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  1. J

    Power Head Replacement Merc 402

    Earlier this summer I purchased a fishing boat with a '78 Merc 402 (2 cyl 2 stroke). Long story short a previous owner overheated the motor (water pump) to the point that the pistons/bores are scored & compression is poor (115/100). I picked up a used power head with good compression (150/150)...
  2. J

    Long or Short Shaft?

    How can I tell if my 1978 Merc 402 is a long or short shaft motor? Are the dimensions standardized across all outboards, or is a Merc long shaft different than other mfg's? Thanks for the help, Joe in St Louis
  3. J

    Mercury 402 Outboard cooling system checks

    New member, first post. Great resource! Just picked up a 1978 Merc 402 that has been sitting unused for 5 years. Submerged the lower unit in a 55 gal drum filled with water & got motor running, but no water was exiting the tell tale. Suspecting water pump problems, I pulled the lower unit &...
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