose and then the engine with salt water.... which is a headache that aspirin won't cure :-) Well I now have one MORE thing to put on my summer to do list. Make sure strainer is below water level. Ideally the system from thru-hull thru the pump will be under water and self priming. Cheers, Bruce (bruceinbangkokatgmaildotcom) |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Volvo Penta V8 Overheating | General | |||
Volvo MD7A raw-water cooling flush | General | |||
Volvo MD7A raw-water cooling flush | General | |||
Volvo MD7A and MD5A difference?? | Cruising | |||
Need Exhaust Manifold (volvo MD7A) | Cruising |