Help! - \'75 Blazer (350CID) belts keep coming off
OK, I've seen plenty of posts where someone is yelling 'Heeeeeeeeeeeelp' with some problem or other. Now I guess I've reached that point too! I've owned a '75 Blazer with a 350/350 engine/tranny combination for about three years now that ran like a champ for the first 2 1/2 years. Took it on a couple of week long vacations where we covered over 2000 mi each time and drive it as a daily driver. Then all of the sudden it started tossing the belts last fall. Sometimes 2 months between happening, this last time a week and a half. This is the forth time in six months.
I believe it is either the alternator or the power steering pump belt that starts the problem because I left the A/C belt off for awhile through the winter and it still happened. I've aligned the pulleys on both alternator and power steering pump as close as I can see how. I switched to Gates belts which I'm told are the best. I don't see any visible problems with any of the pulleys, although maybe I don't know what to look for that's not so obvious. Can't see anything wobbling at any RPM, at least under no load. Fan clutch seems to work the way it's supposed to.
I think I'm to the point of just starting to replace stuff to see if the problem goes away. But even then, not sure just what to start with - water pump pulley, crankshaft pulley, alternator, power steering pump, etc. I've also had suggestions that it could be the harmonic balancer. I've been told that the small block Chevy has had this problem since it's early days, to the point where there are supposedly aftermarket flat belt replacement set-ups to eliminate the V belts completely. That seems like an extreme solution, but I'm getting to the point of considering something like that!
Anyone else had this kind of trouble?
Footin' it again.