Gringing while turning the Crank question. Need help please

1992 Silverado, 4.3L Was driving home and the bearings on the tensioner pulley broke and the pulley and belt both blew off. I coasted to the exit and into a gas station. Opened the hood and saw the pulley and belt missing. Truck was not yet overheated, thank goodness. I replaced the pulley and belt and started right up but the grinding and rattling noise was there as if something was banging around inside the engine. There is no water in the oil so it does not appear to be a head gasket. I removed the belt and turned the water pump, and no noise there. I checked alternator and there was a bit aof grinding but nothing major. I then got to the cranks( I think that is what they are) and the right side made no noise as I turned it, but the left one was grinding and rattling when I turned it by hand. What does this mean? By the way the enging has 220,000 miles on it. I am hoping someone can help me figure out what the gringind is. Piston, rod, wahtever?

Thanks Aaron

Reply to
chevy man
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1992 Silverado, 4.3L Was driving home and the bearings on the tensioner pulley broke and the pulley and belt both blew off. I coasted to the exit and into a gas station. Opened the hood and saw the pulley and belt missing. Truck was not yet overheated, thank goodness. I replaced the pulley and belt and started right up but the grinding and rattling noise was there as if something was banging around inside the engine. There is no water in the oil so it does not appear to be a head gasket. I removed the belt and turned the water pump, and no noise there. I checked alternator and there was a bit aof grinding but nothing major. I then got to the cranks( I think that is what they are) and the right side made no noise as I turned it, but the left one was grinding and rattling when I turned it by hand. What does this mean? By the way the enging has 220,000 miles on it. I am hoping someone can help me figure out what the gringind is. Piston, rod, wahtever?

Thanks Aaron

Reply to
chevy man

It's not the crankshaft pulley. That's the one under the water pump. You won't be turning it by hand unless the engine's out of the vehicle with the heads off. It's likely the power steering or the a/c compressor. When you say right and left which side do you mean passenger and drivers side?

Reply to
Augustus

Reply to
chevy man

Well if I understand you correctly I would say the A/C Clutch bearing seized up and that destroyed the tensioner. The bearing can be replaced without breaking the A/C system.

The crankshaft pulley is at the bottom of the engine. Directly above it is the water pump. You won't be turning it by hand unless your king kong.

Reply to
Steve W.

King Kong I am not for sure. How can I replace the bearing without breaking the A/C system. I have somewhat mechanically inclined but no mechanic. I have tools and can follow directions well. Never worked on a an A/C system or Compressor. Thanks for your help by the way, I could use all I can get.

Aar> chevy man wrote:

Reply to
chevy man

I am confused. The AC compressor is at the top passenger side, under it is an idler pulley, below that is nothing MOST of the time.. Next to the idler pulley is the water pump, to the left of the water pump is the power steering pump. and off course below the water pump is the crank pulley. The power sterering pump, Ac compressor, Alt, and crank pulley will have grooves. The Idler pulleys andthe tensioner pulley will be smooth. Now then the MOST comment is because some engines had an air pump on the lower right side ie passenger side and it has a grooved pulley as well. So the pulley you are turning that makes a grinding sound is it smooth or grooved? I think he has a bad idler puley because he says lower left. Unless he has an air pump.

Whitelightning .

Reply to
Whitelightning

Now that I think about it his 92 would have the old style layout. It may have an air pump.

Sorry for the confusion.

Reply to
Steve W.

if it is the air pump, it would make noise even if it were in good shape.

Reply to
ScottM

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