- In the center, ours has a notch on both ends of the opening. Others have a groove that goes from end to end.
- On the exterior ours has raised middle with flat shallower edges. Others seem to have grooves.
Pulley Hub Differences
- Dennis Vogel
- 356 Fan
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Pulley Hub Differences
Is there any significance to the slight variations in the pulley hubs? The one off our T5 Super 90 is damaged enough that I am planning to replace it. In looking for a replacement, I noticed some minor differences.
1960 356 S90 Sunroof Coupe
1970 914-6
2014 Carrera S
1970 914-6
2014 Carrera S
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- 356 Fan
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Re: Pulley Hub Differences
Regarding the red oval around the upper center marked "notch". The photo is good. I think I see a rectangular key stuck in the keyway. That is a little wierd. My recollection is that the key is a half moon shape and that it is inserted into a half moon shaped slot in the surface of the shaft of the generator. The pulley hub slides on over the generator shaft and the previously inserted key.
I like the hub on the bottom. What are identified as grooves are indeed groves. They are a side effect of the way the flat surfaces on the sides of the pulley hub were generated. Clearly the plane defined by the hub flange (that clamps the pulley spacer washers) is still a plane. The grooves do not reduce the strength of the hub flange in any important way.
The broached keyway slot in the inside diameter of the hub is entirely appropriate. It slides over the previously installed half moon key mentioned above.
I like the hub on the bottom. What are identified as grooves are indeed groves. They are a side effect of the way the flat surfaces on the sides of the pulley hub were generated. Clearly the plane defined by the hub flange (that clamps the pulley spacer washers) is still a plane. The grooves do not reduce the strength of the hub flange in any important way.
The broached keyway slot in the inside diameter of the hub is entirely appropriate. It slides over the previously installed half moon key mentioned above.
- Dennis Vogel
- 356 Fan
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Re: Pulley Hub Differences
Right you are Robert. I wasn't expecting a flat key in the groove. A couple taps with a hammer and it popped right out. Revealing a groove all the way through. i wonder if I have a moon shaped key that was sheared off. Need to check on that now. Thanks.Robert Vaughan wrote: ↑Sun Jun 23, 2019 5:15 pm I think I see a rectangular key stuck in the keyway. That is a little wierd. My recollection is that the key is a half moon shape and that it is inserted into a half moon shaped slot in the surface of the shaft of the generator. The pulley hub slides on over the generator shaft and the previously inserted key.
1960 356 S90 Sunroof Coupe
1970 914-6
2014 Carrera S
1970 914-6
2014 Carrera S
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- 356 Fan
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- Joined: Sun Apr 20, 2008 12:54 am
Re: Pulley Hub Differences
The woodruff key is supposed to fit snugly into the shaft's slot and the hub easily slides onto the shaft.
The second photo looks like the side flats were milled to suit the flats of the shim bores, but the 3rd photo shows extra milling was done to make sure there's no rounded or radiused corners prohibiting the shims not
fitting flat to the the hub's flat sides; I've never seen those groves on any hubs I've used during my years.
The second photo looks like the side flats were milled to suit the flats of the shim bores, but the 3rd photo shows extra milling was done to make sure there's no rounded or radiused corners prohibiting the shims not
fitting flat to the the hub's flat sides; I've never seen those groves on any hubs I've used during my years.
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- 356 Fan
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Re: Pulley Hub Differences
Ah--faces; Not the sides.
- Vic Skirmants
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Re: Pulley Hub Differences
You had a sheared key because some dummy put the hub in a vice to torque the fan nut. One well=known poster recommends that; DON'T DO IT !Dennis Vogel wrote: ↑Sun Jun 23, 2019 8:11 pmRight you are Robert. I wasn't expecting a flat key in the groove. A couple taps with a hammer and it popped right out. Revealing a groove all the way through. i wonder if I have a moon shaped key that was sheared off. Need to check on that now. Thanks.Robert Vaughan wrote: ↑Sun Jun 23, 2019 5:15 pm I think I see a rectangular key stuck in the keyway. That is a little wierd. My recollection is that the key is a half moon shape and that it is inserted into a half moon shaped slot in the surface of the shaft of the generator. The pulley hub slides on over the generator shaft and the previously inserted key.
- Dennis Vogel
- 356 Fan
- Posts: 505
- Joined: Sat Oct 25, 2008 6:10 pm
- Location: Santa Rosa, CA
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Re: Pulley Hub Differences
Maybe it is a 912 variant? I see it in the Stoddard new part offering. Gold colored I'm guessing is a later release in yellow cad.Dick Weiss wrote: ↑Sun Jun 23, 2019 8:50 pm I've never seen those groves on any hubs I've used during my years.
1960 356 S90 Sunroof Coupe
1970 914-6
2014 Carrera S
1970 914-6
2014 Carrera S
- Al Zim
- 356 Fan
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Re: Pulley Hub Differences
I believe the pulley hub originated with the first VW's. It was used by VW into the early 50's until they cam up with a pulley that was easier to install since the hub and the inside of the pulley were welded together and cheap round shims could be used with a standard manufactured rather than a machined nut. I have put together a lot of generators and always tightened the blower with a new wood-ruff key
a good hub. Look the torque up in the shop manual and use a calibrated torque wrench. al zim Zim's autotechnik 800.356.2964 If you have a question call
a good hub. Look the torque up in the shop manual and use a calibrated torque wrench. al zim Zim's autotechnik 800.356.2964 If you have a question call
www.allzim.com
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