Clean CPU Block?

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Bought some second hand watercooling kit at the weekend. EKWB radiator, EKWB cpu block, EKWB pump all pre looped in a case.

Gave it a leak test and the old faint heart never ****** a pig moved my kit over and its working fine but temps not great. As its been running for a few days now confident everything is ok so was going to drain / refill and clean out the CPU block. Problem is I have no idea what model it is. From work experience I would never normally take something appart like this without a seal kit but is it usually needed on CPU blocks?

 

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not saying it is causing temperature issues. Just as kit second hand no idea how well been maintained so thought prudent to open it up and nake sure

 

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Just done it and made a massive difference.

A quick Prime95 torture was hitting 80. Now 62.

 

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Somewhere that specialise in hydraulics and bearings will have a ring you suit your block.

I find this hard to believe.... When i cleaned my block it was not a ring.

If a ring yeah sure find something that will fit but not a wierd polygon shape