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With nut / Without nut driveshafts

T

Topkick 767

New member
I have an 84 150 with pin on top.
Would this be a "with nut" or "without nut" shaft for water pump orders?
I have an 85 XR2 with no pin on top of drive shaft.
Would this be a ""with nut" or "without nut" shaft for ordering water pumps.
Thank you. đź‘Ť
 
For clarity on the subject:

Early units had the spring loaded pin. (Yes, you can push it in firmly).
The bearing is tapered smaller end down. The spring pushed the bearing into the race. The race is driven into the housing.

Later units had no pin. The bearing was tapered smaller end up & race was retained with the nut. Race was a slip fit into housing.

The gears were spiral cut opposite. Early units sort of sucked the gears together while later ones pushed them apart.

The machining of the housing for the nut caused the water pump base to be a different size. Requires different gasket & o-ring.

Essentially the same change was made on a MerCruiser about 1984. New design was called a "MR" drive for a year or 2 then remained Alpha.
 
Droid said:
For clarity on the subject:

Early units had the spring loaded pin. (Yes, you can push it in firmly).
The bearing is tapered smaller end down. The spring pushed the bearing into the race. The race is driven into the housing.

Later units had no pin. The bearing was tapered smaller end up & race was retained with the nut. Race was a slip fit into housing.

The gears were spiral cut opposite. Early units sort of sucked the gears together while later ones pushed them apart.

The machining of the housing for the nut caused the water pump base to be a different size. Requires different gasket & o-ring.

Essentially the same change was made on a MerCruiser about 1984. New design was called a "MR" drive for a year or 2 then remained Alpha.
Click to expand...
Thank you very much. Great explanation..
 
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