CFI-EFI

So acratch away!


WHAT "86 posted above"???



??? The question is... Why does one book say to change the weight, while another doesn't, with the same damper???



I checked, if you read the above post. It says the 1984 - 1991 C4s all take the same damper.

RACE ON!!!

CentralCoaster

The 86 damper pics posted by 86PACER that started this thread, you blockhead.

My 85 manual says nothing about any pins or reusing them. If the later manual does, with the same part, I would consider that superceding information if any early cars do have pins.

But I suppose GM saw a need to put pin weights in them at some point later on. Perhaps none of the early cars have pins to begin with, so the pin swapping doesn't apply.

mseven

In context to the sentence I thought they were trying to say to: remove the weight from the "old" damper not the odd damper....if the spelling is correct (odd), are we to believe they were balancing each damper individually and some were just that out, or was it done as a complete rotating assembly? I think I'm going to try and get this one thrown on a balancer and find out.
I knew you were from the "show me state" that's why I posted the FSM pic. However , when I did look through parts numbers they did show they were all the same, that's why I originally posted the info.
As to Central Coasters comment, It would appear that a logical answer maybe that GM discontinued the added weight for a dynamic balance, through simply removing weight in the "heavy" spot to balance it. The damper 86 pacer showed, has an additional hole in it than my original..........so who really knows what the hail is going on here???

86PACER

Old damper has no weights. New damper has no weights. New damper's instructions say nothing about weights, nor does my '86 shop manual. The only thing the new damper came with was a new woodruff key.

Autozone has both the puller and install tool. Damper is in. All is well.

CentralCoaster

Actually your new damper comes with a blind hole drilled in the back of it, probably for balancing.

CFI-EFI

Why didn't you just say that the first time. 86PACER's pix were three pages back. The damper "posted above" was mseven's, 1990 damper.



I don't think any of the earlier cars have balance weight pins. If GM changed the part to include the pins, I would expect they would have changed the part number.

RACE ON!!!

CFI-EFI

That opening 2 sentence paragraph of mine you are referring to was written, tongue in cheek. It was supposed to be humorous. That is why I began the next paragraph with "Seriously, ".



They didn't discontinue the weight, because it wasn't mentioned in the 1984, 1985, or 1986 FSMs that have been reported on, nor does it appear they exist in those cars. Your 1990 FSM is the only book we know of that mentions the weight. Therefore, rather than being deleted, it would have been added. Again, I have to wonder, if it was added, why didn't the damper part number change? Can we get reports from the owners of 1987, 1988, and 1989 FSM? How about from a 1991 FSM?



Good question. I, for one, would really like to know.

Mick, Your damper should be neutral balanced, with the weight. Why is yours off, available for pictures? If your outer ring has spun, checking the balance won't work.

RACE ON!!!

mseven

oops ....
Actually when I went through mine I put a new damper on (w/new weight). At the time the new damper from GM looked exactly the same, I did this because I had read so many issues w/dampers that I figured I'd start w/everytrhing fresh. I was considering looking at balance between one w/weight and one w/out to see if one or both is truely nuetral or?? may shed some light on this a bit more. I think a freind of mine who does rotating ***. might be able to check it...actually the new one is off too
http://i7.tinypic.com/6cwsgzs.jpg

CentralCoaster

Because I am omnipresent, (like Jesus), I see all pages at the same time. For the rest of you mortals, you can also set your default to view more posts per page.

Why should it? The part didn't change. A seperate part was added to it. This is why the manual says to transfer the weight over to the replacement item. Now if it came with the weight installed, it should be a different p/n than the ones without.

But with all that said, I'm 99% sure that it was just a renegade engineer on the chopping block that decided to make his legacy by added that little weight to aggravate purists and techies.

mseven

well you may be correct, and for others following this thread and comments, here ya go.....as it turns out I had two different dampers put on a balancer today at a reputable machine shop that I know. The results were that the one w/the weight was very close to neutral balance (as CFI stated they all should be) the operater told me it was so close it wouldn't be worth "dinking" it. In addition it would take about 3 pin weights that size to throw out the balance. The other was a new OEM one I have for the car and w/out any weight added was at neutral balance....so it appears that GM does have a sadistic sense of humor...but I guess anyone with a vette knows that.