Thumping noise in my 62

[Dennis C.]

Re: Thumping noise in my 62

Wouldn't there be some indication of wear or contact?

It was minor and that's where the Dychem came in. It was obvious after applying it to the edge of the drum.

[Mike P.]

Re: Thumping noise in my 62

It was minor and that's where the Dychem came in. It was obvious after applying it to the edge of the drum.

I'll give it a try and respond back.

[Joe M.]

Re: Thumping noise in my 62

Mike, If the springs are old you might try replacing them. Too bad you couldn't isolate the sound to a particular wheel if that indeed is the problem.Does the car brake straight?Grooves worn into the backing plates?Maybe switch drums to see if the sound moved?

[Mike P.]

Re: Thumping noise in my 62

Mike, If the springs are old you might try replacing them. Too bad you couldn't isolate the sound to a particular wheel if that indeed is the problem.Does the car brake straight?Grooves worn into the backing plates?Maybe switch drums to see if the sound moved?

I replaced the front springs when I rebuilt the front end. It does tend to break to the right. I think that might be caused by old brake cylinders, which I plan to replace. I haven't tried switching brake drums.

[Paul J.]

Re: Thumping noise in my 62

Mike, you said a thump, not a screech, squeal, or scrape. Your problem in not a wear or contact issue. You have something loose, and it may be in your suspension. If you have a vibration in the steering wheel, (which you did'nt say) this is a classic tie rod end issue. A worn or loose tie rod end will vibrate at a specific speed, and will stop when you apply the brakes and "tighten" every thing up. It could also be a ball joint. Either way, give us some more information and we'll give it a shot.

Paul

[Mike P.]

Re: Thumping noise in my 62

Mike, you said a thump, not a screech, squeal, or scrape. Your problem in not a wear or contact issue. You have something loose, and it may be in your suspension. If you have a vibration in the steering wheel, (which you did'nt say) this is a classic tie rod end issue. A worn or loose tie rod end will vibrate at a specific speed, and will stop when you apply the brakes and "tighten" every thing up. It could also be a ball joint. Either way, give us some more information and we'll give it a shot.

Paul

Paul,

I replaced everything in the front suspension, except the king pins,since they seemed tight. Yes I notice a little vibration in the steering wheel in the 30-40 mph range like a pulsation.

[Paul J.]

Re: Thumping noise in my 62

Paul,

I replaced everything in the front suspension, except the king pins,since they seemed tight. Yes I notice a little vibration in the steering wheel in the 30-40 mph range like a pulsation.

I agree that you would'nt normally expect new parts to be suspect, but just because it was replaced doesn't mean that it's tight, or in the case of repro parts, that it's functioning properly.

Did this start before or after you did the front end work?

Pulsation? Not vibration? Looks like we're headed back to the brakes or bearings. If no one else has a suggestion, thighten your bearings, and use a torque wrench on the pre-load. If it still does it after this, put the old bearings back in.

I don't know how to test king pins yet, but it's in my future. Maybe somebody can chime in.

[Bill B.]

Re: Thumping noise in my 62

I feel your pain. I had similiar problem on a C4 (I have a 58 also and know the differences) which constantly thumped around the same speed and stopped when applying brakes and disappeared at higher speeds. After lots of aggravation and weeks of trying everthing, I found a steering bracket bolt not torqued tightly. It was a thumping not a cyclic sound. So, if it is THUMPING, I would think you have something worn or not tightened properly in the steering system components? I know, this doesn't help you one bit. I know you will find the problem.

[Bill B.]

Re: Thumping noise in my 62

Oh, by the way, the bold print didn't bother me at all since I can't hear. And, since I can't see very well the bold print actually helped me read it without my reading glassings.

[Mike P.]

Re: Thumping noise in my 62

I agree that you would'nt normally expect new parts to be suspect, but just because it was replaced doesn't mean that it's tight, or in the case of repro parts, that it's functioning properly.

Did this start before or after you did the front end work?

Pulsation? Not vibration? Looks like we're headed back to the brakes or bearings. If no one else has a suggestion, thighten your bearings, and use a torque wrench on the pre-load. If it still does it after this, put the old bearings back in.

I don't know how to test king pins yet, but it's in my future. Maybe somebody can chime in.

The noise has been there prior to rebuilding the front end. I did torgue the front bearings to 33 ft lbs, backed off and re-torqued to 12 ft lbs./ per the service manual. Maybe it's more of a rythmic vibration I felt in the steering wheel, versus a pulsation. It's hard to exactly describe it.

[Mike P.]

Re: Thumping noise in my 62

Bill,
I will check for any loose bolts. Glad to hear your doing okay.
Mike

[Jerry K.]

Re: Thumping noise in my 62

How old are you tires? After sitting for long periods of time they could have flat spots.Maybe having them checked and re-balanced would help.

[Mike P.]

Re: Thumping noise in my 62

How old are you tires? After sitting for long periods of time they could have flat spots.Maybe having them checked and re-balanced would help.

New balanced tires.

[Dennis C.]

Re: Thumping noise in my 62

Mike,

As a suggestion, maybe you need to start over with your troubleshooting. Wipe away everything you did or you think you did.

Go for a ride and make note of your noise, when you hear it, and exactly under what conditions. Then go over the entire car again. Do a complete inspection like you never saw the car before. Check the entire suspension for missing or loose hardware. Check the front end and steering linkage. After that move to the wheels, brakes, and bearings.

Dennis

[Terry D.]

Re: Thumping noise in my 62

Mike
Are there weights on the front brake drums? If not you might want to find an old shop that can still balance the tire while it is on the car. I had a similiar problem at a faster speed on my 62. Back in the day we used to knock off the weights because they would not let some aftermarket rims sit flat on drum.
Terry