Oil Filter Assembly 8-97239978-1 8972399781 For ISUZU 4KH1 4KH1-TC 4JH1-TC 600P NKR77 ELF — OEM Verified JLQ 60A Assembly With Integrated Oil Cooler, ISO/TS16949

8-97239978-1 8972399781 Oil Filter Assembly JLQ 60A for ISUZU 4KH1 4KH1-TC 4JH1-TC NKR77 G5 600P ELF — Integrated Oil Cooler Module, Filter Element 1012011-803B1/QL139, ISO/TS16949

✅ Product Description

The Oil Filter Assembly with OEM references 8-97239978-1 / 8972399781 is a verified direct-fit replacement for ISUZU 4KH1, 4KH1-TC, and 4JH1-TC diesel engines, used across NKR77, G5, 600P, ELF, NPR, and NLR/NMR commercial truck platforms. This is not a simple spin-on filter — it is a complete oil filter assembly (JLQ 60A) that combines the oil filter element housing with an integrated oil cooler module, responsible for both filtering microscopic metal particles, carbon deposits, and soot from the engine oil and stabilizing oil temperature to prevent oil dilution and maintain optimal viscosity.-4

The assembly is cataloged under the JLQ 60A product designation and is supplied with a premium filter element (OE reference 1012011-803B1 / QL139) inside a high-quality spin-on steel housing. It is manufactured under ISO/TS16949 quality management and is offered in multiple quality tiers including Chinese ISUZU quality and Japanese ISUZU quality.-1-4

• ✅ Assembly Configuration Verified: Confirmed as JLQ 60A Oil Filter Assembly with integrated oil cooler module, combining a premium filter element (OE 1012011-803B1 / QL139) with a durable oil cooler housing.-4

• ✅ Engine Coverage Verified: Confirmed for 4KH1-TC / 4JH1-TC diesel engines across ISUZU NKR77, G5, 600P, ELF100 (Mexico), NPR/NQR (4JH1/4JH1TC), and NLR/NMR (4JH1TC) applications from 1999 onward.-23

• ✅ OEM Cross-Reference Verified: Confirmed across 8972399780, 8972399781, 8972399782, 8-97239978-0, 8-97239978-1, 8-97239978-2, and filter element 1012011-803B1 / QL139.-4

• ✅ Certification Verified: ISO/TS16949 — confirmed by multiple supplier listings for this assembly.-1-11

• ✅ Warranty & MOQ Verified: 1-year warranty (reference) and MOQ 1 set/1 box — confirmed by GLQ and BZLP supplier data.-1-4

• ✅ Supply Capacity Verified: 10,000 sets/month — confirmed by multiple supplier listings.-1-11

• ✅ Packaging Verified: Plastic bag + color box + carton; neutral packaging or customer-branded packaging available.-1-4

• ⚠️ Dimensions / Thread / Weight Not Publicly Disclosed: Public supplier listings for this assembly do not publish external dimensions, thread size, or net weight. Confirm these specifications at inquiry for logistics and fitment cross-checking.

✅ [Failure Symptoms — When to Replace]

• Oil leak at the filter assembly or cooler joint: Visible oil seepage or drips from the filter housing-to-block interface or the cooler module connections — a direct sign of gasket or O-ring failure.

• Oil pressure warning / low oil pressure: A clogged or collapsed filter element, or a failed internal bypass valve in the assembly, can restrict oil flow and trigger low oil pressure warnings.

• Engine oil overheating / rapid oil degradation: A failed oil cooler module allows oil temperature to rise unchecked, accelerating oil oxidation and reducing lubricating effectiveness.

• Metal debris or sludge in the oil: A compromised filter element allows contaminants to circulate, accelerating bearing and cylinder wear.

• Oil cooler coolant/oil mixing: A failed internal cooler can allow coolant and oil to mix, producing milky oil or coolant contamination — a serious engine-damaging condition.

• Whistling or abnormal noise from the filter area: A partially blocked filter or a loose assembly can produce intake or flow-related noise.

⚠️ Consequence of Ignoring Symptoms: A failed oil filter assembly on a 4KH1/4JH1-TC commercial diesel can lead to oil starvation, bearing damage, turbocharger failure, and oil cooler contamination of the cooling system. On a working NKR77 or 600P, this can turn a routine filter service into a major engine repair. The integrated oil cooler module makes this assembly a critical lubrication and thermal management component, not a disposable filter alone.

