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Disassembly Procedure, Tach Drive Distributor?

fine69

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Dec 12, 2004
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975
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'69 Convertible Vette; '72 Z28 Camaro Rally Sport
What's the procedure for removing the main distributor shaft from a tach drive distributor?

I drove out the pin and removed the drive gear, loosened the breaker plate assembly, removed the vacuum advance can, and removed the brass cross-gear tach drive gear housing. I can pull the main shaft up and out about 1.5" then it gets caught up on something and I can't move it any further.

What am I missing? Any suggestions are appreciated.

Thanks.
:w
 

bobs78

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Jun 6, 2004
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90
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Hot AZ
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50th AE vert - 25th SA - 54 Polo White
It should just come right out. Sounds like there may be a burr on the lower end of the shaft. IMHO

Oh, one other thought, if the tach drive gear is stripped which is probably the reason your removing the shaft in the first place, the chewed-up gear on the shaft may be binding on the housing bushing.
 

motorman

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Mar 7, 2002
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849
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pa
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2008 Crystal Red Tint Coat
What's the procedure for removing the main distributor shaft from a tach drive distributor?

I drove out the pin and removed the drive gear, loosened the breaker plate assembly, removed the vacuum advance can, and removed the brass cross-gear tach drive gear housing. I can pull the main shaft up and out about 1.5" then it gets caught up on something and I can't move it any further.

What am I missing? Any suggestions are appreciated.

Thanks.
:w
there is dried oil residue in the shaft which increase the diameter and you will need to spray something like brake cleaners to soften it up so you can pull the shaft thru the bushing
 

bradfordsvettes

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Mar 28, 2001
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549
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Boston, MA area
Corvette
jewel blue 61.cranberry 69 t-top.black rose 92
like motor man said there is a varnish build up on the shaft .spray some gumout in the holes in the bottom of the dist and keep working the shaft up and down it will free up eventually. good luck steve
 

fine69

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Dec 12, 2004
Messages
975
Location
Maryland / D.C.
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'69 Convertible Vette; '72 Z28 Camaro Rally Sport
like motor man said there is a varnish build up on the shaft .spray some gumout in the holes in the bottom of the dist and keep working the shaft up and down it will free up eventually. good luck steve

Thanks Guys.

I went ahead sprayed it as suggested... nothing yet. When I try to remove the main distro shaft, it really feels like metal against metal - or like something is still connected. I'll keep at it.
 

Jack

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Dec 27, 2000
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Florence, SC (Timmonsville SC)
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Ralph:
Where you drove the pin out of shaft ... is there a burr around the holes in shaft?

As Bob78 said ... maybe a stripped tach gear on shaft is burred?
 

fine69

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Joined
Dec 12, 2004
Messages
975
Location
Maryland / D.C.
Corvette
'69 Convertible Vette; '72 Z28 Camaro Rally Sport
Ralph:
Where you drove the pin out of shaft ... is there a burr around the holes in shaft?

As Bob78 said ... maybe a stripped tach gear on shaft is burred?

Jack,

You guys were right.

In looking closely on the shaft immediately below the tach gear (where it gets wider), there are small burrs on it.

Hmmmm.... how do I take care of this? A small file?

Thanks.

Ralph
 

bobs78

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Messages
90
Location
Hot AZ
Corvette
50th AE vert - 25th SA - 54 Polo White
Yea, just take a file and clean it up :)
 

GTR1999

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Sep 4, 2003
Messages
1,146
Location
New Haven CT
Corvette
1969,1972,1975
With it apart look at the sideplay in the bushings, it shouldbe only about .001-.002. The lower wears out faster then the upper. Look at the bore in the housing for chewed up bottom, the early distributors didn;t use a plastic button on them and the iron will get faced off by the gear over time. The GM gears are the best and I've had my share of problems with some of the aftermarket shafts and gears. Shim the endplay to .007-.010. Replace the vacuum can, use good points and you'll be ready to go. I also mill oil slots in the distibutor so I can set them up to fit under the chrome cover and still get oil splash on the main shaft.






 

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