Has any of you guys seen a fan explode? Like totally disintegrate? I had never seen it until yesterday.
Took my truck to get it weighed, turned onto a state highway off of a county road and goosed it a bit. It was spinning a little on the 2-3 shift but the governor is set to shift at 5,500 and the rev limiter is set at 6,000. It didn't hit the limiter. Loudest bang I've ever heard, shrapnel and smoke everywhere. I thought at first the engine had let go but that wouldn't explain the holes in the hood. Plus it was idling just fine and the oil pressure was good.
I couldn't pull to the side of the road because there's no shoulder and a ditch at the edge of the road. It's a really busy two-lane so blocking it isn't an option but there's a spot I can get across the ditch about a half mile up the road. The smoke trail is unbelievable and I knew there's was no water in it because the windshield was covered in it so I shut it off and coasted. I had plenty of momentum to make it to where I needed to be, though. Too much momentum it turns out because when I got there I hit the brakes and nothing happened. No brakes. I made the turn but before I could get on the parking brake I ran through a fence. Punched a hole through the passenger fender and left a pretty good scrape down the side.
What a freaking ride.
I get myself composed and check the damage. The fan is gone. Not a trace. The clutch is there and seemingly unhurt, as are the bolts that attached the fan. All four of them. But not any proof that a fan had been bolted there....WTF???
When the fan came apart it of course took out the shroud and hoses but it also took out the transmission cooler lines, explaining all the smoke. The brake proportioning valve sits on a crossmember directly under the radiator and it wiped that out too. I guess I should feel lucky it didn't take out a front tire.
The only proof I have that the fan ever existed is the damage it left behind. I've never seen anything like it.
It was a brand new Derale fan. 18Ē reverse rotation, rated to 8,000 RPM. I'll be calling them in the morning. It caused an easy couple thousand dollars damage and damn near killed me. I know it was tight and the clutch was fine because I had checked them right before I left because the water pump is seeping a little out of the weep hole and I grabbed the fan to check the bearings. All good at that point. 5 miles later...not so much.
Less than a thousand miles on the engine, fan, GM serpentine setup.
69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt
76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
Last edited by Tommy the Cat; Oct 13th, 19 at 2:03 PM.