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06-05-2021, 09:57 AM | #1 |
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Wheel bearing preload
Is there a spec for front wheel bearing preload after repacking them? Or just use feel?
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06-05-2021, 10:14 AM | #2 |
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Re: Wheel bearing preload
No preload, just shy of being snug.
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06-05-2021, 10:20 AM | #3 |
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Re: Wheel bearing preload
Katy,
That is a good way to put it. I was taught that as you tighten to snug, you feel a soft zone, then a firm zone, then tight. This all happens in the last half a turn. You want to be in the firm zone toward the tight end but never TIGHT. Your explanation is much more concise. In other words, just use feel. |
06-05-2021, 10:37 AM | #4 |
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Re: Wheel bearing preload
I tighten them up first to make sure the bearings are seated then back off the nut. I then snug them up and back off one position on the cotter key. Ford said to snug then back off one position. The drums should be free to turn without drag but no perceptible play. Remember to put the cotter key in. I don't think it would hurt the bearing to be slightly snug but they should not be tight nor loose.
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. Last edited by nkaminar; 06-05-2021 at 04:27 PM. |
06-05-2021, 12:21 PM | #5 |
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Re: Wheel bearing preload
NO PRELOAD !!! . I snug the spindle nut up so I am sure all is well seated, .I fit a wheel with no hubcap grasp the wheel at 6 o clock and 12 o clock and adjust so I have just perceptible rock it it easy to tell bearing rock from kingpin wear . I have a box of axle nuts so I can choose the best fitting one . On a UK club tour a car pulled over as steering and braking stability was lost . The right front hub was smoking and the wheel at a wonky angle .The owner had completed a pre tour check around ,lug nuts etc etc . He found he could move the spindle nut by hand until it came up to the cotter key . He thought this cannot be right so he torqued it up tight , luckily he did not do both sides .The outer wheel bearing had disintegrated and set the grease on fire . The inner race was seized to the spindle and was freed by hefty bops with a big hammer backed up with another hammer . Luckily the spindle after a quick dress was good to go and a new wheel bearing plus grease was donated by another member on the tour (you never know when you might need one !!!) The big inner bearing was changed as well . The escaped rollers were retrieved from the hub and after an hours delay we were back on the road . The only other break down was a repro clutch arm which broke so that went home by Haggerty .
John in sunny afternoon Suffolk County England . In England a cotter key is a split pin and an English Muffin is a Muffin . Last edited by john charlton; 06-06-2021 at 02:29 PM. |
06-05-2021, 04:03 PM | #6 |
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Re: Wheel bearing preload
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06-05-2021, 04:21 PM | #7 |
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Re: Wheel bearing preload
I read somewhere that the pre-load for the front wheel bearings should be set at ten inch pounds. I tried to do that one time with an inch pound dial indicator wrench and I thought it was too tight. Tapered roller bearings in the differential are set at twenty inch pounds, but they are running in oil, the wheel bearings are running only in grease. Like most comments above I set it by feel.
If they are set too tight heat will build up on a long high speed drive and it could easily shear the spindle off. I saw it happen one time. Tom Endy |
06-05-2021, 09:51 PM | #8 |
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Re: Wheel bearing preload
Cleaned, packed, reassembled, and went by feel! Thanks for all the comments.
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06-06-2021, 06:51 AM | #9 |
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Re: Wheel bearing preload
Here's the technique I use:
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Bob Bidonde Last edited by Bob Bidonde; 06-06-2021 at 07:01 AM. |
06-06-2021, 07:10 AM | #10 |
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Re: Wheel bearing preload
Bob, is it necessary for me to paint a red arrow on my brake drum as you have done?
I am not sure but that seems like just way too much work. Plus your diagram does not show if it should be always painted at the same location |
06-06-2021, 07:18 AM | #11 |
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Re: Wheel bearing preload
Bob, is it necessary for me to paint a red arrow on my brake drum as you have done?
I am not sure but that seems like just way too much work. Plus your diagram does not show if it should be always painted at the same location. It appears that the red arrow must locate where the cotter pin is inserted. |
06-06-2021, 08:57 AM | #12 |
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Re: Wheel bearing preload
These are all good comments. I do like the red arrows Bob. For me, I don't want the bearings snugged up and I don't want any play in the bearing. Most often after you seat the bearing with a light load, back off the nut 1/4 turn then hand tighten back till it stops, then advance to the next available slot for the cotter pin, you will be good to go. Insert the cotter pin and feel for any loose motion in the bearing. If any, no good. Ed
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06-06-2021, 09:48 AM | #13 |
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Re: Wheel bearing preload
Fast forward to about the 4-minute mark and you will see a simple method to set wheel bearings in this video: https://www.youtube.com/watch?v=diKFNkIEmxA
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06-06-2021, 11:21 AM | #14 |
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Re: Wheel bearing preload
The slide is part of a presentation and the red arrows are animated to fly-in with certain parts of the text. But you-all get a bonus to see red arrows all at once.
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06-06-2021, 01:44 PM | #15 |
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Re: Wheel bearing preload
l.bacon said it best. Tighten very snug to set bearing, then back-off and retighten until snug BUT YOU CAN STILL SLIDE THE FLAT WASHER WITH A SMALL SCREWDRIVER. Have used this method on all wheel bearings for over 60 years with no problems.
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06-06-2021, 06:59 PM | #16 |
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Re: Wheel bearing preload
Isn’t there only the hardened retaining washer with the tab to keep it from spinning behind the spindle nut? I don’t see any other washer?
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06-06-2021, 08:27 PM | #17 |
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Re: Wheel bearing preload
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06-06-2021, 10:14 PM | #18 |
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Re: Wheel bearing preload
This is all you need to know to prevent having the preload too tight, period.
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06-07-2021, 09:41 AM | #19 |
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Re: Wheel bearing preload
There is no preload on the wheel bearings! There should be some play to allow for thermal expansion. Preloading the bearings increases the normal force which increases the bearings kinetic friction and yielding excessive heat.
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