PAI 631265 | Detroit DD15 Cylinder Head Gasket

PAI 631265 Detroit DD15 Cylinder Head Gasket

The PAI 631265 Cylinder Head Gasket is a replacement head gasket designed for Detroit Diesel DD15 engines. This gasket seals the cylinder head to the engine block to help maintain proper compression while preventing the mixing or leakage of engine oil, coolant, and combustion gases.

PAI 631265 replaces Detroit Diesel OEM A4720161820 and is also cross-referenced to A4720162220. It is used as the head gasket component in the PAI 631375 DD15 head gasket set.

PAI 631265 Head Gasket Specifications

• Brand: PAI Industries
• PAI Part Number: 631265
• Product Type: Cylinder Head Gasket
• Engine Application: Detroit Diesel DD15
• OEM Reference: A4720161820
• Additional OEM Reference: A4720162220
• Condition: New
• Application: Heavy-Duty Diesel Engine

OEM & Cross Reference Numbers

PAI 631265 is cross-referenced to the following Detroit Diesel and aftermarket numbers:

• Detroit Diesel: A4720161820
• Detroit Diesel: A4720162220
• Detroit Diesel: A4720161520
• Interstate-McBee: A-A4720161520
• Interstate-McBee: A-A4720161820
• Interstate-McBee: A-A4720162220
• PAI: 631265E

Cross-reference numbers are provided for identification and compatibility purposes. Always verify the exact OEM part number and engine configuration before ordering.

Detroit DD15 Head Gasket Replacement

The cylinder head gasket is a critical sealing component between the DD15 cylinder head and engine block. It must maintain sealing around the combustion chambers, coolant passages, and oil passages while withstanding the heat and pressure generated by the engine.

A compromised head gasket can contribute to coolant loss, oil and coolant contamination, combustion-gas leakage, loss of compression, or other engine performance problems. Replacing the gasket requires proper cylinder-head inspection, surface preparation, torque procedures, and installation according to applicable Detroit service specifications.

PAI 631265 vs. DD15 Head Gasket Set

PAI 631265 is the individual cylinder head gasket. It is also included as a component of the PAI 631375 DD15 head gasket set, which includes additional gaskets and components required for a more complete upper-engine repair.

If you are performing a complete DD15 head-gasket repair or engine rebuild, verify whether you need the individual 631265 head gasket or the complete 631375 head gasket set.

DD15 Fitment Verification

Important: Detroit DD15 engines use multiple head-gasket and gasket-set configurations. Verify the OEM part number, VIN, and/or engine serial number (ESN) before ordering.

PAI 631265 is specifically cross-referenced to Detroit Diesel A4720161820 and A4720162220. Do not assume that every DD15 engine uses the same head gasket without confirming the engine configuration.

PAI 631265 Warranty

PAI lists the standard Genuine PAI version with a 2-year unlimited-mileage warranty. The related 631265E Excel by PAI version carries different warranty coverage, so verify the exact PAI part suffix when ordering.