Worcester Bosch right hand block change

DISCLAIMER:
This video is only intended for use by qualified Gas Safe Registered engineers. You must not attempt any work on your boiler if you are not qualified. You must always carry out 26.9 checks upon completion of works on a boiler.
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Here's how to change a right hand block on a Worcester, also known as the return unit.
Soak all connections in WD-40 for a few mins beforehand and use plenty of silicone grease on the new parts.
The block had split on the cold mains side so needed replacing. When replacing the right hand block I always replace the flow turbine adaptor because it always breaks when you remove it and the PRV as well whilst I'm at it. The new block comes with a new diverter built in so you don't need to replace that.
A lot of people struggle with the bypass, but if you see in the video, I wiggled it out of the left hand block by removing the gas pipe connection so it gave me more room to manoeuvre it out.
Part numbers given below:
Right hand block 87161064420
Flow turbine adapter 87161064330
PRV 87161064310