Jump to content

Namerow

Differential front mount insulator for a 1970 S1 240Z - NLA?

Recommended Posts

I noticed today that MSA has begin to offer refurbished differential hanger brackets on an exchange basis.  In their write-up on these new parts, they discuss applications in relation to solving the differential 'clunk' problem and emphasize that Series 1 owners will need to install the Series 2 differential hanger parts and moustache bar in order to be able to use the Series 2 front insulator (I believe that this is because the arrestor strap won't fit otherwise). 

 

This made me curious, so I started to look around some of the commonly-used parts vendors' websites to see if anyone was offering the Nissan Series 1 part (PN 55415-E4102, for reference).  A quick look turned up 'not available' at Rock Auto and Chesapeake Nissan.  Z-Car Source of Arizona offers only used units, and only on special order.  Courtesy Nissan lists the part and a price, but that doesn't mean they have it or can get it (I haven't asked them yet).  MSA lists it, but warns that it "...has been discontinued by Nissan or another manufacturer, and we are currently in the process of locating an alternate supplier or having the item reproduced"

 

So:  Is a new OE Series 1 diff mount/insulator definitely NLA ?  If so, are there any known aftermarket options?

Share this post


Link to post
Share on other sites

I noticed today that MSA has begin to offer refurbished differential hanger brackets on an exchange basis.  In their write-up on these new parts, they discuss applications in relation to solving the differential 'clunk' problem and emphasize that Series 1 owners will need to install the Series 2 differential hanger parts and moustache bar in order to be able to use the Series 2 front insulator (I believe that this is because the arrestor strap won't fit otherwise). 

 

Edit - I was looking at the wrong part.

 

Here's the link.  Not good that they're running out.  We should all start hoarding.

 

http://www.thezstore.com/page/TZS/PROD/23-4614R

 

Edit 2 - also realized that they are charging $149.95 for a sand blast and paint on some pretty small parts.  Seems excessive.

 

Edit 3 - An AFM, with a core sent in, costs $169.95.  For reference.

Edited by Zed Head

Share this post


Link to post
Share on other sites

They should just call it what is - "Sand blast, inspection and powder-coating".  They're not really selling the part, they're just refinishing.  No core, no part.  Once you know that, you can check your local powder-coating shops with your original parts and decide what premium shipping to MSA offers.  They probably farm it out anyway.

 

Of course, the consumer should always know what they're paying for.  I was just illuminating.

Share this post


Link to post
Share on other sites

Sorry to revive an old thread, but have been looking for the impossible which is the early diff front mount insulator, ie., # 55415-E4102.

Does anyone have a photo of this insulator and a photo of the later insulator, 55415-E8300?  Just wondered if this later insulator could

be turned around to work as #55415-E4102.

Thoughts?

Share this post


Link to post
Share on other sites

Here are some pix that I've accumulated from this site and others (apologies to the owners -- I didn't record names with photos).

Picture #1 shows the top surfaces (front of car points right)... 240Z early type (55415-E4100/4101/4102) on the top, 240Z later type (55415 E8300, introduced in 7106 for the MY1972 240Z) on the bottom...

xS30 Differential - Front Mount Insulators - OE - 240Z early vs late - top.jpg

 

Picture #2 (below) shows the bottom surfaces (front of car points up)... early type (55415-E4102) on the left, later type (55413 E8301) on the right...

S30 Differential - Front Mount Insulators - OE - 240Z early vs late - bottom.jpgx

 

Picture #3 (below) shows a third type (55415-E8301) which -- if I read the parts manual correctly -- was offered between 7308 - 7412 (which would make it specific to the 260Z, I believe)

xS30 Differential - Front Mount Insulator - OE - 260Z - bottom.jpg

 

Picture #4 (below) shows a fourth type (55415-N4300/4301) introduced in 7501 and therefore specific to the 280Z.

xS30 Differential - Front Mount Insulator - OE - 280Z a.jpg

 

Going back to Picture #1 and #2, it looks to be like the 'early' and 'later' 240Z designs, there doesn't appear to be anything different about the hole spacings/positions for the two mount bolts.  The location and size of the threaded centre stud looks the same, too.  The upper/outer plates have different shapes, but I don't see anything that would prevent re-shaping the contour of the later style plate if that's needed to make it fit into a Series 1.

