Description
Genuine Detroit Diesel OEM valve cover isolator bushing (08929255) for Series 60 engines. The rubber isolator mounts beneath each rocker cover bolt to dampen engine vibration and maintain proper clamping force on the cover gasket. Worn or compressed isolators are one of the most common sources of valve cover oil leaks on the Series 60.
Signs You Need New Valve Cover Isolators
- Oil leaking from under the valve cover gasket
- Visible cracks, hardening, or compression of the rubber bushing
- Recurring valve cover gasket failures despite a new gasket
- Oil residue around the valve cover mounting bolts
Specifications
| Manufacturer | Detroit Diesel |
|---|---|
| Part Number | 08929255 (also 8929255) |
| Part Type | Valve Cover Isolator Bushing |
| Engine Compatibility | Detroit Diesel Series 60 (11.1L, 12.7L, 14L) |
| Dimensions | 43.25 mm OD x 39.5 mm height |
| Material | Rubber / elastomer |
| Condition | New — Genuine OEM |
Cross References
This part replaces or is equivalent to the following part numbers:
- Detroit Diesel: 08929255, 8929255
- PAI Industries: A-8929255
- Interstate-McBee: A-8929255
- FP Diesel: FP-8929255
Applications
This valve cover isolator fits the following engines:
- Detroit Series 60 11.1L (1987–1998)
- Detroit Series 60 12.7L (1987–2007)
- Detroit Series 60 14.0L (2001–2007)
Representative vehicles using these engines:
- Freightliner Century Class, Columbia, Classic, FLD
- Kenworth T600, T800, W900
- Peterbilt 379, 385, 386, 387
- Western Star 4900
Verify your engine serial number and valve cover configuration before ordering — Detroit released revised isolator assemblies (23517911 for 1996–1999, 23522271 for June 1999 and later) for some valve cover designs.
