Disintegrated fan pulley 1967 427

[Steven L.]

Last week I asked if a repair might have had something to do with a fan pulley exploding. It seems that this was just a case of bad luck. I had my oil pan gasket and intake manifold gasket replaced due to leaking oil. 10 minutes after leaving the shop, this is what happened to my fan pulley. The piece on the top left lodged itself into the hood, coming through the other side at the front of the scoop. The car is at the body shop this week for repair.

Thanks to those who replied letting me know the mechanic did nothing to cause this. The photo is prior to the incident.

[Joe L.]

Re: Disintegrated fan pulley 1967 427

Last week I asked if a repair might have had something to do with a fan pulley exploding. It seems that this was just a case of bad luck. I had my oil pan gasket and intake manifold gasket replaced due to leaking oil. 10 minutes after leaving the shop, this is what happened to my fan pulley. The piece on the top left lodged itself into the hood, coming through the other side at the front of the scoop. The car is at the body shop this week for repair.

Thanks to those who replied letting me know the mechanic did nothing to cause this. The photo is prior to the incident.

Steve------


I have NEVER seen or heard of a pulley "disintegrating" like this. It does appear, though, that this pulley suffered from some corrosion damage which may or may not have been "painted over".

[Steven L.]

Re: Disintegrated fan pulley 1967 427

Steve------


I have NEVER seen or heard of a pulley "disintegrating" like this. It does appear, though, that this pulley suffered from some corrosion damage which may or may not have been "painted over".

Joe, the mechanic that did the gaskets has worked only on Corvettes for 42 years and said the exact same thing. Also, not the kind of thing you ever want to hear from your doctor. (I've never seen anything like THAT before)

[Domenic T.]

Re: Disintegrated fan pulley 1967 427

I had the same thing happen to a fan pulley that was on a 235 6 cylinder engine.
I contribute it to metal fatigue over the years caused by flex. Oil canning was a term used, and after time the metal gets brittle.
That pic brought back bad memories as it stranded the whole family in the desert. Drove for a mile then stopped and let cool, until I found a ranch with a welder.

Dom

[Steven L.]

Re: Disintegrated fan pulley 1967 427

I had the same thing happen to a fan pulley that was on a 235 6 cylinder engine.
I contribute it to metal fatigue over the years caused by flex. Oil canning was a term used, and after time the metal gets brittle.
That pic brought back bad memories as it stranded the whole family in the desert. Drove for a mile then stopped and let cool, until I found a ranch with a welder.

Dom

Sorry for the bad memories. At least I was only 10 miles from the mechanic and waited an hour for a tow.

Steve

[Joe L.]

Re: Disintegrated fan pulley 1967 427

I had the same thing happen to a fan pulley that was on a 235 6 cylinder engine.
I contribute it to metal fatigue over the years caused by flex. Oil canning was a term used, and after time the metal gets brittle.
That pic brought back bad memories as it stranded the whole family in the desert. Drove for a mile then stopped and let cool, until I found a ranch with a welder.

Dom

Dom-----


I don't know how a pulley in the condition of the one shown above could be weld-repaired even for a very temporary repair.

[Joe L.]

Re: Disintegrated fan pulley 1967 427

Sorry for the bad memories. At least I was only 10 miles from the mechanic and waited an hour for a tow.

Steve

Steve------


Does this car have C-60? Also, can you see any portion of a GM part number on the fragments?

[Steven L.]

Re: Disintegrated fan pulley 1967 427

Yes it does have C-60, and the only marking I can find is the letter S on the back of the pulley. I don't know if the missing fragment might have had a number on it.

[Gary J.]

Re: Disintegrated fan pulley 1967 427

The reproduction 3 groove pulley is made out of Aluminum now, not correct for judging.

[Steven L.]

Re: Disintegrated fan pulley 1967 427

I'm okay with that, as long as it doesn't explode

[Ronald L.]

Re: Disintegrated fan pulley 1967 427

With all the loading on a very small surface area, a three groove pulley - well - you certainly would not want to over tighten the belts. Over tightened belts would definitely cause fatigue failure.
Joe - is the part number 3995644BF? Should be also shown in the 67 AIM under the C60 pages.

[Joe L.]

Re: Disintegrated fan pulley 1967 427

With all the loading on a very small surface area, a three groove pulley - well - you certainly would not want to over tighten the belts. Over tightened belts would definitely cause fatigue failure.
Joe - is the part number 3995644BF? Should be also shown in the 67 AIM under the C60 pages.

Ronald------


The original pulley for the 1967 big block with A/C was GM #3889372. That pulley was discontinued from SERVICE in June, 1971 and replaced by GM #3995644.

[Joe L.]

Re: Disintegrated fan pulley 1967 427

Yes it does have C-60, and the only marking I can find is the letter S on the back of the pulley. I don't know if the missing fragment might have had a number on it.

Steven------

The "S" manufacturer's ID is commonly found on original GM pulleys of the period. The original pulley was GM #3889372.

[Joe L.]

Re: Disintegrated fan pulley 1967 427

The reproduction 3 groove pulley is made out of Aluminum now, not correct for judging.

Gary------


Personally, I'd be very leery of using a stamped aluminum reproduction pulley. A machined aluminum pulley would be OK but, of course, its configuration would be totally non-original.

[Dick W.]

Re: Disintegrated fan pulley 1967 427

Gary------


Personally, I'd be very leery of using a stamped aluminum reproduction pulley. A machined aluminum pulley would be OK but, of course, its configuration would be totally non-original.

I don't understand how they could stamp an aluminum pulley. The pulley would require deep draw dies and I don't think aluminum would not crack or break during the process. Long Island Corvette has the 3 grove w/AC pulley for $215.00