Honda S2000 Clutch

Honda S2000

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DELAY ORIFICE MECHANISM - Honda S2000 2004 MODEL

The delay orifice mechanism improves clutch operation by delaying the slave cylinder release speed when the clutch pedal is suddenly released. The delay orifice mechanism is built into the slave cylinder. See Figure.

When the clutch pedal is pressed, the fluid pressure from the master cylinder moves the one-way valve in the direction shown in the illustration. The fluid flows through two passages: the orifice part and the filter part. It then flows out to the slave cylinder to release the pressure plate and clutch disc joint. See Figure.

When the clutch pedal is released, the fluid pressure from the slave cylinder moves the one-way valve in the direction shown in the illustration. The one-way valve blocks the filter-part passage and delays the clutch release speed by returning the fluid to the master cylinder through only the orifice-part passage. See Figure.

CLUTCH PEDAL, CLUTCH PEDAL POSITION SWITCH, AND CLUTCH INTERLOCK SWITCH ADJUSTMENT

Check the clutch pedal position switch.
Check the clutch interlock switch.
The clutch is self-adjusting to compensate for wear.
If there is no clearance between the master cylinder piston and pushrod. The release bearing will be held against the diaphragm spring, which can result in clutch slippage or other clutch problems.

1. Loosen the locknut, and back off the clutch switch until it no longer touches the clutch pedal. See Figure.
2. Loosen the locknut, and turn the pushrod in or out to get the specified height and stroke at the clutch pedal.

Clutch Pedal Stroke: 115-125 mm (4.53-4.92 in.)
Clutch Pedal Height: 189 mm (7.44 in.)

3. Tighten the locknut .
4. With the clutch pedal released, turn in the clutch pedal position switch until it contacts the clutch pedal.
5. Turn in the clutch pedal position switc an additional 3/4 to 1 turn.
6. Tighten the locknut.
7. Loosen the locknut and the clutch interlock switch.
8. Press the clutch pedal to the floor.
9. Release the clutch pedal 15-20 mm (0.59-0.79 in.) from the fully pressed position, and hold it there. Adjust the position of the clutch interlock switch so the engine will start with the clutch pedal in this position.
10. Tighten the locknut.

CLUTCH MASTER CYLINDER REPLACEMENT

Do not spill brake fluid on the vehicle; it may damage the paint; if brake fluid does contact the paint, wash it off immediately with water.

1. The brake fluid may be sucked out through the top of the master cylinder reservo with a syringe. See figure.
2. Disconnect the clutch line from the clutch master cylinder. Plug the end of the clutch line and reservoir hose with a shop towel to prevent brake fluid from coming out.
3. Pry out the lock pin, and pull the pedal p out of the yoke. Remove the master cylinder mounting nuts. See figure.
4. Remove the clutch master cylinder. See figure.
5. Install the clutch master cylinder in the reverse order of removal. Tighten the master cylinder mounting nuts to 13 N.m (1.3 kgf.m, 9.4 lbf.ft).
6. Bleed the clutch hydraulic system
7. Refill the brake fluid in the reservoir at the MAX (upper) level line.

SLAVE CYLINDER REPLACEMENT

Do not spill brake fluid on the vehicle; it may damage the paint; if brake fluid does contact the paint, wash it off immediately with water.

1. Remove the banjo bolt and washers, then disconnect the clutch hose from the slave cylinder. Plug the end of the clutch hose with a shop towel to prevent brake fluid from coming out. See figure for S2000 2000-2003 model. See figure for S2000 2004 model.
2. Remove the two bolts and slave cylinder.
3. Pull back the boot, and apply brake assembly lube or equivalent rubber grease to the boot and slave cylinder rod. Reinstall the boot. See figure.
4. Apply super high temp urea grease (PN 08798-9002) to the tip of the slave cylinder rod.
5. Install the slave cylinder in the reverse order of removal. Use new banjo bolt washers. Make sure the boot is installed on the slave cylinder. See figure for S2000 2000-2003 model. See figure for S2000 2004 model.
6. Bleed the clutch hydraulic system.

Attach a hose to the bleeder screw, and suspend the hose in a container of brake fluid.
Make sure there is an adequate supply of fluid at the clutch master cylinder, then slowly pump the clutch pedal until no more bubbles appear at the bleeder hose.
Tighten the bleeder screw to 9.8 N.m (1.0 kgf.m, 7.2 lbf.ft); do not overtighten it.
Refill the clutch master cylinder with fluid when done.
Use only Honda DOT 3 brake fluid from an unopened container.
Confirm clutch operation, and check for leaking fluid. See figure for S2000 2000-2003. See figure S2000 20004 model.

