Very odd problem Fan clutch?

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michaelangelo - 27 Mar 2006 20:45 GMT

Have a very weird problem. Have a 97 1500 with a 5.9L motor. Given
me 130k with absolutely no problems. Truck looks and runs like new so
I'd like to keep it. But I've developed a strange problem. Heard loud
bangs from the engine at an inconsistent rate. Maybe 4 or 5 per minute
then nothing for 30 seconds then 5 or 6 times in a row then silence
for a while then bang bang again. while checking it out I saw the
tension idler was the culprit. changed the idler and belt and checked
all the pulleys and they were fine. Started it up and there she goes
again. almost like something is trying to stop the engine. Rechecked
all the pulleys and all and everything seems OK. Anyone seen this.
Like to do my own wrenching but don't know where to start. Find me the
problem and the beer is on me.

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Max Dodge - 27 Mar 2006 22:38 GMT

Check bearings in AC compressor clutch, water pump and PS pump, assuming you
feel the problem is related to the belt.

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Max

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> Have a very weird problem. Have a 97 1500 with a 5.9L motor. Given
> me 130k with absolutely no problems. Truck looks and runs like new so
[quoted text clipped - 8 lines]
> Like to do my own wrenching but don't know where to start. Find me the
> problem and the beer is on me.

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SnoMan - 27 Mar 2006 23:56 GMT

>Check bearings in AC compressor clutch, water pump and PS pump, assuming you
>feel the problem is related to the belt.

I agree since it seems that it is coming from front of engine. Check
for smooth operation/drag on clutch fan too and that there is no play
in its hubs assembly.

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MMC - 01 Apr 2006 19:34 GMT

I use a poor mans stethescope to listen to components. Take a piece of
dowell or a broom stick, cut to 3 feet, place end on component and thumb on
other end of stick, place ear on first knuckle of thumb.
Problem component will make a lot more noise than others!
MMC

> Check bearings in AC compressor clutch, water pump and PS pump, assuming you
> feel the problem is related to the belt.
[quoted text clipped - 11 lines]
> > Like to do my own wrenching but don't know where to start. Find me the
> > problem and the beer is on me.

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TBone - 27 Mar 2006 23:05 GMT

Does it do it right from start-up or after a while. If it happens right
from start up, I would remove the belt and see what happens. If it stops
doing it, then it is probably one of the external belt driven components, AC
compressor, water pump, power steering or alternator. If it continues, you
may have an internal problem but check the starter motor and make sure it is
not coming loose and listen to the bell housing to check for a possible
converter problem.

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Xclimation - 31 Mar 2006 06:24 GMT

Just shooting in the dark for the beer, but how about the timing chain?

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