Popping noise

[Deleted User]

I have a 53 Jet, It has been sitting a long time, I have already got it running, replaced floor boards, redone gas tank, brakes, etc. When I put it in gear and let the clutch out it makes a "popping" sound. I haven't replaced the u-joints yet, but I don't think it is them. I had my brother-in-law work the clutch while I looked underneath (from the side of the car) When he let the clutch out you could see the rear end and springs flex like they should, the popping sound is comming from that area. we jacked the rear wheels off the ground and went through the gears, no "popping", so does anybody out there think it could be the bushings in the leaf springs??, I have put some grease in them, but have never seen any grease come out.



Thanks in advance, Barry S.

Unknown

It appears that the noise occurs under load, when the vehicle's weight is on it. I would check the rear ujoint first. Also check the 'play' in the the rear end gears. Excess play could cause additional noise under load.

[Deleted User]

backtohudsons wrote:

It appears that the noise occurs under load, when the vehicle's weight is on it. I would check the rear ujoint first. Also check the 'play' in the the rear end gears. Excess play could cause additional noise under load.

Thank you, I will drop the drive shaft tonite and take a look



Barry S.

Geoff

Also check that the U-bolts holding the springs onto the axle are tight.

Geoff.

[Deleted User]

I pulled the drive shaft out, and the u-joints seem to be ok. But the yoke on the rear end, seems to have about a quarter turn before the wheels turn, (with no load, the rear wheels off the ground) also when I rock the yoke back and forth it feels like there might be some slop in ring and pinion.

How much slop should there be?



Thanks, Barry S.

Unknown

There's you noise. The clearance in the ring and pinion (what the yoke is attached to) is measured in the thousandths so a quarter turn means usually that the gears are junk. I don't have the specs at my fingertips at the moment though. If I remember right, the Jet has a removable rear cover on the differential. You could pull the cover and get some idea as to the amount of wear on the gears.

Geoff

That's a false reading you are getting there. The only way you can measure the backlash is between the actual gear teeth. By the time you magnify the take-up in the spider gears you will always get movement at the flange. Look elsewhere. Did you check the spring u-bolts? Are the axle nuts holding the hub on tight?

Geoff.

TwinH

My 49 C8 pops pretty good too. Not 1/4 turn yet,but I'm headed in that direction.

No gear noise so its not a ring&pinion backlash problem. My best guess is the shaft

in the diff that holds the spider gears is wearing a slot in the carrier. I must admit

though, I'm afraid to pull the 3rd member and see. Gonna try and locate a later

model Dana axle(following the thread about the 44 upgrade) then I'll just swap out

the whole axle. Couldn't stand to take if off the road for much more than a

weekend.

[Deleted User]

I crawled under my parts car and checked the yoke on it, there seems to be about the same amount of play on it too. I also took another closer look at the rear end that is popping, when you move the yoke, it moves less than a 1/4 turn before the wheels move. I guess I didn't look as close before. So I put the drive shaft back in, tried it again, still pops, but not every time. It almost sounds like a brake sticking.If I let the clutch out easy it dosen't do it, if I kind of "pop" the clutch it does it, but not every time. I am going too look at the brakes again and the u-bolts tonite.

I appreciate all the help, I will let you all know what it is if I find it. I restore Crosley's, this jet is a whole new world, Also it is a lot bigger!!



Thanks, Barry s.

Geoff

And remember to check the nuts on the end of the axle, they should be done up to 120lbs at least.

Geoff.

[Deleted User]

How did you fix it, Just re-torque the bolts??



Thanks for the info, Barry S.

[Deleted User]

Thanks!!



Barry S.