CA crank pulley question for
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Category: Allis Chalmers
Forum Name: Farm Equipment
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=198287
Printed Date: 26 Nov 2024 at 11:37am
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Topic: CA crank pulley question for
Posted By: captaindana
Subject: CA crank pulley question for
Date 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 |
Replies:
Posted By: Codger
Date Posted: 18 Nov 2023 at 7:15pm
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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?
------------- That's All Folks! |
Posted By: DaveKamp
Date Posted: 18 Nov 2023 at 9:57pm
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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.
------------- Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest. |
Posted By: captaindana
Date Posted: 19 Nov 2023 at 7:37am
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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? 🤣 ------------- Blue Skies and Tail Winds Dana |
Posted By: DrAllis
Date 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. |
Posted By: PaulB
Date Posted: 19 Nov 2023 at 8:04am
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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 |