Clutch Pressure Plate 1-31220147-1 / 8-94461108-0 For ISUZU 6BG1 6HE1 FORWARD — Ø300 Mm, 12 Kg, EXEDY ISC549 Equivalent, OEM-Spec

1-31220147-1 8-94461108-0 1312201471 8944611080 Clutch Pressure Plate for ISUZU 6BG1 6HE1 FORWARD — 300×190×350 mm, 12 kg, Cast Iron/Steel, EXEDY ISC549 Cross-Ref

✅ Product Description

The Clutch Pressure Plate (Clutch Cover) with OEM references 1-31220147-1 / 8-94461108-0 (and condensed forms 1312201471 / 8944611080) is a verified replacement clutch cover for ISUZU 6BG1 and 6HE1 diesel engines used in the ISUZU FORWARD medium-duty truck platform. This is the push-type diaphragm spring pressure plate that clamps the clutch disc against the flywheel, transmitting engine torque to the gearbox and releasing it when the pedal is depressed.

The pressure plate is defined by its 300 mm outside diameter, 190 mm inner diameter, and 350 mm pitch circle diameter (PCD) — the critical dimensional set for matching the flywheel bolt pattern and clutch disc friction radius on the 6BG1/6HE1 FORWARD application. It is manufactured from cast iron and steel (cast iron body with a steel diaphragm spring and cover), with a reference net weight of 12 kg. The unit is supplied under the IZUMI brand, a recognized aftermarket supplier of Japanese commercial vehicle parts, and is confirmed compatible with the EXEDY ISC549 reference.

Key Selection Boundaries — Ø300 mm Diameter Set, Cast Iron/Steel Construction, and FORWARD Platform Compatibility

1. Ø300 mm / 190 mm / 350 mm PCD Dimensional Set
   The 300 mm outside diameter, 190 mm inner diameter, and 350 mm PCD are the defining dimensional specifications. A different diameter set will not bolt to the flywheel correctly or match the clutch disc friction radius. One source lists an inner diameter of 180 mm or 188 mm for the same OE family — this is a measurement tolerance or a variant difference. Confirm the original pressure plate’s measured dimensions before ordering.

2. Cast Iron / Steel Construction
   The pressure plate uses a cast iron pressure plate with a steel cover and connecting straps. This construction provides the clamping force and heat resistance required for the 6BG1/6HE1 diesel torque output.

3. FORWARD Platform (6BG1 / 6HE1)
   The pressure plate is confirmed for ISUZU FORWARD applications with the 6BG1 and 6HE1 engines, including P-FRD12 (6BG1) and P-FSR12 (6BG1) models. Confirm the chassis code and VIN before ordering, especially for fleet applications with mixed FORWARD variants.

✅ Verifiable Signal Reinforcement

• ✅ OE Reference & Engine Coverage Verified: 1-31220147-1 / 8-94461108-0 — confirmed for ISUZU 6BG1 / 6HE1 across multiple independent supplier catalogs.

• ✅ Dimensional Set Verified: Outside Diameter 300 mm / Inner Diameter 190 mm / PCD 350 mm — confirmed by ZHEJIANG OEEMM and HB-AOFENG technical listings. Alternate inner diameter references of 180 mm and 188 mm exist for the same OE family — confirm measured dimensions against the original unit.

• ✅ Weight Verified: 12 kg — confirmed by technical product data for the 1312201471 / ISC549 reference.

• ✅ Material Verified: Cast Iron (pressure plate) + Steel (cover/straps) — confirmed by technical product specification.

• ✅ Brand & Purpose Verified: IZUMI brand; OEM Replacement / Repair — confirmed by supplier data.

• ✅ Cross-Reference Density Verified: 1-31220147-1, 8-94461108-0, 1312201471, 8944611080, 8-94461-108-0, 1-31220-147-1 are consistently grouped as interchangeable or related references across multiple catalogs.

• ✅ EXEDY Cross-Reference Verified: EXEDY ISC549 — confirmed as the equivalent EXEDY reference for the 1312201471 application.

• ✅ Aftermarket Brand Cross-Reference Verified: Blue Print ADZ93221N — confirmed as an aftermarket cross-reference for 8-94461-108-0.

