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Allis chalmers b camshaft resistance
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Tcfcowboy View Drop Down
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Joined: 13 Feb 2025
Location: Tyrone
Points: 6 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tcfcowboy Quote  Post ReplyReply Direct Link To This Post Topic: Allis chalmers b camshaft resistance
    Posted: 11 hours 60 minutes ago at 8:03pm
Hello all, I am working on a total restoration of a 38 model B, I installed new Clevite camshaft bearings, and when I put the camshaft back in, it seem to have a bit of resistance, my question is, should the camshaft spin freely, or is it supposed to have some resistance? Thanks.
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KMAG View Drop Down
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Joined: 26 May 2020
Location: Elizabethtown,
Points: 689 		Post Options Post Options   Thanks (0) Thanks(0)   Quote KMAG Quote  Post ReplyReply Direct Link To This Post Posted: 11 hours 24 minutes ago at 8:39pm
Cam drives the oil pump, which adds drag. New bearings are snug on cam with break-in lube. Cam takes ~5' pounds to start turning and then less to continue turning. Cam should have no binding during rotations.
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8936 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 11 hours 14 minutes ago at 8:49pm
did you swell any driving in? Roll it around some and remove. Look for bright(tight) spots and scrape down.
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Joined: 08 May 2020
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Points: 1609 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 9 hours 51 minutes ago at 10:12pm
With nothing else attached (no oil pump, crankshaft, pushrods, etc.) the camshaft should rotate quite freely. I would use light oil for checking, use assembly lube for startup.


Edited by Les Kerf - 9 hours 48 minutes ago at 10:15pm
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Tcfcowboy View Drop Down
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Joined: 13 Feb 2025
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Points: 6 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tcfcowboy Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 59 minutes ago at 6:04am
It takes probably, 5-10lbs to turn it with nothing attached, But it rotates smoothly once I rotate it. I polished the camshaft journals with a buffer wheel. I’ll see if I can find a high spot.
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Points: 22698 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 33 minutes ago at 6:30am
Just keep turning it with penetrating oil while pulling it in/out. Use a speed handle or electric drill. Don't buff anything.
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