Bosch DLLA158P1092 Nozzle is a multi‑hole common rail injector nozzle designed primarily for Isuzu 4HK1 and 6HK1 diesel engines, as well as Case excavators (5.2d), Dongfeng DCI11 engines, and Hino/TOYOTA Dyna applications. Unlike the previous articles in this series that focused on Bosch CRI systems for Cummins engines, this nozzle operates in DENSO common rail systems—an important distinction because DENSO injectors use different solenoid valve platforms, injector body designs, and ECU calibration protocols. Operating pressure: 1,600–2,000 bar depending on the specific engine application.
Key specs at a glance:
- Nozzle stamping: DLLA158P1092
- Bosch nozzle number: 0 433 172 012 / 0433172012
- DENSO nozzle number: 093400‑1092
- Compatible DENSO injectors: 095000‑534# series, 095000‑636# series
- Engine applications: Isuzu 4HK1 (5.2L), 6HK1 (7.8L), Case Excavator 5.2d, Dongfeng DCI11, HINO300
- Solenoid valve compatibility: DENSO platform (different from Bosch CRIN valves)
- Cross references: 6980567, ALLA158P844, 093400‑8440
Table of Contents
- Introduction – A DENSO‑Platform Nozzle in a Bosch Series
- Complete Technical Specifications
- DENSO vs. Bosch Injector Systems – Understanding the Difference
- Compatible Injector Assemblies and OE Cross‑References
- Vehicle and Engine Applications
- DLLA158P Series — Other Variants
- Common Failure Symptoms and Diagnosis
- Installation and Replacement Guidelines
- FAQ
- Looking for DLLA158P1092 Nozzles?
- Related Articles
- Conclusion
1. Introduction – A DENSO‑Platform Nozzle in a Bosch Series
The Bosch DLLA158P1092 marks an important departure from the previous articles in this series. While the first four nozzles (DLLA142P1709, DLLA118P2203, DLLA148P1726, DSLA143P970) are designed for Bosch CRI (Common Rail Injector) systems powering Cummins and MAN engines, the DLLA158P1092 is primarily used in DENSO common rail systems for Isuzu and other Asian market applications.
Despite bearing a “Bosch nozzle number” (0 433 172 012), the nozzle itself is a multi‑hole injector tip that fits DENSO injector bodies. This reflects an important reality in the diesel injection aftermarket: nozzle manufacturers produce standardized tips that work across multiple injector brands, as long as the physical dimensions, spray pattern, and flow calibration match the injector’s requirements.
The DLLA158P1092 is a hole‑type nozzle with standard sac volume (DLLA series), similar in basic design to the earlier Cummins‑focused nozzles, but calibrated for the fuel delivery characteristics of Isuzu’s 4HK1 (5.2L) and 6HK1 (7.8L) engines, as well as Case excavators, Dongfeng DCI11 engines, and Hino/TOYOTA Dyna applications.
Understanding this nozzle requires shifting perspective from Bosch CRI systems to DENSO common rail architecture—different solenoid valves, different injector body designs, and different failure modes. This article will cover both the technical specifications and the practical distinctions for service technicians working on Isuzu, Case, and Dongfeng equipment.
2. Complete Technical Specifications
The following specifications are compiled from Bascolin, DENSO OE documentation, and industry aftermarket catalogs.
Identification Numbers
| Category | Number |
|---|---|
| Nozzle stamping | DLLA158P1092 |
| Bosch nozzle number | 0 433 172 012 (also 0433172012) |
| DENSO nozzle number | 093400‑1092 / 0934001092 |
| Bascolin reference | ALLA158P1092J |
| Common interchange | 6980567, 738431, ALLA158P844 |
Physical Characteristics
- Component type: Multi‑hole common rail nozzle (DLLA series, standard sac volume)
- Number of holes: Typically 5–6 (varies by specific application variant)
- Material: High‑speed steel, vacuum hardened (HRC 62–65)
- Weight: Approximately 35–40 g
- Fuel compatibility: Diesel (EN 590 / ASTM D975)
Hydraulic and Performance Data
- System injection pressure: 1,600–2,000 bar (depending on engine application)
- Compatible injector families: DENSO 095000‑534#, 095000‑636#
- Static return flow (new): Refer to DENSO injector test stand specifications
- Nozzle cap tightening torque: Refer to injector maintenance manual (typically 50 N·m range)
Quality Standards
- ISO9001 / ISO/TS16949 certified manufacturing
- 100% flow‑tested before shipment
- Multi‑hole laser drilling for precise spray pattern
- Vacuum hardening for consistent component hardness
3. DENSO vs. Bosch Injector Systems – Understanding the Difference
The nozzle is a component, not the whole injector. A critical distinction for service technicians is the difference between DENSO common rail injectors and the Bosch CRI (Common Rail Injector) systems covered in previous articles.
