- April 3, 2009
- Reaction score
- City, State
- Kailua-Oahu, Hawaii
- Year, Model & Trim Level
- '05 Sport Trac XLS (RWD)
Novice question. Must be a reason an aftermarket manufacturer hasn't made them. "If" the engine wasn't destroyed when the plastic tensioner guide(s) failed, seems like it would be a very lucrative business for those choosing to rebuild rather than replace their engine.
In my opinion the main deficiency with the Ford SOHC V6 4.0L design is not the use of plastic tensioner to chain wear surfaces but the use of plastic as a structural element. Due to heat cycles and mechanical stress cycles the plastic eventually fractures and then breaks. The cassette guide assemblies should have been built of metal with plastic only used for chain to guide wear surfaces.
why the plastic guides on timing chain? | Ford Explorer and Ford Ranger Forums - Serious Explorations