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Front Wheel Bearing Adjustment
#1328509 Wed Oct 02 2019 12:36 PM
Joined: Feb 2019
Posts: 795
P
Phak1 Offline OP
Jack of all Trades, Master of None
On my 52’ Chevy 1/2 ton, I replaced the front wheel bearings with the new tapered roller bearings. The kit didn’t have any instructions so I followed the direction in the Shop Manual. Torque to 33 ft. lbs. while rotating the drum then back off the nut 1/12th to 1/6th of a turn to align the cotter pin.

After doing this I’m second guessing if adjusting the tapered bearings are the same as the original roller bearings. Your thoughts?


Phil

1952 Chevrolet 3100
Project Journals
‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: Front Wheel Bearing Adjustment
Phak1 #1328514 Wed Oct 02 2019 01:52 PM
Joined: Feb 2000
Posts: 4,170
J
Shop Shark
You should have some slack, but not very much. I like to set the bearings to zero lash after seating them, then back off till I know I have some clearance. I probably back off half a flat or 1/12, maybe just a touch less. Grab the tire at the top and bottom when off the ground and see if you have some wiggle, you should just a touch.

Re: Front Wheel Bearing Adjustment
Phak1 #1328546 Wed Oct 02 2019 06:41 PM
Joined: Dec 2017
Posts: 796
D
Shop Shark
Ball bearings get adjusted differently then tapered roller bearings. You might consider tracking down an early to middle 60s truck shop manual. Cars got tapered bearings I think around 62-63, not sure when the first pickup truck got them but likely close to that year. Use the procedure in the shop manual.


Mike
Re: Front Wheel Bearing Adjustment
Phak1 #1328608 Thu Oct 03 2019 07:48 AM
Joined: Feb 2011
Posts: 1,007
T
Shop Shark
Mercedes specificity's the correct method, you want .001 play on taper rollers. If they are too tight, they can drag on and spin the inner race on the spindle and weld to it or just plain burn it and ruin it, the spindle that is. I have seen that a few times. Ball bearings get a small bit of preload.

Last edited by Truckrolet; Thu Oct 03 2019 07:49 AM.

Ret, Machinist , Industrial Engine
Engine specialist
Re: Front Wheel Bearing Adjustment
Phak1 #1328613 Thu Oct 03 2019 11:27 AM
Joined: Feb 2019
Posts: 795
P
Phak1 Offline OP
Jack of all Trades, Master of None
Thanks all, fortunately my truck is waiting for a new master cylinder so I haven't driven her yet. I’ll readjust prior to her next road test. Thanks again!


Phil

1952 Chevrolet 3100
Project Journals
‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: Front Wheel Bearing Adjustment
Truckrolet #1328641 Thu Oct 03 2019 03:25 PM
Joined: Mar 2010
Posts: 9,412
5
Master Gabster
Originally Posted by Truckrolet
Mercedes specificity's the correct method, you want .001 play on taper rollers. If they are too tight, they can drag on and spin the inner race on the spindle and weld to it or just plain burn it and ruin it, the spindle that is. I have seen that a few times. Ball bearings get a small bit of preload.

The ball bearings do get a preload of 33 foot pounds, but this preload is then removed by backing of 1/12th to 1/6th of a turn of the spindle nut. Once the adjustment is complete, there is no longer any load on the ball bearings.
This is also the case for roller bearings. The question remains as to how many foot pounds preload needs to be applied to the roller bearings, and how far should the spindle nut then be backed off from that preload.
Does Mercedes mention how to accomplish .001 play?
Carl

Re: Front Wheel Bearing Adjustment
Phak1 #1328756 Fri Oct 04 2019 02:23 PM
Joined: Feb 2000
Posts: 4,170
J
Shop Shark
1977 Pontiac & 1973 Chevrolet shop manual:
tighten to 12 ft pounds while rotating wheel to seat bearings,
back off nut to just loose position,
hand tighten nut,
back off nut till hole aligns with slot in nut ( no more then 1/2 flat ),
this will give .001" - .005" free play.

Both these use tapered roller bearings with disk brake hubs.

1937 Chevrolet shop manual:
using a 8" wrench, tighten bearing as tight as possible while rotating the tire assembly, ( nothing longer then 8" )
back off one castellation or 1/12 turn,
install cotter pin if hole and slot align, if not, back off nut till they do align.
this will give an adjustment towards the tight side

Re: Front Wheel Bearing Adjustment
Phak1 #1328805 Fri Oct 04 2019 11:03 PM
Joined: Feb 2011
Posts: 1,007
T
Shop Shark
Ball bearings are not run loose. Like Joe H mentioned.
52Carl yes its very easy using an indicator I've done it many many times on other than mercedes and way before I ever saw their info.


Ret, Machinist , Industrial Engine
Engine specialist
Re: Front Wheel Bearing Adjustment
Phak1 #1328845 Sat Oct 05 2019 02:35 AM
Joined: Feb 2000
Posts: 4,170
J
Shop Shark
If one knew the thread count of the spindle, you could figure out how much 1/12 of turn would back off the nut. Then from zero lash, back off .003 to ,005 thousand't of an inch.

Re: Front Wheel Bearing Adjustment
Phak1 #1328958 Sun Oct 06 2019 01:45 AM
Joined: Feb 2019
Posts: 795
P
Phak1 Offline OP
Jack of all Trades, Master of None
Classicindustries lists the nut as 3/4”-20. 1” divided by 20 =.050”. Divide that by the 1/12 of a turn of the nut you get .004” (rounded to the nearest .001”.)
https://www.classicindustries.com/product/1952/chevrolet/truck/parts/*k9142.html


Phil

1952 Chevrolet 3100
Project Journals
‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator

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