7. Make sure the fluid level in the reservoir is at the MAX (upper) level line. See figure.

CLUTCH REPLACEMENT

SPECIAL TOOLS NEEDED

Clutch alignment shaft 07LAF-PT00110
Remover handle 07936-3710100
Ring gear holder 07LAB-PV00100 or 07924-PD20003
Driver 07749-0010000
Attachment, 32 x 37 mm 07746-0010200

Pressure Plate and Clutch Disc Removal

1. Check the height-variation of the diaphragm spring fingers using the dial indicator. If the variation is more than the service limit, replace the pressure plate. See figure.

Standard (New): 0.4 mm (0.016 in.) max.
Service Limit: 0.6 mm (0.024 in.)

2. Install the special tools. See figure.
3. To prevent warping, unscrew the pressure plate mounting bolts in a crisscross pattern in several steps, then remove the pressure plate.
4. Remove the release bearing from the pressure plate.
5. Inspect the fingers of the diaphragm spring for wear at the release bearing contact area. See figure.
6. Inspect the surface of the pressure plate for wear, cracks, and burning.
7. Inspect for warpage using a straight edge and feeler gauge. Measure across the pressure plate. If the warpage is more than the service limit, replace the pressure plate. See figure.

Standard (New): 0.03 mm (0.001 in.) max.
Service Limit: 0.15 mm (0.006 in.)

8. Remove the clutch disc and special tools. See figure.
9. Inspect the lining of the clutch disc for signs of slippage or oil. If the clutch disc looks burnt or is soaked with oil, replace it. Find the source of the oil leak if the clutch disc is soaked.
10. Measure the clutch disc thickness. If the thickness is less than the service limit, replace the clutch disc. See figure.

Standard (New): 8.2-8.9 mm (0.32-0.35 in.)
Service Limit: 6.0 mm (0.24 in.)

11. Measure the rivet depth from the clutch disc lining surface to the rivets, on both sides. If the rivet depth is less than the service limit, replace the clutch disc. See figure 1 of 2. See figure 2 of 2.

Standard (New): 1.2-1.7 mm (0.047-0.067 in.)
Service Limit: 0.2 mm (0.008 in.)

Flywheel Inspection

1. Inspect the ring gear teeth for wear and damage.
2. Inspect the clutch disc mating surface on the flywheel for wear, cracks, and burning.
3. Measure the flywheel runout using a dial indicator through at least two full turns with the engine installed. Push against the flywheel each time you turn it to take up the crankshaft thrust washer clearance. If the runout is more than the service limit, replace the flywheel, and recheck the runout. Resurfacing the flywheel is not recommended. See figure.

Standard (New): 0.05 mm (0.002 in.) max.
Service Limit: 0.15 mm (0.24 in.)

4. Turn the inner race of the ball bearing with your finger. The ball bearing should turn smoothly and quietly. Check that the ball bearing outer race fits tightly in the flywheel. If the race does not turn smoothly, quietly, or fit tight in the flywheel, replace the ball bearing. See figure.

Flywheel Replacement

1. Install the special tool. See figure.
2. Remove the flywheel mounting bolts in a crisscross pattern in several steps, then remove the flywheel.
3. Remove the ball bearing from the flywheel. See figure.
4. Drive the new ball bearing into the flywheel using the special tools as shown. Apply a light coat of oil to the bearing surface. See figure.
5. Align the hole in the flywheel with the crankshaft dowel pin, and install the flywheel. Install the washer and mounting bolts, finger-tight.
6. Install the special tool, then torque the flywheel mounting bolts in a crisscross pattern in several steps. See figure.

Release Bearing Inspection

Check the play of the release bearing by spinning it with your hand, if there is excessive play, replace the release bearing with a new one. See figure.

The release bearing is packed with grease. Do not wash it in solvent.

Clutch Disc and Pressure Plate Installation

1. Apply a thin, uniform coat of super high temp urea grease (PN 08798-9002) to the splines of the clutch disc. Slide the clutch disc onto the mainshaft, and remove extra overflow grease.
2. Install the ring gear holder. See figure.
3. Install the clutch disc using the special tools.
4. Apply super high temp urea grease (PN 08798-9002) into the groove of the release bearing, then install the release bearing on the pressure plate. See figure.
5. Install the pressure plate and the mounting bolts, finger-tight. Make sure the release bearing does not come off.
6. Torque the mounting bolts in a crisscross pattern. Tighten the bolts in several steps to prevent warping the diaphragm spring. See figure.

PRESSURE PLATE MOUNTING BOLT TORQUE: 25 N.m (2.6 kgf.m, 19 lbf.ft)

7. Remove the special tools.
8. Make sure the diaphragm spring fingers are all the same height.

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Honda S2000 AP1

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