Bosch CRI systems (covered in earlier nozzles):
- Use Bosch‑specific solenoid valves (e.g., F 00R J01 941, F 00R J02 697)
- Typically paired with Bosch injector assemblies (0 445 xxx xxx series)
- Calibrated for Cummins, MAN, and other European/Chinese engines
- Injector trim codes stored in ECU; reset via Cummins Insite or Bosch diagnostic tools
DENSO common rail systems (where DLLA158P1092 is used):
- Use DENSO‑specific solenoid valves (different part numbers, different electrical characteristics)
- Typically paired with DENSO injector assemblies (095000‑xxxx series)
- Calibrated for Isuzu, Toyota, Hino, and other Japanese/Asian engines
- Injector trim codes reset via DENSO‑compatible diagnostic tools
Why this matters for nozzle selection:
- A nozzle that physically fits a DENSO injector body may not fit a Bosch injector body—the securing nut, alignment pin location, and body length differ.
- Even if the nozzle physically fits, the flow calibration (spray pattern, flow rate, penetration) is matched to the injector’s intended application. Using a nozzle calibrated for a 5.2L Isuzu engine in a 8.9L Cummins engine would produce incorrect fueling.
For the DLLA158P1092, the primary injector families are DENSO 095000‑534# and 095000‑636#, not Bosch 0 445 xxx xxx injectors. Always verify the injector assembly number before ordering.
4. Compatible Injector Assemblies and OE Cross‑References
Based on Bascolin product data and industry catalogs, the DLLA158P1092 nozzle is factory‑matched to the following DENSO injector assemblies.
Primary Injector Families
| Injector Family | Specific Models | Application |
|---|---|---|
| 095000‑534# | 095000‑5340, 5341, 5342, 5343, 5344, 5345, 5346, 5347 | Isuzu 4HK1, 6HK1 |
| 095000‑636# | 095000‑6360, 6361, 6362, 6363, 6364, 6365, 6366, 6367 | Isuzu NQR/FRR (4HK1) |
| 095000‑893# | 095000‑8930, 8931, 8932, 8933 | Isuzu F Series |
Complete Injector Assembly Cross References
The following OEM part numbers refer to complete injectors that use the DLLA158P1092 nozzle:
- 8‑97609788‑0, 8‑97609788‑1, 8‑97609788‑2, 8‑97609788‑3, 8‑97609788‑4, 8‑97609788‑5, 8‑97609788‑6, 8‑97609788‑7
- 8‑97602485‑0 through 8‑97602485‑7
- 8‑98160061‑0, 8‑98160061‑1, 8‑98160061‑2, 8‑98160061‑3, 8‑98160061‑4, 8‑98160061‑5, 8‑98160061‑7
- 8981600610, 8981600611, 8981600612, 8981600613
- 8976097880, 8976097881, 8976097882, 8976097883, 8976097884, 8976097885, 8976097886
Overhaul Kits
For injector 095000‑6366, Bascolin offers a complete overhaul kit that includes the DLLA158P1092 nozzle, making it a direct fit for ISUZU NQR/FRR (4HK1) applications.
Where to find the injector number: Laser‑etched on the solenoid valve body or injector body. DENSO injectors typically have a 10‑digit number starting with “095000‑”.
5. Vehicle and Engine Applications
The DLLA158P1092 nozzle is used across a diverse range of medium‑duty diesel equipment worldwide. According to Bascolin, eBay compatibility data, and industry sources, here are the most common applications.
