My baby started bleeding this weekend - The 1947 - Present Chevrolet & GMC Truck Message Board Network

forestb · 07-22-2019, 12:48 PM

My baby started bleeding this weekend. I was on the freeway and my crankshaft pulley completely sheared off and cut open my lower radiator hose. I have no idea what caused it all the bolts are tightened down to the piece of the pulley that is still attached to be balancer.

MikeN · 07-22-2019, 05:29 PM

I had that happen once on a 350, the hub of the harmonic balancer was cracked and the balancer flew off the end of the crankshaft while I was driving down the road. I would guess your pulley had a crack, either from old age or use, or possible improper installation.

**Steeveedee** · 07-22-2019, 10:13 PM

Bummer!

50+ year old pulley. No telling what happened to it over the years.

**Captainfab** · 07-22-2019, 11:02 PM

So if I am understanding correctly, the crank pulley came apart? Had you noticed any vibration prior to this happening?

kens65fb · 07-23-2019, 07:58 AM

Quote:

Originally Posted by forestb

My baby started bleeding this weekend. I was on the freeway and my crankshaft pulley completely sheared off and cut open my lower radiator hose. I have no idea what caused it all the bolts are tightened down to the piece of the pulley that is still attached to be balancer.

Maybe the pulley broke

forestb · 07-23-2019, 01:10 PM

Quote:

Originally Posted by Captainfab

So if I am understanding correctly, the crank pulley came apart? Had you noticed any vibration prior to this happening?

correct. I had not noticed any vibration. But it was making a little squeaking sound mostly when first starting it up. I don't know how old the pulley is it's a 350 that I don't know the age of.

**Captainfab** · 07-23-2019, 11:23 PM

I haven't seen a pulley come apart like that before. It must have been damaged or cracked and you just did not see it. All I can say is just replace the pulley with a new one and keep an eye on it for a bit.

forestb · 07-24-2019, 11:29 AM

I took it to the mechanic yesterday because I wanted him to diagnose the cause and not just fix the problem. He said that the rod for the water pump pulley also go bent in the process. The water pump is less than a year old. he also said it put a dent in my radiator but it is not leaking. the crankshaft pulley might have been cracked.

rvrfoot · 07-26-2019, 07:33 PM

Do you have pictures?

forestb · 07-26-2019, 11:35 PM

No I don’t. I got it back today and all seams well. New water pump and 2 new Mr gasket pulleys. They also made me some new trans cooler lines The old ones were leaking and
About a half inch away from my headers.

07-22-2019, 12:48 PM	#1
forestb Registered User Join Date: Jan 2009 Location: Burbank, CA Posts: 3,619	My baby started bleeding this weekend My baby started bleeding this weekend. I was on the freeway and my crankshaft pulley completely sheared off and cut open my lower radiator hose. I have no idea what caused it all the bolts are tightened down to the piece of the pulley that is still attached to be balancer.

07-22-2019, 05:29 PM	#2
MikeN Registered User Join Date: Oct 2007 Location: Marietta, GA Posts: 805	Re: My baby started bleeding this weekend I had that happen once on a 350, the hub of the harmonic balancer was cracked and the balancer flew off the end of the crankshaft while I was driving down the road. I would guess your pulley had a crack, either from old age or use, or possible improper installation.

07-22-2019, 10:13 PM	#3
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,708	Re: My baby started bleeding this weekend Bummer! 50+ year old pulley. No telling what happened to it over the years. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

07-22-2019, 11:02 PM	#4
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: My baby started bleeding this weekend So if I am understanding correctly, the crank pulley came apart? Had you noticed any vibration prior to this happening? __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

07-23-2019, 11:23 PM	#7
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: My baby started bleeding this weekend I haven't seen a pulley come apart like that before. It must have been damaged or cracked and you just did not see it. All I can say is just replace the pulley with a new one and keep an eye on it for a bit. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

07-24-2019, 11:29 AM	#8
forestb Registered User Join Date: Jan 2009 Location: Burbank, CA Posts: 3,619	Re: My baby started bleeding this weekend I took it to the mechanic yesterday because I wanted him to diagnose the cause and not just fix the problem. He said that the rod for the water pump pulley also go bent in the process. The water pump is less than a year old. he also said it put a dent in my radiator but it is not leaking. the crankshaft pulley might have been cracked.

07-26-2019, 07:33 PM	#9
rvrfoot Registered User Join Date: Oct 2016 Location: san bernardino ca Posts: 1,611	Re: My baby started bleeding this weekend Do you have pictures?

07-26-2019, 11:35 PM	#10
forestb Registered User Join Date: Jan 2009 Location: Burbank, CA Posts: 3,619	Re: My baby started bleeding this weekend No I don’t. I got it back today and all seams well. New water pump and 2 new Mr gasket pulleys. They also made me some new trans cooler lines The old ones were leaking and About a half inch away from my headers.



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