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Old 04-10-2019, 04:44 PM   #1
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engine flush

Can anyone tell me how to flush the coolant on my Lehman135. Doubt if the previous owners ever did this and would like to start fresh , however not sure how to drain and go about it. Thanks in advance.
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Old 04-10-2019, 06:52 PM   #2
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Not sure about that engine but the least intrusive way is removing the lower hose off the circulation pump. It doesn’t get it all out but you also don’t break anything
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Old 04-10-2019, 07:16 PM   #3
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Are you changing the coolant or doing a real flush? If it's in salt water you should be doing a raw side cleaning with Rydlyme or Barnacle Buster. There should be a plug on the side of the block, low down that drains the head and block. If you buy a valve and hose fitting to fit the plug, it makes it easier next time.
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Old 04-10-2019, 07:29 PM   #4
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I have SP225s and changed the coolant last year for the first time. I just drained the coolant and refilled since the PO did do routine maintenance on them. I did not use any flushing agent because the coolant had been changed regularly. If you are not sure how to do it exactly call Brian Smith at American Diesel. 804-435-3107
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