Cylinder Head To Block Bolt 8-98201019-0 8982010190 8-97144583-2 8971445832 For ISUZU NKR NPR D-MAX 4JJ1 3.0L Diesel — OEM M11x114 Torque-to-Yield Bolt Set (18 PCS)

✅ Product Description

The Cylinder Head to Block Bolt with OEM numbers 8-98201019-0 (also listed as 8982010190) and 8-97144583-2 (also listed as 8971445832) is a verified OEM-grade direct replacement for ISUZU 4JJ1 3.0L diesel engines, commonly found in NKR, NPR, NLR85, NMR85, D-MAX, and TFR/TFS series trucks. These high-strength Torque-to-Yield (TTY) bolts are critical fasteners that secure the cylinder head to the engine block, maintaining the combustion seal under extreme pressure and thermal cycling.

Manufactured to ISUZU's stringent OEM specifications, this cylinder head bolt set is engineered from high-strength alloy steel with a M11×114mm thread and integrated washer design. The bolts are designed to stretch slightly when torqued to specification, providing uniform clamping force across the entire cylinder head gasket surface.

⚠️ CRITICAL: TTY bolts are single-use components. ISUZU service manuals explicitly mandate that cylinder head bolts must be replaced with new ones whenever the cylinder head is removed. Reusing old TTY bolts can lead to insufficient clamping force, head gasket failure, and catastrophic engine damage.

• ✅ OEM Specification — Verified by ISUZU OEM part numbers 8-98201019-0, 8982010190, 8-97144583-2, 8971445832.

• ✅ Precision M11×114 Dimensions — Verified by multiple parts catalogs and supplier specifications: Thread M11, Length 114mm, Thread Pitch 1.5mm, Quantity 18 per set.

• ✅ Proven Durability — Manufactured from high-strength alloy steel with Male Hex head design and integrated plain washer — designed for single-use TTY application.

• ✅ OEM Cross-Reference Verified — Replaces 8-97144583-0, 8971445830, 8-97144583-1, 8971445831, 8-97144583-2, 8971445832, 8-98201019-0, 8982010190, OPEL 56 07 451.

• ✅ Complete Set of 18 — Supplied as a complete set of 18 bolts (sufficient for one 4-cylinder 4JJ1 engine).

[Failure Symptoms]
If your cylinder head bolts are failing or have been reused improperly, you may experience one or more of the following symptoms:

1. Head Gasket Failure: Coolant or oil leaks from the head-to-block mating surface — indicates insufficient clamping force from stretched or reused bolts.

2. Engine Overheating: Temperature gauge rising above normal — combustion gases entering the cooling system through a compromised head gasket seal.

3. White Smoke from Exhaust: Steam-like white smoke indicating coolant entering the combustion chamber.

4. Loss of Engine Compression: Rough running, misfires, or hard starting — combustion pressure escaping past a failed head gasket.

5. Milky Oil: Coolant contamination in the engine oil — indicates head gasket failure.

6. Bolt Stretching or Breakage: Visible deformation or breakage of bolts — indicates reuse of TTY bolts beyond their elastic limit.

⚠️ Reusing TTY head bolts or using low-quality replacements can lead to head gasket failure and catastrophic engine damage — always use new OEM-specification bolts and follow the correct torque sequence and angular tightening procedure.

✅ Vehicle & Engine Compatibility

Primary Applications — ISUZU Trucks:

Primary Applications — Construction Equipment:

Cross-Brand Applications:

⚠️ Important:

• This cylinder head bolt set is designed for ISUZU 4JJ1 series 3.0L diesel engines only — verify your engine code before ordering.

• Quantity Required: 18 bolts per engine (4-cylinder 4JJ1).

• CRITICAL: TTY bolts are single-use components — must be replaced whenever the cylinder head is removed.

• Also compatible with Holden Colorado/Rodeo models equipped with 4JJ1 engines.

• Please verify your vehicle's chassis code, production year, and engine code before ordering.

✅ Features & Benefits

✅ Quality Control & Verification

Our manufacturing and inspection processes ensure every cylinder head bolt meets or exceeds ISUZU OEM standards.

✅ Installation & Maintenance Recommendations

⚠️ IMPORTANT: Professional Installation Highly Recommended

Cylinder head bolt installation requires precision torque equipment, adherence to the correct tightening sequence, and expert knowledge of TTY bolt procedures.

Pre-Installation Checklist:

• CRITICAL: These are TTY (Torque-to-Yield) bolts — they are single-use components and must be replaced whenever the cylinder head is removed. Never reuse old TTY bolts.

• Quantity Required: 18 bolts per engine (4-cylinder 4JJ1).

• Inspect the cylinder head and engine block sealing surfaces for warpage or damage — resurface if necessary.

• Clean all bolt holes in the engine block thoroughly — any debris or oil in the bolt holes can cause false torque readings and insufficient clamping force.

• Apply molybdenum disulfide grease to the screw threads and seat of each cylinder head bolt (as specified in ISUZU workshop manual).

• Use a calibrated torque wrench and angle gauge for proper tightening.

Installation Guidelines (Reference ISUZU workshop manual):

1. Ensure the engine is completely disassembled with the cylinder head removed.

2. Clean the cylinder head and engine block sealing surfaces thoroughly.

3. Position the new cylinder head gasket correctly — ensure the correct thickness (1-notch, 2-notch, or 3-notch) is selected based on piston protrusion measurement.

4. Install the cylinder head onto the gasket.

5. CRITICAL: Apply molybdenum disulfide grease to the screw threads and seat of each bolt.

6. Install the 18 new cylinder head bolts and hand-tighten.

7. CRITICAL: Tighten in three steps following the numerical sequence specified in the ISUZU workshop manual:

   • Step 1: Torque to 49 N·m (5.0 kgf·m / 36 lb·ft)

   • Step 2: Additional 60°–75° angular tightening

   • Step 3: Additional 60°–75° angular tightening

8. CRITICAL: Do not re-torque the bolts after the final angular step.

9. Reassemble remaining engine components.

10. Refill with fresh coolant and engine oil.

11. Start the engine and check for leaks.

12. Perform a cooling system pressure test to verify seal integrity.

Maintenance Schedule:

• Inspection: During engine overhauls or if head gasket failure symptoms appear.

• Replacement: Mandatory whenever the cylinder head is removed or if any bolt shows signs of stretching, deformation, or thread damage.

• Note: Always use new TTY bolts and follow the correct torque sequence and angular tightening procedure. Reusing TTY bolts or using low-quality replacements can lead to head gasket failure and catastrophic engine damage.

✅ Packaging & Supply

• Packaging: Each set of 18 bolts is securely packed in a protective box to prevent shipping damage.

• Set Contents: 18 PCS per set (sufficient for one 4-cylinder 4JJ1 engine).

• Net Weight (Set): Approx. 1.709 kg (1709 g).

• Suitable for: Wholesale distributors, engine rebuild shops, truck repair facilities, construction equipment service centers, and fleet owners.