Any ideas on this issue??

[rp23g7]

Lets play the "what the heck is this noise" game.

Early this week a new noise has popped up. It got a little worse yesterday.

My Coronets 440 has a alternator and Power steering, and the water pump of course up front, and the 727 for a transmission.

I have developed a noise i wouldnt call a squeal, but it sounds like a rotating bearing going bad. Not a squeal though. And it isnt really effected that much by rpm.

So, today, i was paying more attention, it does it in Park, Nuetral and Drive.

So i am ruling out the input shaft bearing on the trans.

I took off the Power Steering belt, the alternator belt and started the car.

It still made the noise.

I thought it may be some strange vacume leak, so i squirted starting fluid around the intake manifold and carb.

No change,

Thought it may be some strange airfilter leak, so i took the air cleaner off with the motor running.'

Same sound. If i go from Drive to nuetral or Park the noise stops for a few seconds and starts again.

I dont know what else it could be,


Anyone got any ideas?

 

[72 Charger SE]

Really hard to tell without hearing it. And keep in mind that this is not my area of expertise. But I'll take a crack at it anway. Maybe I can at least give you an idea for something else you haven't looked at yet.

Is the noise toward the rear of the engine then?

I assume that when you checked for vacuum leaks that you also checked lines for distributor, brake booster (if equipped), and all vacuum port block off caps.

I might be missing something, but how did you rule out the input shaft bearing? Doesn't that shaft pretty much always spin from the stator in the converter? I suppose I could look it up to be sure.

Even if it doesn't, the torque converter is always spinning in the pump, so you have moving parts there that could fail. I had a pump fail once where the lugs that the converter engages onto sheared off while I was driving down the road with no load on the engine, leaving me with no drive in any gear. It would seem to me that if the sound changes with gear selection in the transmission that the noise is likely related to the transmission.

Does the noise change in any of the other transmission gear selections?

One other noise that comes to mind that I encountered once about 20 years ago was when my ex's brother put a new/remanufactured starter on the 383 for his 70 Super Bee 4 speed. Starter was defective, and would not disengage from the flywheel. He ran it up to 7000 rpm several times and back down to idle, but it never disengaged. A few more trips to 7K just to make sure that it would fail their tests when we took it back, and it was back to the store for another one, which worked fine.

Looks like you are about a 3 hr drive from me or I would suggest meeting with you, or having someone on here take a listen with you.

 

[rp23g7]

Yeah, strange noise, I forgot the innards of the TC are still turning in park. The trans does have a shift kit in it, i will crawl under when i check the tc bolts and see if the vacume modulator is making noise.

It does have a shift kit in it. It does a hard shift to 2nd and drive, but the shifting hasnt changed since the noise popped up.

But the noise really seems like its coming from the front, weird. I will try a few things.

Where do you live 72?

 

[rp23g7]

WTF................ removed inpection plate, TC bolts not loose, no leaks either.

Started it up, no noise. took it for a drive, about 2 miles or so, noise started.

Came back, jacked up car.

Its not coming from the bell housing. it sounds like its coming from the front of the motor.

I ran it yesterday without the belts hooked up, so Alt, PS and Water Pump were not turning. And it still made the sound.

WTF..... Crankshaft?????, definatley sound like the front of the motor.


Sounds kinda like a belt does when its squealing on a pully lightly. But it did it without belts on it.


arrrggg

 

[rp23g7]

Well, it was too nice of a day to leave it in the garage, so we went on a cruise. 60 miles didnt change anything. Still made the sound at low speed. Freeway speed seemed ok, couldnt hear it when next to jersey barriers etc.

Got back, noise still the same, no worse.

Had a neighbor listen with a dowl. He couldnt figure it out either.

 

[72 Charger SE]

Just thinking out loud....

So what else is moving at the front of the engine?

Only thing that comes to mind is the distributor, timing set, harmonic balancer, and oil pump.

Know anyone with a stethoscope?

Possible guesses - bearing in distributor; distributor drive shaft/bushing grabbing/spinning when it shouldn't; bolt on cam coming loose and rubbing inside of timing cover.

