Author Topic: Timing pointer question  (Read 2532 times)

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Offline sah62

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Re: Timing pointer question
« Reply #15 on: January 24, 2019, 06:03:51 am »
Chris measuring with a caliper its 2.410" from base to pointer tip. It looks like the center to center for the mounting holes are 2.770" could this be what is ment by "wide " in the MPC ?

Paul, can you post a picture of that pointer?
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Offline preaction

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Re: Timing pointer question
« Reply #16 on: January 24, 2019, 12:14:12 pm »
The height was measured by placing the pointer flat on a bench and using a caliper depth gauge from bench to point.
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Offline Chris Teeling

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Re: Timing pointer question
« Reply #17 on: January 24, 2019, 08:13:35 pm »
Quote
Chris measuring with a caliper its 2.410" from base to pointer tip. It looks like the center to center for the mounting holes are 2.770" could this be what is ment by "wide " in the MPC ?

It makes sense to me that the center to center distance for the mounting holes would be the width and the length would be the distance from the timing chain cover mounting surface to the tip. In that case, the 2.77 in dimension matches the center to center dimension on the timing cover holes.

A problem with this interpretation is explaining the 2.22 in dimension for the C9OZ-6023-A.  This one doesn't match either the mounting pattern or length of known 428 SCJ pointers.

I attached a picture of what I consider to be a "standard" pointer same as your picture above and a SCJ pointer. The "length of the standard pointer is approximately 2 3/8 in (by tape measure, not vernier) and a SCJ pointer that is approximately 2 7/8 in long.


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Offline sah62

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Re: Timing pointer question
« Reply #18 on: January 25, 2019, 07:34:05 am »
I have an alleged '68 pointer coming to me in the mail later today. Chris, if it's indeed shorter than the 69/70 pointer I could send it to you for a picture of all three side-by-side.
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Offline sportyworty

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Re: Timing pointer question
« Reply #19 on: January 25, 2019, 12:56:57 pm »
I just checked 3 with calipers and they are same dimensions and profile as Paul's posted pic and dimensions. I have zero doubt they are correct original to 1968.5 CJ engines. The covers were March May and June 1968. I suspect likely would have noticed the difference playing with almost always 68 parts and selling a lot of covers to 68.5 peeps. Randy has my 4th one at his house finishing the 68 CJ engine rebuild and we can see what he says as well. I also had Chris Thauberger's 68 GT 500 engine here with same pointer pre CJ.
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Offline sah62

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Re: Timing pointer question
« Reply #20 on: January 25, 2019, 05:01:00 pm »
I attached a picture of what I consider to be a "standard" pointer same as your picture above and a SCJ pointer. The "length of the standard pointer is approximately 2 3/8 in (by tape measure, not vernier) and a SCJ pointer that is approximately 2 7/8 in long.

A few more data points:

The '68 pointer that I bought from West Coast Classic Cougar matches what Paul and sporty are saying above. It's about 2.4" (close to 2 3/8") from bottom of base top end of tip. See the "dirty" picture below.

The reproduction 69/70 CJ pointer is about 2 3/4" long, or 1/8" LESS that what Chris described above as the SCJ pointer. See the "painted" picture below. I can't go pull the pointer from my engine to check, but does anyone have an original pointer from a 69/70 CJ to throw another measurement into the discussion? The MPC and engineering drawings all suggest that there were three pointers, so if these measurements are accurate we may finally have this figured out:

C8AZ-6023-A (1968 CJ, 2 3/8")
C9AZ-6023-A (1969/70 CJ, 2 3/4")
C9OZ-6023-A (1969/70 SCJ, 2 7/8")
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Offline Brian Conway

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Re: Timing pointer question
« Reply #21 on: January 25, 2019, 06:11:07 pm »
From my car.  Brian
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Offline RoyceP

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Re: Timing pointer question
« Reply #22 on: January 25, 2019, 06:51:33 pm »
That totally makes sense that Ford would lengthen it. The one on my '68 1/2 cannot be seen without removing the smog pump. I can see the harmonic balancer, the pointer does not go all the way across, so seeing the pointer is impossible.

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Offline Chris Teeling

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Re: Timing pointer question
« Reply #23 on: January 25, 2019, 09:10:16 pm »
Quote
That totally makes sense that Ford would lengthen it

Agreed but why would Ford have two different pointers that are essentially identical (1/8 in difference in length)?

Either one would work for both the CJ & SCJ balancers.





« Last Edit: January 25, 2019, 09:49:43 pm by Chris Teeling »
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Offline RoyceP

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Re: Timing pointer question
« Reply #24 on: January 26, 2019, 07:57:41 am »
I see what you mean, the SCJ pointer would have worked on all of them.

Quote
That totally makes sense that Ford would lengthen it

Agreed but why would Ford have two different pointers that are essentially identical (1/8 in difference in length)?

Either one would work for both the CJ & SCJ balancers.
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Offline sah62

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Re: Timing pointer question
« Reply #25 on: January 26, 2019, 08:03:46 am »
Quote
That totally makes sense that Ford would lengthen it

Agreed but why would Ford have two different pointers that are essentially identical (1/8 in difference in length)?

Either one would work for both the CJ & SCJ balancers.

I have no idea, but we have documentation that describes three different parts. The measurements confirm the length differences that are described in the engineering drawings.
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Offline Chris Teeling

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Re: Timing pointer question
« Reply #26 on: January 26, 2019, 03:44:39 pm »
Provided that the repro is accurate at 2 3/4.

Can we get an owner of an original late 69 or 70 Cobra Jet to provide a measurement shot similar to the one that Brian posted?
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Offline sah62

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Re: Timing pointer question
« Reply #27 on: January 27, 2019, 04:07:50 pm »
Seriously? No one has a 69/70 CJ pointer available for a picture?
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Offline sah62

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Re: Timing pointer question
« Reply #28 on: January 27, 2019, 06:47:53 pm »
Here's a shot from Marcus' detailing article. There's no measurement, but it's obviously longer than the C8AZ-A pointer.
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Offline 70cj428

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Re: Timing pointer question
« Reply #29 on: January 27, 2019, 09:26:57 pm »
Hi Scott, I have both a 69 pointer , and I can measure the pointer on one of my 70's (Early Metuchen Car), as well as an NOS pointer but I can't measure and photograph them till tomorrow if that will work …..

John
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