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Vibration dampener thingy


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It would be interesting to know why its there. My 77 doesn't have it and never did. I know another owner that does not have it either. So if it was there for noise deadening, or what ever reason, then shouldn't it have been on every 77? Assuming it's from your 77 280. I don't recall seeing it in the FSM either. I'll have to look for it when I get home.

Edited by rcb280z
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It's a " Mass damper " . I believe Nissan used it to combat a noise issue from the diff of the R200's. Some of the gear whine or singing which seems to be fairly common on the R200.  There may be TSB on it... 

 

Edited by Chickenman
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These dampers get added when a manufacturer discovers an unwanted truth about their drivetrain after it's too late to come up with a more elegant solution.  And you know how car companies hate adding invisible items to a vehicle that don't add to the profit margin, so there has to be a substantial problem before they'll add something like this.  When I worked with a manufacturer (who shall remain nameless) on the public launch of one of their prestige-class models ten years ago, I found a very similar device attached to the rear diff casing on the versions with the optional AWD powertrain.  And this was well into the era of CAE, FEA and computer-driven lab-baseddrivetrain testing.  I expect that the usual issue is a buzz or drone at a key highway cruising speed.  An 'enthusiast' owner, of course, may never notice the issue.

 

 

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Yep, mine had one.  But once it was off it never went back on and since I don't track my car, I haven't noticed any difference in noise or performance.  Maybe my hearing or expanded waistline has something to do with it??

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On 7/22/2018 at 7:02 AM, rcb280z said:

It would be interesting to know why its there. My 77 doesn't have it and never did.

It probably had it at one time.  What's surprising is that Nissan didn't at least polish them up after their introduction.  1978 is just as ugly as my 1976.  

They make a good portable shop anvil.

Your link didn't come through.  Here it is...

 

 

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 I find it hard to believe that's a factory part. The one in grannyknot's pic isn't lead. Lead doesn't rust. That looks like someone? bolted a thick steel plate to the car and started welding on more plate until they got the desired effect or gave up. That thing in the pic looks crude at best. Do they all look that bad?

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21 minutes ago, Mark Maras said:

 I find it hard to believe that's a factory part. The one in grannyknot's pic isn't lead. Lead doesn't rust. That looks like someone? bolted a thick steel plate to the car and started welding on more plate until they got the desired effect or gave up. That thing in the pic looks crude at best. Do they all look that bad?

You have to read through that whole thread to realize that there was confusion about a retrofit, and a factory installed part.  The factory part is just steel.  Yes, they all look that bad.  I've seen many in the wrecking yards, and I have three.

Even Nissan tried to hide them, and only showed an edge.

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On 7/22/2018 at 5:09 AM, grannyknot said:

Does this crude looking thing actually work at quietening down the R200 diff? Wondering if I should reinstall?

 

IMG_0933.JPG

Just realized that yours has lost its bottom plate.  The countersink is actually a bigger hole in the the bottom plate (missing in your picture).  So it's broken and won't work anymore.  Better get a new one.

http://www.carpartsmanual.com/datsun/Z-1969-1978/axle/rear-suspension/83

https://www.courtesyparts.com/?p=catalog&mode=search&search_in=all&search_str=55418-N3701

 

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19 minutes ago, Zed Head said:

Just realized that yours has lost its bottom plate.  The countersink is actually a bigger hole in the the bottom plate (missing in your picture).  So it's broken and won't work anymore.  Better get a new one.

I think you are right ZH,  can you imagine the damage a 4"x7"x 3/8" steel plate could do the guy following behind when that thing fell off? So my damper is about a 1/3 lighter than most,  does that mean I can call it "custom tuned"?

Edited by grannyknot
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