IMO ACG 045 N5 NTBP Major Spare Parts Kit G054

IMO ACG 045 N5 NTBP Major Spare Parts Kit G054 (Complete Overhaul Kit – New)

The IMO ACG 045 N5 NTBP Major Spare Parts Kit G054 is a complete OEM-specification overhaul assembly engineered to restore volumetric efficiency, differential pressure capability, and shaft sealing integrity in legacy Generation 5 IMO ACG Series three-screw positive displacement pumps. Designed specifically for the 45 mm power rotor frame (045) built with the NTBP configuration (cast iron casing, high-temperature elastomers/mechanical seal assembly, standard bearing arrangement, and max-pressure adjustable relief valve), this kit addresses severe internal wear, rotor flank scoring, bearing play, and mechanical seal failure.

Unlike minor service kits (G053) or dismantling gasket sets (G057), the G054 Major Kit combines the complete matched rotor set (G012 for standard clockwise rotation) with the minor overhaul kit (G053) and relief valve spring (615), enabling full hydraulic and mechanical restoration without sourcing individual sub-assemblies.

Model Details

• Full OEM Designation: IMO ACG 045N5 NTBP – Spare Part Set G054 (Major Kit)
• Manufacturer Part Number (MPN) / Kit Code: G054 (Legacy notation: 54G)
• Sub-Kit Composition: G012 (CW Rotor Set) + G053 (Minor Kit: G050 Mechanical Seal + G057 Joint/Gasket Kit + Item 122 Ball Bearing) + Item 615 (Valve Spring)
• Pump Series & Frame: ACG Low-Pressure Three-Screw Pump, Size 045 (45 mm Power Rotor Outer Diameter)
• Design Generation: N5 (Generation 5, Cast Iron Casing / DIN Flange Standard)
• Version Code Breakdown (NTBP):
  • N: Cast iron pump body (401)
  • T: High-temperature shaft seal (G050 / Pos. 509) and elastomer specification for elevated-temperature fuel/lube oil duties (such as HFO)
  • B: Standard external grease-lubricated ball bearing arrangement (122)
  • P: Integral pressure relief valve adjustable up to maximum operating pressure

Features

1. Matched Three-Screw Rotor Geometry (G012): Includes precision-ground power rotor (1020) and two idler rotors (202) machined for standard clockwise (CW) rotation (viewed from shaft end) to re-establish tight hydrodynamic sealing chambers.
2. High-Temperature xTxx Mechanical Shaft Seal (G050): Engineered with thermally stable seal faces and fluorocarbon/high-temp secondary elastomers to withstand heavy fuel oil (HFO) heating and continuous thermal cycling.
3. Complete Static Joint & Sealing Kit (G057): Supplies all required front/rear cover gaskets (506, 556), plug sealing washers (462A, 537A), valve O-rings (605), and retaining/support rings (124, 124A, 359A, 514, 608A) for zero-leakage reassembly.
4. External Ball Bearing & Relief Valve Spring Included: Incorporates replacement deep-groove ball bearing (122) and relief valve spring (615) to eliminate radial shaft deflection and restore accurate bypass cracking pressure.
5. Drop-In Overhaul Solution for Generation 5 Units: Eliminates guesswork across individual BOM line items by consolidating all dynamic wear components into one factory-matched kit.

Direct Equipment Compatibility

• Primary Fit: IMO ACG 045N5 NTBP (and ACG 045K5 NTBP where K5/N5 internal BOM matches)
• ANSI Flange Equivalent: IMO UCG 045N5 NTBP / UCG 045K5 NTBP (internal rotating elements, seals, bearings, and gaskets are identical between DIN ACG and ANSI UCG frames of the same generation)
• Rotation Note: Standard configuration (G012 rotor set) fits standard CW pumps. If your pump nameplate carries option code A101 (counter-clockwise rotation), verify rotor set G011 substitution prior to installation.

Frequently Asked Questions

What is included in the IMO ACG 045 N5 NTBP Major Spare Parts Kit G054?

The G054 Major Kit is a complete overhaul package containing the clockwise three-screw rotor set (G012: power rotor 1020 and two idler rotors 202), the high-temperature mechanical shaft seal (G050 / Pos. 509), the external grease-lubricated ball bearing (Pos. 122), the relief valve spring (Pos. 615), and the full G057 joint kit (front/rear cover gaskets, O-rings, sealing washers, and circlips).

What is the difference between IMO Kit G053 and Kit G054?

The G053 Minor Kit contains only consumables—the mechanical shaft seal (G050), ball bearing (122), and gaskets/O-rings (G057)—for routine maintenance. The G054 Major Kit includes everything in the G053 kit plus the complete precision-ground power and idler rotor set (G012) and relief valve spring (615) required when internal screw wear reduces pump flow or discharge pressure.

Will the G054 kit for ACG 045 N5 NTBP fit an ACG 045 N7 pump?

No. Generation 5 (N5) and Generation 7 (N7) IMO ACG pumps have different internal rotor dimensions, casing lengths, and mechanical seal assemblies. Always verify the generation digit (N5 vs. N7) and the 4-letter version code (NTBP vs. NVBP) on your pump nameplate before ordering.

What does the version code “NTBP” stand for on an IMO ACG 045 N5 pump?

In IMO’s nomenclature, N indicates a cast iron pump body, T specifies high-temperature mechanical shaft seals and elastomers suitable for heated fuels like HFO, B designates an external grease-lubricated ball bearing, and P indicates an integral pressure relief valve adjustable up to the pump’s maximum operating pressure.

Can this G054 kit be used on a counter-clockwise (CCW) rotating pump?

Standard G054 kits are supplied with the G012 rotor set machined for standard clockwise (CW) rotation (viewed facing the drive shaft). If your pump nameplate specifies option code A101 (counter-clockwise rotation), you must order the G054 kit configured with the G011 CCW rotor set.