Isuzu Applications (Primary)
4HK1 Engine (5.2L, 148–175 HP)
- Isuzu Forward (medium‑duty truck)
- Isuzu NQR / NRR series (straight trucks, low tilt/cab configurations)
- 2001-04 Isuzu FRR / FSR series
- Isuzu FTR / FVR series
- Isuzu FSS series
- Engine variants: 4HK1, 4HK1‑TCC, 4HK1‑TCS
6HK1 Engine (7.8L, 225–300 HP)
- Isuzu Forward (heavy‑duty truck)
- Isuzu F Series (5.2d / 7.8d)
- Engine variants: 6HK1
Construction Equipment
- Case Excavator 5.2d – documented by Bascolin as a direct application
- Case Excavator models powered by Isuzu 4HK1/6HK1 engines
Chinese Market Applications
- Dongfeng DCI11 engine – the DLLA158P1092 nozzle is used with injector 095000‑636# in Dongfeng heavy trucks
Japanese Light/Medium Truck Applications
- HINO300 series (N04C engine) – documented in Chinese aftermarket catalogs-
- TOYOTA Dyna – referenced in industry listings-
eBay Cross‑Vehicle Compatibility
According to an eBay listing for the DLLA158P1092 nozzle, it fits over 152 vehicle variants, primarily 2022–2023 Isuzu NQR and NRR models with 5.2L turbo‑diesel engines.
Key takeaway for technicians: If you are servicing an Isuzu truck or Case excavator with a 4HK1 or 6HK1 engine, the DLLA158P1092 is the correct nozzle. For Dongfeng DCI11 and HINO/TOYOTA applications, always verify the injector assembly number first.
6. DLLA158P Series — Other Variants
The DLLA158P series includes multiple nozzle variants with similar physical dimensions but different flow calibrations and applications. According to industry catalogs, the following variants are documented.
| Nozzle Model | Key Differences | Typical Application |
|---|---|---|
| DLLA158P1092 | Flow code 1092 (baseline) | Isuzu 4HK1, 6HK1, Case 5.2d |
| DLLA158P844 | Lower flow code (093400‑8440) | Isuzu, some overlap with 1092 applications |
| DLLA158P1096 | Different flow calibration | Isuzu, various |
| DLLA158P854 | Alternative calibration | Isuzu aftermarket |
| DLLA158P984 | Alternative calibration | Isuzu aftermarket |
| DLLA158P1133 | Higher flow variant | Performance applications |
Critical note: The DLLA158P844 (093400‑8440) is often listed as an interchange for DLLA158P1092 on eBay and other platforms, but they have different flow calibrations. ALWAYS verify your original injector assembly number before substituting.
When selecting a replacement nozzle, it is crucial to match the exact stamping (DLLA158P1092) unless the injector manufacturer explicitly lists an alternative calibration as a direct replacement.
7. Common Failure Symptoms and Diagnosis
Based on diesel injection industry documentation, the following failure patterns are common for the DLLA158P1092 nozzle.