BTW, I'm about 3 hrs south of you on I-5 (Cowlitz County)

 

[rp23g7]

My neighbor and i listend with a dowel. The dist shaft wasnt making any noise. We listened to the top of the timing cover, no noise there. Cam? Maybe, its a stock 70 440 from a C Body, from the look of it, i dont think its ever been apart. That would be a strange occurance.

Oil pump, maybe, i am changing the oil today, i will listen to it when i run it.

 

[daredevil]

did you pull waterr pump belt? if not maybe water pump bearing.Or maybe a timing chain on the cover.

 

[daredevil]

So what else is moving at the front of the engine?

Only thing that comes to mind is the distributor, timing set, harmonic balancer, and oil pump.

Know anyone with a stethoscope?

Possible guesses - bearing in distributor; distributor drive shaft/bushing grabbing/spinning when it shouldn't; bolt on cam coming loose and rubbing inside of timing cover.

BTW, I'm about 3 hrs south of you on I-5 (Cowlitz County)

didnt see your post at first but we think a lot alike

 

[rp23g7]

did you pull waterr pump belt? if not maybe water pump bearing.Or maybe a timing chain on the cover.

Yeah, ran it without the belts and had the same issue, gonna listen to the oil pump this morning

 

[72 Charger SE]

didnt see your post at first but we think a lot alike

Are you seeking help for that? I've been told I need to a couple of times :grin:

 

[Revhendo]

Just kibbitzing, but is the dampner tight? Could be the oil slinger behind the timing cover making noise? I have also heard a motor with no crankcase ventilation sucking air in through the rear main seal. (PCV clogged, causing the problem, very weird.)

 

[rp23g7]

Just kibbitzing, but is the dampner tight? Could be the oil slinger behind the timing cover making noise? I have also heard a motor with no crankcase ventilation sucking air in through the rear main seal. (PCV clogged, causing the problem, very weird.)

I believe so, i was using the bolt to turn the crank, to reinstall the points after my Petronix fiasco yesterday. Motor has good PCV and breather cap.

My neighbor and i listened to it with a wooden dowl the other day, couldnt figure it out.

Listened to the Dist shaft, water pump, PS and ALT, timing housing, both headers, intake manifold. It sounds like the front of the engine, i was thinking Oil pump, but it seems that noise would migrate up the Dist shaft also.

I changed the oil yesterday, nothing strange came out of the filter or in the drain pan. I didnt really hear the noise this morning either, i will check on the way home.

 

[69 Runner]

Check to make sure the crank pulley is bolted down good. I've run in to a pulley making a quasi dry bearing noise before

 

[rp23g7]

Strange, that noise is gone, after changing the oil yesterday. Got home from work, re-timed it and went out to drive it again. No strange noises, weird

 

[musekmkr]

Damn I know this is over a decade old (sorry in advance for resurrecting) but I have the EXACT same issue. Very strange that the noise went away for the OP after an oil change. I got to change mine anyway so we'll see what happens ;)

 

[musekmkr]

I was not so fortunate nor did I expect that changing the oil would make any difference...wishful thinking I guess. Not really sure what the issue is. I'm guessing something with the front trans pump or just something else in the trans. Sounds just like a belt squeal and seems to be non-existent on a cold start until I rev the motor. Then it's there to stay. Very odd...

 

[JG71B]

Dealing with similar. Turned out to be alternator bearings though a fresh rebuild. They rebuilt it again bearings, everything. Were goin 2 for 2. Not happy...the little things!

 

[moparedtn]

Damn I know this is over a decade old (sorry in advance for resurrecting) but I have the EXACT same issue. Very strange that the noise went away for the OP after an oil change. I got to change mine anyway so we'll see what happens ;)

So that's two of ya that let their engines run dry of oil then?
(Yes, I'm kidding...)

 

[musekmkr]

Dealing with similar. Turned out to be alternator bearings though a fresh rebuild. They rebuilt it again bearings, everything. Were goin 2 for 2. Not happy...the little things!

I had just rebuilt my alternator prior to noticing this squeal. Thought I messed something up. I took all belts off just to be sure. It's def not that but certainly sounds just like a belt squeal.