Description
PAI 636031 is the aftermarket rear crankshaft seal (rear main seal) for Detroit Diesel DD13 and DD15 and Mercedes-Benz MBE 4000 engines, replacing Detroit OEM A0259975047 / 0259975047 and A0219975347 / 0219975347. 4.500″ ID x 5.528″ OD x 0.478″ wide (114.30 x 140.41 x 12.14 mm). Press-fits into the rear cover at the flywheel end of the crankshaft to seal engine oil at the rear main bearing.
Signs You Need a New Rear Crankshaft Seal
- Engine oil drip or wet streak between the engine and transmission bell housing
- Oil-soaked clutch or torque converter housing pulled at PM
- Oil consumption with no visible front, valve cover, or pan leak source
- Oil mist or smoke from the bell housing area on a hot engine
- Damp or oil-soaked flywheel face during a clutch job
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | 636031 |
| Replaces (OEM) | Detroit Diesel A0259975047 / 0259975047 |
| Part Type | Rear Crankshaft Seal (Rear Main Seal) |
| Engine Compatibility | Detroit DD13, DD15; Mercedes-Benz MBE 4000 |
| Inside Diameter | 4.500 in (114.30 mm) |
| Outside Diameter | 5.528 in (140.41 mm) |
| Width | 0.478 in (12.14 mm) |
| Position | Flywheel end of crankshaft |
Cross References
This rear crankshaft seal replaces or is equivalent to the following part numbers:
- Detroit Diesel: A0259975047, 0259975047, A0219975347, 0219975347
- PAI Industries: 636031
Applications
This rear crankshaft seal fits the following engines:
- Detroit DD13 12.8L (2008–present)
- Detroit DD15 14.8L (2008–present)
- Mercedes-Benz MBE 4000 12.8L (2002–2010)
Representative vehicles using these engines:
- Freightliner Cascadia, Columbia, Coronado, Century (DD13/DD15)
- Western Star 4900, 5700, 5800 (DD13/DD15)
- Sterling AT9500 / LT9500 with MBE 4000
Verify the seal bore and crankshaft sealing surface for scoring or wear before installing — a damaged crank surface will eat the new seal. Detroit recommends the J-47388-A (or equivalent) installer to seat the seal squarely.
