stevemedcroft
01-05-2008, 14:34
Hi guys.
I recently inherited an 82 GMC 6.2 that was in pretty bad shape. It ran but I had to do a few engine repairs to clean up the previous owner's left-behind mistakes. Repair one was to replace the coolant crossover pipe (thanks Robyn). Repair two was to purchase and install the bracket that supports the alternator pivot bolt (the long bolt at the bottom of the alternator had snapped at the block too so there was some removing and tapping in there as well).
Anyway, I just finished putting it all back together. Since I have no practical experience with the way this truck should run (I have not yet lived with whatever its quirky little noises and movements are), I have a question about the way the crankshaft pulley is moving and its effect on the alternator belt.
When running (mind you, the first time its run in 45 days with whatever fuel and fuel filter conditions were there when I got it), the crankshaft pulley has a slight wobble to it - maybe 1/16 to 1/8 of an inch in when spinning. The wobble creates a whipping see-saw in the lower part of the alternator belt which in turn is making a low whoop-whoop-whoop sound.
Is this pretty normal? Is it something I need to address at the cranksahft pulley or alternator adjustment. Is this (gulp) signs of the lower pulley problems I have been hearing about?
Thanks in advance,
Steve M.
I recently inherited an 82 GMC 6.2 that was in pretty bad shape. It ran but I had to do a few engine repairs to clean up the previous owner's left-behind mistakes. Repair one was to replace the coolant crossover pipe (thanks Robyn). Repair two was to purchase and install the bracket that supports the alternator pivot bolt (the long bolt at the bottom of the alternator had snapped at the block too so there was some removing and tapping in there as well).
Anyway, I just finished putting it all back together. Since I have no practical experience with the way this truck should run (I have not yet lived with whatever its quirky little noises and movements are), I have a question about the way the crankshaft pulley is moving and its effect on the alternator belt.
When running (mind you, the first time its run in 45 days with whatever fuel and fuel filter conditions were there when I got it), the crankshaft pulley has a slight wobble to it - maybe 1/16 to 1/8 of an inch in when spinning. The wobble creates a whipping see-saw in the lower part of the alternator belt which in turn is making a low whoop-whoop-whoop sound.
Is this pretty normal? Is it something I need to address at the cranksahft pulley or alternator adjustment. Is this (gulp) signs of the lower pulley problems I have been hearing about?
Thanks in advance,
Steve M.