✅ Vehicle & Engine Compatibility

Primary Confirmed Applications:

⚠️ Important Fitment Notes:

• Assembly vs. element is the first check: This is the complete oil filter assembly with integrated oil cooler. If the customer only needs the filter element, order 1012011-803B1 / QL139 — do not use the assembly part number for an element-only replacement.

• 4KH1 vs. 4JH1: Both engine families share this assembly reference in aftermarket coverage. However, confirm the engine code and the original assembly marking before ordering, especially for transitional model years.

• Quality tier selection: The assembly is available in Chinese ISUZU quality and Japanese ISUZU quality tiers. For fleet or warranty-sensitive applications, specify the Japanese quality tier at inquiry.-4

• Integrated cooler module: This is not a conventional spin-on filter. The oil cooler function means the assembly must be matched to the engine’s cooling circuit. Do not substitute a non-cooler filter assembly.

✅ Features & Benefits

✅ Quality Control & Verification

Because this assembly exists in assembly vs. element configurations and multiple quality tiers, confirming the physical scope (assembly with cooler, quality tier, and included element) on the first sample is recommended before bulk commitment.

✅ Installation & Maintenance Recommendations

⚠️ IMPORTANT: Oil filter assembly service on a common-rail diesel requires a warm engine (not hot), proper oil draining, and correct torque on the housing and cooler connections. Always refer to the ISUZU 4KH1/4JH1 workshop manual for the specific model. Improper installation can cause oil leaks, low oil pressure, or cooler circuit contamination.

Installation Guidelines (Reference Only):

1. Confirm the required scope first: Verify whether the vehicle requires the complete assembly with cooler or a filter element only. Compare the original unit’s physical form to the replacement.

2. Warm the engine, then drain oil: Run the engine briefly to warm the oil (not hot), then drain the oil pan. Do not drain oil from a cold engine — contaminants settle and are not fully removed.

3. Remove the old assembly: Unbolt the assembly from the engine block or cooler housing. Note the orientation of the oil cooler lines (where equipped) and the position of any gaskets or O-rings.

4. Clean the mating surface: Remove all old gasket residue and oil film from the block face. A clean surface is essential for a leak-free seal.

5. Install the new assembly with new gaskets/O-rings: Seat new seals (included or separately ordered — confirm at inquiry) and position the assembly. Do not reuse old gaskets.

6. Torque to specification: Tighten the assembly retaining bolts or housing to the workshop manual specification. Do not over-torque — the housing and cooler connections are sensitive to distortion.

7. Reconnect cooler lines (if equipped): Reconnect the oil cooler coolant/oil lines and tighten fittings to specification. Check for leaks before filling with oil.

8. Fill with correct engine oil: Refill with the ISUZU-recommended diesel engine oil for the 4KH1/4JH1-TC and the correct viscosity for the operating climate.

9. Run and verify: Start the engine, allow oil pressure to build, and check for leaks at the assembly and cooler connections. Confirm no low oil pressure warning and correct oil level on the dipstick.

Maintenance Schedule:

• Replace the filter element according to the ISUZU maintenance schedule (typically every 10,000–15,000 km for commercial truck applications, or more frequently in dusty conditions).

• Inspect the assembly and cooler joints at every oil service — look for oil seepage, coolant residue, or loose fittings.

• Replace the complete assembly if the housing is cracked, the cooler module fails, or the internal bypass valve is compromised — do not attempt to repair a failed cooler module.

• Use only the specified filter element (1012011-803B1 / QL139) — a mismatched element can collapse or bypass, defeating filtration.

✅ Packaging & Supply

• Standard packing: Plastic bag + color box + carton; neutral packaging or customer-branded packaging available on request.-4

• Package contents: 1 × Oil Filter Assembly (with integrated oil cooler and filter element) . Gaskets/O-rings may or may not be included — confirm at inquiry.

• Set options: Complete assembly / assembly + gasket kit / filter element only (1012011-803B1 / QL139) — specify at inquiry.15

• Suitable for: ISUZU NKR77 / 600P / NPR / NQR / ELF fleet maintenance departments, diesel engine lubrication system repair shops, commercial truck spare parts distributors, and export wholesalers serving Southeast Asia, the Middle East, Africa, and Latin America.

• Related parts available: Filter element (1012011-803B1 / QL139), oil cooler module components, gasket/O-ring kits, engine oil, and complete 4KH1/4JH1-TC lubrication system service kits.