Hydraulic clutch

Revision as of 02:38, 24 February 2008; view current revision
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Left-hand-drive (LHD) versions of the Datsun 1200 used a hydraulic clutch system. It is very nice, with a light, linear action. Stock pedal force is 10.8 kg (23.8 lb), a bit higher than the RHD mechnical clutch at 8.3 kg (18.3 lb). The slave cylinder diameter is 3/4 inch and the master cylinder is 5/8 inch.

• Extremely light clutch pedal effort, but with good feedback.

Adjustment

This is for the 71-73 1200. The B210 (120Y) measurements are different.

1. Adjust slave cylinder free play
2. Adjust pedal pad height without stopper
3. Adjust pedal stopper

Clutch Slave Cylinder

Stock clutch slave cylinder diameter is 3/4 inch.

Adjust the free play to 5/32".

Pedal Linkage

Before adjusting the pedal linkage, first adjust the clutch release arm under the car.

The specs are:

• Pedal height: 5.57 in (141.5 mm)
• Pedal free play: 1.181 in (30 mm)
• Pedal stroke is 5.65 in (143.5 mm) with the adjustment stop (the switch in the diagram) backed off. Adjustment is made with shims for the cylinder on the firewall.

Adusting Shim

• 30611-27260 1.6 mm
• 30612-27260 0.8 mm
• 30613-27260 0.5 mm

Removable, Replacement and Bleeding

If the Master Cylinder runs dry, or when replacing it, be sure to bleed the Master Cylinder separately.

Remove the pipe & place a thumb over it for the return stroke of the pedal to prevent ingestion of air. Once the Master Cylinder is free of air you can bleed the whole system with confidence.

Part Numbers

Stock USA cylinders. "Repair Kits" are also available. These include all new rubber parts, and can be used if the aluminum body is not pitted. The bore is hand-honed. Often with aluminum a kit will leak, so we recommend a new unit rather than a kit. Cast-iron cylinders may have better success.

http://www.rockauto.com

Clutch Slave Cylinder

• RAYBESTOS SC37495 $12.44, ACDELCO 18F19 $14.56

Compare to B210:

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B210 clutch cylinder 5/8 inch. Fits:

Beck Arnley part number 072-6489

• 620 Pickup from 1972-3/76 <li>B210 (all models) from 1974-4/75 <li>SPL-311 (1600 or 2000) from 1966-70 <li>510 from 1968-73 (with Nabco master cylinder) <li>610 from 1973-75 (with Nabco master cylinder) <li>710 from 1973-75 </ul> Beck Arnley part 072-6521
  <li>74-75 B210 <li>76 F10 <li>72-76 <li>620 pickup <li>66-70 SPL-311 1600 <li>68-70 SPL-311 2000 <li>75-78 280Z <li>69-73 510 <li>78-81 510 <li>73-76 610 <li>74-77 710 <li>77-81 810

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  MASTER

  • 30610-24900 (superceded by 30610-24910). $111 USD

  
  SLAVE
  

  • Left: 30620-H1601 (superceded by 30620-H1600) $59 USD
  • Right: 30620-H1600

  
  HYDRAULIC HOSE
  The hose is difficult to find in USA, except on eBay. Alternatives: lot of the brake hoses from cars with a solid rear axel will work also:

  • Beck/Arnley 073-0879 (rear brake hose)
  • BRAKEWARE #77001 $12 at Autozone. It's about 1.5-2 inches longer then the original, does not hang to low and bolts right up

  RHD Hydraulic Conversion

  Hydraulic Clutch Master
  

  • Girling "claypipe" master cylinder, available in 5/8" and 3/4" bores (about $70 AUD). Threads are 3/8 unc for pipe outlet and 7/16 unc for fluid in

  
  

  • Nissan Urvan remote-fill tops
  • A simple 90-degree bracket is needed to be made up to mount this master cylinder

  
  Nissan Sentra Clutch Master Cylinder
  

  • Fluid reservoir is connected to the cylinder via a rubber hose.

  Remote Clutch Master Cylinder

  A remote clutch cylinder may also be useful

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  Photo Index

  Click each pic for large photo and discussion.

  

  • Cable-to-Hydraulic custom remote clutch m/c found on Mitsubishi LA Lancer