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I downloaded Mercury factory training charts and the instructions for the KB-1 Comet which uses the oscillator style pump.Don’t forget to remove the small cir – clip part # 73 from the brass eccentric cam! be careful not to lose??? they go flying!
I tap the drive pins out with a drift pin and make new ones from K & S brass rod available from Hobby Shop or good hardware store.
It seems to me that you are referring to the 2nd type (brass eccentric cam) I believe the K3 would originally have had a 1st type (iron oscillator cam) If so, there is an internal pin in the oscillator cam, To remove this pin, after removing the sheer pin (which drives the propeller) raise the oscillator cam up the prop shaft so that pin aligns with holes in oscillator cam and push pin out. There should be a spring between sheer pin and end of oscillator cam to prevent cam from moving up shaft during operation.
If memory serves the sheep pin is 3/16″ and the oscillator drive pin is
3/16″ .Both pins can be made from 3/16″brass rod using a file and small vise.Getting length right on internal pin is a fit and try, Sheer pinFinding brass rod can be a now you see it and now you don’t proposition. .I bought a 3 foot length of 3/16″ at Lowes and have not
see it there since..I was at Tractor Supply and found one 3/16″
brass rod in the rack…It appears that both stores do not restock when
sold out. Cutting brass rod to exact length can be tricky,,,,best to cut
a little long and file to fit. Sheer pin can be fit to length of slot
inside hub or propeller, same rounding of ends and reduction
of diameter applies.
Servicing a water pump usually involves making replacement pins,
3/16″ brass rod may also be used to make High Steed needle for AJ
series carburetors and an assembly tool to hold rod cap in place with
the needle bearing steel rods
Measure from end or rod to cutting wheel for length, the cut end(s) will be slightly thicker. Chuck in poor man’s lathe (electric or manual drill) to round ends and reduce the raised diameter.Louis
Bob, the retention pin is perpendicular to the prop shaft. It goes through both the eccentric and the prop shaft. Just got mine out just before dinner. I was tapping the “pin” back and forth with a drift set and decided to add some heat. Removed the impeller and after a short heat up period, it started to move considerably faster. The pin must be brass because it’s beat, crooked and junky. Now it’s on to clean up, make a new gasket, lubricate and reassemble!
Keep at it, you’ll get it out.
I believe my eccentric is steel. It’s from my 1940 K3.
Scott
16 square hole water pump casting has string packing inside base of
iron oscillator cam I believe original to 1940 models7 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 partsPhotos 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.
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