Also, the width of the inner plate's 'jaws' looks similar, early vs late, so it appears that the later style mount would fit down over the early style crossmember.  I emphasize the word, 'appears', because I've never read anywhere that this can actually be done.  Perhaps someone else has tried this and can comment.  For possible reference, Picture #5 (below) shows the early-style insulator sitting in position on top of the matching front crossmember.

BTW, I don't think there would be any need to turn the later style insulator back-to-front to make it work in Series 1 application.  Again, others who've actually tried this may have a different opinion.

S30 Differential - Front Mount Insulator - OE - 240Z early a.jpg

In case you're curious, the threaded holes in the crossmember on either side of the insulator are provided to take a bolt that retains an exhaust system hanger piece.

Edited by Namerow
early vs late mis-labeled in Pix 1 & 2

Share this post


Link to post
Share on other sites

WOW, Namerow, you have exceeded all expectation with your reply.  Many thanks.  

Since posting my inquiry, I have gotten very lucky and have found all of the pieces,

used condition so far, to make the conversion from post 7/71 series 2 differential rearward

 location to the pre 7/71 series 1 forward position.

I agree, Namerow, that it "appears" that the later front diff mount insulator (55415-E8300)

should Interchange with the earlier insulator, (55415-E4102).

The club parts CD shows that the early (55415-E4102) insulator needs to be used in

combination with the early diff front mount crossmember (55411-E4100), and do not interchange with

the later insulator (55415-E8300) and mount crossmember (55411-E8300).

From what I have been able to find, others have tried to use the later insulator to move 

the diff to the series 1 location and bolt hole locations just didn't quite line up without the need for

serious modifications, if that were at all possible.

anyway Namerow, you pictures are terrific only to be exceeded by your ability to do searches.

Thanks Again,

Dan

 

 

Share this post


Link to post
Share on other sites
11 hours ago, Namerow said:

Here are some pix that I've accumulated from this site and others (apologies to the owners -- I didn't record names with photos).

S30 Differential - Front Mount Insulator - OE - 240Z early a.jpg

In case you're curious, the threaded holes in the crossmember on either side of the insulator are provided to take a bolt that retains an exhaust system hanger piece.

 

Also, good info on the stock exhaust hangar location.  That would be the threaded hole just to the right of the 

insulator in your picture, above.  Not sure what the threaded hole just to the left of the insulator, as pictured,

is for, unless there was a dual exhaust setup for other S30 iterations.

As luck would have it, I do have that NOS stock steel/rubber composite early exhaust hangar as well.

Let the fun begin.

Dan

Edited by AZ-240z

Share this post


Link to post
Share on other sites

Hi Dan,

My blue 240Z (03/70) ,it has E8300 or 8301 insulator!!

 I did not know that until I saw it last year, probably Tetsu (restorer ) could not get E4101/4102 when the car was in a restoration in 1999. Now I have NOS E4102 , the label which is on it says 06/06/16 . This would mean 2006 / June / 16th.

I have forgotten that I need to do it but now I want to replace 8300/8301 to 4102 soon, 

I am very curious how did Tetsu fit a 8300/8301 on a 1970 240Z. Looks like it is turned 180 degrees , maybe we do not need to modify anything? 

Kats

 

 

 

Share this post


Link to post
Share on other sites
1 hour ago, kats said:

Hi Dan,

My blue 240Z (03/70) ,it has E8300 or 8301 insulator!!

 I did not know that until I saw it last year, probably Tetsu (restorer ) could not get E4101/4102 when the car was in a restoration in 1999. Now I have NOS E4102 , the label which is on it says 06/06/16 . This would mean 2006 / June / 16th.

