Jump to content

Squealing Noise From Under Car


BrianR
 Share

Recommended Posts

I have a squealing noise coming from under my car. It is not engine related as it only happens when I'm moving. It is not the clutch, it is briand new and still does it when clutch is engaged. It was doing it beffore I changed the clutch.  I't sometimes gets real loud and sounds like a bearing. Center Bearing? Looks original and I have one on order. How about the speedometer cable. I tried to lube from above, but it looks like it is in two sections. Is that correct? Question about center bearing replacement. Does anyone know what size wrench to remove nut that holds the two sections of prop together? Any other ideas?

 

Thanks

Brian

Link to comment
Share on other sites

Sounds like a center driveshaft support bearing that's on it's way to CD's neighbor's pool.  You need to hasten its journey.  Those bearing failures usually start out by squealing when you first start driving (bearing is cold, what little grease is left isn't warmed up yet) and then goes away.  As the failure progresses, the squealing lasts longer and longer until it's all the time.  You can pretty much eliminate a tranny problem by letting the car coast in neutral--if the squeal continues, I'd suspect the center driveshaft bearing.

 

Two other things to check: 

 

1.   if you have A/C and still have the original compressor bracket with an idler pulley, check the pulley bearing.  I diagnosed a center support bearing failure that turned out to be that little 6202 bearing in the A/C idler pulley.  Easy to replace as it's held onto its bracket with a circlip.

2.  As you mentloned, the speedometer cable.  If your car has the " emission service" warning light atop the dash inside the seat belt warning light pod (75s & 76s), the speedo cable is in two pieces, with a gearbox interposed that trips the warning light bulb every 30k miles.  So you'll need to lube both sections of cable.  However, when the speedo cable starts squealing, the speedo needle starts twitching; if yours is steady, chances are that's not the problem, unless it's the lower cable.

 

cheers

mike

Link to comment
Share on other sites

Mike, do you have any more info on the speedo cable? mine twitches at low speeds and makes a rattling noise. The noise wasn't there when I got the car or when I removed the cable from the gauge the first time, but after the second time it started making a rattling noise and jumping a bit at low speeds. I'd prefer a one piece cable (two piece + gearbox sounds like more crap I don't need :) )... can it be retrofitted? 

Link to comment
Share on other sites

Re the speedo cable on your '76. 

 

You can replace the two piece cable/gearbox with a one piece cable assembly from a pre-75 car; just have to remove the old cables and gearbox, thread the new cable through the holes in the bodywork and reconnect at both ends. 

 

About the noise:  is it coming from the speedometer itself or the cable?  To determine, you need to drive along (do this on a deserted street or a big parking lot) with one hand up under dash fondling the speedometer cable.  If you can feel it twitching noticeably inside its sheath, then chances are good it's the cable. 

 

To make sure it's the cable, remove the instrument cluster from the dash, file down a piece of copper or aluminum heavy gauge wire (or something else easy to file) so that it's square on the end, and will fit into the speedo's drive slot.  Chuck the wire into an electric drill, then power up the drill in reverse and watch the speedo. If it still flickers and makes noise, the problem is in the speedo.  And if that's the case, drop me an e-mail and I'll send you an old column I did on troubleshooting and repairing wonky speedometers.

 

cheers

mike  

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.
With your permission we and our partners may use precise geolocation data and identification through device scanning. You may click to consent to our and our partners’ processing as described above. Alternatively you may access more detailed information and change your preferences before consenting or to refuse consenting. Please note that some processing of your personal data may not require your consent, but you have a right to object to such processing. Your preferences will apply to this website only. You can change your preferences at any time by returning to this site or visit our privacy policy.