wildebill308 Report post Posted March 12, 2016 I haven't been able to find out specific details on how the ISX650 fails. Dropping a valve is generic. I am interested in what specifically failed. Did the keepers shear or the rings on the valve fail or valve head separate all or partial? Inquiring minds want to know. Bill Share this post Link to post Share on other sites
dorgene Report post Posted March 14, 2016 Kent, The 2007 Country Coach you are looking at - does it have a 2006 engine? If so, it will not have a DPF (Diesel Particulate Filter). 2007 engines required a DPF. Note: This applies to the model year of the engine, not the model year of the chassis or coach body. In my view, an engine without a DPF is more desireable. Share this post Link to post Share on other sites
