Bosch CP4 Roller Rocker Arm

Good evening.

There are now many reports of CP4 pump failures, where the roller plunger rotates 90 degrees, contaminating the entire system with debris.

Does anyone know if any modifications or improvements were made to this pump during its construction period?

If so, I would proactively replace them as a precaution when the mileage reaches 210,000 km.

Regards,
Malte.

Hello,

In which engines is the CP4 actually installed?

Best regards, Rainer.

"In virtually all VW CR-TDI engines that use Bosch components."
Okay, so it's the 2.0 4-cylinder CR engine, generation 1 and 2.
I think some older V6 engines might have CP3 injectors.

Hello,

These are all the cross-referenced part numbers from Audi, VW, Seat, and Skoda.

03L130755L 03L130755 03L130755A
03L130755AA 03L130755AC 03L130755AF
03L130755D 03L130755M 03L130851AX
03L130851BX 03L130851HX 03L130851X
0445010526, 0986437405, 0445010507,
0445010508, 0445010514, 0445010529,
0445010532, 0445010533, 0445010534,
0445010551, 0445010560, 0445010565
0445010566, 0445010567, 0986437410,
0986437411, 0986437412, 0986437419,
0986437420, 0445010526, 0986437405,
0445010507, 0445010508, 0445010514,
0445010529, 0445010533, 0445010534,
0445010567, 0986437410, 0986437420,
0986437419, 0986437411, 0986437412,
0445010514, , 0445010529, 0445010532,
0445010533, 0445010534, 0445010551,
0445010560, 0445010565, 0445010566,
0445010567

Installed in all 2.0 CR-TDI engines with 85, 109, 110, 136, 140, 143, 163, 170, 177, and 180 horsepower.

used without modification, from 2009 to 2016.

Regards, Mpire.

Quote:

used without revision from 2009 to 2016

Okay, so if I order one now with the same part number (VAG/Bosch?), as the one I installed, will I get an improved version?

Regards,
Malte.

Malte1408 wrote:

Quote: without revisions, used from 2009 to 2016 Okay, so if I order one now with the same part number (VAG/Bosch?), as the one I installed, will I get an improved version? Regards, Malte

Hello.

I can't tell you that. You should probably contact Bosch customer service for information; they're likely to have the most up-to-date details.
Within the VAG area, I have experienced quite a bit regarding inventory levels, warehouse and data management, and the timeliness of information, and not always in a positive way .
The manufacturer is probably the best person to tell you whether the version produced after 2016 is compatible.
I have personally never encountered a vehicle with a damaged piston or any similar type of damage.

However, regarding the mileage:
Habe einige Fahrzeuge in "Pflege", die weit mehr als die 200k runter haben. Beim Filterwechsel achte ich immer auf Indizien für Schäden. BNot yet.
Those who run, actually do.
"I've also had similar issues with debris in the filter, all with mileage under 100,000 km. One had a 2.0L engine with 143 hp, but three had 1.6L engines with 105/110 hp. In none of them was the valve lifter twisted after opening."
Everyone had previously (for 6-8 weeks) been using the same service provider for maintenance, including filter changes.
Let he who thinks evil of it be ashamed.

- Good, and above all, clean brand-name fuel (not all gas station operators keep their fuel systems as clean as they should).
- Install high-quality brand-name fuel filters, and potentially replace them more frequently (every 30,000 to 50,000 km) than the recommended interval .
- When replacing the filter, pay the utmost attention to cleanliness; ensure no particles from the box or lint from the cloth get into the system.
- However, the most important thing is to properly bleed the system (using VCDS) BEFORE the first engine start after the filter change:
Disconnect the feed line from the filter to the CR pump, place it in a container, and use VCDS to pump the fluid through until no more air bubbles appear, then reconnect it.

You can forget about the "10x ignition" trick. It doesn't work on all models.
"With the MSTG (Multi-Stage Injection System) on 1.6 CR-TDI engines, nothing works, and some 2.0 engines have the same issue, where the fuel pump is only activated when the starter motor is engaged."
My experience shows that even a small amount of dirt and air movement in the system after a filter change can be enough to unleash a cascade of problems, like introducing debris into the system.
We were only able to salvage one 1.6-liter engine; the other three were essentially economic scrap. The chips were everywhere .

Regards, Mpire.