Common Failure Symptoms
Symptom 1: Black smoke under load
- What’s happening: Nozzle wear leads to increased fuel quantity; holes may be eroded from high‑pressure fuel flow containing abrasive particles
- Mechanism: Impurities (water, lead, aluminum powder, iron powder, sulfide) in fuel exceeding standard requirements
- Severity: High – indicates nozzle replacement needed
Symptom 2: Reduced engine power / poor acceleration
- What’s happening: Nozzle needle wear leads to oil hole blockage and insufficient fuel injection
- Mechanism: Needle valve can’t move smoothly; may be stuck partially open or closed
- Severity: Medium – investigate promptly
Symptom 3: Black smoke from exhaust
- What’s happening: Nozzle spring rust leads to spring fracture; opening pressure decreases, increasing injector oil quantity
- Mechanism: Corrosion from moisture in fuel system
- Severity: High – risk of DPF damage (if equipped)
Symptom 4: Nozzle cap damage / cracking
- What’s happening: High‑intensity work under high temperature causes nozzle cap deformation, cracking, thread damage, or leakage
- Mechanism: Thermal fatigue over extended service life
- Severity: High – leads to black smoke and injector damage
Symptom 5: Needle valve stroke adjustment gasket wear
- What’s happening: Needle valve stroke becomes larger, increasing fuel quantity
- Severity: Medium – leads to black smoke over time
Root Causes of Failure
Fuel contamination — leading cause
- Water in diesel fuel — causes rust on precision components
- Solid particles (rust, dust, metal debris) — abrasively wear nozzle holes and needle valve
- Lead, aluminum powder, iron powder, sulfide exceeding standard requirements — documented causes of nozzle failure
Normal wear
- Nozzle normally worn due to long‑term high‑temperature operation
- Needle wear leads to oil hole blockage
- Spring rust leads to fracture and black smoke
Installation errors
- Nozzle cap deformation or cracking from improper torque
- Nozzle cap thread damage or leakage leads to injector damage
Diagnostic Methods
Step 1: Return flow (leak‑off) test
- Use six graduated bottles and a set of hoses
- Idle engine for 2 minutes, compare volumes
- Any injector with significantly higher return flow should be suspect
Step 2: Test stand inspection
- Professional test stand (DENSO‑compatible) required for accurate diagnosis
- Visual spray pattern check — must be symmetric, no dripping
- Opening pressure verification
- Dynamic flow across pulse widths
- Static return flow check — should not exceed 8 mm³/h
Step 3: OBD fault code reading
- Use DENSO‑compatible diagnostic tools (not Cummins Insite)
- Fault codes vary by vehicle manufacturer; consult your service manual
8. Installation and Replacement Guidelines
The following guidelines apply to DENSO injector systems using the DLLA158P1092 nozzle. For the Isuzu 4HK1/6HK1 platform, the following specifications are documented.
Torque Specifications (DENSO Injector Systems)
| Component | Torque | Notes |
|---|---|---|
| Nozzle cap tightening torque | 50 N·m (reference) | Consult injector maintenance manual for exact specification |
| Injector hold‑down clamp | Refer to engine service manual | Isuzu 4HK1/6HK1 specifications vary |
| High‑pressure fuel line | Refer to engine service manual | Use calibrated torque wrench only |
Critical warnings:
- The torque lever and tightening moment specified in the injector maintenance manual must be installed when the injection nozzle is installed
- Nozzle cap deformation, cracking, thread damage, or leakage will lead to black smoke and injector damage
New Copper Gasket
- Always use a new copper sealing gasket — never reuse old gaskets
- DENSO injectors typically require a specific gasket thickness; consult your injector manual
Priming Procedure (Isuzu 4HK1/6HK1)
- Turn ignition ON and allow the fuel priming pump to cycle
- Some Isuzu engines have a manual primer lever on the fuel filter base
- Crank engine; may take several seconds due to air bleeding
Nozzle Tight Cap Replacement
- Replace the nozzle tight cap after 5 disassemblies
- Nozzle cap cracking is caused by high‑intensity work under high temperature
Test Stand Verification After Installation
After nozzle replacement, the injector must be tested on a test stand. The correct injector type should be selected for testing, and results must ensure that the following items are within the standard data range:
- Leak test — no dripping from the nozzle, no oil leaking from joints
- Static oil return — should not exceed 8 mm³/h
- Full load oil (main injection, high speed) — within standard range
Full Set Replacement Recommendation
Always replace all six injector nozzles as a matched set to maintain balanced fuel delivery across all cylinders. Replacing only one nozzle will cause cylinder‑to‑cylinder imbalance, rough idle, and possible fault codes.
Critical Safety Note for DENSO Injectors
Unlike Bosch CRI injectors, which have detailed torque specifications widely published in English, DENSO injector torque values vary by specific injector model (095000‑534#, 095000‑636#, 095000‑893#). Always refer to the manufacturer‘s service manual for your specific engine and injector combination before attempting repair. Injector repair requires specialized tools and training; if you are not experienced with DENSO common rail systems, consider sending injectors to a professional diesel injection shop.
9. FAQ
1. What injector assemblies use DLLA158P1092?
The nozzle is used in DENSO injector families 095000‑534# and 095000‑636#, primarily for Isuzu 4HK1 and 6HK1 engines. Specific models include 095000‑5340–5347 and 095000‑6360–6367.
