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CA crank pulley question for
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captaindana View Drop Down
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Joined: 14 Sep 2009
Location: Fort Plain, NY
Points: 2460 		Post Options Post Options   Thanks (0) Thanks(0)   Quote captaindana Quote  Post ReplyReply Direct Link To This Post Topic: CA crank pulley question for
    Posted: 18 Nov 2023 at 7:06pm
You engine pros.




What size do I have the new pulley machined to??

Thanks. Dana
Blue Skies and Tail Winds
                          Dana
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Codger View Drop Down
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Joined: 23 Dec 2020
Location: Illinois
Points: 2050 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Codger Quote  Post ReplyReply Direct Link To This Post Posted: 18 Nov 2023 at 7:15pm
I would not rely upon your measurements method for accuracy. Use the same method for both items meaning use a snap gauge in the bore of the pulley and measure across the snap gauge. I've seen a lot of those calipers not measure the same from external to internal. 

I would think 0015, to .002 snug fit would retain it if an interference fit for that size shaft. That will be tight to push on and need a puller to remove. 

I don't know the application as never have worked with one of those and cannot tell from the photo is the crank snout is internally threaded or not?
A career built on repairing and improving engineering design deficiencies, shortcomings, and failures over 50 years now.
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DaveKamp View Drop Down
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Joined: 12 Apr 2010
Location: LeClaire, Ia
Points: 5754 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DaveKamp Quote  Post ReplyReply Direct Link To This Post Posted: 18 Nov 2023 at 9:57pm
Hi Captain D!

I'm finding it hard to accept that the sheave you have, isn't machined to proper ID for your CA's crank nose.  As Codge noted, a 0.0015" interferance fit would be what I would expect between the nose and sheave bore.  What I would do, is pull out the key, and carefully check the bore with a nice flat file, and any places that suggest irregularly high spots, gently bring them down, then a gentle dressing with some medium fine emery cloth... then wipe it clean, clean up and verify the keyway fit... then I'd put the sheave in the oven at 400 degrees for 16 minutes (which just happens to match the cooking time for a Tombstone 4-Meat!!), put a little oil on the snout, and slip it on... have a piece of softwood and a 4lb mallet to send it rest of the way home once it's started on...

And no, Codge-  the nose has a conical cut to accept a lathe tailstock live center.


Edited by DaveKamp - 18 Nov 2023 at 9:59pm
Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.
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captaindana View Drop Down
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Joined: 14 Sep 2009
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Points: 2460 		Post Options Post Options   Thanks (0) Thanks(0)   Quote captaindana Quote  Post ReplyReply Direct Link To This Post Posted: 19 Nov 2023 at 7:37am
Thanks guys!   My day has started by studying thermodynamics with press fit / interference fits on the top of the list. Interesting stuff but I keep dozing off…. But really Dave, I have Red Barons which specifically say 400* for 15 to 17 and Tony’s pepperoni calling attention after 17 up to 20 minutes. Do I have to trade these in for Tombstones? 🤣
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20479 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 19 Nov 2023 at 7:42am
Pulley should pretty easily slide right on at room temps with some penetrating oil. Get a different pulley. It ain't right.
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PaulB View Drop Down
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Points: 4727 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PaulB Quote  Post ReplyReply Direct Link To This Post Posted: 19 Nov 2023 at 8:04am
The pulleys on the BE/CE and all the small D series engines are a FRIM press fit.  Unlike the 201/226 engines that have a tapered bolt to lock the pulley to the crank, the "small block" engines rely on a tight fit to keep them in place as the small set screw only locks against the key, not into a tapered hole in the crank.
  This is why so many of the "small block" pulleys are cracked or broken by uninformed persons using a jaw puller without backup to remove them and also not removing the sometimes second set screw. 
  The same goes for reinstalling them, just wacking them on cold is a sure way to destroy the "small block" pulleys, Heating them slightly and LIGHT force with a piece of soft metal against the pulley is the way to safely put the pulley back on.
 If the pulley slides on easily when cold, it will surely come loose.
If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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