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Unread 06-27-2011, 04:18 PM   #1
Blue84JeepCJ7
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1984 CJ7 
 
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Location: Hahira, Ga
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Popping sound from driver rear wheel/axle

Hi guys, I keep hearing a popping sound coming from my driver rear axle. I do not know what it is and can't seem to find the culprit.

What I did find was a bad brake cylinder with wet brake pads. Looks like I have a one piece axle kit installed in my AMC 20. The flange has play in it. It will move in and out 1/16 of an inch with up and down play at 1/32 of on inch. Looking at the seal, held in with a retainer plate and four bolts, it could be grease oozing out instead of brake fluid. I did run low on brake fluid the other day and filled up the rear reservoir. I did jack up the passanger side and it too has the same play in the axle.

Anyhow, got a few things to fix but still dont know why I keep hearing popping noises. Worse in reverse. Could both bearings be going bad? Roaring of the tires makes it bad to hear or feel any vibrations.



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84 CJ-7
Chevy 350, Mild Cam. (325hp)
Summit (600 CFM) Carb.
1987 TH700R4 "K" Case
32x11.5x15 Cooper ATs
3" Body Lift
Be-Cool Radiator
Black Magic 175 Cooling Fan

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Unread 06-27-2011, 04:24 PM   #2
Skerr
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I have pretty much the same setup that you have, but it is very recent with little use so far. While "joy riding" down the road I had the same symptoms... popping and clicking. When I removed the rear wheel I found my brake job had failed on that side. The flat "spreader" bar that connects between the shoes had fallen out of position, allowing the auto-adjuster to also fall out of place. Fixed it up I was good to go. Hopefully, you will find something in the brakes to "ease your pain"!
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Unread 06-27-2011, 05:54 PM   #3
Rollbar
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Check the rear end fluid while it is level, bet it's low w/the oil all over the shoes. I will also bet (if the bearings aren't that gone by now) if you fill it up w/fluid it will stop until the fluid gets low and the bearings get hot.

Ask me how I know
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Unread 06-27-2011, 06:10 PM   #4
Blue84JeepCJ7
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Thanks guys, it does "pop" when cold such as backing out of my garage. If it puts me in the ditch before I get it fixed, I'll let ya know ;-)
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84 CJ-7
Chevy 350, Mild Cam. (325hp)
Summit (600 CFM) Carb.
1987 TH700R4 "K" Case
32x11.5x15 Cooper ATs
3" Body Lift
Be-Cool Radiator
Black Magic 175 Cooling Fan

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Unread 06-27-2011, 06:11 PM   #5
Trapshooter
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Pretty easy to tell the difference between 90wt and brake fluid.

No matter what, you have a brake job to do once you repair the leak.

Good Luck.............
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Unread 06-27-2011, 06:40 PM   #6
Blue84JeepCJ7
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Quote:
Originally Posted by Trapshooter View Post
Pretty easy to tell the difference between 90wt and brake fluid.

No matter what, you have a brake job to do once you repair the leak.

Good Luck.............
Yeah its brake fluid. Not even dripping on the ground.
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84 CJ-7
Chevy 350, Mild Cam. (325hp)
Summit (600 CFM) Carb.
1987 TH700R4 "K" Case
32x11.5x15 Cooper ATs
3" Body Lift
Be-Cool Radiator
Black Magic 175 Cooling Fan

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Unread 06-27-2011, 07:20 PM   #7
Rick7
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I had an '84 CJ7 which made a popping sound every so often from the rear model AMC 20 axle. Couldn't figure it out after a whole lot of looking. Later, I found the tube from from one of the axles would shift inside the 3rd member housing every so often. Those tubes are pressed in and not welded and apparently the pressing loosened up. drilled a couply of extra holes into the housing and used the holes to weld the axle tube properly to the housing.
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Unread 06-27-2011, 07:42 PM   #8
BagusJeep
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Those brake linings look a bit iffy as well. Maybe it is the angle but they look to be debonding. The popping sound may be the brake parts moving inside the drum as they are worn out or may be a consequence of the drum moving around with the play in the hub.

Sounds like you have enough movement to warrant new wheel bearings and seals but whilst there you may as well rebuild the brakes with all new parts, cylinder, shoes, adjusters, minor parts etc. Apart from installing the wheel bearing not a difficult job and you will improve reliability. Jeep parts are not expensive.
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Unread 06-27-2011, 08:28 PM   #9
Blue84JeepCJ7
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Quote:
Originally Posted by BagusJeep View Post
Those brake linings look a bit iffy as well. Maybe it is the angle but they look to be debonding. The popping sound may be the brake parts moving inside the drum as they are worn out or may be a consequence of the drum moving around with the play in the hub.

Sounds like you have enough movement to warrant new wheel bearings and seals but whilst there you may as well rebuild the brakes with all new parts, cylinder, shoes, adjusters, minor parts etc. Apart from installing the wheel bearing not a difficult job and you will improve reliability. Jeep parts are not expensive.
Yeap, gonna be a long 4th weekend!
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84 CJ-7
Chevy 350, Mild Cam. (325hp)
Summit (600 CFM) Carb.
1987 TH700R4 "K" Case
32x11.5x15 Cooper ATs
3" Body Lift
Be-Cool Radiator
Black Magic 175 Cooling Fan

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Unread 06-27-2011, 08:57 PM   #10
BagusJeep
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Happy 4th of July, much more healthy than a barbeque and beer
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Unread 07-01-2011, 06:46 AM   #11
Blue84JeepCJ7
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Brakes are fixed. All new hardware. The popping was from the brakes being applied, the brake line collapsing and not allowing the fluid to completely release, causing the brake pads to grab the drum and twist. I'm sure there may be more but that's about it from me!

Also I changed out the axle bearings. Another $200+ but figured I better do it.
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84 CJ-7
Chevy 350, Mild Cam. (325hp)
Summit (600 CFM) Carb.
1987 TH700R4 "K" Case
32x11.5x15 Cooper ATs
3" Body Lift
Be-Cool Radiator
Black Magic 175 Cooling Fan

Blue Jeep Club Member #212
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Unread 07-01-2011, 04:49 PM   #12
Blue84JeepCJ7
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Location: Hahira, Ga
Posts: 322
Yeap, brakes and axle bearings!

$600 plus two and a half days missed work.
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84 CJ-7
Chevy 350, Mild Cam. (325hp)
Summit (600 CFM) Carb.
1987 TH700R4 "K" Case
32x11.5x15 Cooper ATs
3" Body Lift
Be-Cool Radiator
Black Magic 175 Cooling Fan

Blue Jeep Club Member #212
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