CP4.2 Bypass kit

ShinerBock wrote:
Didn't say anyone was right or wrong. I was just guessing as to why Ford turned down so many people saying it was bad fuel because maybe they felt they took the necessary precautions by having a lift pump, a primary filter, and lower filter change intervals. GM on the other hand seemed to take no precautions by not having a lift pump, not having a primary filter, and extending the fuel filter change interval another 7.5k miles versus previous years. GM had to do something since they didn't provide any way to prevent the issue in the first place which is probably why the issue is more prevalent on the GM side.

Again, not saying they are right, just saying what they probably thought.

Ford has been applying Pavlovian training to their customer base for years with the 6.0, 6.4 and V10 that spit out spark plugs, so they knew that these same customers would buy into(AKA overlook) any issues with the 6.7.

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

Lantley wrote:
Ford turned down so many people because they took a bath on the 6.0 debacle.
They refused to run up another huge warranty tab!
The other guys had not just endured the 6.0 crisis and were more willing to do the right thing when it came to warranty

Most of the warranty for the 6.0L and 6.4L was on Navistar since it was their engine. Ford would pay the dealer and then file the warranty claim with Navistar to get reimbursed. Navistar started denying warranty from Ford and was one of many reasons why they parted ways with the 6.7L. They completely cut ties with the new F650/750 body styles that are no longer being built by Navistar.

Ford turned down so many people because they took a bath on the 6.0 debacle.
They refused to run up another huge warranty tab!
The other guys had not just endured the 6.0 crisis and were more willing to do the right thing when it came to warranty

Didn't say anyone was right or wrong. I was just guessing as to why Ford turned down so many people saying it was bad fuel because maybe they felt they took the necessary precautions by having a lift pump, a primary filter, and lower filter change intervals. GM on the other hand seemed to take no precautions by not having a lift pump, not having a primary filter, and extending the fuel filter change interval another 7.5k miles versus previous years. GM had to do something since they didn't provide any way to prevent the issue in the first place which is probably why the issue is more prevalent on the GM side.

Again, not saying they are right, just saying what they probably thought.

ShinerBock wrote:

The CP4 and CP3 were designed to run without a lift pump. That is also the reason why they don't make this mod for the LML Duramax since it doesn't have a lift pump and a filter to catch the metal particles if it explodes so it would be pointless. The design is simple, but requires a vehicle with a lift pump and preferably a primary filter.

Correct, that's what I was seeing. the blocker plate requires a lift pump.

Not liable because of bad fuel! The other manufacturers saw fit to stand behind their product.

A good company designs a product to be used in the environment used by their customers. I guess diesel got bad around the same time Ford spec'd the fuel pump and sold it to thousands of loyal ford fans.

Grit dog wrote:
So not real well read on high pressure pumps, but does this mod keep fuel flowing for lubrication everywhere it needs to?
Still seems to but it seems so simple that you wouldn’t inject your “oil” through your fuel injectors.
Looks like the original design can run without a lift pump but with the blocker plate you’d need the LP to feed the IP?

The CP4 and CP3 were designed to run without a lift pump. That is also the reason why they don't make this mod for the LML Duramax since it doesn't have a lift pump and a filter to catch the metal particles if it explodes so it would be pointless. The design is simple, but requires a vehicle with a lift pump and preferably a primary filter.

Bosch wanted to make these pumps for more applications which is why the original design is the way it is. What they didn't account for is how badly the pump grenades when it fails. I think GM is also partly to blame since they did not have a lift pump or primary filter and extended their filter change intervals to over 22k miles. They were just asking for trouble. Ford at least had these along with a shorter interval which is probably why they felt they were not liable since most issues were caused by bad fuel.

So not real well read on high pressure pumps, but does this mod keep fuel flowing for lubrication everywhere it needs to?
Still seems to but it seems so simple that you wouldn’t inject your “oil” through your fuel injectors.
Looks like the original design can run without a lift pump but with the blocker plate you’d need the LP to feed the IP?

ShinerBock wrote:

Halmfamily wrote:
So glad GM woke up and switched back to the CP3. If Ford would do this I might buy an F450.

GM did not go back to the CP3. They could make the power numbers they do and be emissions legal with a CP3. They went with a Denso HP4.

TRUE DAT!!!