Product Description
BA-921 CAT COMPRESSOR & RE-PLUMB KIT – C15 ENGINE CONVERSION
PART NUMBER(S):
Fleet Products: BA921C15K (New) | OE: EL365, 5012533X, 10R9375
DESCRIPTION:
Model: BA-921 Conversion Kit for CAT C15
Vehicles: Caterpillar C15/C13/C11/C18 Engines (Heavy-Duty Trucks, Semis, Commercial Fleets)
• Compressor Type: Single-cylinder, reciprocating, flange-mount
• Air Inlet: Top (M27x2)
• Discharge Port: Side (M22x1.5)
• Water Ports: M18x1.5 – Coolant In/Out
• Cooling: Water-cooled head, air-cooled crankcase
• Bore: 3.622 in. (92 mm)
• Stroke: 2.126 in. (54 mm)
• Displacement: 15.8 CFM at 1250 RPM
• Ports Markings: “0” (Air In), “2” (Discharge), “9” (Coolant), “4” (Governor)
• Kit Includes:
– BA-921 Compressor (New, PN: 5012533N)
– Re-plumb Kit (PN: 285-8823K – with elbow included)
– Air Governor (PN: 284358-G)
• Material: Aluminum head, cast iron crankcase
• Weight: ~48–66 lbs (depends on spec/supplier)
• Compressor Purpose: Replace EL365 for Caterpillar platform with BA-921 via direct-fit conversion
Applications:
Designed to retrofit EL365 air compressors on Caterpillar C15 engines using the proven BA-921 unit. Supplied as a complete kit including new compressor, governor, and elbow-equipped replumb kit for single-cylinder conversion. Ideal for heavy-duty long-haul, construction, and commercial fleet platforms where robust air brake performance is essential.
CROSS-REFERENCE(S):
EL365, 365132, 365152, KN365152, EL365152, 5012533X, 5012533, 10R9375, 5011427, 801463, 5012532, 5012531, K020284, K048943, K066838, OR1624, R9555012533X, 20R0178, 20R0176, 223-3637, MIDLAND CAT COMPRESSOR
A cross-reference listing means this part should be a suitable replacement for the part numbers listed. Please confirm all ports and dimensions match your application before installing.
IMPORTANT INSTALLATION NOTES:
✔ Elbow-equipped replumb kit (285-8823K) simplifies retrofit from EL365
✔ Use included air governor (284358-G); set cut-in ≥100 PSI, cut-out ≥120 PSI
✔ Observe correct torque values per Bendix spec:
• Inlet Port (M27x2): 112–123 Nm
• Discharge Port (M22x1.5): 92–103 Nm
• Water Port (M18x1.5): 67–72 Nm
✔ Ensure coolant lines and governor control match OEM routing
✔ Mounting seal not included – use high-temp rated gasket per vehicle spec
✔ Double-check elbow clearance for CAT C15 engine bay configuration
SUPPORT & ORDERING
For technical support, installation guidance, or to confirm fitment, Call: 1-877-243-0442 | Email: sales@fleet-products.com
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