Bosch 0445120272 Common Rail Fuel Injector 5263305 for Cummins QSC8.3 ISC 8.3

1. Product Overview

Brand new Bosch 0445120272 common rail fuel injector for Cummins QSC8.3 / ISC 8.3 (8.3L) engines, Cummins OE number 5263305 (also sold under the same number for Komatsu, and as Case 87581565). The OE pairing is confirmed by a Bosch technical file, a remanufactured-parts catalogue and dealer listings. This Bosch number also appears as a cross number within the 0445120112 application family (family OE pool includes 4940439), so the two injectors can only be told apart by the number engraved on the old injector. Warning: the number 5263307, sometimes printed in the same OE pool, belongs to 0445120212 only — it is NOT this injector’s OE number. This injector is completely different from the consecutive number 0445120273 (Cummins ISBe family) — never cross the two.

2. Specifications

3. Fitment

Cummins QSC8.3 / ISC 8.3 (8.3L) engines, including Komatsu and Case machinery applications under the same OE number. Fitment data is for reference only — please confirm by the number engraved on your old injector or send us your VIN before ordering.

4. Cross-Reference

Note: 5263307 does NOT belong to this injector — it is the OE number of 0445120212. Do not use it to identify or order this number.

5. After-Sales & Warranty

Professional installation by a qualified diesel technician is recommended. Every injector is covered by a 6-month warranty (3 months for wear parts). Defective or wrong items can be returned or exchanged within 15 days of receipt; return shipping is on the buyer unless the error is ours. Orders are processed within 1–2 business days with tracking, and refunds are issued within 7 business days after inspection. Full terms: see our Shipping & Returns page.

6. Why Choose Us

Factory-direct supply from Wuhan Ranyingyi Trading Co., Ltd. (injector-factory.com). Every injector is bench-tested before shipment, packed for export, and backed by fast, technical support on WhatsApp (+86 156 3802 2858) — send us your old injector’s engraved number or your VIN and we verify the exact match free of charge before you pay.

FAQ

Q1: How can I be sure this injector fits my engine?
A: Send us the number engraved on your old injector, or your VIN, on WhatsApp (+86 156 3802 2858). Our technicians will verify the exact compatibility free of charge before you order. Fitment data on this page is for reference only.

Q2: Does the price include shipping?
A: No. Our prices do not include shipping. Please contact us on WhatsApp (+86 156 3802 2858) for the latest price, and the freight will be confirmed with you on WhatsApp after you place the order, before anything is charged for delivery.

Q3: What warranty and returns do I get?
A: Core injectors carry a 6-month warranty (wear parts 3 months). Defective or wrong items can be returned or exchanged within 15 days of receipt; refunds are processed within 7 business days after inspection.