Description
9111539212AH – WABCO HEAD
PART NUMBER(S):
Fleet Products: 9111539212AH, S-21432, 250310, 250322, 503324, Cummins: 4309440, 4936225, 250310, 250322, 4936225CUM, CW.210.1000
DESCRIPTION:
Model: WABCO SS318
Vehicles: Suitable for heavy-duty trucks with Cummins ISX, ISC, B & C Series, Mack E-Tech, and Volvo engines
• Bore Size: 85 mm
• Water Port: M18–1.5 STOR (Straight Thread O-Ring) Intake port: Ø 20.5 mm, No threads
• Discharge Port: M27–2.0 STOR
• Governor Port: M10–1.0 STOR
• Air Flow: 18.7 CFM
• Weight: 2.785 kg (6.14 lbs)
• Material: OEM-grade, heavy-duty
• Function: Cylinder head for WABCO SS318 single-cylinder air compressor
• System Compatibility: Direct fit for WABCO SS318 units on Cummins, Mack, and Volvo engine platforms
• Included Components: Fully assembled head with unloader assembly, all valves, gaskets, torque-to-yield bolts
• Performance/Technology: Engineered for high air flow and precise fitment in demanding commercial applications
• Sold As: New, OEM-grade, ready to install
Applications:
Designed for WABCO SS318 air compressors used in heavy-duty powertrain configurations, including Cummins ISX, ISC, B & C Series, Mack E-Tech, and Volvo engines. Direct fitment for compressor models 9111535100X, 3681904, 3681902, 3104216, 9121406576, 9111535100X, 9111530197X, 9111530270X
CROSS-REFERENCE(S):
4089206, 9111539212, 9111 539 21 2, 3104216RX, 3681902, 9111539202, 9111535200X, 9111535300X, 9111535313X, 9111535330X, 9111530040X, 9111535337X, 9111535307X, 3936810, 4936214, 3944524, 3966522, 3944526, 3944525, 3558163, 9111535100X, 3681904, 3104216A cross-reference listing means this part may be a compatible replacement for these part numbers based on OEM or distributor data.
IMPORTANT INSTALLATION NOTES:
✔ Clean all mating surfaces thoroughly prior to installation
✔ Use new gaskets and seals included with the assembly
✔ Lubricate sliding leaf and inlet valves before installation
✔ Align head pins and torque bolts in sequence:
• Initial torque: 18.5 ± 2.5 lb-ft (25 ± 3.4 Nm)
• Final step: Rotate bolts 90° + 15° ± 5° (torque-to-yield method)
✔ Flip head upside down for pre-assembly, then mount to crankcase per manufacturer sequence
✔ Confirm port threading for proper line connections: Water (M18–1.5 STOR), Discharge (M27–2.0 STOR), Governor (M10–1.0 STOR)
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