C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

up and down play in dist shaft...

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Old Dec 7, 2003 | 06:42 AM
  #1  
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Default up and down play in dist shaft...

as topic says, is it normal, to have about .050 up and down play in the dist shaft??

if not, whats wrong, how can it be corrected?

thank you
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Old Dec 7, 2003 | 07:00 AM
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Default Re: up and down play in dist shaft... (corvette90)

Maybe your "C-bar" has worked loose, see if you can tighten those 4 bolts, the ones on top are alittle tricky, try using a stuby open end????
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Old Dec 7, 2003 | 09:38 AM
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Default Re: up and down play in dist shaft... (edsalinas)

forgive me, but what is the C-bar??

thanks
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Old Dec 7, 2003 | 09:48 AM
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Default Re: up and down play in dist shaft... (corvette90)

Sorry, that's a nickname for it. It's the torque bar that connects the rear of the tranny to the front of the differential.
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Old Dec 7, 2003 | 10:00 AM
  #5  
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Default Re: up and down play in dist shaft... (edsalinas)

oh..i think i have to clear something...

i dont mean something related to the c-beam, i meant, the electronic distributor, ignition...

i have my distributor out and noticed an up and down play in the distributor drive shaft...

that was what i meant :cheers: :)
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Old Dec 7, 2003 | 10:03 AM
  #6  
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Default Re: up and down play in dist shaft... (corvette90)

Opps, that was my fault "up and down play in dist shaft... (corvette90)"

:leaving:
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Old Dec 7, 2003 | 11:19 AM
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Default Re: up and down play in dist shaft... (corvette90)

Yes there should be some up and down slop in a dist.
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Old Dec 7, 2003 | 12:35 PM
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Default Re: up and down play in dist shaft... (corvette90)

as topic says, is it normal, to have about .050 up and down play in the dist shaft??
Yes. That is normal. But that doesn't mean it can't be fixed. My Helms manual shows the disassembly of the distributor, but gives no specs for clearences, including end play. *I* feel .006 - .010 is plenty. When that shaft moves up and down, the gear that is pinned to it moves up and down, also. The teeth on that gear are helical. That means when the shaft moves, the gear turns and changes the ignition timing. There are distributor shim kits available in the aftermarket. Mr. Gasket sells one, I think. I don't care how much that shim kit costs (should be under $10.00), or how much trouble you have installing it, it will NOT increase your horsepower. If you are a bracket racer, however, it may do a little something for your consistancy. Good luck, and...

RACE ON!!!


[Modified by CFI-EFI, 10:39 AM 12/7/2003]
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Old Dec 7, 2003 | 01:40 PM
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Default Re: up and down play in dist shaft... (CFI-EFI)

i don´t think its a problem, i only wanted to know if this is a normal condition

thank you
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Old Dec 7, 2003 | 01:57 PM
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Default Re: up and down play in dist shaft... (corvette90)

Yes its is perfectly normal. I have seen as much as .090 in the HEI distributors and about the same in the old points distributors. I have been rebuilding some older GM points distributors and modifying them with the Pertronix electronic ignition conversion kits. When those kits are installed I have to shim the end play out of the shaft for the kits to work properly.
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