engine squealing

[Dave Russell]

I agree with usasma, & Aerog,

I think your car originally had a smog (air injection) pump. It is fairly common for the pump to bind up which requires the belt to slip on the pulley. Makes a lot of smoke & noise. The only permanent fix is to replace or remove the pump.
D

 

[Guitardemon]

The smog pump was removed and it turns freely with no binding or resistance. What else could make this noise?

 

[Guinn]

Possible broken piston ring? Had one do that years ago. The noise goes away but you end up with a bad cylinder.

Guinn

 

[Dave Russell]

[ QUOTE ]
The smog pump was removed and it turns freely with no binding or resistance. What else could make this noise?

[/ QUOTE ]
Sometimes they only bind up when they get hot. Other possibilities are a water pump bearing or a alternator bearing. A piston ring would not cause a belt slip, burnt rubber situation. If you run it long enough the culprit will become obvious.
D

 

[Guitardemon]

I have a 1974 mg and some part of the engine seems to be making a sort of squealing noise. The noise seems to come and go, but yesterday it was really squealing and at one point I could smell some burning rubber. Does any one have any clue as to what could be creating this problem and how can I fix it?

 

[usasma]

Could it be the smog pump (or whatever 74's have for pollution control)? I had the same thing on my 68 many years ago. My GT was desmogged before I got it.

 

[aerog]

Not to be overly simplistic about this but - it couldn't be the belt slipping wildly could it?

 

[Guinn]

Heh, that car that had the squealing, broken ring smoked and stank so bad that burning rubber would have been a blessing! Actually, it was many years in the past and I junked the car out. Didn't know diddly about cars at that time. Not sure I know much more now.

 

[Kimberly]

Check the belts. If they're glazed, dry and/or cracked, you've found the problem.

 

[Bruce Bowker]

99% of squealing is from v-belts. Replace or tighten.

Bruce

 

[Dave Russell]

Yeah,
But belts that squeal because they are loose don't usually burn rubber. They can't get enough traction to burn much rubber. They just glaze. A reasonably tight belt trying to turn an impossible load, will burn & squeal.
D

 

[maynard]

Another possibility is the harmonic balancer. As it ages, the rubber hardens and can seperate. Easy to test, take a piece of chalk and draw a line across all three pieces. Start the engine and after hearing the squeal see if the line is still in tact.

 

[Bruce74B]

It could be a water pump...if so, it will start leaking soon! If it is binding, it may cause the belt to slip and burn some too. But the slipping hose is likely the culprit.

Bruce