Reply To: Mercury KF-3 problem finding socket to spline sweet spot

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At a swap meet some time ago, a pile of used lower unit odds and end for motors in KF3/ 5 thru Marl 6 series. Included were a number of new water pump cartridges and seal carriers,  The drive shaft seal is the same for KF-3/5 and later motors in the series, BUT, the seal carrier for later models is too thick. Correct seal carr/iers solved the problem of fit and a dozen or so attempts had the splines in socket.

Next issue is why does water pump cartridge so deep in gear case that back slit in case is blocked?  Second version of cartridge with both ring and retainer in place,    It looks like an additional spacer ring might match cartridge to inlet slits, but, that is not in parts manual and would leave few threads for cover.

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Louis     a