Distributor Worn??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70GMC396 · 05-08-2006, 02:22 PM

Jjust by loosening hold down 3/4 turn, timing light is very erratic - does that indicate worn shaft or gear? I have never experienced this much play before while running an engine for timing adjustment. Is this normal amount of play in chevy block when loosened?
Thanks

TugOwar · 05-08-2006, 06:56 PM

Just so we understand,,, You loosen the hold down and that causes the light to freek out? That is what you're saying? I don't see how. 3/4 turn isn't even enough to allow the dizzy to ride up on the gears, or least I don't think so.

Anyway, here's a ttt for you.

kaycee · 05-08-2006, 10:28 PM

Could be, and it wont do it when it is tightened down?If it still does it then more likely the timming chain.

**VetteVet** · 05-08-2006, 11:29 PM

http://www.rustpuppy.org/ignition2/Ignition%202b.htm

Check this website on distributors. It may have the answer for you.

72armyswbtruck · 05-09-2006, 12:21 AM

Rustpuppy

great site

*Billla* · 05-09-2006, 07:20 AM

It's a quick check to pull it - there really shouldn't be any noticeable looseness in the shaft, and no more than (I think) .030 end play.

If the nut is loose enough that the distributor can move up and down then you're going to see timing chains - the gear is helical cut, so it wants to move.

My $.02

70GMC396 · 05-09-2006, 04:48 PM

Thanks for the advice Billla. I'll check it out. Don't have a dial caliper, but can find someone to help measure. Great website Vettevet. And yes, it is fine once tightened down, but still shifts a bit until the very last tightening up. That's what surprised me. I will check for gear and shaft bearing wear next time I can get to the truck (3 weeks).

*Billla* · 05-09-2006, 05:36 PM

Quote:

Originally Posted by 70GMC396

Thanks for the advice Billla. I'll check it out. Don't have a dial caliper, but can find someone to help measure. Great website Vettevet. And yes, it is fine once tightened down, but still shifts a bit until the very last tightening up. That's what surprised me. I will check for gear and shaft bearing wear next time I can get to the truck (3 weeks).

It could be as simple as the holddown bolt being stripped (?) I've always used the ARP stud vs. a bolt.

A feeler gauge will work just fine for end-play; it ain't an exact science

05-08-2006, 02:22 PM	#1
70GMC396 Registered User Join Date: Apr 2006 Location: 93420 Posts: 98	Distributor Worn??? Jjust by loosening hold down 3/4 turn, timing light is very erratic - does that indicate worn shaft or gear? I have never experienced this much play before while running an engine for timing adjustment. Is this normal amount of play in chevy block when loosened? Thanks

05-08-2006, 06:56 PM	#2
TugOwar Registered User Join Date: Sep 2004 Location: Pleasanton, TX Posts: 1,723	Re: Distributor Worn??? Just so we understand,,, You loosen the hold down and that causes the light to freek out? That is what you're saying? I don't see how. 3/4 turn isn't even enough to allow the dizzy to ride up on the gears, or least I don't think so. Anyway, here's a ttt for you.

05-08-2006, 10:28 PM	#3
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,446	Re: Distributor Worn??? Could be, and it wont do it when it is tightened down?If it still does it then more likely the timming chain. __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327

05-08-2006, 11:29 PM	#4
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,717	Re: Distributor Worn??? http://www.rustpuppy.org/ignition2/Ignition%202b.htm Check this website on distributors. It may have the answer for you. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

05-09-2006, 12:21 AM	#5
72armyswbtruck Registered User Join Date: Feb 2004 Location: Idaho Posts: 4,034	Re: Distributor Worn??? Rustpuppy great site __________________ "Remember, They can Kill You, but they can't eat You, That's against the law!!!!!!!!!"

05-09-2006, 07:20 AM	#6
Billla Account Suspended Join Date: Sep 2005 Location: Monroe, WA Posts: 3,815	Re: Distributor Worn??? It's a quick check to pull it - there really shouldn't be any noticeable looseness in the shaft, and no more than (I think) .030 end play. If the nut is loose enough that the distributor can move up and down then you're going to see timing chains - the gear is helical cut, so it wants to move. My $.02

05-09-2006, 04:48 PM	#7
70GMC396 Registered User Join Date: Apr 2006 Location: 93420 Posts: 98	Re: Distributor Worn??? Thanks for the advice Billla. I'll check it out. Don't have a dial caliper, but can find someone to help measure. Great website Vettevet. And yes, it is fine once tightened down, but still shifts a bit until the very last tightening up. That's what surprised me. I will check for gear and shaft bearing wear next time I can get to the truck (3 weeks).



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