• ✅ Vehicle Coverage Verified: ISUZU FORWARD P-FRD12 (6BG1) and P-FSR12 (6BG1) — confirmed by dimensional data listings. Additional FORWARD coverage includes KC-FRR32 (6HE1) and U-FSR32 (6HE1T) via related part numbers.

• ⚠️ Clutch Disc and Release Bearing NOT Included: This listing covers the pressure plate only. The clutch disc and release bearing are separately supplied. For a complete clutch replacement, order pressure plate, disc, and release bearing as a matched set. Confirm companion part numbers at inquiry.

✅ Failure Symptoms — When to Replace

• Clutch slips under load: Engine RPM rises without a corresponding vehicle speed increase, especially on inclines or under acceleration — the pressure plate diaphragm spring has lost clamping force.

• Hard or high pedal engagement: The diaphragm fingers are worn or the release mechanism is binding, requiring excessive pedal effort or a very high engagement point.

• Chatter or judder during engagement: Uneven pressure plate friction surface wear or a warped diaphragm spring causes vibration when the clutch is engaged from a stop.

• Clutch drag / difficulty selecting gears: A distorted or cracked pressure plate can prevent full clutch disengagement, causing gear clash and hard shifting.

• Burning smell after normal driving: A slipping pressure plate generates excessive heat, producing a persistent burning odor even without aggressive driving.

• Visible cracks, heat discoloration, or worn friction surface: Direct inspection during gearbox removal reveals the condition — any cracking or blue heat marks indicate replacement is required.

Consequence of Ignoring Symptoms
A failing pressure plate can progress from slipping to complete loss of torque transmission, leaving the vehicle unable to move. Continued driving with a slipping clutch generates extreme heat that can warp the flywheel, damage the release bearing, and contaminate the clutch disc, turning a pressure plate replacement into a complete clutch and flywheel service.

• ✅ Vehicle & Engine Compatibility

  
  

  
  

  Brand	Model / Series	Engine Reference	Notes
  ISUZU	FORWARD P-FRD12	6BG1	Core application, confirmed by dimensional data listings
  ISUZU	FORWARD P-FSR12	6BG1	Core application, confirmed by dimensional data listings
  ISUZU	FORWARD KC-FRR32	6HE1	Related FORWARD coverage via companion part number (1-31220-207-1)
  ISUZU	FORWARD U-FSR32	6HE1T	Related FORWARD coverage via companion part number (1-31220-294-0)

  Important Fitment Notes

  • Dimensional set is the first check: This pressure plate is Ø300 mm outside / 190 mm inside / 350 mm PCD. Alternate inner diameter references of 180 mm and 188 mm exist for the same OE family. Measure the original pressure plate or confirm the exact variant before ordering.

  • Push-type actuation confirmed: This is a push-type diaphragm spring cover. Do not substitute a pull-type unit.

  • FORWARD platform coverage: Core applications are P-FRD12 and P-FSR12 with the 6BG1 engine. Related FORWARD models with the 6HE1/6HE1T use companion part numbers. Provide the VIN for final confirmation in mixed-fleet applications.

  • Clutch disc and release bearing are separate: For a complete clutch job, order the matched disc and release bearing separately. Confirm companion part numbers at inquiry.

  ✅ Features & Benefits

  
  

  
  

  Feature	Benefit + Verification Signal
  Ø300 mm / 190 mm / 350 mm PCD dimensional set	Matches the 6BG1/6HE1 FORWARD flywheel bolt pattern and clutch disc friction radius — verified across multiple independent technical listings.
  Cast iron pressure plate + steel cover	Provides the clamping force, heat resistance, and structural rigidity required for medium-duty diesel torque output — confirmed by material specification.
  12 kg reference weight	Consistent with an OE-specification clutch cover for the 6BG1/6HE1 application — confirmed by technical product data.
  IZUMI brand quality	IZUMI is a recognized aftermarket supplier of Japanese commercial vehicle parts, providing a cost-effective OEM replacement alternative.
  EXEDY ISC549 cross-reference	Provides a verified aftermarket alternative with a Japanese brand quality baseline when the primary OE reference is constrained.
  Dense OE cross-reference coverage	1312201471, 8944611080, 8-94461-108-0, 1-31220-147-1 provide multiple verifiable sourcing paths.
  12-month / 30,000 km warranty reference	Provides a clear after-sales baseline for a wear-prone driveline component.

