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Old 08-30-2016, 01:36 PM   #70
smitty477
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City: Northport
Country: USA
Join Date: Aug 2015
Posts: 1,028
The upside down one is a bypass filter and does have an anti-drainback valve. The filter boss has a fixture that allows oil to flow back from the filter when opened - it will drain with or without that fixture open if you wait long enough with hot oil - about 20 minutes or so.
There have been a few of these installs that converted to remote oil filters but have had issues with volume and pressure as they utilized a couple of 90 degree turns with less than full port fittings.
Changing the oil hot with this set up and a plan takes about 2 hours for both mains and the genset start to finish.
My experience is that they will drain down given some time if the punched holes are put in and you make sure you have some other task to perform in between so as not to waste time.
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