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Old 03-06-2017, 11:32   #1
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Coolant Loss

I have a Perkins 4-108 Diesel engine with low hours (510). In running about two hours under load it looses a quart of coolant. I have tested the radiator cap and system and both hold 10 psi. The overflow is not leaking. So where the coolant going? Is there any way it is boiling off? Baffeled in Florida!

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Old 03-06-2017, 12:35   #2
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Re: Coolant Loss

Your engine coolant might take a loop through your hot water heater, but it's unlikely to leak into the hot water since that system is normally pressurized. But if you have a leak inside the hotwater tank it is another place to look. Are you getting any leakage into the bilge or from the engine water pump? The water pump is the most likely source, usually the bearing seal goes, then the thing drips as a warning before the whole thing lets go.

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Old 04-06-2017, 09:24   #3
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Re: Coolant Loss

Thanks for your thoughts and suggestions. The mystery is the system holds static pressure although at ambient tempature. I will try turning off the coolant to and from the water heater. The coolant system is a closed system in all its loops and a leak in any loop should be reflected by a loss of pressure at the filler port.But thanks again-the beat goes on-bulletins to follow.
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Old 04-06-2017, 17:18   #4
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Re: Coolant Loss

I agree with the coolant pump theory. I had a leak on my Volvo 2003T that did not show during a static (engine not running) pressure check (about 1 hour). Turned out to be a coolant pump seal that leaked only when the pump was turning.
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