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8971334161 Cylinder Head Bolt For ISUZU NKR TFR UCS Trucks With 4JB1 4JA1 Engine
Direct replacement cylinder head bolt set for ISUZU NKR, TFR, and UCS trucks and pickups OE cross reference: 8942473559, 8971334160, 8971334161, 8944556670, 8-94247355-9, 8-97133416-0, 8-97133416-1, 8-94455667-0, 1334161-11 Compatible with 4JB1 and 4JA1 diesel engines Choose from 3 quality levels – China ISUZU (Qingling) Quality / Aftermarket Quality / Famous Brand Quality Critical engine component – Provides proper clamping force for head gasket sealing MOQ: 1 set (complete set)
Description
Products Description
The Cylinder Head Bolt (also known as head bolt or cylinder head fastener) is one of the most critical fasteners in your ISUZU diesel engine. These high-tensile bolts provide the essential clamping force that secures the cylinder head to the engine block, maintaining a tight seal of the head gasket under extreme combustion pressures.
This cylinder head bolt set is specifically designed for ISUZU NKR, TFR, and UCS series vehicles powered by the legendary 4JB1 (2.8L diesel) and 4JA1 (2.5L diesel) engines – widely regarded as some of the most reliable and long-lasting diesel engines ever produced .
OE cross reference: 8942473559, 8971334160, 8971334161, 8944556670, 8-94247355-9, 8-97133416-0, 8-97133416-1, 8-94455667-0, 1334161-11
Available in three quality tiers:China ISUZU (Qingling) Quality / Aftermarket Quality / Famous Brand Quality for choose.
Products Specifications
| Parameter | Specification |
|---|---|
| Product Name | Cylinder Head Bolt Set / Head Bolt / Cylinder Head Fastener |
| OE Numbers | 8942473559, 8971334160, 8971334161, 8944556670, 8-94247355-9, 8-97133416-0, 8-97133416-1, 8-94455667-0, 1334161-11 |
| Quality Options | China ISUZU (Qingling) Quality / Aftermarket Quality / Famous Brand Quality |
| Material | High-tensile alloy steel (heat-treated) |
| Bolt Type | Standard (reusable check) or Torque-to-Yield (TTY) – verify by application |
| Tensile Strength | 10.9 or 12.9 grade (dependent on quality tier) |
| Compatible Engines | ISUZU 4JB1 (2.8L diesel), 4JA1 (2.5L diesel) |
| Compatible Models | ISUZU NKR, TFR, UCS; also fits NHR, NKR, TFS, UBS |
| Set Quantity | Complete set for one cylinder head (quantity as per factory spec) |
| Thread Lubrication | Engine oil on threads and under-head surfaces (per factory spec) |
| H/S Code | 7318159000 |
| MOQ | 1 set |
| Warranty | 1 Year |
Cylinder Head Bolt Torque Specifications (Reference)
The following torque specifications are provided for reference. Always consult your vehicle's factory service manual for exact specifications as variations exist between engine variants .
4JA1 / 4JB1 Cylinder Head Bolt Torque
| Step | Specification (New Bolts) | Notes |
|---|---|---|
| Step 1 | 3.0 – 5.0 kg·m (21.7–36.1 ft-lbs / 29.4–49.0 N·m) | Tighten in sequence from center outward |
| Step 2 | 8.0 – 9.0 kg·m (57.9–65.1 ft-lbs / 78.4–88.2 N·m) | Tighten in sequence |
| Final Check | 9.0 – 10.0 kg·m (65.1–72.4 ft-lbs / 88.2–98.1 N·m) | Final verification pull |
Related products
Signs of Needs Replacement
Signs Your Crankshaft Position Sensor Needs Replacement
| Symptom | What It Means |
|---|---|
| Blown head gasket | Failed bolt clamping force is a common cause of head gasket failure |
| Coolant in oil (milky oil) | Head gasket seal compromised – oil and coolant mixing |
| Oil in coolant (brown sludge) | Coolant contaminated with engine oil |
| Pressurized cooling system | Combustion gases entering cooling system through failed gasket |
| White exhaust smoke / sweet smell | Coolant burning in combustion chambers |
| Engine overheating without apparent cause | Coolant loss or combustion gas intrusion |
| Loss of compression | Head gasket unable to seal combustion chambers |
| Visible coolant loss without external leak | Coolant entering cylinders or oil passages |
Why choose us?
Why choose us?
✅ 3 Quality options on one page – Compare and choose based on your budget and reliability needs.
✅ 29 Years Experience – Truck parts supplier from China ,focus on Isuzu truck parts for 20 years.
✅ China ISUZU Quality available – Genuine-grade for maximum dependability
✅ Low MOQ (1 piece) – Perfect for sample testing or emergency replacement
✅ Fast delivery – 1–8 working days worldwide
✅ Exact fit guarantee – Verified against OE dimensions
✅ 1-year warranty – Peace of mind on every order
✅ Bulk discounts available – Contact us for fleet and wholesale pricing
FAQ
Q1: Can I reuse old cylinder head bolts on my 4JB1 or 4JA1 engine?
A: It depends on the bolt type. Some 4J series diesel engines use conventional bolts that can be reused if they measure within spec and threads are perfect. However, many professionals replace head bolts regardless as cheap insurance. Torque-to-yield (TTY) bolts – common on some 4J variants – must be replaced as they permanently stretch during initial tightening.
Q2: How many bolts are in a complete set?
A: A complete cylinder head bolt set includes all bolts required for one cylinder head. For the 4JB1 and 4JA1 engines, this is typically 10 bolts (4-cylinder diesel configuration). All listed OE numbers represent complete sets.
Q3: What does "China ISUZU (Qingling) Quality" mean?
A: Qingling Motors is ISUZU's long-term joint venture partner in China, producing ISUZU-licensed commercial vehicles since 1985. China ISUZU Quality parts are manufactured to the same specifications as original equipment supplied to ISUZU's China production lines – including the popular 4JB1-powered trucks sold globally.
Q4: Will this fit my TFR with the 4JB1-T (turbo) engine?
A: Yes. This cylinder head bolt set is compatible with both naturally aspirated and turbocharged variants of the 4JB1 engine, including 4JB1-T and 4JB1-TC.
Q5: Do I need to replace the head gasket at the same time?
A: Yes. Cylinder head bolts are typically replaced as part of a head gasket repair. The head gasket cannot be reused once compressed. You will also need to ensure the correct gasket thickness is selected based on piston projection measurement.
Q6: What is the difference between OE numbers 8942473559, 8971334160, 8971334161, and 8944556670?
A: These are different part number formats or slight variants for the same cylinder head bolt set across different markets and production years. All are interchangeable for the 4JB1/4JA1 engine applications. Some listings cross-reference all these numbers as equivalent.
Q7: Do I need to use thread lubricant?
A: Yes. The ISUZU factory service manual specifies applying a coat of engine oil to cylinder head bolt threads and under-head seating surfaces before installation. Dry torque and lubricated torque produce different clamp loads.
Q8: Do you offer wholesale pricing for bulk orders?
A: Yes. Please contact us with your quantity and preferred quality level for a competitive quote.
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