Front wheel bearing race wear pattern
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- Sergeant Major of the Gee
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Front wheel bearing race wear pattern
This is the inner front wheel bearing race on my friend's 45 MB. Bearing was full of grease, no water.
What causes this wear pattern?
Could it explain his slight shimmy at 35 mph?
What causes this wear pattern?
Could it explain his slight shimmy at 35 mph?
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42 GPW #91366, recovered blue drab registration 20200841, unit markings 104-415-I HQ-21 (Timberwolves)
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- G-Lieutenant General
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Re: Front wheel bearing race wear pattern
Metal Fatigue.
Time and load have taken it's toll on that race.
Could be the source of wheel shimmy. No way to properly adjust that bearing.
When replacing this race and bearing, I would recommend doing the others as well.
With this one like this and even if the others look OK, they were under the same load and probably not far from ending up this way as well.
Time and load have taken it's toll on that race.
Could be the source of wheel shimmy. No way to properly adjust that bearing.
When replacing this race and bearing, I would recommend doing the others as well.
With this one like this and even if the others look OK, they were under the same load and probably not far from ending up this way as well.
Mike Wolford
CJ-2A
VEP GPW
Comm./Inst. SEL
AOPA ( 50 yrs)
EAA ( 49 yrs)
4th Inf. Div. - 5th Inf. Div. - 2nd Armor Div. - CIB
CJ-2A
VEP GPW
Comm./Inst. SEL
AOPA ( 50 yrs)
EAA ( 49 yrs)
4th Inf. Div. - 5th Inf. Div. - 2nd Armor Div. - CIB
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- Jeep Heaven
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Re: Front wheel bearing race wear pattern
Looks like it sat with part of the bearing submerged in water. Dirt, lack of lube and misadjustment has also taken a toll. The water has long ago dried out..
Time for new bearings.
Time for new bearings.
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- Neal Sims
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Re: Front wheel bearing race wear pattern
Jeepdaddy,
Check out this TIMKEN BEARING DAMAGE ANALYSIS Guide, an interesting read.
https://www.timken.com/pdf/5892_Bearing ... ochure.pdf
Check out this TIMKEN BEARING DAMAGE ANALYSIS Guide, an interesting read.
https://www.timken.com/pdf/5892_Bearing ... ochure.pdf
Neal Sims
GPW-24397
GPW-27007
GPW-48005
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- dpcd67
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Re: Front wheel bearing race wear pattern
If you do a lot of old vehicles you will see the bearing indents on otherwise good looking races. Not sure how they get there, wear and load as stated, but they must be replaced as when you tighten up the hub, the wheel ratchets it way around making a lot of noise and probably future failure. Cause of shimmy; I don't think so. Yours are pitted from water.
Replace them.
Replace them.
U. S. Army 28 years.
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Re: Front wheel bearing race wear pattern
Neal,
Thanks for the link, it really explains a lot.
Brett
Thanks for the link, it really explains a lot.
Brett
1942 VEP GPW, J-2 winch, BC-659, 1919a4
1945 GPW, 1943 MBT
Sold - 1967 M151a1, 1943 MB, M416
www.ToThePointPolygraph.com
1945 GPW, 1943 MBT
Sold - 1967 M151a1, 1943 MB, M416
www.ToThePointPolygraph.com
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- Sergeant Major of the Gee
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Re: Front wheel bearing race wear pattern
Thanks for the great feedback. The outer bearing and race looked fine.
As a follow-up question, his 45 MB has very slight movement at the knuckle. I've worked on later CJ knuckles, but never the MB. Would you recommend breaking it down and replacing the kingpin bearings?
If so, what is the best way to disconnect the brake line so all the brake fluid doesn't drain?
As a follow-up question, his 45 MB has very slight movement at the knuckle. I've worked on later CJ knuckles, but never the MB. Would you recommend breaking it down and replacing the kingpin bearings?
If so, what is the best way to disconnect the brake line so all the brake fluid doesn't drain?
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Re: Front wheel bearing race wear pattern
Best to service the steering knuckles while you are at it. Once you remove the backing plate bolts the backing plates can be hung out of the way without disconnecting the hoses. Might be a good idea to service the wheel cylinders while you are at it.
2011 MVPA PIONEER AWARD - MVPA #1064
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- W. Winget
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Re: Front wheel bearing race wear pattern
Brake line just has to end up higher than the reservoir, so might be enough slack in the line to raise it up along the fender. Might be a good time to just change fluid anyway. Only a plastic cap might keep it in, I would want to avoid placing a cork or something that may leave residue in the line end.
Can't reach the Timken file from here, but I would guess condensation in the hub sitting for an extreme time in the same spot would allow for that pitting where grease failed.
Pop new races and bearings in and drive on. Kingpin bearings and parts are readily available to remove that slack too, it's just all so messy .
V/R W. Winget
Can't reach the Timken file from here, but I would guess condensation in the hub sitting for an extreme time in the same spot would allow for that pitting where grease failed.
Pop new races and bearings in and drive on. Kingpin bearings and parts are readily available to remove that slack too, it's just all so messy .
V/R W. Winget
Looking for 1918 Standard B 'Liberty' truck parts
- dpcd67
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Re: Front wheel bearing race wear pattern
If you have replaced CJ king pin bearings, then you can do an MB because it is the same basic design.
Spacers on both top and bottom though; later changed to just the top (better idea) .
Spacers on both top and bottom though; later changed to just the top (better idea) .
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Re: Front wheel bearing race wear pattern
If you do plan to service the upper and lower steering knuckle bearings, best to order the bearings, wiperseals and shims ahead of time. Attempting to reuse the may not result in sufficient combinations of shims to do the task.
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
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HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
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- Sergeant Major of the Gee
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Re: Front wheel bearing race wear pattern
Any favorite or recommended "pull scales"?
It sounds like the original 4-6 lbs of preload was later changed to 9-12 lbs. Do you recommend the later 9-12 lb specs for the MB?
It sounds like the original 4-6 lbs of preload was later changed to 9-12 lbs. Do you recommend the later 9-12 lb specs for the MB?
42 GPW #91366, recovered blue drab registration 20200841, unit markings 104-415-I HQ-21 (Timberwolves)
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Re: Front wheel bearing race wear pattern
Recommend 9-12, using scale is not all that easy due to short arc while testing drag. I do it by feel, it is a better way. Have a micrometer handy to check shim thickness in order to fine tune drag.
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
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Re: Front wheel bearing race wear pattern
Just to confirm before disassembly: Are worn king pin bearings the most likely reason for play in the steering knuckle?
42 GPW #91366, recovered blue drab registration 20200841, unit markings 104-415-I HQ-21 (Timberwolves)
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Re: Front wheel bearing race wear pattern
The chances are affermative, this service is much neglected on Jeeps and does require skil. The CV housings may require repairs from loose bearing races that are not secure in their seats.
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
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