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1stSgtUSMC
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Joined: Jun 23, 2019
Posts: 44
Location: Maine then South Carolina
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 Posted: Sun Jun 21, 2020 4:25 am Post subject: Front wheels wobble while driving |
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Is it normal for my front wheel to woble when I hit a bump when going 35-45mph? I noice it when im going around a curve and hit a bump in the road as well. I would imagine this is not the norm, what do I need to replace/ repair to fix this issue? I recently replace the front outter bearings and cups hoping that would solve tthis issue with no luck even though the bearings needed to be replaced. Thank you in advance.
S/F
Kevin
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1stSgt USMC Active Duty
1952 M38
1966 614M Trailer |
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wesk
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Posts: 16377
Location: Wisconsin
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| Posted: Sun Jun 21, 2020 6:35 am Post subject: |
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Yes, that is called the "DEATH WOBBLE" and it is a very common issue with our old jeeps. Wheel bearings can be a part of the problem but the real culprit is usually the king pin bearings as most people know them or the upper and lower steering knuckle pivot bearings as we know them.
If you will take a minute and read Section IV on page 72 of your M38's Operator's Manual, TM 9-8012, 'TROUBLESHOOTING' you will find on page 103 a topic called "f. Shimmy at low speeds" where there are 6 possible causes listed.
Check each possible culprit before spending a lot of time or money on only one item.
Items "D & E" are the usual culprits.
To make a quick check you jack the front axle off the ground with a floor jack under the pumpkin. Grab the top of the tire with one hand and the bottom of the tire with the other hand and rock the tire/wheel assy in and out and if the top edge of the tire moves towards and away from the axle more than 2 to 5 degrees, adjust or replace the bearings. I try to always change them as a set. Again the instructions are at your finger tips in your TM 9-8012 page 262 Paragraph 230.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php |
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1stSgtUSMC
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Joined: Jun 23, 2019
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Location: Maine then South Carolina
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| Posted: Sun Jun 21, 2020 2:14 pm Post subject: |
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you wouldnt be so kind to give me the timken part number (D&E) would you?
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1stSgt USMC Active Duty
1952 M38
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wesk
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1stSgtUSMC
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Posts: 44
Location: Maine then South Carolina
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| Posted: Mon Jun 22, 2020 6:57 am Post subject: |
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and uless I am reading this wrong....I need 2 cone and bearing sets per tire..total of 4.
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Semper Fi
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1952 M38
1966 614M Trailer |
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wesk
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1stSgtUSMC
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Location: Maine then South Carolina
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| Posted: Mon Jun 22, 2020 7:17 am Post subject: |
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I have the hub nut socket....no spring scale.....Am I getting over my head?
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Semper Fi
1stSgt USMC Active Duty
1952 M38
1966 614M Trailer |
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1stSgtUSMC
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Posts: 44
Location: Maine then South Carolina
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| Posted: Mon Jun 22, 2020 7:21 am Post subject: |
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I also see a seal "Z". I am assuming I will need to replace that as awell?
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1952 M38
1966 614M Trailer |
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wesk
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| Posted: Mon Jun 22, 2020 7:39 am Post subject: |
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You'll find the instructions for the dis-assembly of the rest of the front hub & steering parts on pages 245 thru 252. The industry standard service life of rubber and neoprene parts is 8 to 10 years. Since these jeeps are well over 50 years old it is common practice to replace all seals that are removed or exposed during a repair action.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php |
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1stSgtUSMC
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Location: Maine then South Carolina
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| Posted: Mon Jun 22, 2020 9:27 am Post subject: |
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where does one buy a spring scale?
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Semper Fi
1stSgt USMC Active Duty
1952 M38
1966 614M Trailer |
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1stSgtUSMC
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Location: Maine then South Carolina
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| Posted: Mon Jun 22, 2020 9:48 am Post subject: |
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I can not find the part number for the "Z" seal...can you assist with this?
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Semper Fi
1stSgt USMC Active Duty
1952 M38
1966 614M Trailer |
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wesk
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| Posted: Mon Jun 22, 2020 10:13 am Post subject: |
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| Quote: | | where does one buy a spring scale? |
Just google Spring scale.
| Quote: | | I can not find the part number for the "Z" seal |
That parts page illustration is for a WWII MB not an M38. Your ORD 9 SNL G-740 parts manual illustration for that hub is where you should be looking. In that manual Fig 10-4 does not show seal Z because on the the later axles that seal is at the inner end of the axle shaft. The differential must be removed to replace that seal. Look at Fig 10-3 in your M38's Parts Manual. The seal we are talking about is B.
Most hobbyist prefer not to attempt the diff removal because the set-up and shimming required on installation is usually beyond their expertise. However each time that axle shaft is removed the odds are that the seal will be a bit damaged during each installation. So the choice is yours but most hobbyists ignore the age of that seal until they start getting diff gear oil on their brake shoes.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php |
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jnissen
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Posts: 93
Location: Austin Texas
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| Posted: Mon Jun 22, 2020 10:55 am Post subject: |
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Spring scale is a fishing scale. Not overly expensive or complex!
The seals on the knuckle vary. We used new rubber and reused the aluminum style backing plates. I’ve seen a variety of different solutions sold. We preferred the OEM type but upgraded to a neoprene seal In place of the felt.
BTW good time to pick up the proper lube. Check other posts as it’s detailed under knuckle lube. Good time to also inspect your axles and be fix joints. Modern alternatives exist that use spicer joints (U-Joint) that are much less maintenance intensive. |
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1stSgtUSMC
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Joined: Jun 23, 2019
Posts: 44
Location: Maine then South Carolina
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| Posted: Mon Jun 22, 2020 11:30 am Post subject: |
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tracking like a tank...I thought it was part of the bearing project that I am about to tackle.
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Semper Fi
1stSgt USMC Active Duty
1952 M38
1966 614M Trailer |
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1stSgtUSMC
Member
Joined: Jun 23, 2019
Posts: 44
Location: Maine then South Carolina
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| Posted: Fri Jul 10, 2020 4:34 pm Post subject: |
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completed the job and Wes it is cured! thank you kind sir!
S/F
Kevin
_________________
Semper Fi
1stSgt USMC Active Duty
1952 M38
1966 614M Trailer |
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