16 square hole water pump casting has string packing inside base of
iron oscillator cam I believe original to 1940 models
7 slit water pump has a thin wall cup with the packing inside, this fits over a lip in casting I believe original to 1941 models and some early postwar models
3 slit water pump (common to most postwar models) has a metal
case lip type seal pressed into casting.
ANY pump assembly will work with any model or year so substitutions
can and were made, Kiekhaefer offered a kit to convert to the
3 slit vane type pump. Kiekhaefer sometimes used old stock parts
Photos show a 7 slit water pump, brass oscillator cam, end in view of
oscillator cam with copper packing cup inside and a view of pump casting showing copper packing cup in place
The groove around the brass oscillator cam is so a short pin can be
held in place by a spring in groove…used when a sheer pin is used
to drive propeller. When clutch is used the spring and short pin are
not used, Instead a longer pin engages the front plate of the clutch
and the rear plate engages the propeller,
The iron and brass oscillator cams are different designs, BUT, the
prop shafts are the same on ALL versions from K1 to KE3 and
Wizards from WA2 to WG4 as well as both Sea Kings. Kiekhaefer
planned ahead for both rotax style pump and the clutch. All that
is needed to convert from oscillator type pump to a rotax vane
type pump is 1) 3 slit water pump housing 2) impeller drive hub
3) vane type impeller The rest can be transferred from the oscillator
type pump. The 3 types of water pump are completely different
but share some parts and are interchangeable as asemblies.
A design philosophy that was good for manufacturer, dealer
and customer.
