Gringing while turning the Crank question. Need help please

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chevy man - 09 Feb 2008 16:07 GMT

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

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Augustus - 09 Feb 2008 16:25 GMT

> 1992 Silverado, 4.3L Was driving home and the bearings on the
> tensioner pulley broke and the pulley and belt both blew off. I
[quoted text clipped - 11 lines]
> hoping someone can help me figure out what the gringind is. Piston,
> rod, wahtever?

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?

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chevy man - 09 Feb 2008 16:36 GMT

Passenger side, lower left pulley. You are right, it is not the crank
at the very bottom under the water pump.

> > 1992 Silverado, 4.3L Was driving home and the bearings on the
> > tensioner pulley broke and the pulley and belt both blew off. I
[quoted text clipped - 16 lines]
> 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?

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Steve W. - 09 Feb 2008 16:43 GMT

> 1992 Silverado, 4.3L Was driving home and the bearings on the
> tensioner pulley broke and the pulley and belt both blew off. I
[quoted text clipped - 14 lines]
> Thanks
> Aaron

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.

Signature

Steve W.
Near Cooperstown, New York

Life is not like a box of chocolates
it's more like a jar of jalapenos-
what you do today could burn your a.s tomorrow!

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chevy man - 09 Feb 2008 17:08 GMT

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.

Aaron

> > 1992 Silverado, 4.3L Was driving home and the bearings on the
> > tensioner pulley broke and the pulley and belt both blew off. I
[quoted text clipped - 29 lines]
> it's more like a jar of jalapenos-
> what you do today could burn your a.s tomorrow!

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Whitelightning - 10 Feb 2008 07:09 GMT

>> 1992 Silverado, 4.3L Was driving home and the bearings on the
>> tensioner pulley broke and the pulley and belt both blew off. I
[quoted text clipped - 21 lines]
> 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.

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
.

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Steve W. - 10 Feb 2008 18:42 GMT

>>> 1992 Silverado, 4.3L Was driving home and the bearings on the
>>> tensioner pulley broke and the pulley and belt both blew off. I
[quoted text clipped - 39 lines]
> 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.

Signature

Steve W.
Near Cooperstown, New York

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ScottM - 15 Feb 2008 17:34 GMT

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

>>>> 1992 Silverado, 4.3L Was driving home and the bearings on the
>>>> tensioner pulley broke and the pulley and belt both blew off. I
[quoted text clipped - 45 lines]
>
> Sorry for the confusion.

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