CP4.2 Bypass kit
Found this interesting for all you Powerstroke guys. While it will not keep the first version(2011-2014) of the CP4.2 from failing, it will keep it from taking down the rest of the fuel system with i...
Forum Discussion
Still a band aide..root cause is the design/architecture of the CP4 series pump
Using diesel as the only lube the main or #1 issue
Other is allowing the high pressure piston to NOT be positively fastened to the cam follower (tappet with a roller). This allowed the piston to float...leaving space between its bottom and the cam follower (tappet), which got hammered over time...that then had metal particles float around till it got to the cam surface and the tappet roller came along to pit the surface till grenade'd the works
Bosch's many band aids included the plating of DLC (Diamond like coating) to the cam. Diamond is NOT a good choice (brittle) and assume 'like' has some sort of alloying to toughening it, but Diamond is also the best non-stick elements out there, so question the film strength of diesel maintaining a good film on the cam surface for the tappet roller to ride on. Better to have plated it with Molybdenum Disulfide or Tungsten Disulfide or not need a coating at all with the below closed crank case
Best would have been to remove the diesel lube altogether and have a closed 'crank case' filled with a proper/better lube...like synthetic oil. To have the fuel (diesel) only plumbed from the filters (water and particulate) to the intake side of the CP4 series
Other weakness in design was using a series stack of silicone chips (piezo) in the injector, but that has been resolved to my understanding
Using diesel as the only lube the main or #1 issue
Other is allowing the high pressure piston to NOT be positively fastened to the cam follower (tappet with a roller). This allowed the piston to float...leaving space between its bottom and the cam follower (tappet), which got hammered over time...that then had metal particles float around till it got to the cam surface and the tappet roller came along to pit the surface till grenade'd the works
Bosch's many band aids included the plating of DLC (Diamond like coating) to the cam. Diamond is NOT a good choice (brittle) and assume 'like' has some sort of alloying to toughening it, but Diamond is also the best non-stick elements out there, so question the film strength of diesel maintaining a good film on the cam surface for the tappet roller to ride on. Better to have plated it with Molybdenum Disulfide or Tungsten Disulfide or not need a coating at all with the below closed crank case
Best would have been to remove the diesel lube altogether and have a closed 'crank case' filled with a proper/better lube...like synthetic oil. To have the fuel (diesel) only plumbed from the filters (water and particulate) to the intake side of the CP4 series
Other weakness in design was using a series stack of silicone chips (piezo) in the injector, but that has been resolved to my understanding
