Description
The PAI 131655 is a premium aftermarket gear housing gasket (also known as front timing cover gasket) for Cummins ISX, ISX15, QSX, and X15 heavy-duty diesel engines. This gasket seals the front gear housing cover to the engine block, preventing oil leaks from the timing gear train area. Manufactured by PAI Industries to meet or exceed OEM specifications, this gasket provides a reliable seal to maintain proper lubrication and protect critical engine components.
Signs You Need a New Gear Housing Gasket
- Oil leak from front of engine near timing cover area
- Visible oil seepage around gear housing perimeter
- Oil dripping onto serpentine belt or accessories
- Low oil level with no other visible external leaks
- Oil residue or buildup on front engine components
- Failed emissions inspection due to oil contamination
- Gasket replacement required during front seal or gear train service
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | 131655 |
| Part Type | Gear Housing Gasket (Front Timing Cover Gasket) |
| Engine Application | Cummins ISX, ISX15, QSX, X15 |
| Used With | PAI 060080 Gear Housing |
| Weight | 1.18-1.20 lbs |
| Dimensions | 24 in x 19 in x 1 in |
| Warranty | 2 Years / Unlimited Mileage (Genuine PAI) |
Cross References
This gasket replaces or is equivalent to the following part numbers:
- Cummins: 3680876, 3681145, 4026694, 4089757, 4101883, 4985562
- Interstate McBee: M-4026694, M-4089757, M-4985562
- PAI: 131655
Engine Applications
This gear housing gasket fits the following Cummins engine models:
- Cummins ISX – All 11.9L and 15.0L variants (1997-2016)
- Cummins ISX15 – 14.9L (2010+)
- Cummins QSX15 – Industrial/Off-Highway applications
- Cummins X15 – EPA 2017+ (CM2350/CM2450)
Vehicle Applications
Cummins ISX/ISX15/X15 engines are found in Class 8 trucks from major manufacturers:
- Freightliner: Cascadia, Coronado, 122SD, 114SD (2001+)
- Kenworth: W900, W990, T880, T680, T800, C500 (2001+)
- Peterbilt: 389, 579, 567, 386, 387, 388, 367, 365 (2001+)
- International: LT, HX, LoneStar, ProStar, 9900i (2001+)
- Western Star: 4900, 5700XE (2001+)
- Volvo: VNL, VNX Series (with Cummins ISX option)
- Mack: Pinnacle, Anthem (with Cummins ISX option)
When to Replace
The gear housing gasket should be inspected and typically replaced when performing major front-of-engine service including front crankshaft seal replacement, timing gear service, accessory drive repair, or any time the gear housing cover is removed. Oil leaks from this area can contaminate the serpentine belt and accessories, potentially causing belt slip or premature failure. Early detection and replacement of a failing gasket prevents more extensive repairs and maintains proper engine oil levels.
Installation Notes
Thoroughly clean both the gear housing cover and engine block mating surfaces before installation. Remove all old gasket material and debris. Inspect the gear housing cover for warping or damage. Install the gasket dry (no sealant required on gasket surfaces). Apply RTV sealant only at corners where the oil pan meets the block per Cummins service recommendations. Torque gear housing bolts to Cummins specifications in the proper sequence.
Verify your engine serial number and CPL/CM code before ordering to confirm fitment for your specific ISX/X15 configuration.
