Heatline C28 plate heat exchanger washers?

[scooteruk]

I have a heatline C28 combi boiler which had a blocked plate heat exchanger. I cleaned it quite well but my mistake is that I tapped the front face quite a few times and therefore now when I tighten it with the riveter valve, some water leaks. In the original C28 design, there are no washers that sit between diverted valve and plate heat exchanger. I am wondering if I am able to use any washers as seal to stop water leaking. Would normal rubber washers work or are there any washers available that can be used between diverted valve and plate heat exchanger?
Any advice would be really appreciated.
Regards
Scoot

 

[Slugbabydotcom]

I think you will find that there are indeed washers there, but they are facing away from you on the back of the hydroblocks. Ideally they should be renewed but its possible to get away with making sure they are clean and a smear of silicone grease helps to hold them in place and improves the seal.

 

[scooteruk]

Hi, thanks for your reply. I am sure there are no washers in the original C 28 as I opened and cleaned it once before couple of years ago.

What I am really interested in is to know what type of washer I should use there, synthetic rubber, fibre or anything else. If someone can suggest the right kind of washer, then that would be great.
Regards

 

[Tibbot]

You need the correct makers washers, usually an o-ring. If you have damaged the heat exchanger ports then you should fit a new part. These are machined together with the hydroblock in a bespoke way. Lining up and not having to over-tighten the retaining screws for correct sealing depend on this. It's not advisable to bodge the repair.

 

[bazdaman]

You have been told there are washers facing away in the hydroblock, they like to be called lip seals and are readily available at merchants go in tell them what boiler u have.
You can see a pic of them here

http://www.gas-spares.co.uk/Catalog...TLINE-Original-spares-HE/HEAT-EXCHANGER-DHW-2