1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 846Get this manual
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Figure 4 Water Passages
CAU 'llO N: ea xchanger is quippt'd wiLh -;pound pre ss ure capTo re move apurn quart of tum allow pressure in cooling to escapeTh tu ru cap al Lh wav ofr
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