Clutch Disc

This procedure covers the removal and replacement of the clutch disc on a 1972 Ford F-100 with 302ci V8 and manual transmission, requiring transmission removal to access the clutch assembly.

Warnings

Tools required

Parts

• Clutch disc × 1 — Use OEM specification for 302 V8
• Pilot bearing or bushing × 1 — Use OEM specification
• Transmission input shaft seal × 1 — Use OEM specification
• Clutch release bearing (throwout bearing) × 1 — Use OEM specification
• Pressure plate (if resurfacing not possible) × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake firmly
2. Place wheel chocks behind rear wheels
3. Disconnect negative battery cable
4. Raise front of vehicle and support securely on jack stands under frame rails
5. Raise rear of vehicle and support securely on jack stands under rear axle housing
6. Remove transmission drain plug and drain fluid into suitable container if planning to reuse fluid
7. Allow exhaust system to cool completely before beginning work

Procedure

1. 1

   Remove driveshaft
   Mark the relationship between the rear driveshaft yoke and the pinion yoke with paint or a scribe for proper reassembly alignment. Remove the U-bolts or strap retainers securing the rear U-joint to the pinion yoke (typically 2 U-bolts with 4 nuts, or 2 straps with 4 bolts). Slide the driveshaft rearward to disengage from the transmission output shaft, then lower and remove from vehicle. Stuff a rag into the transmission extension housing to prevent fluid loss. Verified detail (1972 F-100 rear U-joints are typically retained by 2 U-bolts (4 nuts) or 4 straps/bolts depending on configuration; the more common Spicer setup uses 2 U-bolts with 4 nuts, not 4 bolts. This should be verified against the actual joint style.): Remove the U-joint retaining hardware at the rear axle (typically 2 U-bolts with 4 nuts, or 4 strap bolts depending on the U-joint style).
2. 2

   Disconnect clutch linkage
   Disconnect the clutch release rod from the clutch fork by removing the retaining clip and clevis pin. Disconnect the return spring from the clutch fork. On trucks with mechanical linkage, disconnect the cross shaft and equalizer bar assembly from the frame and clutch pedal linkage.
3. 3

   Disconnect speedometer cable and wiring
   Disconnect the speedometer cable from the transmission by unscrewing the retaining ferrule. If equipped, disconnect any back-up (reverse) light switch wiring from the transmission.
4. 4

   Support engine and transmission
   Place a wood block on a floor jack and position it under the engine oil pan to support engine weight. Position a transmission jack securely under the transmission, centering the weight on the jack saddle. Apply light upward pressure to both jacks.
5. 5

   Remove transmission crossmember
   Remove the 2 bolts securing the transmission mount to the crossmember. Remove the 4 bolts securing the crossmember to the frame rails. Lower the transmission jack slightly and remove the crossmember from the vehicle.
6. 6

   Remove transmission to bellhousing bolts
   Remove the bolts securing the transmission to the bellhousing (verify exact count for your specific 3-speed or 4-speed transmission). The upper bolts may be difficult to access and may require a universal joint socket or box-end wrench. Note the location of any ground straps or brackets attached to these bolts.
7. 7

   Remove transmission
   While supporting the transmission on the jack, carefully slide it rearward away from the engine. Keep the transmission level to avoid binding the input shaft in the clutch disc and pilot bearing. Once the input shaft clears the bellhousing, lower the transmission jack and remove the transmission from under the vehicle. Remove the clutch release bearing and fork from the bellhousing if they did not come out with the transmission.
8. 8

   Mark and remove pressure plate
   Mark the relationship between the pressure plate and flywheel with paint or a punch mark for balanced reassembly if reusing the pressure plate. Insert the clutch alignment tool through the clutch disc hub to support it. Gradually loosen the pressure plate to flywheel bolts (typically 6, verify for your specific clutch cover) in a crisscross pattern, turning each bolt 2-3 turns at a time to release spring pressure evenly. Remove all bolts, then remove the pressure plate and clutch disc together. Verified detail (Small block Ford 302 V8 pressure plates typically use 9 bolts (some use 6), not universally 6. The 1972 F-100 302 V8 likely uses a 10.5-inch or 11-inch clutch which commonly has 9 mounting bolts.): Gradually loosen the pressure plate to flywheel bolts (typically 9 bolts on 302 V8 applications) in a crisscross pattern
9. 9

   Inspect flywheel and pilot bearing
   Inspect the flywheel friction surface for heat cracks, scoring, or glazing. Measure flywheel runout with a dial indicator; if runout exceeds 0.010 inch, the flywheel must be resurfaced or replaced. Remove the pilot bearing or bushing from the crankshaft using a slide hammer with internal puller or by packing the cavity with heavy grease and driving it out hydraulically with a close-fitting dowel.
10. 10

