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Overheating on an a boat with Alpha drive can be caused by the following -
bulletBad impeller - if it has shed blades then you must look in the water passages until you find and remove all the pieces. Take a look at the housing for distortion
bulletWelch plug missing on upper (under decal on starb side)
bulletBad / missing seals on water tube or melted water tube base
bulletBad water hose, connects drive bell housing to transom assembly
bulletBad / missing seal on vertical drive shaft will leak exhaust gas into pump
 

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