I have forgotten that I need to do it but now I want to replace 8300/8301 to 4102 soon, 

I am very curious how did Tetsu fit a 8300/8301 on a 1970 240Z. Looks like it is turned 180 degrees , maybe we do not need to modify anything? 

Kats

 

 

 

Kats, it's good to hear from you.  Interesting that Tetsu was able to fit an E8300/8301 insulator on your car. 

I would be interested to know which front diff crossmember he used with it, and if he did turn it 180 degrees

to line up the mounting holes.  Was he able to fit the early composite exhaust hangar?  Good find with the

NOS E4102.  That insulator in NOS condition can no long be found on this side of the pond.

Dan

Share this post


Link to post
Share on other sites

Dan,

Please see these pictures. I think cross member is original 55411-E4100 because an earliest muffler hanger is used on the member,

and do not see any obstraction by the mounting insulator 55415-E8300/01.

I want to know what is a difference between the two cross members, shape ? or no- muffler hanger welded nut?

3rd picture is my 12/1971 Orange 240Z, this shows how an E8300/01 should be installed correctly.

4th picture is my 01/1970 Z432, cross member is 55411-E4100, it has two welded nut , right one is for the hanger of dual exhaust system

standard for Z432, an optional for Z, Z-L . 

Kats    

IMG_4149.JPG

detailfainal 019.jpg

IMG_4341.JPG

IMG_4585.JPG

Share this post


Link to post
Share on other sites

Pictures from the service manual,

Second picture, you can see the new muffler hanger , new curved rear cross member, and the mounting insulator 55415-E8300.

Kats

IMG_2745.JPG

IMG_2744.JPG

IMG_2746.PNG

Share this post


Link to post
Share on other sites

FWIW, there's a vendor in Japan currently offering the 240Z early-style insulator (55415-E4102) for low, low price of just 28,000 Yen (that would be about US$375!)

Share this post


Link to post
Share on other sites

Here's another photo that I forgot to post yesterday that illustrates in pretty dramatic fashion how this insulator can collapse with age.  Not surprising, given that the cross-section of the rubber core necks down to what looks like only 1/8" in width...

S30 Differential - Front Mount Insulator - New vs Collapsed.jpg

(As before, my apologies for not being able to credit the owner of this photo.)

If you go back and look at Photos #1 and #2 of my earlier post, you can see how the later-style insulator's design changed so as to significantly increase the width-wise dimension of the rubber block at the front.  Perhaps this was an effort to reduce the insulator's vertical compliance.

The crest built into the top of the rubber block indicates that insulator was obviously designed to bottom out.  Still, it doesn't look like you'll be doing this insulator any favours, long term, if you use the diff casing as your rear jacking point.

@HardwayOn a related point, Hardway's recent post in which he stuffed coolant hose into the insulator opening to (successfully) cure a diff 'clunk' issue suggests that his front insulator is now operating in a permanently bottomed-out condition.  Waiting to hear whether he reports any significant increase in gear noise coming into the cabin as a result.  If he doesn't, then that 'stuffing' fix may make replacement of a collapsed front insulator a non-issue.

Share this post


Link to post
Share on other sites
On 8/1/2017 at 6:38 PM, kats said:

Pictures from the service manual,

Second picture, you can see the new muffler hanger , new curved rear cross member, and the mounting insulator 55415-E8300.

Kats

IMG_2745.JPG

IMG_2744.JPG

IMG_2746.PNG

Kats, I have finally found all of the necessary parts for my differential relocation, and wanted to again 

thank you for helping me find a NOS diff. insulator.  

below, I wanted to include a picture of my restored mustache bar as I have, again, taken a lesson 

from you on how this should be done.

Thanks again, Kats.

 

 

A54EBDEF-B9CE-48DC-ACFC-0A2E658DC60D.jpeg

BC83EA66-B36B-442B-88F3-7FAE5E9355CF.jpeg

Share this post


Link to post
Share on other sites

Hi, I’m resurrecting this thread. I am looking for an NOS diff mount, Part #55415-E4102. 

 

Does anyone have one?

Thanks!

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.