Re: volvo penta 5.0 Gi
I've just repowered with a 2005 Volvo 4.3 GXi that has a flush hose between transom and raw water pump. When I introduce standard hose pressure water at engine idle, the hose water preesure supplies enough water to flush the engine and even back flush through the power steering oil cooler and out the sterndrive. Only with increased revs to about 1000-1100 does engine hog all the hose water and begin to also pull seawater through the outdrive. Since manual says to flush only at idle, you can save the shut-off valve, one more unnecessay part. And last fall, when I winterized the block, I simply put duct tape over the outdrive intake ports to not lose gravity-fed AF to the raw pump into the block. I first ran for 10 minutes on hose only, to heat up the block so I didnt have a long wait for the thermostat to open when on the AF.