I've been reading about how to flush the coolant out of the Yanmar in my H306. I've read all the standard "open the petcocks and drain" technique, but I'm wondering about using a back-flush kit, like Prestone sells. Someone must have already done this, because there is a garden hose nipple in my heater line to the water pump. Here's what I'm thinking:
Remove the thermostat while the engine is cool. Attach a garden hose with water supply to the nipple. Attach another length of hose to the L-shaped outlet that goes onto the coolant fill port. Add a length of tubing to that, and insert the tubing into a 5-gallon plastic container, and flush out at least 3 gallons, or slightly more than the capacity of the system. When finished, I will have a system full of water. Now, when it's time to re-fill coolant, attach the tubing to the nipple with the 5-gallon container to catch water, start adding 100% coolant into the filler neck, and the coolant should displace the water into the container. Once 2 gallons of coolant are added, close off the nipple and replace the thermostat.
Any ideas or thoughts why this won't work?
Dave
Remove the thermostat while the engine is cool. Attach a garden hose with water supply to the nipple. Attach another length of hose to the L-shaped outlet that goes onto the coolant fill port. Add a length of tubing to that, and insert the tubing into a 5-gallon plastic container, and flush out at least 3 gallons, or slightly more than the capacity of the system. When finished, I will have a system full of water. Now, when it's time to re-fill coolant, attach the tubing to the nipple with the 5-gallon container to catch water, start adding 100% coolant into the filler neck, and the coolant should displace the water into the container. Once 2 gallons of coolant are added, close off the nipple and replace the thermostat.
Any ideas or thoughts why this won't work?
Dave
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