T6 engine swap CXH 2017 to 2020

[The Tango Van]

I’ve recently bought my first Transporter and quickly found myself waist deep in a project. The Transporter in question is a 2017 ex-RAC SWB T32 (with 2017 2.0 tdi CXH engine), which I bought from a car auction site as a non-runner; upon delivery I found several holes in the side of the block and sump.

I therefore needed to swap the engine and reviewing engine codes, thought I’d be able to do a straight swap for a replacement 2020 2.0 tdi CXH engine with just 30K miles. However, during the process I’ve found a few key differences and could do with some advice.

While most of the coolant pipes look similar, there seems to be some extra to the bottom right of the front of the engine; there’s a loop with a sensor (this looks like it has moved from a different location on the original engine, and additional pump which my wiring harness doesn’t have a plug for. Does anyone know if I need to remove these coolant lines and use originals or can I leave them in with the auxiliary pump simply unplugged?



I also found that the new 2020 engine intake manifold doesn’t have the motor or flaps, does anyone know if these are required; will it flag an issue if the motor which controls the flaps isn’t plugged in? Is it possible to program out the motor for controlling the intake flaps if it does flag an issue?



Any help or advice would be massively appreciated!

 

[mmi]

Well, there are three different hardware variants of CXH-engines - CXHA, CXHB, CXHC.
On top that in 2019 was introduced a change in emission control equipment - second NOx sensor, changes in AdBlue system, etc. which naturally brought different ECU softwares for each.
Sorry can't really help with the questions - just see challenges with the electrical differences as their correct operation are likely monitored.

 

[The Tango Van]

Thanks mmi, sounds like we made need to use the original engine harness; although we’ve not found any plugs that don’t match up yet other than the mentioned extra auxiliary coolant pump

 

[The Tango Van]

So the engine swap has been largely successful, I didn't realise that the original engine was an automatic specific engine CXHA; which apparently means there are some different dowels between engine and gearbox. This lead to shaft not fully aligning and the seals of the DSG clutch leaking.
After taking the van to a specialist, they advised on the issue and replaced the clutch . It's all running great otherwise

 

[Pedro]

So the engine swap has been largely successful, I didn't realise that the original engine was an automatic specific engine CXHA; which apparently means there are some different dowels between engine and gearbox. This lead to shaft not fully aligning and the seals of the DSG clutch leaking.
After taking the van to a specialist, they advised on the issue and replaced the clutch . It's all running great otherwise

Could you please let me know what specialist you took it to, as I have same issue, thanks

 

[The Tango Van]

I took it to RD Garage Services near Shepperton https://maps.app.goo.gl/EHLasG4x27dxsKP39?g_st=ic