Yanmar 3gm30 cooling system The motor is a Yanmar 3GM30F with a remote reservoir and a SureCal calorifier. I've located 2 drain petcocks: port side just behind the alternator ; stbd side above the oil dipstick. It specifically addresses the Yanmar Japanese Yanmar 3GM, although this procedure should be the same for the European Yanmar 3GM as well. I'd like to change the coolant in my Yanmar 3GM30F. A step by step guide as to how we flushed through the coolant system on our Marine Yanmar 3GM30F Diesel engine. These are 1/2 diameter screw knobs with clear plastic drain hoses. Have you bled the engine? The shut down might have been coincidental to the amount of time it took for an air bubble to work its way through. There are 2 drain points for the coolant, 1 near the oil filter and 1 under the heat exchanger. Manuals and User Guides for Yanmar 3GM30 Marine Diesel Engine. I hired a Yanmar shop to do the first flush of my 4JH3-TE, and there is a very easy and mess free way to completely drain the block and collect all the toxic (see Chuck's post) waste antifreeze. There is also a drain point for the sea water on the heat exchanger. To prevent the seawater side from freezing. The motor is a Yanmar 3GM30F with a remote reservoir and a SureCal calorifier. If it's not that, then I ain't got nothing more helpful. Changing the engine coolant in the Yanmar 3GM30F series Engine This article provides a set of directions for flushing the engine antifreeze in the Yanmar engine. As to how to drain the Yanmar fresh water cooling system, I agree the shop manual is short on details. . We have 5 Yanmar 3GM30 Marine Diesel Engine manuals available for free PDF download: Service Manual, Shop Manual, User Manual, Operation Manual Why is he putting antifreeze in the raw water (sea water) side? The coolant is in a closed system. sjhtaw wvjfml oufo mnpr nrl jyxry iou zdez ehdterv ipja