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
DESCRIPTION:
Model: BA-921 Side Mount Compressor
Vehicles: Heavy trucks, semi trucks, 18 wheelers, commercial trucks, Navistar, Caterpillar, International MaxxForce
• Mounting Type: Side Mount (Engine Block Face)
• Cooling: Water Cooled Cylinder Head, Air Cooled Crankcase
• Cylinder: Single
• Piston Diameter: 3.622 in. (92 mm)
• Stroke: 2.126 in. (54 mm)
• Rated Displacement: 15.8 CFM @ 1250 RPM
• Flow @ 1800 RPM & 120 PSI: 11.6 CFM
• Flow @ 3000 RPM & 120 PSI: 16.5 CFM
• Air Inlet Port: 1 3/16"-12 UN-2B (Aluminum Head) / M27x2-6g (Cast Iron Head)
• Air Delivery Port: 7/8"-14 UNF-2B (Aluminum Head) / M22x1.5-6g (Cast Iron Head)
• Water Port: 3/4"-16 UNF-2B (Aluminum Head) / M18x1.5-6g (Cast Iron Head)
• Unloader Port: 1/8" NPTF
• Minimum Coolant Flow: 1.5 gal/min (max RPM)
• Maximum Inlet Air Temperature: 170°F (Standard), 250°F (Closed Room Version)
• Maximum Discharge Air Temperature: 400°F
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:
✔ Built to OEM standards, thoroughly cleaned, inspected, and tested for durability and reliability.
✔ Core return required for remanufactured units.
✔ Install according to specified mounting, air inlet, and outlet configurations.
✔ Torque the cylinder head, unloader cap, governor adapter, and other fittings to the specified values (refer to service data for torque values).
✔ For installation guidance or fitment confirmation, call Fleet Products technical support at .
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
