M38 Popping noise in reverse?

redrad · Posted: Sat Feb 19, 2022 7:00 pm Post subject: M38 Popping noise in reverse?

While backing up and turning with front hubs locked in and front wheel drive engaged, I hear a hard popping noise coming from the front end. I have re greased ball joints and tried to find any thing loose or looks wrong but dont know what may be the problem. I hear nothing wrong backing up with hubs unlocked and out of front wheel drive. Any ideas what may be causing this or what to check next.

Thanks in advance for in advise.
_________________
Johnny D
1951 M38 Ser#1723

wesk · Posted: Sat Feb 19, 2022 7:22 pm Post subject:

Have you put the jeep on a hoist, ran the engine and engaged the 4WD & hubs in reverse?
_________________
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

redrad · Posted: Sun Feb 20, 2022 8:04 am Post subject:

No I have not, but I will in the next few weeks. What will I will be looking for?
_________________
Johnny D
1951 M38 Ser#1723

wesk · Posted: Sun Feb 20, 2022 11:37 am Post subject:

The source of the noise.
_________________
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

RonD2 · Posted: Sun Feb 20, 2022 5:27 pm Post subject:

Hi Johnny,
Before this surfaced, have you ever had your front steering knuckles and axles apart to inspect and service them?
Which type axle joints do you have? (The turn stop angle has to be adjusted differently for each type).

Curious you only have noise in reverse.
Please keep us posted what you discover!

Good luck!
_________________
Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

redrad · Posted: Tue Mar 29, 2022 5:28 pm Post subject:

Well I put the Jeep up on jacks and here are the results.

Test1. Started up motor put in reverse no popping nose. Turned wheel all the way left and right no popping.

Test 2. Engaged front axle performed same tests same result.

Test 3. Locked in front wheel hubs, performed same tests no popping.

I have rebuilt the front left wheel, new brake shoes, wheel cylinder, bearings and races, axle spindle, seals and knuckle lube.

I guess now will tear into passenger side and see if there is a problem.
_________________
Johnny D
1951 M38 Ser#1723

mdainsd · Member Joined: Oct 20, 2017 Posts: 444

Jacking it up and running it may not reveal the cause. reason: when doing this, there is no load on the drive components, you can't put any energy into the system to get it to recreate the noise.
_________________
'52 Dodge M37, '42 GPW, '48 FrankenJeep CJ2A/M38, '50 CJV-35(U), '51 M38, '42 WC-57 Command Car, '44 WC-51 Weapons , (2) M1941 Sperry 60" Anti-Aircraft Searchlights, John Deere M-gator, '44 White M3A1 Scout Car

keats · Posted: Tue Mar 29, 2022 9:09 pm Post subject:

worn axle joints are suspect.
_________________
Gary Keating
1949 C3A, 1952 M38,
1954 M170, 1957 Cj3B


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