G5-55 Caterpillar 3116 Fuel Injector Repair Kit HEUI Nozzle Service

G5-55 Caterpillar 3116 Fuel Injector Repair Kit — HEUI and EUI Injector Overhaul Tool

1. What is the G5-55 Caterpillar 3116 Fuel Injector Repair Kit?

The BEACON G5-55 Caterpillar 3116 Fuel Injector Repair Kit is a workshop-grade overhaul kit designed for the on-bench disassembly, cleaning, seal replacement, nozzle service and reassembly of Caterpillar 3116 series fuel injectors — covering both the HEUI (Hydraulically actuated Electronic Unit Injector) generation (1997–2002) and the earlier EUI / PEEC generation (1990–1997).

The kit combines the dedicated holding fixtures (engraved CAT-3116 / HIDE / TSHA / HTDE / CN-3116), a spring-loaded compression tool for nozzle disassembly, and two compartmentalized parts boxes containing the full set of replaceable nozzles, needles, springs, seals, O-rings and copper gaskets used during injector overhaul.

2. Why Caterpillar 3116 Injectors Need a Dedicated Repair Kit

The Caterpillar 3116 is a 6.6L inline-6 diesel that powered a huge installed base of on-highway trucks, construction equipment, marine vessels and generator sets between 1990 and 2002. Over that 12-year window, the engine migrated from mechanical injection to PEEC electronically-timed EUI, and finally to the HEUI hydraulic-electronic injector system in 1997.

Independent workshops still see HEUI and EUI 3116 injectors every week for the classic failure modes: nozzle coking, O-ring and copper gasket failure, HEUI actuating-oil seal failure, wiring harness / solenoid connector corrosion, plunger / delivery-valve wear, nozzle atomization failure, HPI common-cause failure, and excess return fuel from injector leakage. The G5-55 is built to address every one of these failure modes on the bench, without the workshop having to source a local CAT-3116-specific fixture.

3. What Does the G5-55 Kit Include?

The kit ships in a foam-lined case containing:

• Spring-loaded compression body — black anodized cylinder with compression spring, threaded rod and pressure plate; compresses the injector return spring so the nozzle retainer can be released.
• HEUI injector holding fixture — engraved CAT-3116 / HTDE; locates the HEUI injector body on its centerline.
• EUI / PEEC injector holding block — engraved CAT-3116 / TSHA; locates the earlier EUI injector generation.
• Nozzle extraction adapter — engraved CN-3116 / 13HA; pulls the nozzle from the injector body without cracking the bore.
• C-clamp nozzle service tool — silver C-frame with yellow release button; supports nozzle disassembly and reseating.
• Parts box A — compartmentalized case with blue latches containing the nozzle, needle, spring and small seat parts.
• Parts box B — matching compartmentalized case with the seal, O-ring, copper gasket and shim set.

4. Where the Caterpillar 3116 Injector Is Used

The Caterpillar 3116 family has been fitted to a wide range of platforms, including on-highway trucks (Peterbilt 330 / 335 / 340 / 357; Kenworth T300 / T400 / T450; Mack RD / CH; Sterling AT / ST; Freightliner FL / MC; International 4000; Renault Midlum; Volvo WA / WG partial), construction equipment (Caterpillar 320 / 325 / 330 partial; 950G / 962G / 966G loaders; D5 / D6 / D7; 140H / 160H graders), marine (Caterpillar Marine 3116, 225 / 250 / 300 / 340 HP, IMO Tier 1), generator sets (CAT / Olympian GEP-XQ at 130–300 kWe; FG Wilson P / QD), and the Perkins 1106 / T6.660 mechanical platform via cross-reference.

Caterpillar and Perkins injector part numbers in the 0R-8474, 0R-8479, 107-7732, 138-0094, 10R-7672, 10R-7673 (HEUI) and 4P-3996, 4P-3997, 4P-3998, 7C-9577, 7C-9578 (EUI / mechanical) series are commonly seen on the 3116 family. The exact part-to-engine cross reference should always be confirmed against CAT SIS2.0 or Perkins Quick Serve Online (QSO) before quoting or ordering.

For detailed application background, common failure modes, and complete step-by-step workshop workflow, see the companion BLOG post: G5-55 BLOG: full Caterpillar 3116 injector repair kit overview.

5. 3116 vs 3126 vs 3176 vs 3306 Injector Compatibility

The G5-55 is dedicated to the 3116. The Cat 3116 shares its 6.6L inline-6 platform with the later 7.2L 3126 (HEUI-native, 1997–2007), but the two engines do not use interchangeable injectors — bore, flow and lift are different. The G5-55 only fits the 3116 (and, with confirmation, the mechanical Perkins 1106 / T6.660 platform). Do not attempt to use it on 3126, 3176 or 3306 injectors.

6. Build Quality and Packaging

All structural components in the G5-55 are machined from hardened alloy steel and anodized aluminum. The compression body, holding fixtures and nozzle extraction adapter are precision-ground for repeatable injector concentricity. Net weight approximately 7 kg; case size 42 × 32 × 22 cm. Complete kit in foam-lined blow-molded case.

7. Technical Specifications

Product Advantages

• Covers both HEUI and EUI 3116 injector generations — the kit ships with dedicated holding fixtures for the 1997–2002 HEUI generation (CAT-3116 / HTDE) and the earlier 1990–1997 EUI / PEEC generation (CAT-3116 / TSHA), so a single kit handles both injector types.
• Complete overhaul solution — spring-loaded compression body, nozzle extraction adapter (CN-3116 / 13HA), C-clamp nozzle service tool, and two compartmentalized parts boxes with nozzles / needles / springs / seals / O-rings / copper gaskets — everything the workshop needs on the bench.
• Nozzle extraction without bore damage — the CN-3116 / 13HA adapter pulls the nozzle from the injector body along its disassembly axis, avoiding the cracking and distortion that improvised pullers cause.
• Hardened alloy steel + anodized aluminum — the structural components are precision-machined and ground for repeatable injector concentricity and long service life in the workshop environment.
• Caterpillar 3116 + mechanical Perkins 1106 / T6.660 — dedicated to the 3116 family, with mechanical cross-reference compatibility for the Perkins 1106C-E60TA, 1106D-E66TA and T6.660 6.6L platform used in the UK and European aftermarket.
• Foam-lined blow-molded case — the complete kit ships in a 42 × 32 × 22 cm case with a custom foam insert, ready for shop-floor use.