What!? You're looking for a diagnosis over the internet?
Yip! On account of it's free and I'm a tightar$e
[i]Has the waterpump ever been rebuilt or replaced? Also might want to check the alignment of the belt between the waterpump and the alternator. The fact that it's squealing tells me that it could quite possibly be loose. Its been said that the waterpump belt must be torqued super tight in order for it to be properly installed.
There's no mention of anything done to the pump in the service history records I have, no. Alignment-wise, the pulleys are all fine. The belt only squeals in the 30 seconds before failing- that's what's making me think that the water pump is suddenly seizing and the belt's squealing and melting as it's being dragged over the suddenly-stationary pulley.
Not sure if your QV is similar to my 78 but here goes. I had same problem, flimsy little belt turned to melted snot (think that's the technical term). Checked out alternator and water pump, and tightness/ alignment of all- nothing. Thought "maybe too much heat". Built a heat shield at frame, over the front bank exhaust and no more problem. There is a heat shield at this point that shields the alternator but not long enough to help belts. I suspect mine needed this extra shield due to Tubi exhaust that was installed prior to me. If you'd like I can try to send pictures, but very simple shield-I used a scrap of stainless 20 gauge that is about 8" long, broke it @ 90 degree so some 2" down and 4" over and overlaps existing shield. Put a pop rivet in it of I've had no trouble since- belt still looks new. Hope this helps, Bill
Ah good, 'Melted snot' is my kinda terminology!
I'll have a look and see if my belts are sitting over unshielded exhaust pipe. Anything that stops me having to take off the pump sounds good to me.
Out of curiosity, can you remember if your belt squealed for a minute just prior to failing?
Thank you both for your help!
Oh PS I would like to tell the world that the 308 has, without doubt, the stupidest fanbelts I have ever seen in my life. Why did they make them so thin?? I'd expect to see this kind of thing on a Tonka toy, not an actual CAR, and certainly not on a FANCY car! There, I've said it. I feel so much better now...