any 250 six cylinder experts here? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

squidbilly · 12-24-2007, 11:45 AM

The 250 six in my son's '81 SWB Custom Deluxe has a weird pully thing going on. The bottom pulley on the engine (running off the crank) is a three grooved pulley.

The back two grooves are wobbly and loose while the front groove is still set solidly in place.......?

What the heck is the deal and how can I fix it?

(I'm fairly mechanically inclined but have no experience with Chevy sixes).

tyjoja · 12-24-2007, 11:57 AM

I'm not sure exactly,but when I see six cyl. I perk up cause my 73 has one, I'd have to look to see how many grooves mine has. I thought these pulleys would be all one piece, but if not maybe the first two didn't get seated all the way back. If it is all one piece then the machining would have to be faulty. good luck bob

Shamil · 12-25-2007, 12:22 AM

Check bellow link; they are expert in Inline engines

http://www.inliners.org

dswancutt · 12-25-2007, 01:14 AM

If I remember correctly when I pulled mine out of my 79, I think it is a 2 piece pulley. I would check to see if the bolts are loose.

squidbilly · 12-27-2007, 02:42 PM

Guys, thanks! Long story short, the harmonic balancer had fallen apart and I had to replace it. The parts houses don't stock them so I wound going to a salvage yard and spent three hours yanking one off an '84 - cost me a whopping $10

.

You can get thm at the parts houses but they gotta order 'em.

LBJ · 12-27-2007, 05:46 PM

I agree with the harmonic balancer as the culprit. I had a 1976 Chevy Nova with a 6/250 that ran like stink! Had the same thing happen. Oh, see you got it fixed. LBJ

12-24-2007, 11:45 AM	#1
squidbilly Registered User Join Date: Dec 2007 Location: Acme,Oklahoma Posts: 15	any 250 six cylinder experts here? The 250 six in my son's '81 SWB Custom Deluxe has a weird pully thing going on. The bottom pulley on the engine (running off the crank) is a three grooved pulley. The back two grooves are wobbly and loose while the front groove is still set solidly in place.......? What the heck is the deal and how can I fix it? (I'm fairly mechanically inclined but have no experience with Chevy sixes). __________________ 1981 Custom Deluxe with 250 six cylinder, automatic, factory block-off plugs for dome light switches and cigarette lighter. Allow me to explain the contamination process. Pine cones go in here, party liquors comes out here and proceed to here. *10 reasons ~NOT~* to vote for Ron Paul**

12-24-2007, 11:57 AM	#2
tyjoja Registered User Join Date: Jan 2007 Location: albany oregon Posts: 168	Re: any 250 six cylinder experts here? I'm not sure exactly,but when I see six cyl. I perk up cause my 73 has one, I'd have to look to see how many grooves mine has. I thought these pulleys would be all one piece, but if not maybe the first two didn't get seated all the way back. If it is all one piece then the machining would have to be faulty. good luck bob Last edited by tyjoja; 12-24-2007 at 11:57 AM.

12-25-2007, 12:22 AM	#3
Shamil Registered User Join Date: Nov 2006 Location: Amman, Jordan Posts: 121	Re: any 250 six cylinder experts here? Check bellow link; they are expert in Inline engines http://www.inliners.org

12-25-2007, 01:14 AM	#4
dswancutt Registered User Join Date: Jul 2003 Location: Franklin, NE Posts: 387	Re: any 250 six cylinder experts here? If I remember correctly when I pulled mine out of my 79, I think it is a 2 piece pulley. I would check to see if the bolts are loose.

12-27-2007, 02:42 PM	#5
squidbilly Registered User Join Date: Dec 2007 Location: Acme,Oklahoma Posts: 15	Re: any 250 six cylinder experts here? Guys, thanks! Long story short, the harmonic balancer had fallen apart and I had to replace it. The parts houses don't stock them so I wound going to a salvage yard and spent three hours yanking one off an '84 - cost me a whopping $10 . You *can* get thm at the parts houses but they gotta *order* 'em. __________________ 1981 Custom Deluxe with 250 six cylinder, automatic, factory block-off plugs for dome light switches and cigarette lighter. Allow me to explain the contamination process. Pine cones go in here, party liquors comes out here and proceed to here. *10 reasons ~NOT~* to vote for Ron Paul**

12-27-2007, 05:46 PM	#6
LBJ Registered User Join Date: Jun 2007 Location: TEXAS Posts: 378	Re: any 250 six cylinder experts here? I agree with the harmonic balancer as the culprit. I had a 1976 Chevy Nova with a 6/250 that ran like stink! Had the same thing happen. Oh, see you got it fixed. LBJ Last edited by LBJ; 12-27-2007 at 05:47 PM.



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