racervette69
Underachiever
Doing an engine change on the 63. Wanting to use the Howard Stewart water pump with a 3/4 shaft that's on the engine. But my clutch fan shaft pilot hole is 5/8. Do they make an adapter or only a spacer? Thanks.
3/4 water pump shaft to a 5/8 clutch fan shaft
- Thread starter racervette69
- Start date
gkz
Well-known member
Call Stewart. I needed spacers behind my pulley and they put them in the mail. Regardless, they should have an answer for you.
larrywalk
Well-known member
- Joined
- Jan 2, 2009
- Messages
- 78
Use a fan clutch for the later C3 corvettes ~1970 when they switched to the 3/4" water pump shaft. Or, use a C2 water pump.
SuperBuickGuy
Well-known member
3/4" Copper pipe should be pretty close to a perfect donor for a shim.
racervette69
Underachiever
Found a 1/2 spacer with 3/4 shaft pump hole and 5/8 fan shaft. Solved.
Twin_Turbo
Der Maulwurf
- Joined
- Mar 5, 2008
- Messages
- 7,579
You tell me, how are you going to shim up a 3/4 shaft to fit in a smaller 5/8 hole?
I used a M19 drill when I was in the same pinch after getting a stewart pump. Pulleys, fan.. not a prob. 3/4 is a hair larger than M19 but the drill will not drill to that size but a little oversize. Makes for a nice tight fit