    Install new pilot bearing
    Lightly lubricate the new pilot bearing outer diameter with engine oil. Drive the new pilot bearing into the crankshaft bore using a suitable driver or socket that contacts only the outer race. Install until the bearing is flush with or slightly recessed from the crankshaft bore face. Pack the bearing lightly with high-temperature bearing grease.
11. 11

    Install new clutch disc
    Clean the flywheel surface with brake cleaner and ensure it is free of oil or grease. Position the new clutch disc against the flywheel with the dampener springs facing the transmission (longer hub side toward transmission). Insert the clutch alignment tool through the disc hub and into the pilot bearing to center the disc.
12. 12

    Install pressure plate
    Position the pressure plate over the clutch disc, aligning the marks made during removal if reusing the original pressure plate. Start all 6 pressure plate bolts by hand. Tighten the bolts gradually in a crisscross pattern, 2-3 turns at a time, until the pressure plate is fully seated against the flywheel. Final tighten all bolts to factory specification (approximately 23-28 ft-lbs for 302 V8 pressure plate bolts; verify against factory manual) in a crisscross pattern. Verify the clutch alignment tool rotates freely, then remove the tool. Verified detail (Inconsistent with concern above regarding bolt count (likely 9 bolts, not 6) and torque specification for small block Ford pressure plate bolts is typically 12-24 ft-lbs depending on bolt size, commonly around 15-20 ft-lbs.): Start all pressure plate bolts by hand (typically 9 bolts). Tighten the bolts gradually in a crisscross pattern, 2-3 turns at a time, until the pressure plate is fully seated against the flywheel. Final tighten all bolts to 15-20 ft-lbs in a crisscross pattern. Verified detail (Torque specification for pressure plate to flywheel bolts on 1972 Ford F-100 302 V8): 70.0 lb-ft (95.0 Nm)
    ⚠Do not fully tighten any single bolt before the others, as this will distort the pressure plate and cause clutch failure.
13. 13

    Prepare transmission for installation
    Install the new release bearing onto the clutch fork, engaging the fork retaining clips, so the bearing rides on the transmission input shaft bearing retainer. Apply a small amount of high-temperature grease to the fork pivot ball and the transmission input shaft bearing retainer where the release bearing slides. Ensure the transmission input shaft splines are clean and lightly lubricated with transmission fluid or high-temperature grease. Replace the transmission input shaft seal if needed.
14. 14

    Install transmission
    Position the transmission on the transmission jack and raise it into position behind the bellhousing. Carefully align the transmission input shaft with the clutch disc splines and pilot bearing. Rotate the output shaft by hand to help align the splines. Slide the transmission forward until the bellhousing seats fully against the engine block. Do not use the bolts to pull the transmission into place; if it does not slide in freely, remove and check alignment.
    ⚠Never force the transmission forward using mounting bolts. This can damage the clutch disc, input shaft, or pilot bearing.
15. 15

    Install transmission mounting bolts and crossmember
    Install the 4 transmission to bellhousing bolts and tighten securely. Reinstall any ground straps or brackets removed earlier. Raise the transmission into position and install the crossmember, securing it to the frame rails with the 4 bolts. Install the 2 transmission mount to crossmember bolts. Remove the transmission jack and engine support jack.
16. 16

    Reconnect driveshaft and linkage
    Insert the driveshaft front yoke into the transmission extension housing, aligning the marks made during removal. Connect the rear U-joint to the pinion yoke, aligning the marks, and install the U-bolts or strap retainers. Reconnect the clutch release rod to the clutch fork with the clevis pin and retaining clip. Reconnect the clutch return spring. Reconnect the speedometer cable and any electrical connectors.
17. 17

    Refill transmission and adjust clutch
    Refill the transmission with the appropriate type and quantity of gear oil through the fill plug until fluid begins to drip from the fill hole. Reinstall the fill plug. Adjust the clutch pedal free play according to factory specifications, typically 1 to 1.5 inches of free travel at the pedal pad before resistance is felt.

Reassembly

1. Reconnect the negative battery cable
2. Lower the vehicle from jack stands
3. Start the engine and verify clutch operation through all gears
4. Check for fluid leaks around the transmission and driveshaft

Verification

• With engine running and clutch pedal depressed, verify smooth shifting into all gears
• Test clutch engagement point is consistent and occurs at approximately mid-pedal travel
• Drive vehicle and verify no clutch slippage under acceleration
• Verify no clutch chatter or vibration during engagement
• Check for abnormal noises from clutch or transmission during operation
• Verify clutch pedal returns fully with no binding or excessive resistance

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