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[Datsun 1200 encyclopedia]

Leaf Springs

Revision as of 03:35, 31 March 2016; view current revision
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Category: Rear Axle And Rear Suspension

Datsun 1200 used the tried and true leaf spring rear suspension, which was common among most cars - including american cars - in the early 1970s. Also known as blade springs or cart springs.

Contents

Overview

Sedan and Coupe use the same leaf-pack.

VB110 Wagon came with heavy-duty spring pack.

The B120 1200 Truck came with standard or optional (heavy-duty) rear leaf springs. Standard was a 4-leaf pack, while optional was a 5-leaf pack with a stiffer spring rate.

55020-H1000 Sedan, Coupe $159 USD
55020-H1400 Van (heavy duty)
55020-G1000 Truck 4-leaf early
55020-G1001 Truck 4-leaf 7510-
55020-G1002 Truck 4-leaf 8504-
55020-G1060 Truck 5-leaf 7804-8503
55020-G1061 Truck 5-leaf 7804-8503 8504-

Ute 4-leaf pack Type 1
21316.jpg th_leaf-overrider.jpg

Ute 4-leaf pack Type 2 (2nd leaf overlaps 1st leaf)
24758.jpg

Rear Shackle is same for all 1200s
24931.jpg

Front 3-point Mount Plate (Sedan, Coupe)
18675.jpg

Sedan rear shackle pin bracket
18674.jpg

Details (truck, Pin front mount)
24929.jpg th_leaf-pins.jpg

Truck rear shackle pin bracket
12728.jpg
Truck front leaf pin
12729.jpg

Custom adjustable shackles
th_shackles.jpg

Spring Specifications

All 1200 springs are: 1110 mm long, 50mm wide

Spring Eye Diameter
* Coupe, Sedan, Van: 35mm front,  23mm rear
Sedan, Coupe
* 3 leaf: 1 x 6mm thick, 2 x 7mm thick

Van 
* 4 leaf std: 3 x 6mm thick, 1 x 13mm thick
* 4 leaf H-D: 2 x 6mm thick, 1 x 7mm thick, 1 x 11mm thick
Truck 
* 4 leaf: 2 x 6mm thick, 1 x 7mm thick, 1 x 13mm thick
* 5 leaf: 2 x 6mm thick, 1 x 7mm thick, 2 x 10mm thick
Free Camber
* Sedan, Coupe: 109mm +-3
* Van         : 131mm +-5
* Truck       : 118.5 mm 

Laden Camber
* Sedan, Coupe: 11mm @ 192kg
* Van: 11mm @ 295kg
* Truck std 4-leaf: 18.5mm @ 267kg
* Truck HD 5-leaf:  15.1mm @ 376kg
Spring Rate
Sedan,Coupe: 109 lb/in
Van: 137 lb/in (on overrider)
Truck 4-leaf: 149 lb/in (on overrider)
Truck 5-leaf: 203 lb/in (on overrider)

Leaf Mounting

Also see: Shocks#Mounting

B110 mounts leaf directly to metal (unlike B10 and B210 which use rubber-based isoclamp).

Rear axle mounting
24932.jpg

3772.jpg

Spring Seat

Spring Seat Assembly
Sedan: 55262-H1001 
Truck: 55262-G1000 (RH) 12mm shock Nut wide u-bolt
Van:   55262-H1401 (RH) 12mm shock Nut narrow u-bolt
       55262-H1402 (RH)   (from '73-6)
Coupe: 55262-H1801 (RH)  8mm shock Nut
       55262-H1802 (RH)   (from '73-5)

18451.jpg

Also see Shock absorbers

H10 Sedan (plain seat without shock stud)

G10 B120 Truck large stud for shock + large U-joints
24027.jpg 25582.jpg 25583.jpg
H18 Coupe small stud for shock
1201.jpg post
Sedan and Coupe parts
18721.jpg

U-bolts

U-bolts
55247-H1002 CLIP-rear spring Sedan, Coupe.USA
55240-H1800 Coupe.JPM.early 
55247-H1401 CLIP-rear spring Van, Coupe.JDM.late
55247-G1000 CLIP-REAR SPRING Truck 4-leaf
55247-G1060 CLIP-REAR SPRING Truck 5-leaf 7804- 
Fasteners for U-bolts (Sedan,Coupe,Van,Truck)
08911-64010 NUT-HEX M10 x 1.25 8
08915-14010 WASHER-spring lock 8
Sedan
14584.jpg
Ute U-bolts (same M10 diameter but wider spacing for larger axle tube)
24930.jpg
Ute U-bolts fit over 62 mm axle housings (62 mm inside diameter)
26351.jpg

Bound Bumpers

Coupe, Truck & Van rear suspension bumper (above the axle housing)
55240-G1900 ASSY-BUMPER REAR AXLE > 55240-H1800 > 55240-H1400
08911-64010 NUT-HEX M10X1.25
08915-14010 WASHER-SPRING LOCK
11171.jpg 24926.jpg
Sedan rear suspension bumper (on the Shocks)
55240-H1001 BOUND BUMPER A
56124-H1001 BOUND-BUMPER B
24801.jpg

Truck Bound Bumper
post

Torque Arrester

The Torque Arrester (pinion snubber) is a rubber bumper that prevents the leafs from rotating too much under torque input.

24159.jpg

See Rear Axle

Bushings

18316.jpg

5 55044-H1001 front upper Sedan, Coupe
  * superseded by 55044-H5001 $4.90 USD
  24085.jpg
6 55045-H1000 front lower Sedan, Coupe [leaf eye, course] $3.63 USD
  24086.jpg Leaf%20Spring%20Eye%20Rubber%20(55045-H1000).jpg
17 55046-H1000 rear upper $2.27 USD
  24927.jpg
18 55047-H1000 rear lower [leaf eye, plain] $1.22 USD
NOTE: B210 USA uses the same bushes as 1200 Coupe/Sedan.

Wagon & Ute
24922.jpg

V 55045-H1400 front Van, Truck [leaf eye, fine] $4.25 USD
  24924.jpg
20900.jpg
55044-H5001
20429.jpg

Ute/Van complete set
24928.jpg

Make your own

Or, make your own performance bushings per Nissan Competition book:

  • 16273.jpg
    • I went to a local platics place and bought a piece of

Aftermarket

Or, get stiff aftermarket bushings:


I got in touch with MADDAT.COM and they knew exactly what I was looking for. They had it in stock from Super Pro (yes they're polyurethane), sent them right out, and I received them 8 days later here in Arizona, USA. Tamra from the sales department was easy to work with and very helpful. I would recommend these guys to anyone who needs parts for their 1200. Front spring eye bushing on rear leaf spring

Polyurethane bushings out of Mexico: Parbo

SuperPro Bushings

Lowering Springs

See main article: Lowering Springs

th_5.jpg

Also See: Lowering

120Y Springs

120Y B210 leaf spring is 1165mm. It is 55mm longer than 1200 B110 (1110mm) and is not interchangeable.

album

B210 use an Isoclamp system which means the bolts are farther apart, even though the leaves are the same 50 mm width as 1200 leaf springs.

B210 Coupe
2487.jpg 2488.jpg 

B210 Sedan U-bolts (plate has wider spacing than B110)
album

Bolt holes 3 inches
full

Alternative Leaf Springs

Composite Leafs - see 2013 group buy
967.jpg

See Suspension_upgrades#Smooth_ride

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