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Fresh Water Drain Points on Perkin''''s 4-108
I read through my Perkins overhaul manual to get an answer for you. Unfortunatly the manual didn''t mention where any of them were. I get the impression that there are several configurations to this engine so they may be avoiding the subject.
On my 4-108, I have drained the fresh water at the heat exchanger, which is the lowest point in the system. I know there are coolant hoses going to the hot water heater, so they could also be a place to start flushing.
When you re-fill it''s important to make sure the air gets bled out of the system to avoid air pockets. I read somewhere that the drain on the exhaust manifold should be opened to allow the air to escape.
I''ve been running a 50/50 mixture of antifreeze/corrosion inhibiter, and the coolant has always been nice and clean for the two or three years between changes.
You didn''t mention why you want to flush? If it is a heating problem, the heat exchanger is probably a better place to start.