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16  Camaro Research Group Discussion / Mild Modifications / Re: powerglide to th350 conversion on: June 10, 2013, 06:49:50 AM
It fits together;  that must have been GM's goal at the time.  Its just one of those things that makes one wonder what they were thinking.  The original transmission pan; has a drain plug, but yet the cross member prevents easy access to the transmission filter!  It's a real  mess to change both; the design  made an easy thing into a really irritating drippy mess. 
I've owned the car since I was 18 and  still recall my thoughts the first time under the car............."What the HuhHuhHuhHuh"
Over time I've decided they got 99% of the car right, this is just something that could have been a better design on the cross member.



Thanks for the info, I'm glad to hear that it is possible to get the pan on and off but how do you get a wrench on the bolt heads?

17  Camaro Research Group Discussion / Mild Modifications / Re: powerglide to th350 conversion on: June 09, 2013, 02:11:17 PM
Jim:

Wow it's hard to believe that GM built them that way. I'm leaning towards drilling a couple of holes to allow me to get a socket wrench on the bolts and then see if I can wiggle the pan out of there once the bolts rare removed. I don't need to remove it right now so I have time to think about it.
18  Camaro Research Group Discussion / Mild Modifications / Re: powerglide to th350 conversion on: June 09, 2013, 09:03:26 AM
Yeah I didn't want to cut the mount but it is probably the only thing to do. I hate cutting a part that has survived almost fifty years. I was also thinking of drilling two holes that align with the bolt heads so that I can get a socket wrench on them but I'm not so sure that the pan will slide out of there. It is very tight.

19  Camaro Research Group Discussion / Mild Modifications / Re: HEI distributor on: June 09, 2013, 07:45:06 AM
I contacted Pertronix about the proper voltage to supply their electronic ignition pickup and they responded that you should use a ballast resistor on initial setup but there may be problems with this in some cars. Some systems are hard starting or don't start at all due to a voltage drop when spinning starter motor. The current drawn by the starter can be so great that the voltage to the ignition drops too low to work properly. In this case they advise that you supply a full 12vdc to the ignition.

Mike.
20  Camaro Research Group Discussion / Mild Modifications / powerglide to th350 conversion on: June 09, 2013, 07:34:46 AM
I recently converted my 68 convertible from the powerglide transmission to a th350 and would like some input from anyone who has done the same. The conversion was almost a straight up bolt in swap with a couple of exceptions. I found everything that I needed to hook up the horseshoe shifter and kick-down cable at Shiftworks and I thought that I was all set until yesterday when I went underneath to look for a tranny leak and noticed that the rear motor mount cross-member covers the two rear drain pan bolts on the tranny and it looks just about impossible to get a wrench on them.  It looks like I may even have to unbolt the rear mount and lift the engine to get the pan off.

Has anyone ever seen this and how did you deal with it? Any input would be be appreciated.

Mike.
21  Camaro Research Group Discussion / Maintenance / Re: Quadrajet accelerator pump problem on: May 09, 2013, 03:57:00 PM
The first thing that comes to mind is the accelerator pump check ball hung up. The reason it seems to work with the engine running is possibly due to the slight vacuum in the area so atmospheric pressure will act on the fuel level in an attempt to equalize.

Mike
Mike

You were right on about teh pump not working at all. I was mistaken about it pumping with the engine running. When I took the top off the carb and removed the piston from it's bore it came out in pieces. The rubber had seperated from the plastic head of the piston and it was just AFU. I replaced the pump and it's working normally.

Mike
22  Camaro Research Group Discussion / Maintenance / Re: Quadrajet accelerator pump problem on: May 08, 2013, 06:57:07 PM
Mike:

Thanks for the input, and that sounds possible. Would you think that it is stuck closed or stuck open?

If it's stuck open I might be able to hear bubbles blowing back into the float bowl when I pump it. I'll have to try that tomorrow. I think that if it IS stuck open that it would at least pump a little when the engine is off.

If it's stuck closed that would explain the fact that it is dead dry with the engine off but I would expect a big flat spot in the acceleration. I'm having trouble accepting that it runs so well with the pump not working at all. I just rebuilt the carb and everything was perfectly clean and working but the engine is newly built and the builder tuned the carburetor on the dyno so he is the last one to take the top off.
23  Camaro Research Group Discussion / Maintenance / Re: Quadrajet accelerator pump problem on: May 08, 2013, 06:23:12 PM
I forgot to mention that the accelerator pump was working fine and this problem occurred after the car sat for a month or so.

Mike


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24  Camaro Research Group Discussion / Maintenance / Quadrajet accelerator pump problem on: May 08, 2013, 03:55:24 PM
I have a poser for the group. I've rebuilt more Q-jets than I can remember and have never seen anything like this. The carb is completely rebuilt including new throttle valve bushings and runs great. There is no hesitation and it accelerates smoothly and it idles great but something very odd is going on.

