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Differential Damper


fixitman

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The shop replaced the Euro Stage 1 springs with the original factory springs this week. The rear ride height came down to factory specs with a full tank of gas. So ride height isn't an issue now.

Your thoughts?

Fixitman

Now that you have the Euro Stage I springs out - can you measure their free length, count the number of coils, and measure the diameter of the wire used in the coils? That would add greatly to our data related to these springs.

As I recall, the springs had been painted, and the color codes lost - true/false?

thanks,

Carl B.

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First of all, your damper is mounted backwards.

OK - if we are talking about the Dealer manufactured part - added to dampen vibration into the body - then based on the pictures provided by twsutt in the other thread - Yes that damper is mounted backwards.

The rubber part goes toward the rear of the car.

I don't see a rubber part of the Dealer manufactured part, so I could be missing something here. I do see a rubber part on differential mount/insulator - in the pictures supplied by twsutt - But that is on a 75 280Z with the R200 rear end.

The mount in question - if there is indeed a question about the differental mount - is on a 260 Z - that is based on the 240Z body with the R180. In that case, I'm not sure about the differential mount being reversed.

Just want to make sure we are all on the same page at this point. I think I misunderstood the original question...

Secondly, I also think your sway bar is upside down as the curved part is there to allow for clearance between the bar and the driveshaft/yoke. That must be and aftermarket bar. The stock bar is straight so it clears without hitting anything.

Do you mean the stock bar is straight on a 280Z - or did you really mean it is straight on the 74 260Z?

FWIW,

Carl B.

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Thanks for your help. One problem solved. As shown on in the photos of a previous post, the dampener needs to be rotated 180 degrees.

Carl, when I get the Euro Stage 1 springs back, I'll provide photos and dimensions for the data base. You are correct, the springs were refinished with polyurethane paint, covering the paint codes. But the shop was suppose to tag fronts from rears.

So, now the question is "Is the differential mount correct and installed correctly"?

Regards,

Fixitman

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I don't see a rubber part of the Dealer manufactured part, so I could be missing something here. I do see a rubber part on differential mount/insulator - in the pictures supplied by twsutt - But that is on a 75 280Z with the R200 rear end.
Carl, my comments had to do strictly with the damper. I was referring to the the part of it that sticks up and is towards the front of the car in fixitman's picture. It should go towards the rear. It's not rubber, I did a quick glance under my car to see it's orientation and I see that part is the same material as the rest of the damper.
Do you mean the stock bar is straight on a 280Z - or did you really mean it is straight on the 74 260Z?
What I said was based on the stock bar on my 78 280Z. I'm not sure that a 260Z had a rear sway bar looking at the 74 FSM.
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So, now the question is "Is the differential mount correct and installed correctly"?

Regards,

Fixitman

I'm not positive...

I know that when you install an R200 in the 240Z body(which is all but the same as the early 260Z), you turn the differential mount around...

The pictures that were posted in the other thread are of a 280Z with the R200 and it is turned the other way (from yours now).

I'd say that the differential mount is correct in your car with the R180.

Anyone have a stock 260Z to go check???

FWIW,

Carl B.

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Long story why I've got one but here's a pic of the stock bar for fixitman's early '74 car, PN 55611-E8100 used one year only from 08/73 to 08/74. If you still have an interference problem I would compare your aftermarket bar with the one in this pic. Let me know if you need precise measurements.

PS - While I was taking the picture a friend stopped by and I explained this bar was used only one year.....he then asked how did it get so rusty in one year!

Edited by geezer
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Long story why I've got one but here's a pic of the stock bar for fixitman's early '74 car, PN 55611-E8100 used one year only from 08/73 to 08/74. If you still have an interference problem I would compare your aftermarket bar with the one in this pic. Let me know if you need precise measurements.

PS - While I was taking the picture a friend stopped by and I explained this bar was used only one year.....he then asked how did it get so rusty in one year!

What's the correct orientation for that bar? On the car as in the picture or flipped over. He's been having clearance issues and I don't think anyone has really nailed down if his bar is on upside down or not. My recollection, which ain't worth too much as it's been 10 years since I mounted one is that he has his on correctly.

Steve

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I thought I nailed it. His bar is aftermarket, not stock. I would think that the curved part is for driveshaft clearance and should be pointing downward instead of upward.

Exactly, it just doesn't look like it's pointing all that much down. Ok, at least to me. I was looking at the bends further back and they seemed to be correct for clearance. I suggested longer links so the front bend would point down more, although it would take a lot of link to make much difference.

Steve

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Thanks, Geezer. I'll let you know if I need measurements of the stock bar. I wonder what happened to my factory bar. So, which way is the bar oriented in your photo?

I might know a little more tomorrow. Today, the shop was going to add a 3/4" spacer to the links. They think that will provide enough rotational clearance.

As I mentioned earlier, the sway bars are by Quickor but the links and bushings have been replaced with Suspension Techniques' kits. Much to my surprise, the Quickor polyurethane bushings cracked after sitting around for 25 years. Suspension Techinques is the only company I could find with replacement components to fit the Quickor bar diameters. ST's link spacer might be shorter than the Quickor pieces but the bolts are longer than needed for STs standard spacer.

On the positive side, the tech had the car out for a 10 mile test drive yesterday. He said it ran strong, no nasty resonance in the exhaust, good throttle response and it handled well. I see an interior being installed soon.

Fixitman

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