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cooling water question,..
No, most water pumps are vane type impeller pumps. the vanes will block
the free passage of air. I assume that this is a rdaw water cooled engine. When was the last time you pickled your engine? When you heat sea water above 145 degrees the carbonates (building blocks of rocks) will precipitate (drop out) and form on the hot engine parts, especially the exhuast manifold. The carbonates are removed by 'pickling' using a boiler descaling compound (doesnt hurt the metal) or muriatic acid. Such descalers/acids are pumped through the raw water side and allowed to dissolve the 'salts'. Another possibility of cooling water blockage is degradation of the cast iron casting, especially in the exnaust manifold. Cast iron when it cools in the mold when manufactured cools and stratifies like an onion and when the internals start to corrode corrosion attacks one layer of the 'onion' at a time which will give off huge 'slabs' of rust. If the slabs are free they will migrate and block (usually) the outlet side of the exhaust manifold. When you shut down the slabs will usually fall to the bottom of the manifold and the engine will 'act normal' until either a slab gets caught in the flow or another breaks off and blocks the outlet. Typically one has to remove the manifold, turn it upside down, reach inside it with a stiff wire and break up all the slabs, then shake them out. A radiator repair shop that has ultrasonic cleaning means will be able to better clean out such a manifold. To prevent slab rust, never store the engine 'dry'. Always long term store the engine filled with an antifreeze that has corrosion inhibitors in it. Cast iron is a good material vs. water. Hot water will promote a 'good' from of rust (black/blue) which is ferrous oxide - a 'blueing'. Cold water and or especially letting the cast iron dry out will promote 'bad' destructive rust (red/brown) ferric oxide. Hope this helps. In article , ray lunder wrote: Trying to solve my water pump problem next. Q: If I disconnect the output side of my water pump, should I be able to blow air through it with my mouth and hear it come out the exhaust? I think the water jacket might be plugged up somehow. It's a small single cylinder diesel. |
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