2. Is DLLA158P1092 used in Bosch injectors?
No—this nozzle is designed for DENSO injectors. While the nozzle itself carries a Bosch catalog number (0 433 172 012), it is not used in Bosch 0 445 xxx xxx injector assemblies. This is a critical distinction for service technicians.
3. What engines use DLLA158P1092?
Isuzu 4HK1 (5.2L, 148–175 HP) and 6HK1 (7.8L, 225–300 HP); Case Excavator 5.2d; Dongfeng DCI11; HINO300 N04C; TOYOTA Dyna.
4. What is the difference between DLLA158P1092 and DLLA158P844?
DLLA158P844 (093400‑8440) is an alternative calibration often listed as an interchange, but the two have different flow characteristics. Always verify your original injector assembly number before substituting.
5. What causes DLLA158P1092 nozzle failure?
Fuel contamination (water, lead, aluminum powder, iron powder, sulfide), normal wear from high‑temperature operation, needle valve wear leading to oil hole blockage, spring rust/fracture, and nozzle cap cracking from thermal fatigue.
6. Can I replace just one DLLA158P1092 nozzle?
Not recommended. Replace all nozzles in a full set (all 4, 6, or 8 cylinders) to maintain balanced fuel delivery and avoid cylinder imbalance fault codes.
7. Where can I find OE cross references for the complete injector?
The injector assembly OE numbers include 8‑97609788‑0 through 8‑97609788‑7, 8‑97602485‑0 through 8‑97602485‑7, 8‑98160061‑0 through 8‑98160061‑7, and 8981600610–8981600613.
10. Looking for DLLA158P1092 Nozzles?
We supply OEM‑quality replacement components for both Bosch and DENSO common rail systems:
Products available:
- DLLA158P1092 (0 433 172 012 / 093400‑1092) nozzles
- Complete DENSO injector assemblies: 095000‑534#, 095000‑636#
- Overhaul kits for 095000‑6366 including nozzle and all sealing components
- Nozzle tight caps, copper sealing gaskets, and control valve components
Quality features:
- ISO9001 certified manufacturing
- 100% flow‑tested before shipment
- OEM specifications and tolerances
- Multi‑hole laser‑drilled nozzles
- High‑speed steel construction (HRC 62–65)
Service features:
- Competitive wholesale pricing
- Worldwide shipping available
- Technical support for installation and diagnosis
- Bulk order discounts for distributors
For technical support, quotations, or wholesale inquiries, please contact our diesel injection specialists with your OEM part number for verification and fast quoting.
11. Related Articles
Read more from this series:
- DSLA143P970 Nozzle: Complete Specs, Injector Compatibility & Applications for Cummins ISBe
- DLLA118P2203 Nozzle: Specs, Injector Compatibility & Cummins QSL9 Guide
- DLLA152P2344 Common Rail Nozzle: Specs, Injector Compatibility & Weichai WD10
- Common Rail Nozzle DSLA143P5540 for IVECO Eurocargo Ford F250 0445120273
- Common Rail Nozzle DSLA153P1242 for Mercedes Benz W639 Viano Vito
12. Conclusion
The Bosch DLLA158P1092 (093400‑1092) nozzle is designed for DENSO injectors in Isuzu 4HK1/6HK1 engines, Case excavators, Dongfeng DCI11 trucks, and Hino/TOYOTA light vehicles. Its multi‑hole, high‑speed steel design (HRC 62–65) operates at 1,600–2,000 bar and is calibrated for DENSO 095000‑534# and 095000‑636# injector families.
Installation tips: verify injector assembly, use a new copper gasket, torque the nozzle cap to 50 N·m, test on a stand, and replace all nozzles as a matched set. Common failures arise from fuel contamination, high‑temperature wear, needle valve issues, spring rust, or nozzle cap cracking.
Pro Tip: Ensure correct injector matching and use DENSO‑compatible diagnostic tools.
Need DLLA158P1092 nozzles or overhaul kits? Contact our diesel injection specialists with your injector number for fast verification and quoting.
