Cam Phasing

jos51700 said
Normally I agree with you, but you're just flat wrong.

Notice: Not a keyway in sight....only bolts...

But yeah, Blower Drive Service doesn't know what they're doing.

View attachment 1716312750

(Hint: if the bolt is carrying load in shear, then it's lost tension for whatever reason. When a bolt is properly tensioned {a.k.a. tight}, then it sees virtually zero shear load in these applications.)

I will agree that keys can carry enough load to get the job done if you add a whole bunch of them, and call them....
splines.

I’m not wrong. I’m stating facts basically right out of text books. If the bolts stay tight, they see virtually no shear load you are correct, until the point that the force to drive the components (blower) exceeds the friction capacity of the bolted components and you get slip. Then the bolts are carrying load in shear. They get around this by adding multiple fasteners. That’s why there are 6- 3/8” bolts to hold that pulley on. And blower drive service knows what they’re doing, they sell “all crank hubs with a stock sized keyway AND a 1/4” keyway located 180 degrees from the stock one”