Venting coolant system on 6BTA 370 diamond

[Troels]

 Hi all,  I had a mishap with my water heater which is connected to port engine cooling system. Short story; the heater has “collapsed” causing some rust  in the cooleant. I have exchanged the waterheater and drained the dirty coolant from the engine. Next step is to run a coolant system cleaner through the engine before I refill with new coolant. Now the simple question is how to correctly fill the coolant system, I am mainly thinking about the correct venting procedure ? I have found pictures of the coolant drain position here on sbmar, but not on where the vent(s) are located and how to correctly fill the engine ?

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[Troels]

Thanks for the advice. Now I am just eager to get the season started

[Rob Schepis]

"Spitters"

Keep the coolant an inch or so from the top of the tank so the “spitters” can breath easy

[Tony Athens]

The small hoses going to the coolant tank are vents per se, ( I call them “spitters”)  but the system still needs some help.. Follow Rob’s lead.

 

 

Tony

[Troels]

Hi Rob, thanks for quick reply. I take it there is no “vent” valves I need to open beyond keeping the tank cap loose ?

[Rob Schepis]

 When you refill the coolant refill very slowly and this will help with eliminating any air trapping. Squeeze the coolant hoses to push out any trapped air.  On your first run leave the expansion tank cap loose and bring her slowly  up to operating temperature to open the thermostat, 1,000 to 1200 rpm’s  should do it.  If you watch the temp gauge you may see a quick jump of the gauge but it should stabilize. Then let her cool down and top off and this  should have burped out any air and prevent any hotspots. Never hurts to do it a second time.   Also sounds like a good time to remove the recovery bottle and give it a good cleaning, that small hole at the bottom of the recovery can easily plug and prevent the bottle from doing it’s thing…

[Author]

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