Description
LP3997X – BA-921 SIDE MOUNT COMPRESSOR
PART NUMBER(S):
Fleet Products: LP3997X (Remanufactured) | OE: K012223, K010313, 501245R1, 3012368, K075155, K042162, Navistar 3709920C92, K044642R, 702020AT, K075155, LP3997, 51541007095, K015948, 51541007121, K025822N00, 51.54100-7121, 51.54100-7114, K044642, K042162, 3709920C92, 3709920C93, 3709920C94, 3709920C95
DESCRIPTION:
Model: BA-921 Side Mount Compressor
Vehicles: Pre-2010 MaxxForce Engines (G11/G13) 2010-MaxxForce 11/13L
• Mounting Type: Side Mount (Engine Block Face)
• Cooling: Water Cooled Cylinder Head, Air Cooled Crankcase
- Cylinders: 1
- Bore x Stroke: 3.622 in x 2.126 in
- Displacement @1250 RPM: 15.8 CFM
- Flow @1800 RPM /120 PSI: 11.6 CFM
- Flow @3000 RPM /120 PSI: 16.5 CFM
- HP @1800 RPM /120 PSIG: 4.6 HP (loaded) / 0.8 HP (unloaded)
- Min Coolant Flow @Max RPM: 1.5 gpm
- Oil Pressure (min): 15 PSI
- Governor Cut-Out (min): 120 PSI
- Unloader Line: 3/16 in ID
- Temp Range: 170°F inlet / 400°F discharge
Port Sizes & Required Torque
- Cylinder Head (M8): 265–292 in-lb
- Governor Adapter (M8): 195–213 in-lb
- Rear End Cover (M10): 195–213 in-lb
- Inlet Port Fitting (M27x2): 991–1089 in-lb
- Discharge Port Fitting (M22x1.5): 814–912 in-lb
- Water Port Fitting (M18x1.5): 593–637 in-lb
- Oil Port (7/16-16 UNF): 150–170 in-lb
- Unloader Port (1/8-27 NPT): 2–3 turns from finger tight
Applications:
The LP3997X – BA-921 Side Mount Compressor is engineered for air brake systems in heavy-duty vehicles such as semi-trucks, 18-wheelers, and commercial trucks. Specifically designed for Navistar, Caterpillar, and International MaxxForce engines, it ensures reliable air pressurization for brake actuation. It features a side mount configuration, water-cooled cylinder head, and special crankcase for ETECH block clearance.
CROSS-REFERENCE(S):
K044642R, 702020AT, 501245R1, 3012368
A cross-reference listing means this part is a suitable replacement for the part numbers listed. Please confirm all ports and dimensions match your application before installing.
IMPORTANT INSTALLATION NOTES:
- Maintain minimum 1.5 gpm coolant flow.
- Ensure external oil supply line is connected for single piston applications.
- Verify air and coolant fittings are properly sealed before startup.
- Drain air reservoirs before servicing air brake components.
- Verify all fasteners are torqued to specification before returning vehicle to service.
SOLD AS REMANUFACTURED | CORE RETURN REQUIRED
Built to OEM standards | thoroughly cleaned, inspected, and tested to ensure durability, performance, and reliability in demanding applications.
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Warranty Information
