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Re: yanmar 2gm20f
Recovery bottles do not rely on gravity, which makes it unnecessary to mount them above the pressure cap. Instead, they should be installed so that the bottle’s cold-level mark is no higher than the pressure cap. With this approach it is possible to remove the pressure cap for inspection purposes without coolant flowing from the recovery bottle and out the pressure-cap filler neck.
Probably about an inch off the bottom of the recovery bottle will suffice for proper flow.