Aluminum pulley for M90 blower.

32truck

32truck

Junior Member
Well while I have the distributor out waiting for charlieNY to check it out, on to the next issue. My blower pulley is damaged because some numb nuts didnt have it tight and wallowed out the keyway. Any ideas where to get something like this? I know it's a v belt on a blower but I'd rather not completely change the belt set up.


Andy
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You'll probably need to have one custom made at a machine shop. Not a hard thing to do - but they'll need exact measurements on the shaft and keyway.
 
Or, [machine work again] simply bore it out, press in a sleeve, [ideally steel - more durable], scotch key it in place, bore and key it to suit...
 
Brian said:
Or, [machine work again] simply bore it out, press in a sleeve, [ideally steel - more durable], scotch key it in place, bore and key it to suit...
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Yeah I do have a lathe, so I was thinking about that. I don't have an end mill though. Still may attempt this.

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Bored&Stroked said:
You'll probably need to have one custom made at a machine shop. Not a hard thing to do - but they'll need exact measurements on the shaft and keyway.
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I've been calling around to a few machine shops without any luck yet.

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32truck said:
Bore .640 pulley diameter 4inches. Nah doesn't have to be aluminum.

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That is an odd bore size .640 = 41/64. Is that the shaft size? If it is 5/8 ( .625) I can probably help. Worst case would be boring out the 5/8 to 41/64.
 
If it was mine, I'd make a steel blower drive flange - similar to a crankshaft blower pulley flange. The flange would have bolts to bolt on an aluminum pulley. This way you can change pulley sizes quite easily. The flange should have a centering ridge on it (like a crankshaft blower pulley).
 
Also, you might consider using a dual-belt lower pulley - if it will clear your cross-member. It is much better to have multiple belts than just one. If you're going to the trouble of coming up with a new pulley drive system, might as well make it better.
 
Bored&Stroked said:
If it was mine, I'd make a steel blower drive flange - similar to a crankshaft blower pulley flange. The flange would have bolts to bolt on an aluminum pulley. This way you can change pulley sizes quite easily. The flange should have a centering ridge on it (like a crankshaft blower pulley).
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Definitely like this idea. Actually this makes the most sense. Definitely looking into this. Thanks so much. I agree this is a poor design.

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Bored&Stroked said:
Also, you might consider using a dual-belt lower pulley - if it will clear your cross-member. It is much better to have multiple belts than just one. If you're going to the trouble of coming up with a new pulley drive system, might as well make it better.
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I have about a 16th of an inch clearance with the crossmember unfortunately.

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marko39 said:
The last piece of the puzzle is what size is keeway and are you using an A belt or B belt?
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Not sure on the size of the keyway. I will measure it over the weekend. Its at my shop. Thanks.

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Cant you cut another slot say at 180 degrees . If its not timing anything , Ive done this on a few shafts that were messed up .
 
Ggmac said:
Cant you cut another slot say at 180 degrees . If its not timing anything , Ive done this on a few shafts that were messed up .
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Great suggestion, but unfortunately the entire hole got wallowed out.

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