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Unread 10-17-2009, 07:42 PM   #1
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AMC 20 Pinion Rotation Torque (seal replacement)

I pulled the yoke to replace the seal without thinking to check the rotation torque. I would like to tighten the pinion nut half-assed close to normal.

What in/lb reading have ya'll found when replacing the seal?

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Unread 10-17-2009, 10:04 PM   #2
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are your axles pulled too? its hard enough to get it with the carrier in it,if the axles are still in then its just a guessing game. tighten down til the yoke has no front to rare play, try as hard as you can to make it budge. then tighten it down maybe another 1/3 of a turn and call it good. this way you have eliminated about as much loose play as you can without over tightening and causing the bearings to burn up. its more of a feel thing that takes experience to get used to.

if you want to do it right, you can pull the axles and the carrier and use an inch pounds beam style torque wrench to measure the rolling resistance.
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Unread 10-18-2009, 07:40 AM   #3
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I pulled the axles and backing plates to prime and paint the housing.
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Unread 10-18-2009, 07:56 AM   #4
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Quote:
if you want to do it right, you can pull the axles and the carrier and use an inch pounds beam style torque wrench to measure the rolling resistance.
Do you have the specs?
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Unread 10-18-2009, 08:08 AM   #5
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Books says 20 to 40 INCH pounds.

Around 20 if the carrier is out, up to 50 when the carrier is in with the axles in.
Take the wheels off and make sure the brakes aren't dragging.
(I usually pop the drums off so there is no chance of dragging, and I get to inspect the brakes close up also)

The 'Rule Of Thumb' around the shops for years was 25 INCH pounds for the pinion preload,
Another 25 INCH pounds for the carrier load against the pinion.

Book says 20 to 40 INCH pounds, but I've set many up at 50 Inch pounds when dragging wheel bearings, seals, ect. and they worked fine.
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Unread 10-18-2009, 08:15 AM   #6
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Your post ^^^ came in before mine, I am looking at the 84-86 FSM. Now it makes sense, 17-25 in/lbs without the carrier, and with everything installed and simply replacing the pinion seal, the FSM stated to add 5 in/lbs and it could have been 25-40 in/lbs before I removed the nut.

The FSM indicates 17-25 in/lbs and reinstallation adding 5 in/lbs to the previously checked measurement. I could not detect any endplay, it may be because I was gripping the pinion tight enough a few minutes ago.

Just WAG, but 17 in/lbs may keep me out of trouble and within spec????
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Unread 10-18-2009, 09:40 AM   #7
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I recently replaced a M20 pinion seal. I had all the brake stuff off, and just the stock 2-piece axles in the tubes/case.

I checked the rotational torque before loosening the pinion nut, and got 14 in./lbs., so after I installed the new seal, I tightened the new nut to 19 in./lbs.

So, it sounds like you're close.

Rich
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Unread 10-18-2009, 07:30 PM   #8
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Thanks Rich.

I could not find a beam type in/lb torque wrench today, not even at cheapass Harbor Freight so I seated the yoke with a plastic mallet and tightened the nut until it made contact. I will have to torque it when I find a wrench.
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Unread 10-18-2009, 07:55 PM   #9
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Set your 'Clicker' to 15 or so, then tighten a little at a time until you get a CLICK.
Then bump up to about 20 or 25 and hope you DO NOT get a click.
If so, you overtightened...

I don't care for the beam type torque wrenches, the dial indicator type are MUCH better for doing this kind of work, but you will have to get lucky and find an old fart that still has one!
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