  ✅ Quality Control & Verification

  
  

  
  

  QC Item	Verification Method
  Outside diameter	Precision gauge — verify 300 mm
  Inner diameter	Gauge — verify 190 mm (confirm against original if 180/188 mm variant suspected)
  PCD	Gauge — verify 350 mm
  Diaphragm spring finger height and wear	Visual and height gauge inspection
  Pressure plate surface flatness	Straight-edge and visual inspection for heat cracks, scoring, or warping
  Release bearing interface	Confirm the pressure plate accepts the original release bearing (bearing not included)
  Clutch disc compatibility	Confirm the cover matches the disc friction radius and spline configuration
  Material integrity	Visual inspection for casting porosity or cracks
  Weight consistency	Batch weighing — 12 kg reference
  Reference marking	Verify 1-31220147-1 / 8-94461108-0 or IZUMI branding where present

  Because inner diameter references vary (180/188/190 mm), and the clutch disc/release bearing are not included, confirming the measured dimensions and interface on the first sample is mandatory before bulk commitment.

  ✅ Installation & Maintenance Recommendations

  IMPORTANT: Clutch replacement requires gearbox removal and precision alignment. Always refer to the ISUZU FORWARD workshop manual for the specific model. Improper installation can result in clutch drag, premature release bearing failure, or flywheel damage. Professional driveline installation is strongly recommended.

  Installation Guidelines — Reference Only

  1. Confirm the required components first: Verify the pressure plate dimensions (300/190/350 mm) against the original. Confirm the clutch disc and release bearing references match the transmission fitted to the vehicle.

  2. Inspect the flywheel: Before installing the new pressure plate, check the flywheel friction surface for cracks, heat discoloration, or warping. A damaged flywheel must be resurfaced or replaced — installing a new pressure plate against a worn flywheel causes chatter and premature failure.

  3. Clean and align: Clean the flywheel bolt holes and the pressure plate mounting surface. Use a clutch alignment tool to center the disc against the flywheel before tightening the pressure plate bolts.

  4. Torque in sequence: Tighten the pressure plate bolts evenly in a cross pattern to the workshop manual specification. Uneven tightening distorts the diaphragm spring and causes clutch drag or incomplete release.

  5. Check release bearing and fork: Inspect the release bearing, fork, and pivot for wear. Replace the release bearing as a matter of course during clutch service — reusing an old bearing with a new pressure plate is a false economy.

  6. Verify clutch release and engagement: After reassembly, check that the clutch fully disengages (no drag with the pedal depressed) and engages smoothly without chatter.

  7. Road test: Drive the vehicle through a range of load conditions, confirming no slip under acceleration and smooth engagement from a stop.

  Maintenance Schedule

  • Avoid resting your foot on the clutch pedal while driving — this causes continuous release bearing contact and premature wear.

  • Do not slip the clutch excessively on inclines or when towing — excessive heat accelerates pressure plate diaphragm fatigue and flywheel damage.

  • Inspect the clutch system at every major service or if pedal feel changes — slipping, chatter, or a high engagement point are early warning signs.

  • Replace the pressure plate, disc, and release bearing as a set when any one component fails — mixing new and worn components leads to repeat labor and uneven wear.

  ✅ Packaging & Supply

  • Standard packing: Export carton / neutral packaging / customer-branded packaging available. Bulk export pallet available.

  • Package contents: 1 × Clutch Pressure Plate. Clutch disc and release bearing are NOT included unless explicitly stated — confirm exact package contents at inquiry.

  • Set options: Pressure plate only (standard) / complete clutch kit (pressure plate + disc + release bearing) — specify at inquiry.

  • Suitable for: ISUZU FORWARD clutch and gearbox repair shops, medium-duty commercial truck fleet maintenance departments, driveline rebuilders, spare parts distributors, and export wholesalers.