Product Description
BA-921 CAT AIR COMPRESSOR & RE-PLUMB KIT – C11/C13/C15/C18 ENGINES
PART NUMBER(S):
Fleet Products: BA921C13K (New) | OE: EL365, 5012533X, 10R9375
DESCRIPTION:
Model: BA-921 Compressor with Re-plumb Kit
Vehicles: Caterpillar C11, C13, C15, C18 Engines
• Air Compressor Type: Single-cylinder, single-stage, flange-mount
• Air Inlet: Top (M27x2)
• Air Outlet: Side (M22x1.5)
• Cooling: Water-cooled head, air-cooled crankcase
• Drive: Engine-driven
• Bore: 3.622 in. (92 mm)
• Stroke: 2.126 in. (54 mm)
• Displacement: 15.8 CFM @ 1250 RPM
• Governor Port: M8x1.25 – includes air governor (PN: 284358-G)
• Water Port: M18x1.5
• Re-plumb Kit: Included (PN: 280-8823K)
• Material: Cast iron crankcase, aluminum head and plate
• Kit Weight: ~39 lbs (compressor only)
• Ports Markings: “0” (Air In), “2” (Discharge), “4” (Governor), “9” (Coolant In/Out)
Applications:
Complete retrofit kit designed to convert EL365 Midland compressors to BA-921 single-piston configuration on Caterpillar C-series diesel engines. Ideal for heavy-duty applications including Class 8 trucks, semis, 18-wheelers, vocational trucks, and fleet platforms originally fitted with EL365 units. Includes new compressor, replumb kit, and air governor for a full conversion.
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 dimensions match your application before installing.
IMPORTANT INSTALLATION NOTES:
✔ Use included air governor (284358-G) and replumb kit (280-8823K) for EL365 replacement
✔ Observe thread specifications:
• Inlet: M27x2 – Torque: 112–123 Nm
• Discharge: M22x1.5 – Torque: 92–103 Nm
• Water Port: M18x1.5 – Torque: 67–72 Nm
✔ Governor Cut-In: Minimum 100 PSI
✔ Governor Cut-Out: Minimum 120 PSI
✔ Use manufacturer torque specs for cylinder, crankcase, and port fasteners
✔ Replace all gaskets and confirm coolant circuit connections before road testing
SUPPORT & ORDERING
For technical support, installation guidance, or to confirm fitment, Call: 1-877-243-0442 | Email: sales@fleet-products.com
WHY CHOOSE FLEET PRODUCTS | KBR - HEAVY DUTY TRUCK & TRAILER PARTS?
- Canadian-owned and operated since 1985
- Trusted by fleets, mechanics, and B2B partners across North America
- Fast, reliable shipping across North America
- Competitive pricing with core return refunds
- Price Match Guarantee | Find a better price? Well beat the difference by 10%!
