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Old 12-10-2019, 12:50 PM   #1
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City: Powell River, BC
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Coolant drain cock Lehman 4D254

I have twin Lehman 4D254 80 hp Lehman's in my Cheoy Lee.
I want to drain, flush and fill coolant system with Delo ELC antifreeze.
Having trouble locating coolant drain on block.
Not sure how to drain system including berth heater and hot water tank lines.
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Old 12-10-2019, 01:49 PM   #2
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Call Brian at American Diesel. 804-435-3107. He is a guru on them.
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Old 12-10-2019, 03:24 PM   #3
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Find the lowest point in the cooling water system. Start there.

There is a petcock on port side of each engine. Loosen rad cap and drain.
Separately drain heaters. There should be 2 larger dia hoses coming from and returning to engine. (Usually just one engine) Remove lower hose and let it drain into shallow container. Transfer to old milk jugs for disposal.
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