el_pescador
Silver Medal Contributor
"Hoggish1, the raw water pump
"Hoggish1, the raw water pump (the one in brass with two copper pipes below the alternator) is moved by the engine; it sucks raw water via the grids in the lower part of the outdrive, then circulates that raw water through the heat exchanger, the oil cooler (if fitted) and the exhaust manifold, then the raw water mixes with the exhaust gas and goes back to the outside of the boat via the exhaust pipe and the outdrive. The circulating pump (which is the one under the water tank in the front of your engine) circulates fresh water through the heat exchanger, then through the engine. In a nutshell, the raw water cools the fresh water, and the fresh water cools the engine. Similar to the radiator in your car, but instead of using air as cooling agent you use raw water.
If you don't get any suction, you may want to make sure that the raw water pump is actually turning. If the impeller does not turn, the pump will obviously not suck any water. You may want to make sure that the Woodruff key part 6 is installed between the raw water pump shaft 9 and the impeller 5
http://www.volvopentastore.com/SEA_WATER_PUMP_855578/dm/cart_id.657400424--categ ory_id.332893--list_time.1210180863--session_id.873611601--store_id.366--view_id .324014
and also that the crosspiece 3 is not missing; for it is, the pump will not turn.
http://www.volvopentastore.com/COOLING_SYSTEM_INDUCTION_AND_EXHAUST_MANIFOLD_AQ1 31A/dm/cart_id.657400424--category_id.332893--list_time.1210180987--session_id.8 73611601--store_id.366--view_id.324105"
"Hoggish1, the raw water pump (the one in brass with two copper pipes below the alternator) is moved by the engine; it sucks raw water via the grids in the lower part of the outdrive, then circulates that raw water through the heat exchanger, the oil cooler (if fitted) and the exhaust manifold, then the raw water mixes with the exhaust gas and goes back to the outside of the boat via the exhaust pipe and the outdrive. The circulating pump (which is the one under the water tank in the front of your engine) circulates fresh water through the heat exchanger, then through the engine. In a nutshell, the raw water cools the fresh water, and the fresh water cools the engine. Similar to the radiator in your car, but instead of using air as cooling agent you use raw water.
If you don't get any suction, you may want to make sure that the raw water pump is actually turning. If the impeller does not turn, the pump will obviously not suck any water. You may want to make sure that the Woodruff key part 6 is installed between the raw water pump shaft 9 and the impeller 5
http://www.volvopentastore.com/SEA_WATER_PUMP_855578/dm/cart_id.657400424--categ ory_id.332893--list_time.1210180863--session_id.873611601--store_id.366--view_id .324014
and also that the crosspiece 3 is not missing; for it is, the pump will not turn.
http://www.volvopentastore.com/COOLING_SYSTEM_INDUCTION_AND_EXHAUST_MANIFOLD_AQ1 31A/dm/cart_id.657400424--category_id.332893--list_time.1210180987--session_id.8 73611601--store_id.366--view_id.324105"