When I turn the engine off the accelerator pump is not working at all making it very hard to start cold! I turn the engine off and quickly pump the throttle while looking down the carb throat and it is not pumping at all. I start the engine and looking down the throat I can see that the pump is working fine. Shut it off again and no pump. I can see the pump moving up and down so the only thing that I can figure is that the float bowl is going empty as soon as I turn the engine off but if that is the case then where is the gas going? The engine does not flood and restarts easily when warm and when I loosened the fuel line at the carb there was still pressure in the line.

I'm about to take the top off the carb but thought that someone here might have an idea before I do that. Any takers?

Mike.
25  Camaro Research Group Discussion / General Discussion / powerglide to TH350 conversion question on: February 08, 2013, 07:36:40 AM


I recently replaced my powerglide transmission with a TH350 and have a question concerning the horse shoe/staple floor shifter. The shifter is adjusted and works with one exception, when I pull the shifter into low the tranny  lever reaches the end of it's travel and the car shifts into low before the shifter reaches the low gear detent. In other words, the shifter travel is too long for the transmission lever travel.

So my question is how to correct this and make the transmission lever travel match the travel in the shifter. Is there a longer lever/arm that I can put on the transmission shift shaft? Do I need to change the shifter detent?

I have searched the forums here and can't find a solution to my problem. I have read that GM used the stock horse shoe shifter with both transmissions and that it should work with both the PG and the TH350 without altering it.

I'm sure that this conversion has been done many times and would appreciate any help that you guys can offer.

Mike.

26  Camaro Research Group Discussion / Restoration / Re: 67 327 oil filter bypass valve on: January 06, 2013, 08:57:19 PM
Thanks for the help.

I took a better look at the check valve today and see how it works now. I had my engine rebuilt professionally and got it back with the spin-on filter adapter attached to the engine block without the bypass plate installed. I spun a filter onto it and started the engine yesterday and the thing leaked like a sieve so I put it away for the night. I saw the engine run on the dyno at the shop so I don't understand what happened between then and now.

I'm just going to put the stock valve plate back as soon as I get back to work on it.

Mike.


27  Camaro Research Group Discussion / Restoration / 67 327 oil filter bypass valve on: January 06, 2013, 09:32:21 AM
I searched the forums and around the net and can't find what I'm looking for anywhere and CRG has been my favorite source of info for years now so I'm turning to you guys first.

Is anyone familiar with the oil filter bypass valve plate that GM used in the early small block chevy canister type oil filters?  I have the original valve plate and am considering replacing it for new in my new engine but sometimes a new aftermarket part isn't as good as the original.

So my question is:  Does the bypass valve ever need replacing? Does it have any moving parts inside that can stick of does it just divert some oil around the filter? Has anyone ever taken one apart to see what's inside?

TIA, Mike.
28  Camaro Research Group Discussion / General Discussion / Re: powerglide specialty tool on: December 07, 2012, 06:29:27 PM
You're welcome, Mike.
Let me kniow how it works.
Jake, Basset Hound, one of three rescues here whom are 'spoiled' to the hilt...

We lost our rescue mutt after fourteen great years and she was our child, she's gone two years now and it still hurts. I'm not convinced that she can be replaced.

So I ran down to Sears hardware and bought a set of 1/4" drive 12 point socket set and another set of 1/4" drive sockets that they call universal sockets. They are supposed to fit 6 pt, 12 pt, torx and even turn stripped heads. I almost can't wait until I need to use one to see how it works. Sounds too good to be true but worth a shot.

The 1/4 12 point was good and I got the seal removed but in the process I also had the shifter lever and parking pin come out. I put the lever assembly back the only way that I think that it COULD go back in but I'm a little worried.

There was a spring loaded lever that I had to pry back in order to get the park pin in between it and fixed piece of metal and the pin is horizontal and facing the rear of the transmission. What bothers me is if removing the pin has disturbed any other internal parts. Also if this is a parking pin then what selects the shift range in the transmission? The pin is the only thing attached to the shifting lever so it must somehow shift gears, no?

Are you familiar with the assembly? Anyone?

Mike.
29  Camaro Research Group Discussion / General Discussion / Re: powerglide specialty tool on: December 04, 2012, 07:41:25 AM
Everett:

Thanks, I'm off to the tool store. I have been collecting tools for thirty years and don't have a small 12 pt socket set. BTW nice dog!

Mike.
30  Camaro Research Group Discussion / General Discussion / powerglide specialty tool on: December 04, 2012, 06:00:45 AM
I'm hoping that someone can share their knowledge of powerglide transmissions with me and save me a bunch of time. I am changing the shifter selector shaft seal and it requires you to remove the shifter shaft first. After removing the drain pan you need to loosen two small (approx 1/4") screws that secure a C clamp to the shifter shaft so that you can slide the shaft out of the tranny case. Sounds easy enough right?

Well the screw heads appear to be 12 point which is unusual in small size screws. They may even be something different but they are in a spot that makes it hard to measure them or count the points. 1/4" six point slips and 7/32" six point is too small. Metric six point won't turn them either.

My question - are these 12 point heads? Do I need a specialty tool to remove them?

Thanks in advance, Mike.
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