World American WA914-02-1448 Air Compressor Cylinder Head Kit – Wabco SS318 Cummins

The World American WA914-02-1448 is a complete cylinder head kit designed to rebuild Wabco SS318 series air compressors with 85mm bore. This kit restores proper compression and air output on single-cylinder compressors commonly found on Cummins B, C, ISB, ISC, ISL, ISM, and N14 diesel engines. A cost-effective alternative to full compressor replacement when the lower end remains serviceable.

Signs You Need a New Cylinder Head Kit

• Slow air pressure build-up or failure to reach cut-out pressure
• Excessive oil passing through the compressor into the air system
• Air compressor head overheating or running hot
• Worn or damaged intake and discharge valves causing low output
• Blown head gasket with coolant or air leaks at the cylinder head
• Carbon buildup causing valve seating issues and reduced efficiency

Specifications

Kit Includes

• Assembled cylinder head with unloader assembly
• Intake and discharge valves
• Head gasket and seals
• Torque-to-yield mounting bolts

Cross References

This part replaces or is equivalent to the following part numbers:

• Wabco: 9111539202, 9111539202X, 9121406576
• Cummins: 4936226, 4936226NX, 4309439, 4309439RX, 4089207, 3800821
• Aftermarket: 700587AT

Compatible Compressors

This cylinder head kit fits Wabco SS318 series compressors including:

• Wabco 9111535200, 9111535200X
• Wabco 9111535300, 9111535300X
• Wabco 9111535330X, 9111535313X
• Cummins 3936810, 4936214, 3944524, 3966522
• Cummins 3944526, 3944525, 3558163

Applications

This cylinder head kit fits Wabco SS318 air compressors on Cummins-powered trucks including:

• Freightliner Cascadia, Columbia, Century, Coronado (Cummins ISX, ISM, ISL)
• Kenworth T680, T880, W900, T800, T600 (Cummins ISX, ISM, ISL, N14)
• Peterbilt 579, 389, 386, 387, 379, 378 (Cummins ISX, ISM, ISL, N14)
• International ProStar, LoneStar, 9900i (Cummins ISX)
• Volvo VNL, VNM (Cummins ISX)
• Western Star 4900, 5700 (Cummins ISX, ISM)
• Medium-duty trucks with Cummins ISB, ISC, ISL engines

Verify your compressor part number and bore size (85mm) before ordering to confirm fitment. This kit is not compatible with 75mm SS250 series compressors.

Handling Time
At All Pro Truck Parts we do our best to ship all orders the same day for orders placed before 12:00 PM Central Standard Time. Same-day shipment is never guaranteed. For standard UPS shipping, you will typically receive your package in 1 - 5 business days. Shipping times are never guaranteed and All Pro Truck Parts is not responsible for lost or delayed shipments by the carrier. Carrier times vary by distance from shipment origin and may change without prior notice. Shipping price is calculated from package dimensions and weight. Calculated rates for orders will be available at checkout. Orders placed after 12:00 PM CST on Fridays will not be fulfilled until the following business day, Monday morning barring a holiday.

Next Day Air Shipments
The cutoff time for UPS Next Day Air is 12:00 PM CST. Orders for Next Day Air placed after 12:00 PM CST will ship the following business day.

Incorrect Shipping Prices
All Pro Truck Parts reserves the right to cancel any order in the event shipping rates are calculated incorrectly at checkout. We will notify you at your provided contact information to give you the option to pay the correct amount, or allow you to cancel the order for a full refund.

Shipping Destinations
All Pro Truck Parts ships within the United States only. We do not currently offer international shipping.

Damaged Shipments
All Pro Truck Parts is not responsible for damage that occurs in transit - responsibility for damaged shipments lies with the carrier. However, we are glad to assist by filing a claim with the carrier on your behalf.

If your package arrives damaged, please do the following:

1. Refuse delivery if the package is visibly damaged at the time of arrival, and note the damage with the driver.
2. If the damage is discovered after delivery, photograph the outer packaging BEFORE opening the box, then photograph the contents showing the damage.
3. Keep all original packaging, including boxes, packing materials, and labels. Carriers may require an inspection before approving a claim.
4. Notify us within 48 hours of delivery by submitting a damaged shipment report at help.allprotruckparts.com/damaged-shipment.

Once a claim has been filed, resolution is determined by the carrier. Refunds and replacements for damaged shipments will only be issued after the carrier approves the claim. Failure to report damage within 48 hours, discarding the original packaging, or opening a visibly damaged package without photographing it first may result in the carrier denying the claim, in which case we are unable to refund or replace the item.

Shipping Services

• UPS Shipping Services
• UPS Ground
• UPS 2nd Day Air A.M. (commercial addresses only)
• UPS 2nd Day Air
• UPS 3 Day Select
• UPS Next Day Air Saver
• UPS Next Day Air
• UPS Next Day Air Early

Returns
All Pro Truck Parts offers lifetime returns for any reason on NEW, UNOPENED items in the original packaging with exceptions. (See sale items and special order items).
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Used items (if applicable)
Items marked as USED at the time of sale will be accepted for return up to 30 days from the date of sale. 

Defective items (if applicable)
Defective items under manufacturer warranty will be eligible for return, as well as a full refund for the total amount paid by the customer. The following criteria must be met to be eligible. (a). The part is under manufacturer warranty (b). the manufacturer has determined the part defective for the purchased application. 

Refunds (if applicable)
Once your item is returned and received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 7 business days. For order placed by phone through a card terminal, you must call in to initiate the refund. 

Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at sales@allprotruckparts.com.

Sale items (if applicable)
Only regular priced items may be refunded, unfortunately sale items cannot be refunded. 

Special Order Items (if applicable)
Special order items may be eligible for a refund. The decision to accept a special order item for refund is left solely to the All Pro Truck Parts management team. 

Exchanges (if applicable)
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at sales@allprotruckparts.com and send your item to: All Pro Truck Parts, 3948 Interstate 30 W, Caddo Mills TX 75135, United States.

Shipping
To return your product, you should mail your product to: All Pro Truck Parts, 3948 Interstate 30 W, Caddo Mills TX 75135, United States

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable.

Depending on where you live, the time it may take for your exchanged product to reach you, may vary.

If you are shipping an item over $75, it is advised that you use a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.
For returned items designated as "Free Shipping", any items shipped to the customer in which the customer did not pay shipping. All Pro Truck Parts will recover the cost of shipping to the customer's address from the refundable amount owed to the customer on the return and inspection of the item.