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Crealock 37
676 Posts
This was on my 3GM30 but the 4JH2E (which I have in current boat) has the same style. The drain is the brass fitting left side of photo next to my thumb.

Off the bottom of the exchanger is another drain, this one has knurled knob on it.

The drain might also be of the style that has a knurled knob that is turned to drain the fluid. Most of the time there will be a piece of clear plastic tubing from the drain to direct flow to the bilge/off the engine so maybe look for those tubes to help find the drains.

On my 4JH2 I haven't drained the coolant yet but have noticed one at left rear corner of engine (about even with the bell housing) of the knurled knob type.
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