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  #1  
Old 30-07-2017, 07:17 PM
DJacey DJacey is offline
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Differential Mount Assembly

Hi all, I need reminding please of what the threaded holes are for marked 'A' on my 1970 240Z differential mount . Also, am I correct in saying that the small steel plate marked 'B' goes between the mount and the insulator - it's been some time since I dismantled it but I'm pretty sure it does. Thanks
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Old 31-07-2017, 09:10 AM
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johnymd johnymd is offline
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I've never seen the "A" bolt holes uses and I've never seen the spacer plate for the mount. Are these just specific to series 1 cars?
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Drives:

'73 240z 1JZ-GTE. Was pretty quick. 11.10@132.5mph
'72 240z RHD (4BOA) Being painted Orange. Bodyshop.
'72 240z LHD Black. Sold.
'73 240z LHD Green. Sold.
'73 240z LHD White. Sold - Future race car.
'73 240z LHD Blue. Sold.
'73 260z LHD Orange. Sold to a good home.
'70 240z LHD Yellow. On route and cant wait.
Skyline R33 GTS - Gone
Skyline R34 GTR - Gone
Toyota Surf 3.0TD

Go to: www.240z.me.uk to checkout the cars.
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  #3  
Old 31-07-2017, 09:39 AM
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Mr.F Mr.F is offline
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The very earliest 240Zs (to 06/71) used a different mount and crossmember and the driveshafts were angled backwards. This was quickly revised to parallel shafts and the later mount. As far as I am aware, the early mount is now no longer available and most cars will have been converted to the later configuration to bring the driveshafts into the preferred position...
The early moustache bar was also a different part number, but the later revision was listed as a "conditional" retro fit for the early version
The plate is not shown as a part in the parts book, but there is a substantial damper plate below which is often left off / gone missing as the years have passed.
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Old 31-07-2017, 10:15 AM
Albrecht Albrecht is offline
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Quote:
Originally Posted by DJacey View Post
Hi all, I need reminding please of what the threaded holes are for marked 'A' on my 1970 240Z differential mount .
The threaded holes marked 'A' on your photo are midway mounting points for the exhaust tube(s).

You will notice that they correspond to the exhaust clearance notches in the crossmember. The twin pipe exhaust system used as stock equipment on the S20-powered cars (432 and 432-R) and available as an extra-cost showroom option on L20A and L24-powered models in the Japanese market used both mounting points and both cutouts in the crossmember. The single pipe systems (as seen on Export market cars) only used the left hand side cutout and mount point.

Many cars lost the bolt-on exhaust hanger mounts over the years, as the bonded rubber failed and/or they rotted away. They were S30-series Z specific, so tended not to get replaced.
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Old 31-07-2017, 03:57 PM
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johnymd johnymd is offline
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Interesting. Every day's a school day.

Any idea why the exhaust recesses were different left to right? I would assume both pipes were the same size?
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Drives:

'73 240z 1JZ-GTE. Was pretty quick. 11.10@132.5mph
'72 240z RHD (4BOA) Being painted Orange. Bodyshop.
'72 240z LHD Black. Sold.
'73 240z LHD Green. Sold.
'73 240z LHD White. Sold - Future race car.
'73 240z LHD Blue. Sold.
'73 260z LHD Orange. Sold to a good home.
'70 240z LHD Yellow. On route and cant wait.
Skyline R33 GTS - Gone
Skyline R34 GTR - Gone
Toyota Surf 3.0TD

Go to: www.240z.me.uk to checkout the cars.
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  #6  
Old 31-07-2017, 04:17 PM
Albrecht Albrecht is offline
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Quote:
Originally Posted by johnymd View Post
Any idea why the exhaust recesses were different left to right? I would assume both pipes were the same size?
Part of the transition from horizontal pairing (at manifold and resonator) to vertical pairing (in and out of rear box). The R/H pipe goes under the L/H pipe.

So, both same diameter, but Wun Hung Lo...
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Old 31-07-2017, 09:44 PM
racer racer is offline
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Quote:
Originally Posted by Albrecht View Post

Wun Hung Lo...
Sounds Familiar
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  #8  
Old 31-07-2017, 10:14 PM
DJacey DJacey is offline
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Many thanks for the replies.

Does the attached look like the correct assembly drawing then - vertical bolt no. 14 if so I guess is the one that fits into the mount ?

Still stumped about the small steel plate though - any ideas where it could have come from ?
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File Type: jpg Fiche Section No. 8-1.JPG (10.7 KB, 25 views)
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  #9  
Old 01-08-2017, 08:58 AM
Albrecht Albrecht is offline
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Quote:
Originally Posted by DJacey View Post
Does the attached look like the correct assembly drawing then - vertical bolt no. 14 if so I guess is the one that fits into the mount ?
Yes. Here's the full twin-pipe system by way of example:

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  #10  
Old 01-08-2017, 10:43 PM
DJacey DJacey is offline
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Thanks Albrecht
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