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tamecrow

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Discussion starter · #1 ·
I was standing at the rear of my idling '90 GMC 6.2 today, when all of a sudden a very loud grinding (metal on metal) noise came from the engine area. No knocking, only the grinding noise. I ran and shut it down, but didn't notice if it had oil pressure. I checked the oil which was full and tried to start it, and it cranked over like it had a low battery. I only tried it once and had it towed home. Any thoughts??
 
Discussion starter · #3 ·
you sure the tranny did'nt seize up?
Thanks for the reply. It's an automatic. I drove it into a service station to put air in a leaking rear tire and all of a sudden it sounded like two rotating rims being meshed together. I checked all the accessories to see if it was the alternator or A/C compressor, but they seem fine.
 
Discussion starter · #7 ·
Also check for play at the waterpump and/or take the belt of to rule out all accesories before start.Maybe should do that first.
I did that before I tried to restart the engine. I'm leaning toward this being a spun bearing. The engine ran fine, then this awful grinding noise, and now when I try to start it, something is stopping the engine from turning over smothly. It's acts like a very low battery when trying to crank it over. I will probably pull the engine and pan and have a look.
Anyone agree with the spun bearing therory?
 
Discussion starter · #12 ·
Thanks for the suggestions! I'll unbolt the torque converter to isolate the problem. I have a busy week but should be able to get at it some evening. I will report my findings as soon as I find the problem.
 
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