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Old 06-28-2004, 08:57 AM
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Unfunny Noises

Car is a '70 Cutlass with a stock 350, q-jet, dual exhaust, TH350 tranny. The engine top end was done about 20K ago. Trans has about 40K on it, with a filter chnage about 20K ago. All was well with the world until last week when I was driving a city street and suddenly I hear a shrieking/grinding that would make your hair stand on end!! Sounded like the fan grinding into something, so I pull over and shut down.

Upon inspection under the hood no obvious trouble could been seen-maybe the clutch fan is a little loose. So I start up again and before I can get out to look, the sound happens and the engine dies- this car never just dies. Now that can't be good I think to myself. I try to restart and...... no problem. I rev gently a couple of times and think "Time to go home, NOW". On the way home this noise happened only slightly a couple of times.

So I changed out the fan clutch with a spare that I had. This makes no difference-the source is not the fan. In the driveway I can reproduce the sound by revving the engine in Park, and in gear if I load it. It is intermittant and the duration is no more than a second

I dropped the inspection cover under the torque converter. No loose bolts there, and the starter is solid and works normally. This shieking/grinding is definitely from something rotating into something, and sometimes seems to cause a miss or stumble. The engine runs normally otherwise and the trans shifts normally. Can a torque converter with a broken vane do this? Could it stall the engine? I really could use some ideas here. Thanks-Steve

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Old 06-28-2004, 10:32 AM
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Try an alternator bearing.
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Old 06-28-2004, 04:29 PM
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Like others would say, Disconnect the converter and start her up. Listen for the sound.If no sound then your looking at trans.My friend had a B&M conv. and it started to make a similar type of sound.After about 2-3 days later , he was crusing the car ,came to a stop sign and then the car stalled .After pushing it for about a 1/2 block,It fired up but, he was going no where fast.5000rpm at 20mph if that.You smelt the trans burning up, but it was actually the converter.(found out for sure after removing and shaking it. All you heard was like a 100 razerblades in a can sound)--- JMT
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Old 06-28-2004, 11:42 PM
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Noises....That go bump in the night...

[color=lightblue]Doc here,

Do the easy stuff first, Sounds like maybe an Alternator Bearing as Bob Said, or Possibly An air-conditioning Fan Clutch locking up on a Low compressor...A Water Pump Bearing going out, Smog pump headed for vacation...

Remove the belts one at a time and try to reproduce the noise (Sounds like it's pretty reproducible) See if it goes away, if not, then go on...

Doc
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Old 06-29-2004, 12:38 PM
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Well, I couldn't get the idea out of my head that the sound was like that of the starter engaging the flywheel with the engine running, so I started it up, and just for an instant, I turned the key to the start position. Sure enough it made tha same noise.

So I dropped the starter (easier to do that I thought than dropping the trans) and found the trouble. One of the small bolts holding the solenoid together had backed out and was intermittently bridging the switch wire and the battery cable causing the starter to engage.

Don't you just love it when the stars align and the fix is logical, easy and cheap? Well sort of cheap. I am having the starter rebuilt by a local electrical shop who is going to convert it to a high torque unit.

Thanks guys.
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Old 06-29-2004, 01:51 PM
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Easy Fix

[color=lightblue]Doc here:

Good Job guy!

Don'tja Just love it when a plan Comes together!

Doc

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Old 06-29-2004, 03:07 PM
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HEY STEVE: Thanks for posting " The Rest of Story" a lot of members ask all the questions and never post how they solved the problem. When that happens it makes this site not so helpful. Glad you found the simple solution.....DAVE
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